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2099 lines
77 KiB
2099 lines
77 KiB
/*-------------------------------------------------------------------------
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Arduino library to control a wide variety of WS2811- and WS2812-based RGB
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LED devices such as Adafruit FLORA RGB Smart Pixels and NeoPixel strips.
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Currently handles 400 and 800 KHz bitstreams on 8, 12 and 16 MHz ATmega
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MCUs, with LEDs wired for various color orders. Handles most output pins
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(possible exception with upper PORT registers on the Arduino Mega).
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Written by Phil Burgess / Paint Your Dragon for Adafruit Industries,
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contributions by PJRC, Michael Miller and other members of the open
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source community.
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Adafruit invests time and resources providing this open source code,
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please support Adafruit and open-source hardware by purchasing products
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from Adafruit!
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-------------------------------------------------------------------------
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This file is part of the Adafruit NeoPixel library.
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NeoPixel is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation, either version 3 of
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the License, or (at your option) any later version.
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NeoPixel is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with NeoPixel. If not, see
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<http://www.gnu.org/licenses/>.
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-------------------------------------------------------------------------*/
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#include "Adafruit_NeoPixel.h"
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#if defined(NRF52)
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#include "nrf.h"
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// Interrupt is only disabled if there is no PWM device available
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// Note: Adafruit Bluefruit nrf52 does not use this option
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//#define NRF52_DISABLE_INT
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#endif
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// Constructor when length, pin and type are known at compile-time:
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Adafruit_NeoPixel::Adafruit_NeoPixel(uint16_t n, uint8_t p, neoPixelType t) :
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begun(false), brightness(0), pixels(NULL), endTime(0)
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{
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updateType(t);
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updateLength(n);
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setPin(p);
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}
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// via Michael Vogt/neophob: empty constructor is used when strand length
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// isn't known at compile-time; situations where program config might be
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// read from internal flash memory or an SD card, or arrive via serial
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// command. If using this constructor, MUST follow up with updateType(),
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// updateLength(), etc. to establish the strand type, length and pin number!
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Adafruit_NeoPixel::Adafruit_NeoPixel() :
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#ifdef NEO_KHZ400
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is800KHz(true),
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#endif
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begun(false), numLEDs(0), numBytes(0), pin(-1), brightness(0), pixels(NULL),
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rOffset(1), gOffset(0), bOffset(2), wOffset(1), endTime(0)
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{
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}
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Adafruit_NeoPixel::~Adafruit_NeoPixel() {
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if(pixels) free(pixels);
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if(pin >= 0) pinMode(pin, INPUT);
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}
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void Adafruit_NeoPixel::begin(void) {
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if(pin >= 0) {
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pinMode(pin, OUTPUT);
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digitalWrite(pin, LOW);
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}
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begun = true;
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}
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void Adafruit_NeoPixel::updateLength(uint16_t n) {
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if(pixels) free(pixels); // Free existing data (if any)
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// Allocate new data -- note: ALL PIXELS ARE CLEARED
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numBytes = n * ((wOffset == rOffset) ? 3 : 4);
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if((pixels = (uint8_t *)malloc(numBytes))) {
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memset(pixels, 0, numBytes);
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numLEDs = n;
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} else {
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numLEDs = numBytes = 0;
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}
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}
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void Adafruit_NeoPixel::updateType(neoPixelType t) {
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boolean oldThreeBytesPerPixel = (wOffset == rOffset); // false if RGBW
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wOffset = (t >> 6) & 0b11; // See notes in header file
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rOffset = (t >> 4) & 0b11; // regarding R/G/B/W offsets
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gOffset = (t >> 2) & 0b11;
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bOffset = t & 0b11;
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#ifdef NEO_KHZ400
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is800KHz = (t < 256); // 400 KHz flag is 1<<8
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#endif
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// If bytes-per-pixel has changed (and pixel data was previously
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// allocated), re-allocate to new size. Will clear any data.
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if(pixels) {
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boolean newThreeBytesPerPixel = (wOffset == rOffset);
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if(newThreeBytesPerPixel != oldThreeBytesPerPixel) updateLength(numLEDs);
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}
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}
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#if defined(ESP8266)
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// ESP8266 show() is external to enforce ICACHE_RAM_ATTR execution
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extern "C" void ICACHE_RAM_ATTR espShow(
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uint8_t pin, uint8_t *pixels, uint32_t numBytes, uint8_t type);
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#elif defined(ESP32)
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extern "C" void espShow(
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uint8_t pin, uint8_t *pixels, uint32_t numBytes, uint8_t type);
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#endif // ESP8266
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void Adafruit_NeoPixel::show(void) {
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if(!pixels) return;
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// Data latch = 300+ microsecond pause in the output stream. Rather than
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// put a delay at the end of the function, the ending time is noted and
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// the function will simply hold off (if needed) on issuing the
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// subsequent round of data until the latch time has elapsed. This
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// allows the mainline code to start generating the next frame of data
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// rather than stalling for the latch.
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while(!canShow());
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// endTime is a private member (rather than global var) so that mutliple
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// instances on different pins can be quickly issued in succession (each
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// instance doesn't delay the next).
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// In order to make this code runtime-configurable to work with any pin,
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// SBI/CBI instructions are eschewed in favor of full PORT writes via the
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// OUT or ST instructions. It relies on two facts: that peripheral
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// functions (such as PWM) take precedence on output pins, so our PORT-
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// wide writes won't interfere, and that interrupts are globally disabled
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// while data is being issued to the LEDs, so no other code will be
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// accessing the PORT. The code takes an initial 'snapshot' of the PORT
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// state, computes 'pin high' and 'pin low' values, and writes these back
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// to the PORT register as needed.
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// NRF52 may use PWM + DMA (if available), may not need to disable interrupt
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#ifndef NRF52
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noInterrupts(); // Need 100% focus on instruction timing
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#endif
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#ifdef __AVR__
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// AVR MCUs -- ATmega & ATtiny (no XMEGA) ---------------------------------
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volatile uint16_t
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i = numBytes; // Loop counter
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volatile uint8_t
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*ptr = pixels, // Pointer to next byte
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b = *ptr++, // Current byte value
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hi, // PORT w/output bit set high
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lo; // PORT w/output bit set low
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// Hand-tuned assembly code issues data to the LED drivers at a specific
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// rate. There's separate code for different CPU speeds (8, 12, 16 MHz)
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// for both the WS2811 (400 KHz) and WS2812 (800 KHz) drivers. The
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// datastream timing for the LED drivers allows a little wiggle room each
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// way (listed in the datasheets), so the conditions for compiling each
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// case are set up for a range of frequencies rather than just the exact
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// 8, 12 or 16 MHz values, permitting use with some close-but-not-spot-on
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// devices (e.g. 16.5 MHz DigiSpark). The ranges were arrived at based
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// on the datasheet figures and have not been extensively tested outside
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// the canonical 8/12/16 MHz speeds; there's no guarantee these will work
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// close to the extremes (or possibly they could be pushed further).
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// Keep in mind only one CPU speed case actually gets compiled; the
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// resulting program isn't as massive as it might look from source here.
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// 8 MHz(ish) AVR ---------------------------------------------------------
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#if (F_CPU >= 7400000UL) && (F_CPU <= 9500000UL)
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#ifdef NEO_KHZ400 // 800 KHz check needed only if 400 KHz support enabled
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if(is800KHz) {
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#endif
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volatile uint8_t n1, n2 = 0; // First, next bits out
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// Squeezing an 800 KHz stream out of an 8 MHz chip requires code
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// specific to each PORT register.
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// 10 instruction clocks per bit: HHxxxxxLLL
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// OUT instructions: ^ ^ ^ (T=0,2,7)
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// PORTD OUTPUT ----------------------------------------------------
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#if defined(PORTD)
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#if defined(PORTB) || defined(PORTC) || defined(PORTF)
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if(port == &PORTD) {
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#endif // defined(PORTB/C/F)
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hi = PORTD | pinMask;
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lo = PORTD & ~pinMask;
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n1 = lo;
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if(b & 0x80) n1 = hi;
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// Dirty trick: RJMPs proceeding to the next instruction are used
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// to delay two clock cycles in one instruction word (rather than
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// using two NOPs). This was necessary in order to squeeze the
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// loop down to exactly 64 words -- the maximum possible for a
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// relative branch.
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asm volatile(
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"headD:" "\n\t" // Clk Pseudocode
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// Bit 7:
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"out %[port] , %[hi]" "\n\t" // 1 PORT = hi
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"mov %[n2] , %[lo]" "\n\t" // 1 n2 = lo
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"out %[port] , %[n1]" "\n\t" // 1 PORT = n1
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"rjmp .+0" "\n\t" // 2 nop nop
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"sbrc %[byte] , 6" "\n\t" // 1-2 if(b & 0x40)
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"mov %[n2] , %[hi]" "\n\t" // 0-1 n2 = hi
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"out %[port] , %[lo]" "\n\t" // 1 PORT = lo
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"rjmp .+0" "\n\t" // 2 nop nop
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// Bit 6:
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"out %[port] , %[hi]" "\n\t" // 1 PORT = hi
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"mov %[n1] , %[lo]" "\n\t" // 1 n1 = lo
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"out %[port] , %[n2]" "\n\t" // 1 PORT = n2
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"rjmp .+0" "\n\t" // 2 nop nop
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"sbrc %[byte] , 5" "\n\t" // 1-2 if(b & 0x20)
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"mov %[n1] , %[hi]" "\n\t" // 0-1 n1 = hi
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"out %[port] , %[lo]" "\n\t" // 1 PORT = lo
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"rjmp .+0" "\n\t" // 2 nop nop
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// Bit 5:
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"out %[port] , %[hi]" "\n\t" // 1 PORT = hi
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"mov %[n2] , %[lo]" "\n\t" // 1 n2 = lo
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"out %[port] , %[n1]" "\n\t" // 1 PORT = n1
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"rjmp .+0" "\n\t" // 2 nop nop
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"sbrc %[byte] , 4" "\n\t" // 1-2 if(b & 0x10)
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"mov %[n2] , %[hi]" "\n\t" // 0-1 n2 = hi
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"out %[port] , %[lo]" "\n\t" // 1 PORT = lo
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"rjmp .+0" "\n\t" // 2 nop nop
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// Bit 4:
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"out %[port] , %[hi]" "\n\t" // 1 PORT = hi
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"mov %[n1] , %[lo]" "\n\t" // 1 n1 = lo
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"out %[port] , %[n2]" "\n\t" // 1 PORT = n2
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"rjmp .+0" "\n\t" // 2 nop nop
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"sbrc %[byte] , 3" "\n\t" // 1-2 if(b & 0x08)
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"mov %[n1] , %[hi]" "\n\t" // 0-1 n1 = hi
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"out %[port] , %[lo]" "\n\t" // 1 PORT = lo
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"rjmp .+0" "\n\t" // 2 nop nop
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// Bit 3:
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"out %[port] , %[hi]" "\n\t" // 1 PORT = hi
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"mov %[n2] , %[lo]" "\n\t" // 1 n2 = lo
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"out %[port] , %[n1]" "\n\t" // 1 PORT = n1
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"rjmp .+0" "\n\t" // 2 nop nop
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"sbrc %[byte] , 2" "\n\t" // 1-2 if(b & 0x04)
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"mov %[n2] , %[hi]" "\n\t" // 0-1 n2 = hi
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"out %[port] , %[lo]" "\n\t" // 1 PORT = lo
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"rjmp .+0" "\n\t" // 2 nop nop
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// Bit 2:
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"out %[port] , %[hi]" "\n\t" // 1 PORT = hi
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"mov %[n1] , %[lo]" "\n\t" // 1 n1 = lo
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"out %[port] , %[n2]" "\n\t" // 1 PORT = n2
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"rjmp .+0" "\n\t" // 2 nop nop
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"sbrc %[byte] , 1" "\n\t" // 1-2 if(b & 0x02)
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"mov %[n1] , %[hi]" "\n\t" // 0-1 n1 = hi
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"out %[port] , %[lo]" "\n\t" // 1 PORT = lo
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"rjmp .+0" "\n\t" // 2 nop nop
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// Bit 1:
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"out %[port] , %[hi]" "\n\t" // 1 PORT = hi
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"mov %[n2] , %[lo]" "\n\t" // 1 n2 = lo
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"out %[port] , %[n1]" "\n\t" // 1 PORT = n1
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"rjmp .+0" "\n\t" // 2 nop nop
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"sbrc %[byte] , 0" "\n\t" // 1-2 if(b & 0x01)
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"mov %[n2] , %[hi]" "\n\t" // 0-1 n2 = hi
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"out %[port] , %[lo]" "\n\t" // 1 PORT = lo
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"sbiw %[count], 1" "\n\t" // 2 i-- (don't act on Z flag yet)
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// Bit 0:
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"out %[port] , %[hi]" "\n\t" // 1 PORT = hi
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"mov %[n1] , %[lo]" "\n\t" // 1 n1 = lo
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"out %[port] , %[n2]" "\n\t" // 1 PORT = n2
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"ld %[byte] , %a[ptr]+" "\n\t" // 2 b = *ptr++
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"sbrc %[byte] , 7" "\n\t" // 1-2 if(b & 0x80)
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"mov %[n1] , %[hi]" "\n\t" // 0-1 n1 = hi
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"out %[port] , %[lo]" "\n\t" // 1 PORT = lo
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"brne headD" "\n" // 2 while(i) (Z flag set above)
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: [byte] "+r" (b),
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[n1] "+r" (n1),
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[n2] "+r" (n2),
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[count] "+w" (i)
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: [port] "I" (_SFR_IO_ADDR(PORTD)),
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[ptr] "e" (ptr),
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[hi] "r" (hi),
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[lo] "r" (lo));
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#if defined(PORTB) || defined(PORTC) || defined(PORTF)
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} else // other PORT(s)
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#endif // defined(PORTB/C/F)
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#endif // defined(PORTD)
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// PORTB OUTPUT ----------------------------------------------------
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#if defined(PORTB)
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#if defined(PORTD) || defined(PORTC) || defined(PORTF)
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if(port == &PORTB) {
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#endif // defined(PORTD/C/F)
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// Same as above, just switched to PORTB and stripped of comments.
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hi = PORTB | pinMask;
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lo = PORTB & ~pinMask;
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n1 = lo;
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if(b & 0x80) n1 = hi;
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asm volatile(
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"headB:" "\n\t"
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"out %[port] , %[hi]" "\n\t"
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"mov %[n2] , %[lo]" "\n\t"
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"out %[port] , %[n1]" "\n\t"
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"rjmp .+0" "\n\t"
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"sbrc %[byte] , 6" "\n\t"
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"mov %[n2] , %[hi]" "\n\t"
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"out %[port] , %[lo]" "\n\t"
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"rjmp .+0" "\n\t"
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"out %[port] , %[hi]" "\n\t"
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"mov %[n1] , %[lo]" "\n\t"
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"out %[port] , %[n2]" "\n\t"
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"rjmp .+0" "\n\t"
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"sbrc %[byte] , 5" "\n\t"
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"mov %[n1] , %[hi]" "\n\t"
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"out %[port] , %[lo]" "\n\t"
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"rjmp .+0" "\n\t"
|
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"out %[port] , %[hi]" "\n\t"
|
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"mov %[n2] , %[lo]" "\n\t"
|
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"out %[port] , %[n1]" "\n\t"
|
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"rjmp .+0" "\n\t"
|
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"sbrc %[byte] , 4" "\n\t"
|
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"mov %[n2] , %[hi]" "\n\t"
|
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"out %[port] , %[lo]" "\n\t"
|
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"rjmp .+0" "\n\t"
|
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"out %[port] , %[hi]" "\n\t"
|
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"mov %[n1] , %[lo]" "\n\t"
|
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"out %[port] , %[n2]" "\n\t"
|
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"rjmp .+0" "\n\t"
|
|
"sbrc %[byte] , 3" "\n\t"
|
|
"mov %[n1] , %[hi]" "\n\t"
|
|
"out %[port] , %[lo]" "\n\t"
|
|
"rjmp .+0" "\n\t"
|
|
"out %[port] , %[hi]" "\n\t"
|
|
"mov %[n2] , %[lo]" "\n\t"
|
|
"out %[port] , %[n1]" "\n\t"
|
|
"rjmp .+0" "\n\t"
|
|
"sbrc %[byte] , 2" "\n\t"
|
|
"mov %[n2] , %[hi]" "\n\t"
|
|
"out %[port] , %[lo]" "\n\t"
|
|
"rjmp .+0" "\n\t"
|
|
"out %[port] , %[hi]" "\n\t"
|
|
"mov %[n1] , %[lo]" "\n\t"
|
|
"out %[port] , %[n2]" "\n\t"
|
|
"rjmp .+0" "\n\t"
|
|
"sbrc %[byte] , 1" "\n\t"
|
|
"mov %[n1] , %[hi]" "\n\t"
|
|
"out %[port] , %[lo]" "\n\t"
|
|
"rjmp .+0" "\n\t"
|
|
"out %[port] , %[hi]" "\n\t"
|
|
"mov %[n2] , %[lo]" "\n\t"
|
|
"out %[port] , %[n1]" "\n\t"
|
|
"rjmp .+0" "\n\t"
|
|
"sbrc %[byte] , 0" "\n\t"
|
|
"mov %[n2] , %[hi]" "\n\t"
|
|
"out %[port] , %[lo]" "\n\t"
|
|
"sbiw %[count], 1" "\n\t"
|
|
"out %[port] , %[hi]" "\n\t"
|
|
"mov %[n1] , %[lo]" "\n\t"
|
|
"out %[port] , %[n2]" "\n\t"
|
|
"ld %[byte] , %a[ptr]+" "\n\t"
|
|
"sbrc %[byte] , 7" "\n\t"
|
|
"mov %[n1] , %[hi]" "\n\t"
|
|
"out %[port] , %[lo]" "\n\t"
|
|
"brne headB" "\n"
|
|
: [byte] "+r" (b), [n1] "+r" (n1), [n2] "+r" (n2), [count] "+w" (i)
|
|
: [port] "I" (_SFR_IO_ADDR(PORTB)), [ptr] "e" (ptr), [hi] "r" (hi),
|
|
[lo] "r" (lo));
|
|
|
|
#if defined(PORTD) || defined(PORTC) || defined(PORTF)
|
|
}
|
|
#endif
|
|
#if defined(PORTC) || defined(PORTF)
|
|
else
|
|
#endif // defined(PORTC/F)
|
|
#endif // defined(PORTB)
|
|
|
|
// PORTC OUTPUT ----------------------------------------------------
|
|
|
|
#if defined(PORTC)
|
|
#if defined(PORTD) || defined(PORTB) || defined(PORTF)
|
|
if(port == &PORTC) {
|
|
#endif // defined(PORTD/B/F)
|
|
|
|
// Same as above, just switched to PORTC and stripped of comments.
|
|
hi = PORTC | pinMask;
|
|
lo = PORTC & ~pinMask;
|
|
n1 = lo;
|
|
if(b & 0x80) n1 = hi;
|
|
|
|
asm volatile(
|
|
"headC:" "\n\t"
|
|
"out %[port] , %[hi]" "\n\t"
|
|
"mov %[n2] , %[lo]" "\n\t"
|
|
"out %[port] , %[n1]" "\n\t"
|
|
"rjmp .+0" "\n\t"
|
|
"sbrc %[byte] , 6" "\n\t"
|
|
"mov %[n2] , %[hi]" "\n\t"
|
|
"out %[port] , %[lo]" "\n\t"
|
|
"rjmp .+0" "\n\t"
|
|
"out %[port] , %[hi]" "\n\t"
|
|
"mov %[n1] , %[lo]" "\n\t"
|
|
"out %[port] , %[n2]" "\n\t"
|
|
"rjmp .+0" "\n\t"
|
|
"sbrc %[byte] , 5" "\n\t"
|
|
"mov %[n1] , %[hi]" "\n\t"
|
|
"out %[port] , %[lo]" "\n\t"
|
|
"rjmp .+0" "\n\t"
|
|
"out %[port] , %[hi]" "\n\t"
|
|
"mov %[n2] , %[lo]" "\n\t"
|
|
"out %[port] , %[n1]" "\n\t"
|
|
"rjmp .+0" "\n\t"
|
|
"sbrc %[byte] , 4" "\n\t"
|
|
"mov %[n2] , %[hi]" "\n\t"
|
|
"out %[port] , %[lo]" "\n\t"
|
|
"rjmp .+0" "\n\t"
|
|
"out %[port] , %[hi]" "\n\t"
|
|
"mov %[n1] , %[lo]" "\n\t"
|
|
"out %[port] , %[n2]" "\n\t"
|
|
"rjmp .+0" "\n\t"
|
|
"sbrc %[byte] , 3" "\n\t"
|
|
"mov %[n1] , %[hi]" "\n\t"
|
|
"out %[port] , %[lo]" "\n\t"
|
|
"rjmp .+0" "\n\t"
|
|
"out %[port] , %[hi]" "\n\t"
|
|
"mov %[n2] , %[lo]" "\n\t"
|
|
"out %[port] , %[n1]" "\n\t"
|
|
"rjmp .+0" "\n\t"
|
|
"sbrc %[byte] , 2" "\n\t"
|
|
"mov %[n2] , %[hi]" "\n\t"
|
|
"out %[port] , %[lo]" "\n\t"
|
|
"rjmp .+0" "\n\t"
|
|
"out %[port] , %[hi]" "\n\t"
|
|
"mov %[n1] , %[lo]" "\n\t"
|
|
"out %[port] , %[n2]" "\n\t"
|
|
"rjmp .+0" "\n\t"
|
|
"sbrc %[byte] , 1" "\n\t"
|
|
"mov %[n1] , %[hi]" "\n\t"
|
|
"out %[port] , %[lo]" "\n\t"
|
|
"rjmp .+0" "\n\t"
|
|
"out %[port] , %[hi]" "\n\t"
|
|
"mov %[n2] , %[lo]" "\n\t"
|
|
"out %[port] , %[n1]" "\n\t"
|
|
"rjmp .+0" "\n\t"
|
|
"sbrc %[byte] , 0" "\n\t"
|
|
"mov %[n2] , %[hi]" "\n\t"
|
|
"out %[port] , %[lo]" "\n\t"
|
|
"sbiw %[count], 1" "\n\t"
|
|
"out %[port] , %[hi]" "\n\t"
|
|
"mov %[n1] , %[lo]" "\n\t"
|
|
"out %[port] , %[n2]" "\n\t"
|
|
"ld %[byte] , %a[ptr]+" "\n\t"
|
|
"sbrc %[byte] , 7" "\n\t"
|
|
"mov %[n1] , %[hi]" "\n\t"
|
|
"out %[port] , %[lo]" "\n\t"
|
|
"brne headC" "\n"
|
|
: [byte] "+r" (b), [n1] "+r" (n1), [n2] "+r" (n2), [count] "+w" (i)
|
|
: [port] "I" (_SFR_IO_ADDR(PORTC)), [ptr] "e" (ptr), [hi] "r" (hi),
|
|
[lo] "r" (lo));
|
|
|
|
#if defined(PORTD) || defined(PORTB) || defined(PORTF)
|
|
}
|
|
#endif // defined(PORTD/B/F)
|
|
#if defined(PORTF)
|
|
else
|
|
#endif
|
|
#endif // defined(PORTC)
|
|
|
|
// PORTF OUTPUT ----------------------------------------------------
|
|
|
|
#if defined(PORTF)
|
|
#if defined(PORTD) || defined(PORTB) || defined(PORTC)
|
|
if(port == &PORTF) {
|
|
#endif // defined(PORTD/B/C)
|
|
|
|
hi = PORTF | pinMask;
|
|
lo = PORTF & ~pinMask;
|
|
n1 = lo;
|
|
if(b & 0x80) n1 = hi;
|
|
|
|
asm volatile(
|
|
"headF:" "\n\t"
|
|
"out %[port] , %[hi]" "\n\t"
|
|
"mov %[n2] , %[lo]" "\n\t"
|
|
"out %[port] , %[n1]" "\n\t"
|
|
"rjmp .+0" "\n\t"
|
|
"sbrc %[byte] , 6" "\n\t"
|
|
"mov %[n2] , %[hi]" "\n\t"
|
|
"out %[port] , %[lo]" "\n\t"
|
|
"rjmp .+0" "\n\t"
|
|
"out %[port] , %[hi]" "\n\t"
|
|
"mov %[n1] , %[lo]" "\n\t"
|
|
"out %[port] , %[n2]" "\n\t"
|
|
"rjmp .+0" "\n\t"
|
|
"sbrc %[byte] , 5" "\n\t"
|
|
"mov %[n1] , %[hi]" "\n\t"
|
|
"out %[port] , %[lo]" "\n\t"
|
|
"rjmp .+0" "\n\t"
|
|
"out %[port] , %[hi]" "\n\t"
|
|
"mov %[n2] , %[lo]" "\n\t"
|
|
"out %[port] , %[n1]" "\n\t"
|
|
"rjmp .+0" "\n\t"
|
|
"sbrc %[byte] , 4" "\n\t"
|
|
"mov %[n2] , %[hi]" "\n\t"
|
|
"out %[port] , %[lo]" "\n\t"
|
|
"rjmp .+0" "\n\t"
|
|
"out %[port] , %[hi]" "\n\t"
|
|
"mov %[n1] , %[lo]" "\n\t"
|
|
"out %[port] , %[n2]" "\n\t"
|
|
"rjmp .+0" "\n\t"
|
|
"sbrc %[byte] , 3" "\n\t"
|
|
"mov %[n1] , %[hi]" "\n\t"
|
|
"out %[port] , %[lo]" "\n\t"
|
|
"rjmp .+0" "\n\t"
|
|
"out %[port] , %[hi]" "\n\t"
|
|
"mov %[n2] , %[lo]" "\n\t"
|
|
"out %[port] , %[n1]" "\n\t"
|
|
"rjmp .+0" "\n\t"
|
|
"sbrc %[byte] , 2" "\n\t"
|
|
"mov %[n2] , %[hi]" "\n\t"
|
|
"out %[port] , %[lo]" "\n\t"
|
|
"rjmp .+0" "\n\t"
|
|
"out %[port] , %[hi]" "\n\t"
|
|
"mov %[n1] , %[lo]" "\n\t"
|
|
"out %[port] , %[n2]" "\n\t"
|
|
"rjmp .+0" "\n\t"
|
|
"sbrc %[byte] , 1" "\n\t"
|
|
"mov %[n1] , %[hi]" "\n\t"
|
|
"out %[port] , %[lo]" "\n\t"
|
|
"rjmp .+0" "\n\t"
|
|
"out %[port] , %[hi]" "\n\t"
|
|
"mov %[n2] , %[lo]" "\n\t"
|
|
"out %[port] , %[n1]" "\n\t"
|
|
"rjmp .+0" "\n\t"
|
|
"sbrc %[byte] , 0" "\n\t"
|
|
"mov %[n2] , %[hi]" "\n\t"
|
|
"out %[port] , %[lo]" "\n\t"
|
|
"sbiw %[count], 1" "\n\t"
|
|
"out %[port] , %[hi]" "\n\t"
|
|
"mov %[n1] , %[lo]" "\n\t"
|
|
"out %[port] , %[n2]" "\n\t"
|
|
"ld %[byte] , %a[ptr]+" "\n\t"
|
|
"sbrc %[byte] , 7" "\n\t"
|
|
"mov %[n1] , %[hi]" "\n\t"
|
|
"out %[port] , %[lo]" "\n\t"
|
|
"brne headF" "\n"
|
|
: [byte] "+r" (b), [n1] "+r" (n1), [n2] "+r" (n2), [count] "+w" (i)
|
|
: [port] "I" (_SFR_IO_ADDR(PORTF)), [ptr] "e" (ptr), [hi] "r" (hi),
|
|
[lo] "r" (lo));
|
|
|
|
#if defined(PORTD) || defined(PORTB) || defined(PORTC)
|
|
}
|
|
#endif // defined(PORTD/B/C)
|
|
#endif // defined(PORTF)
|
|
|
|
#ifdef NEO_KHZ400
|
|
} else { // end 800 KHz, do 400 KHz
|
|
|
|
// Timing is more relaxed; unrolling the inner loop for each bit is
|
|
// not necessary. Still using the peculiar RJMPs as 2X NOPs, not out
|
|
// of need but just to trim the code size down a little.
|
|
// This 400-KHz-datastream-on-8-MHz-CPU code is not quite identical
|
|
// to the 800-on-16 code later -- the hi/lo timing between WS2811 and
|
|
// WS2812 is not simply a 2:1 scale!
|
|
|
|
// 20 inst. clocks per bit: HHHHxxxxxxLLLLLLLLLL
|
|
// ST instructions: ^ ^ ^ (T=0,4,10)
|
|
|
|
volatile uint8_t next, bit;
|
|
|
|
hi = *port | pinMask;
|
|
lo = *port & ~pinMask;
|
|
next = lo;
|
|
bit = 8;
|
|
|
|
asm volatile(
|
|
"head20:" "\n\t" // Clk Pseudocode (T = 0)
|
|
"st %a[port], %[hi]" "\n\t" // 2 PORT = hi (T = 2)
|
|
"sbrc %[byte] , 7" "\n\t" // 1-2 if(b & 128)
|
|
"mov %[next], %[hi]" "\n\t" // 0-1 next = hi (T = 4)
|
|
"st %a[port], %[next]" "\n\t" // 2 PORT = next (T = 6)
|
|
"mov %[next] , %[lo]" "\n\t" // 1 next = lo (T = 7)
|
|
"dec %[bit]" "\n\t" // 1 bit-- (T = 8)
|
|
"breq nextbyte20" "\n\t" // 1-2 if(bit == 0)
|
|
"rol %[byte]" "\n\t" // 1 b <<= 1 (T = 10)
|
|
"st %a[port], %[lo]" "\n\t" // 2 PORT = lo (T = 12)
|
|
"rjmp .+0" "\n\t" // 2 nop nop (T = 14)
|
|
"rjmp .+0" "\n\t" // 2 nop nop (T = 16)
|
|
"rjmp .+0" "\n\t" // 2 nop nop (T = 18)
|
|
"rjmp head20" "\n\t" // 2 -> head20 (next bit out)
|
|
"nextbyte20:" "\n\t" // (T = 10)
|
|
"st %a[port], %[lo]" "\n\t" // 2 PORT = lo (T = 12)
|
|
"nop" "\n\t" // 1 nop (T = 13)
|
|
"ldi %[bit] , 8" "\n\t" // 1 bit = 8 (T = 14)
|
|
"ld %[byte] , %a[ptr]+" "\n\t" // 2 b = *ptr++ (T = 16)
|
|
"sbiw %[count], 1" "\n\t" // 2 i-- (T = 18)
|
|
"brne head20" "\n" // 2 if(i != 0) -> (next byte)
|
|
: [port] "+e" (port),
|
|
[byte] "+r" (b),
|
|
[bit] "+r" (bit),
|
|
[next] "+r" (next),
|
|
[count] "+w" (i)
|
|
: [hi] "r" (hi),
|
|
[lo] "r" (lo),
|
|
[ptr] "e" (ptr));
|
|
}
|
|
#endif // NEO_KHZ400
|
|
|
|
// 12 MHz(ish) AVR --------------------------------------------------------
|
|
#elif (F_CPU >= 11100000UL) && (F_CPU <= 14300000UL)
|
|
|
|
#ifdef NEO_KHZ400 // 800 KHz check needed only if 400 KHz support enabled
|
|
if(is800KHz) {
|
|
#endif
|
|
|
|
// In the 12 MHz case, an optimized 800 KHz datastream (no dead time
|
|
// between bytes) requires a PORT-specific loop similar to the 8 MHz
|
|
// code (but a little more relaxed in this case).
|
|
|
|
// 15 instruction clocks per bit: HHHHxxxxxxLLLLL
|
|
// OUT instructions: ^ ^ ^ (T=0,4,10)
|
|
|
|
volatile uint8_t next;
|
|
|
|
// PORTD OUTPUT ----------------------------------------------------
|
|
|
|
#if defined(PORTD)
|
|
#if defined(PORTB) || defined(PORTC) || defined(PORTF)
|
|
if(port == &PORTD) {
|
|
#endif // defined(PORTB/C/F)
|
|
|
|
hi = PORTD | pinMask;
|
|
lo = PORTD & ~pinMask;
|
|
next = lo;
|
|
if(b & 0x80) next = hi;
|
|
|
|
// Don't "optimize" the OUT calls into the bitTime subroutine;
|
|
// we're exploiting the RCALL and RET as 3- and 4-cycle NOPs!
|
|
asm volatile(
|
|
"headD:" "\n\t" // (T = 0)
|
|
"out %[port], %[hi]" "\n\t" // (T = 1)
|
|
"rcall bitTimeD" "\n\t" // Bit 7 (T = 15)
|
|
"out %[port], %[hi]" "\n\t"
|
|
"rcall bitTimeD" "\n\t" // Bit 6
|
|
"out %[port], %[hi]" "\n\t"
|
|
"rcall bitTimeD" "\n\t" // Bit 5
|
|
"out %[port], %[hi]" "\n\t"
|
|
"rcall bitTimeD" "\n\t" // Bit 4
|
|
"out %[port], %[hi]" "\n\t"
|
|
"rcall bitTimeD" "\n\t" // Bit 3
|
|
"out %[port], %[hi]" "\n\t"
|
|
"rcall bitTimeD" "\n\t" // Bit 2
|
|
"out %[port], %[hi]" "\n\t"
|
|
"rcall bitTimeD" "\n\t" // Bit 1
|
|
// Bit 0:
|
|
"out %[port] , %[hi]" "\n\t" // 1 PORT = hi (T = 1)
|
|
"rjmp .+0" "\n\t" // 2 nop nop (T = 3)
|
|
"ld %[byte] , %a[ptr]+" "\n\t" // 2 b = *ptr++ (T = 5)
|
|
"out %[port] , %[next]" "\n\t" // 1 PORT = next (T = 6)
|
|
"mov %[next] , %[lo]" "\n\t" // 1 next = lo (T = 7)
|
|
"sbrc %[byte] , 7" "\n\t" // 1-2 if(b & 0x80) (T = 8)
|
|
"mov %[next] , %[hi]" "\n\t" // 0-1 next = hi (T = 9)
|
|
"nop" "\n\t" // 1 (T = 10)
|
|
"out %[port] , %[lo]" "\n\t" // 1 PORT = lo (T = 11)
|
|
"sbiw %[count], 1" "\n\t" // 2 i-- (T = 13)
|
|
"brne headD" "\n\t" // 2 if(i != 0) -> (next byte)
|
|
"rjmp doneD" "\n\t"
|
|
"bitTimeD:" "\n\t" // nop nop nop (T = 4)
|
|
"out %[port], %[next]" "\n\t" // 1 PORT = next (T = 5)
|
|
"mov %[next], %[lo]" "\n\t" // 1 next = lo (T = 6)
|
|
"rol %[byte]" "\n\t" // 1 b <<= 1 (T = 7)
|
|
"sbrc %[byte], 7" "\n\t" // 1-2 if(b & 0x80) (T = 8)
|
|
"mov %[next], %[hi]" "\n\t" // 0-1 next = hi (T = 9)
|
|
"nop" "\n\t" // 1 (T = 10)
|
|
"out %[port], %[lo]" "\n\t" // 1 PORT = lo (T = 11)
|
|
"ret" "\n\t" // 4 nop nop nop nop (T = 15)
|
|
"doneD:" "\n"
|
|
: [byte] "+r" (b),
|
|
[next] "+r" (next),
|
|
[count] "+w" (i)
|
|
: [port] "I" (_SFR_IO_ADDR(PORTD)),
|
|
[ptr] "e" (ptr),
|
|
[hi] "r" (hi),
|
|
[lo] "r" (lo));
|
|
|
|
#if defined(PORTB) || defined(PORTC) || defined(PORTF)
|
|
} else // other PORT(s)
|
|
#endif // defined(PORTB/C/F)
|
|
#endif // defined(PORTD)
|
|
|
|
// PORTB OUTPUT ----------------------------------------------------
|
|
|
|
#if defined(PORTB)
|
|
#if defined(PORTD) || defined(PORTC) || defined(PORTF)
|
|
if(port == &PORTB) {
|
|
#endif // defined(PORTD/C/F)
|
|
|
|
hi = PORTB | pinMask;
|
|
lo = PORTB & ~pinMask;
|
|
next = lo;
|
|
if(b & 0x80) next = hi;
|
|
|
|
// Same as above, just set for PORTB & stripped of comments
|
|
asm volatile(
|
|
"headB:" "\n\t"
|
|
"out %[port], %[hi]" "\n\t"
|
|
"rcall bitTimeB" "\n\t"
|
|
"out %[port], %[hi]" "\n\t"
|
|
"rcall bitTimeB" "\n\t"
|
|
"out %[port], %[hi]" "\n\t"
|
|
"rcall bitTimeB" "\n\t"
|
|
"out %[port], %[hi]" "\n\t"
|
|
"rcall bitTimeB" "\n\t"
|
|
"out %[port], %[hi]" "\n\t"
|
|
"rcall bitTimeB" "\n\t"
|
|
"out %[port], %[hi]" "\n\t"
|
|
"rcall bitTimeB" "\n\t"
|
|
"out %[port], %[hi]" "\n\t"
|
|
"rcall bitTimeB" "\n\t"
|
|
"out %[port] , %[hi]" "\n\t"
|
|
"rjmp .+0" "\n\t"
|
|
"ld %[byte] , %a[ptr]+" "\n\t"
|
|
"out %[port] , %[next]" "\n\t"
|
|
"mov %[next] , %[lo]" "\n\t"
|
|
"sbrc %[byte] , 7" "\n\t"
|
|
"mov %[next] , %[hi]" "\n\t"
|
|
"nop" "\n\t"
|
|
"out %[port] , %[lo]" "\n\t"
|
|
"sbiw %[count], 1" "\n\t"
|
|
"brne headB" "\n\t"
|
|
"rjmp doneB" "\n\t"
|
|
"bitTimeB:" "\n\t"
|
|
"out %[port], %[next]" "\n\t"
|
|
"mov %[next], %[lo]" "\n\t"
|
|
"rol %[byte]" "\n\t"
|
|
"sbrc %[byte], 7" "\n\t"
|
|
"mov %[next], %[hi]" "\n\t"
|
|
"nop" "\n\t"
|
|
"out %[port], %[lo]" "\n\t"
|
|
"ret" "\n\t"
|
|
"doneB:" "\n"
|
|
: [byte] "+r" (b), [next] "+r" (next), [count] "+w" (i)
|
|
: [port] "I" (_SFR_IO_ADDR(PORTB)), [ptr] "e" (ptr), [hi] "r" (hi),
|
|
[lo] "r" (lo));
|
|
|
|
#if defined(PORTD) || defined(PORTC) || defined(PORTF)
|
|
}
|
|
#endif
|
|
#if defined(PORTC) || defined(PORTF)
|
|
else
|
|
#endif // defined(PORTC/F)
|
|
#endif // defined(PORTB)
|
|
|
|
// PORTC OUTPUT ----------------------------------------------------
|
|
|
|
#if defined(PORTC)
|
|
#if defined(PORTD) || defined(PORTB) || defined(PORTF)
|
|
if(port == &PORTC) {
|
|
#endif // defined(PORTD/B/F)
|
|
|
|
hi = PORTC | pinMask;
|
|
lo = PORTC & ~pinMask;
|
|
next = lo;
|
|
if(b & 0x80) next = hi;
|
|
|
|
// Same as above, just set for PORTC & stripped of comments
|
|
asm volatile(
|
|
"headC:" "\n\t"
|
|
"out %[port], %[hi]" "\n\t"
|
|
"rcall bitTimeC" "\n\t"
|
|
"out %[port], %[hi]" "\n\t"
|
|
"rcall bitTimeC" "\n\t"
|
|
"out %[port], %[hi]" "\n\t"
|
|
"rcall bitTimeC" "\n\t"
|
|
"out %[port], %[hi]" "\n\t"
|
|
"rcall bitTimeC" "\n\t"
|
|
"out %[port], %[hi]" "\n\t"
|
|
"rcall bitTimeC" "\n\t"
|
|
"out %[port], %[hi]" "\n\t"
|
|
"rcall bitTimeC" "\n\t"
|
|
"out %[port], %[hi]" "\n\t"
|
|
"rcall bitTimeC" "\n\t"
|
|
"out %[port] , %[hi]" "\n\t"
|
|
"rjmp .+0" "\n\t"
|
|
"ld %[byte] , %a[ptr]+" "\n\t"
|
|
"out %[port] , %[next]" "\n\t"
|
|
"mov %[next] , %[lo]" "\n\t"
|
|
"sbrc %[byte] , 7" "\n\t"
|
|
"mov %[next] , %[hi]" "\n\t"
|
|
"nop" "\n\t"
|
|
"out %[port] , %[lo]" "\n\t"
|
|
"sbiw %[count], 1" "\n\t"
|
|
"brne headC" "\n\t"
|
|
"rjmp doneC" "\n\t"
|
|
"bitTimeC:" "\n\t"
|
|
"out %[port], %[next]" "\n\t"
|
|
"mov %[next], %[lo]" "\n\t"
|
|
"rol %[byte]" "\n\t"
|
|
"sbrc %[byte], 7" "\n\t"
|
|
"mov %[next], %[hi]" "\n\t"
|
|
"nop" "\n\t"
|
|
"out %[port], %[lo]" "\n\t"
|
|
"ret" "\n\t"
|
|
"doneC:" "\n"
|
|
: [byte] "+r" (b), [next] "+r" (next), [count] "+w" (i)
|
|
: [port] "I" (_SFR_IO_ADDR(PORTC)), [ptr] "e" (ptr), [hi] "r" (hi),
|
|
[lo] "r" (lo));
|
|
|
|
#if defined(PORTD) || defined(PORTB) || defined(PORTF)
|
|
}
|
|
#endif // defined(PORTD/B/F)
|
|
#if defined(PORTF)
|
|
else
|
|
#endif
|
|
#endif // defined(PORTC)
|
|
|
|
// PORTF OUTPUT ----------------------------------------------------
|
|
|
|
#if defined(PORTF)
|
|
#if defined(PORTD) || defined(PORTB) || defined(PORTC)
|
|
if(port == &PORTF) {
|
|
#endif // defined(PORTD/B/C)
|
|
|
|
hi = PORTF | pinMask;
|
|
lo = PORTF & ~pinMask;
|
|
next = lo;
|
|
if(b & 0x80) next = hi;
|
|
|
|
// Same as above, just set for PORTF & stripped of comments
|
|
asm volatile(
|
|
"headF:" "\n\t"
|
|
"out %[port], %[hi]" "\n\t"
|
|
"rcall bitTimeC" "\n\t"
|
|
"out %[port], %[hi]" "\n\t"
|
|
"rcall bitTimeC" "\n\t"
|
|
"out %[port], %[hi]" "\n\t"
|
|
"rcall bitTimeC" "\n\t"
|
|
"out %[port], %[hi]" "\n\t"
|
|
"rcall bitTimeC" "\n\t"
|
|
"out %[port], %[hi]" "\n\t"
|
|
"rcall bitTimeC" "\n\t"
|
|
"out %[port], %[hi]" "\n\t"
|
|
"rcall bitTimeC" "\n\t"
|
|
"out %[port], %[hi]" "\n\t"
|
|
"rcall bitTimeC" "\n\t"
|
|
"out %[port] , %[hi]" "\n\t"
|
|
"rjmp .+0" "\n\t"
|
|
"ld %[byte] , %a[ptr]+" "\n\t"
|
|
"out %[port] , %[next]" "\n\t"
|
|
"mov %[next] , %[lo]" "\n\t"
|
|
"sbrc %[byte] , 7" "\n\t"
|
|
"mov %[next] , %[hi]" "\n\t"
|
|
"nop" "\n\t"
|
|
"out %[port] , %[lo]" "\n\t"
|
|
"sbiw %[count], 1" "\n\t"
|
|
"brne headF" "\n\t"
|
|
"rjmp doneC" "\n\t"
|
|
"bitTimeC:" "\n\t"
|
|
"out %[port], %[next]" "\n\t"
|
|
"mov %[next], %[lo]" "\n\t"
|
|
"rol %[byte]" "\n\t"
|
|
"sbrc %[byte], 7" "\n\t"
|
|
"mov %[next], %[hi]" "\n\t"
|
|
"nop" "\n\t"
|
|
"out %[port], %[lo]" "\n\t"
|
|
"ret" "\n\t"
|
|
"doneC:" "\n"
|
|
: [byte] "+r" (b), [next] "+r" (next), [count] "+w" (i)
|
|
: [port] "I" (_SFR_IO_ADDR(PORTF)), [ptr] "e" (ptr), [hi] "r" (hi),
|
|
[lo] "r" (lo));
|
|
|
|
#if defined(PORTD) || defined(PORTB) || defined(PORTC)
|
|
}
|
|
#endif // defined(PORTD/B/C)
|
|
#endif // defined(PORTF)
|
|
|
|
#ifdef NEO_KHZ400
|
|
} else { // 400 KHz
|
|
|
|
// 30 instruction clocks per bit: HHHHHHxxxxxxxxxLLLLLLLLLLLLLLL
|
|
// ST instructions: ^ ^ ^ (T=0,6,15)
|
|
|
|
volatile uint8_t next, bit;
|
|
|
|
hi = *port | pinMask;
|
|
lo = *port & ~pinMask;
|
|
next = lo;
|
|
bit = 8;
|
|
|
|
asm volatile(
|
|
"head30:" "\n\t" // Clk Pseudocode (T = 0)
|
|
"st %a[port], %[hi]" "\n\t" // 2 PORT = hi (T = 2)
|
|
"sbrc %[byte] , 7" "\n\t" // 1-2 if(b & 128)
|
|
"mov %[next], %[hi]" "\n\t" // 0-1 next = hi (T = 4)
|
|
"rjmp .+0" "\n\t" // 2 nop nop (T = 6)
|
|
"st %a[port], %[next]" "\n\t" // 2 PORT = next (T = 8)
|
|
"rjmp .+0" "\n\t" // 2 nop nop (T = 10)
|
|
"rjmp .+0" "\n\t" // 2 nop nop (T = 12)
|
|
"rjmp .+0" "\n\t" // 2 nop nop (T = 14)
|
|
"nop" "\n\t" // 1 nop (T = 15)
|
|
"st %a[port], %[lo]" "\n\t" // 2 PORT = lo (T = 17)
|
|
"rjmp .+0" "\n\t" // 2 nop nop (T = 19)
|
|
"dec %[bit]" "\n\t" // 1 bit-- (T = 20)
|
|
"breq nextbyte30" "\n\t" // 1-2 if(bit == 0)
|
|
"rol %[byte]" "\n\t" // 1 b <<= 1 (T = 22)
|
|
"rjmp .+0" "\n\t" // 2 nop nop (T = 24)
|
|
"rjmp .+0" "\n\t" // 2 nop nop (T = 26)
|
|
"rjmp .+0" "\n\t" // 2 nop nop (T = 28)
|
|
"rjmp head30" "\n\t" // 2 -> head30 (next bit out)
|
|
"nextbyte30:" "\n\t" // (T = 22)
|
|
"nop" "\n\t" // 1 nop (T = 23)
|
|
"ldi %[bit] , 8" "\n\t" // 1 bit = 8 (T = 24)
|
|
"ld %[byte] , %a[ptr]+" "\n\t" // 2 b = *ptr++ (T = 26)
|
|
"sbiw %[count], 1" "\n\t" // 2 i-- (T = 28)
|
|
"brne head30" "\n" // 1-2 if(i != 0) -> (next byte)
|
|
: [port] "+e" (port),
|
|
[byte] "+r" (b),
|
|
[bit] "+r" (bit),
|
|
[next] "+r" (next),
|
|
[count] "+w" (i)
|
|
: [hi] "r" (hi),
|
|
[lo] "r" (lo),
|
|
[ptr] "e" (ptr));
|
|
}
|
|
#endif // NEO_KHZ400
|
|
|
|
// 16 MHz(ish) AVR --------------------------------------------------------
|
|
#elif (F_CPU >= 15400000UL) && (F_CPU <= 19000000L)
|
|
|
|
#ifdef NEO_KHZ400 // 800 KHz check needed only if 400 KHz support enabled
|
|
if(is800KHz) {
|
|
#endif
|
|
|
|
// WS2811 and WS2812 have different hi/lo duty cycles; this is
|
|
// similar but NOT an exact copy of the prior 400-on-8 code.
|
|
|
|
// 20 inst. clocks per bit: HHHHHxxxxxxxxLLLLLLL
|
|
// ST instructions: ^ ^ ^ (T=0,5,13)
|
|
|
|
volatile uint8_t next, bit;
|
|
|
|
hi = *port | pinMask;
|
|
lo = *port & ~pinMask;
|
|
next = lo;
|
|
bit = 8;
|
|
|
|
asm volatile(
|
|
"head20:" "\n\t" // Clk Pseudocode (T = 0)
|
|
"st %a[port], %[hi]" "\n\t" // 2 PORT = hi (T = 2)
|
|
"sbrc %[byte], 7" "\n\t" // 1-2 if(b & 128)
|
|
"mov %[next], %[hi]" "\n\t" // 0-1 next = hi (T = 4)
|
|
"dec %[bit]" "\n\t" // 1 bit-- (T = 5)
|
|
"st %a[port], %[next]" "\n\t" // 2 PORT = next (T = 7)
|
|
"mov %[next] , %[lo]" "\n\t" // 1 next = lo (T = 8)
|
|
"breq nextbyte20" "\n\t" // 1-2 if(bit == 0) (from dec above)
|
|
"rol %[byte]" "\n\t" // 1 b <<= 1 (T = 10)
|
|
"rjmp .+0" "\n\t" // 2 nop nop (T = 12)
|
|
"nop" "\n\t" // 1 nop (T = 13)
|
|
"st %a[port], %[lo]" "\n\t" // 2 PORT = lo (T = 15)
|
|
"nop" "\n\t" // 1 nop (T = 16)
|
|
"rjmp .+0" "\n\t" // 2 nop nop (T = 18)
|
|
"rjmp head20" "\n\t" // 2 -> head20 (next bit out)
|
|
"nextbyte20:" "\n\t" // (T = 10)
|
|
"ldi %[bit] , 8" "\n\t" // 1 bit = 8 (T = 11)
|
|
"ld %[byte] , %a[ptr]+" "\n\t" // 2 b = *ptr++ (T = 13)
|
|
"st %a[port], %[lo]" "\n\t" // 2 PORT = lo (T = 15)
|
|
"nop" "\n\t" // 1 nop (T = 16)
|
|
"sbiw %[count], 1" "\n\t" // 2 i-- (T = 18)
|
|
"brne head20" "\n" // 2 if(i != 0) -> (next byte)
|
|
: [port] "+e" (port),
|
|
[byte] "+r" (b),
|
|
[bit] "+r" (bit),
|
|
[next] "+r" (next),
|
|
[count] "+w" (i)
|
|
: [ptr] "e" (ptr),
|
|
[hi] "r" (hi),
|
|
[lo] "r" (lo));
|
|
|
|
#ifdef NEO_KHZ400
|
|
} else { // 400 KHz
|
|
|
|
// The 400 KHz clock on 16 MHz MCU is the most 'relaxed' version.
|
|
|
|
// 40 inst. clocks per bit: HHHHHHHHxxxxxxxxxxxxLLLLLLLLLLLLLLLLLLLL
|
|
// ST instructions: ^ ^ ^ (T=0,8,20)
|
|
|
|
volatile uint8_t next, bit;
|
|
|
|
hi = *port | pinMask;
|
|
lo = *port & ~pinMask;
|
|
next = lo;
|
|
bit = 8;
|
|
|
|
asm volatile(
|
|
"head40:" "\n\t" // Clk Pseudocode (T = 0)
|
|
"st %a[port], %[hi]" "\n\t" // 2 PORT = hi (T = 2)
|
|
"sbrc %[byte] , 7" "\n\t" // 1-2 if(b & 128)
|
|
"mov %[next] , %[hi]" "\n\t" // 0-1 next = hi (T = 4)
|
|
"rjmp .+0" "\n\t" // 2 nop nop (T = 6)
|
|
"rjmp .+0" "\n\t" // 2 nop nop (T = 8)
|
|
"st %a[port], %[next]" "\n\t" // 2 PORT = next (T = 10)
|
|
"rjmp .+0" "\n\t" // 2 nop nop (T = 12)
|
|
"rjmp .+0" "\n\t" // 2 nop nop (T = 14)
|
|
"rjmp .+0" "\n\t" // 2 nop nop (T = 16)
|
|
"rjmp .+0" "\n\t" // 2 nop nop (T = 18)
|
|
"rjmp .+0" "\n\t" // 2 nop nop (T = 20)
|
|
"st %a[port], %[lo]" "\n\t" // 2 PORT = lo (T = 22)
|
|
"nop" "\n\t" // 1 nop (T = 23)
|
|
"mov %[next] , %[lo]" "\n\t" // 1 next = lo (T = 24)
|
|
"dec %[bit]" "\n\t" // 1 bit-- (T = 25)
|
|
"breq nextbyte40" "\n\t" // 1-2 if(bit == 0)
|
|
"rol %[byte]" "\n\t" // 1 b <<= 1 (T = 27)
|
|
"nop" "\n\t" // 1 nop (T = 28)
|
|
"rjmp .+0" "\n\t" // 2 nop nop (T = 30)
|
|
"rjmp .+0" "\n\t" // 2 nop nop (T = 32)
|
|
"rjmp .+0" "\n\t" // 2 nop nop (T = 34)
|
|
"rjmp .+0" "\n\t" // 2 nop nop (T = 36)
|
|
"rjmp .+0" "\n\t" // 2 nop nop (T = 38)
|
|
"rjmp head40" "\n\t" // 2 -> head40 (next bit out)
|
|
"nextbyte40:" "\n\t" // (T = 27)
|
|
"ldi %[bit] , 8" "\n\t" // 1 bit = 8 (T = 28)
|
|
"ld %[byte] , %a[ptr]+" "\n\t" // 2 b = *ptr++ (T = 30)
|
|
"rjmp .+0" "\n\t" // 2 nop nop (T = 32)
|
|
"st %a[port], %[lo]" "\n\t" // 2 PORT = lo (T = 34)
|
|
"rjmp .+0" "\n\t" // 2 nop nop (T = 36)
|
|
"sbiw %[count], 1" "\n\t" // 2 i-- (T = 38)
|
|
"brne head40" "\n" // 1-2 if(i != 0) -> (next byte)
|
|
: [port] "+e" (port),
|
|
[byte] "+r" (b),
|
|
[bit] "+r" (bit),
|
|
[next] "+r" (next),
|
|
[count] "+w" (i)
|
|
: [ptr] "e" (ptr),
|
|
[hi] "r" (hi),
|
|
[lo] "r" (lo));
|
|
}
|
|
#endif // NEO_KHZ400
|
|
|
|
#else
|
|
#error "CPU SPEED NOT SUPPORTED"
|
|
#endif // end F_CPU ifdefs on __AVR__
|
|
|
|
// END AVR ----------------------------------------------------------------
|
|
|
|
|
|
#elif defined(__arm__)
|
|
|
|
// ARM MCUs -- Teensy 3.0, 3.1, LC, Arduino Due ---------------------------
|
|
|
|
#if defined(TEENSYDUINO) && defined(KINETISK) // Teensy 3.0, 3.1, 3.2, 3.5, 3.6
|
|
#define CYCLES_800_T0H (F_CPU / 4000000)
|
|
#define CYCLES_800_T1H (F_CPU / 1250000)
|
|
#define CYCLES_800 (F_CPU / 800000)
|
|
#define CYCLES_400_T0H (F_CPU / 2000000)
|
|
#define CYCLES_400_T1H (F_CPU / 833333)
|
|
#define CYCLES_400 (F_CPU / 400000)
|
|
|
|
uint8_t *p = pixels,
|
|
*end = p + numBytes, pix, mask;
|
|
volatile uint8_t *set = portSetRegister(pin),
|
|
*clr = portClearRegister(pin);
|
|
uint32_t cyc;
|
|
|
|
ARM_DEMCR |= ARM_DEMCR_TRCENA;
|
|
ARM_DWT_CTRL |= ARM_DWT_CTRL_CYCCNTENA;
|
|
|
|
#ifdef NEO_KHZ400 // 800 KHz check needed only if 400 KHz support enabled
|
|
if(is800KHz) {
|
|
#endif
|
|
cyc = ARM_DWT_CYCCNT + CYCLES_800;
|
|
while(p < end) {
|
|
pix = *p++;
|
|
for(mask = 0x80; mask; mask >>= 1) {
|
|
while(ARM_DWT_CYCCNT - cyc < CYCLES_800);
|
|
cyc = ARM_DWT_CYCCNT;
|
|
*set = 1;
|
|
if(pix & mask) {
|
|
while(ARM_DWT_CYCCNT - cyc < CYCLES_800_T1H);
|
|
} else {
|
|
while(ARM_DWT_CYCCNT - cyc < CYCLES_800_T0H);
|
|
}
|
|
*clr = 1;
|
|
}
|
|
}
|
|
while(ARM_DWT_CYCCNT - cyc < CYCLES_800);
|
|
#ifdef NEO_KHZ400
|
|
} else { // 400 kHz bitstream
|
|
cyc = ARM_DWT_CYCCNT + CYCLES_400;
|
|
while(p < end) {
|
|
pix = *p++;
|
|
for(mask = 0x80; mask; mask >>= 1) {
|
|
while(ARM_DWT_CYCCNT - cyc < CYCLES_400);
|
|
cyc = ARM_DWT_CYCCNT;
|
|
*set = 1;
|
|
if(pix & mask) {
|
|
while(ARM_DWT_CYCCNT - cyc < CYCLES_400_T1H);
|
|
} else {
|
|
while(ARM_DWT_CYCCNT - cyc < CYCLES_400_T0H);
|
|
}
|
|
*clr = 1;
|
|
}
|
|
}
|
|
while(ARM_DWT_CYCCNT - cyc < CYCLES_400);
|
|
}
|
|
#endif // NEO_KHZ400
|
|
|
|
#elif defined(TEENSYDUINO) && defined(__MKL26Z64__) // Teensy-LC
|
|
|
|
#if F_CPU == 48000000
|
|
uint8_t *p = pixels,
|
|
pix, count, dly,
|
|
bitmask = digitalPinToBitMask(pin);
|
|
volatile uint8_t *reg = portSetRegister(pin);
|
|
uint32_t num = numBytes;
|
|
asm volatile(
|
|
"L%=_begin:" "\n\t"
|
|
"ldrb %[pix], [%[p], #0]" "\n\t"
|
|
"lsl %[pix], #24" "\n\t"
|
|
"movs %[count], #7" "\n\t"
|
|
"L%=_loop:" "\n\t"
|
|
"lsl %[pix], #1" "\n\t"
|
|
"bcs L%=_loop_one" "\n\t"
|
|
"L%=_loop_zero:"
|
|
"strb %[bitmask], [%[reg], #0]" "\n\t"
|
|
"movs %[dly], #4" "\n\t"
|
|
"L%=_loop_delay_T0H:" "\n\t"
|
|
"sub %[dly], #1" "\n\t"
|
|
"bne L%=_loop_delay_T0H" "\n\t"
|
|
"strb %[bitmask], [%[reg], #4]" "\n\t"
|
|
"movs %[dly], #13" "\n\t"
|
|
"L%=_loop_delay_T0L:" "\n\t"
|
|
"sub %[dly], #1" "\n\t"
|
|
"bne L%=_loop_delay_T0L" "\n\t"
|
|
"b L%=_next" "\n\t"
|
|
"L%=_loop_one:"
|
|
"strb %[bitmask], [%[reg], #0]" "\n\t"
|
|
"movs %[dly], #13" "\n\t"
|
|
"L%=_loop_delay_T1H:" "\n\t"
|
|
"sub %[dly], #1" "\n\t"
|
|
"bne L%=_loop_delay_T1H" "\n\t"
|
|
"strb %[bitmask], [%[reg], #4]" "\n\t"
|
|
"movs %[dly], #4" "\n\t"
|
|
"L%=_loop_delay_T1L:" "\n\t"
|
|
"sub %[dly], #1" "\n\t"
|
|
"bne L%=_loop_delay_T1L" "\n\t"
|
|
"nop" "\n\t"
|
|
"L%=_next:" "\n\t"
|
|
"sub %[count], #1" "\n\t"
|
|
"bne L%=_loop" "\n\t"
|
|
"lsl %[pix], #1" "\n\t"
|
|
"bcs L%=_last_one" "\n\t"
|
|
"L%=_last_zero:"
|
|
"strb %[bitmask], [%[reg], #0]" "\n\t"
|
|
"movs %[dly], #4" "\n\t"
|
|
"L%=_last_delay_T0H:" "\n\t"
|
|
"sub %[dly], #1" "\n\t"
|
|
"bne L%=_last_delay_T0H" "\n\t"
|
|
"strb %[bitmask], [%[reg], #4]" "\n\t"
|
|
"movs %[dly], #10" "\n\t"
|
|
"L%=_last_delay_T0L:" "\n\t"
|
|
"sub %[dly], #1" "\n\t"
|
|
"bne L%=_last_delay_T0L" "\n\t"
|
|
"b L%=_repeat" "\n\t"
|
|
"L%=_last_one:"
|
|
"strb %[bitmask], [%[reg], #0]" "\n\t"
|
|
"movs %[dly], #13" "\n\t"
|
|
"L%=_last_delay_T1H:" "\n\t"
|
|
"sub %[dly], #1" "\n\t"
|
|
"bne L%=_last_delay_T1H" "\n\t"
|
|
"strb %[bitmask], [%[reg], #4]" "\n\t"
|
|
"movs %[dly], #1" "\n\t"
|
|
"L%=_last_delay_T1L:" "\n\t"
|
|
"sub %[dly], #1" "\n\t"
|
|
"bne L%=_last_delay_T1L" "\n\t"
|
|
"nop" "\n\t"
|
|
"L%=_repeat:" "\n\t"
|
|
"add %[p], #1" "\n\t"
|
|
"sub %[num], #1" "\n\t"
|
|
"bne L%=_begin" "\n\t"
|
|
"L%=_done:" "\n\t"
|
|
: [p] "+r" (p),
|
|
[pix] "=&r" (pix),
|
|
[count] "=&r" (count),
|
|
[dly] "=&r" (dly),
|
|
[num] "+r" (num)
|
|
: [bitmask] "r" (bitmask),
|
|
[reg] "r" (reg)
|
|
);
|
|
#else
|
|
#error "Sorry, only 48 MHz is supported, please set Tools > CPU Speed to 48 MHz"
|
|
#endif // F_CPU == 48000000
|
|
|
|
// Begin of support for NRF52832 based boards -------------------------
|
|
|
|
#elif defined(NRF52)
|
|
// [[[Begin of the Neopixel NRF52 EasyDMA implementation
|
|
// by the Hackerspace San Salvador]]]
|
|
// This technique uses the PWM peripheral on the NRF52. The PWM uses the
|
|
// EasyDMA feature included on the chip. This technique loads the duty
|
|
// cycle configuration for each cycle when the PWM is enabled. For this
|
|
// to work we need to store a 16 bit configuration for each bit of the
|
|
// RGB(W) values in the pixel buffer.
|
|
// Comparator values for the PWM were hand picked and are guaranteed to
|
|
// be 100% organic to preserve freshness and high accuracy. Current
|
|
// parameters are:
|
|
// * PWM Clock: 16Mhz
|
|
// * Minimum step time: 62.5ns
|
|
// * Time for zero in high (T0H): 0.31ms
|
|
// * Time for one in high (T1H): 0.75ms
|
|
// * Cycle time: 1.25us
|
|
// * Frequency: 800Khz
|
|
// For 400Khz we just double the calculated times.
|
|
// ---------- BEGIN Constants for the EasyDMA implementation -----------
|
|
// The PWM starts the duty cycle in LOW. To start with HIGH we
|
|
// need to set the 15th bit on each register.
|
|
|
|
// WS2812 (rev A) timing is 0.35 and 0.7us
|
|
//#define MAGIC_T0H 5UL | (0x8000) // 0.3125us
|
|
//#define MAGIC_T1H 12UL | (0x8000) // 0.75us
|
|
|
|
// WS2812B (rev B) timing is 0.4 and 0.8 us
|
|
#define MAGIC_T0H 6UL | (0x8000) // 0.375us
|
|
#define MAGIC_T1H 13UL | (0x8000) // 0.8125us
|
|
|
|
// WS2811 (400 khz) timing is 0.5 and 1.2
|
|
#define MAGIC_T0H_400KHz 8UL | (0x8000) // 0.5us
|
|
#define MAGIC_T1H_400KHz 19UL | (0x8000) // 1.1875us
|
|
|
|
// For 400Khz, we double value of CTOPVAL
|
|
#define CTOPVAL 20UL // 1.25us
|
|
#define CTOPVAL_400KHz 40UL // 2.5us
|
|
|
|
// ---------- END Constants for the EasyDMA implementation -------------
|
|
//
|
|
// If there is no device available an alternative cycle-counter
|
|
// implementation is tried.
|
|
// The nRF52832 runs with a fixed clock of 64Mhz. The alternative
|
|
// implementation is the same as the one used for the Teensy 3.0/1/2 but
|
|
// with the Nordic SDK HAL & registers syntax.
|
|
// The number of cycles was hand picked and is guaranteed to be 100%
|
|
// organic to preserve freshness and high accuracy.
|
|
// ---------- BEGIN Constants for cycle counter implementation ---------
|
|
#define CYCLES_800_T0H 18 // ~0.36 uS
|
|
#define CYCLES_800_T1H 41 // ~0.76 uS
|
|
#define CYCLES_800 71 // ~1.25 uS
|
|
|
|
#define CYCLES_400_T0H 26 // ~0.50 uS
|
|
#define CYCLES_400_T1H 70 // ~1.26 uS
|
|
#define CYCLES_400 156 // ~2.50 uS
|
|
// ---------- END of Constants for cycle counter implementation --------
|
|
|
|
// To support both the SoftDevice + Neopixels we use the EasyDMA
|
|
// feature from the NRF25. However this technique implies to
|
|
// generate a pattern and store it on the memory. The actual
|
|
// memory used in bytes corresponds to the following formula:
|
|
// totalMem = numBytes*8*2+(2*2)
|
|
// The two additional bytes at the end are needed to reset the
|
|
// sequence.
|
|
//
|
|
// If there is not enough memory, we will fall back to cycle counter
|
|
// using DWT
|
|
uint32_t pattern_size = numBytes*8*sizeof(uint16_t)+2*sizeof(uint16_t);
|
|
uint16_t* pixels_pattern = NULL;
|
|
|
|
NRF_PWM_Type* pwm = NULL;
|
|
|
|
// Try to find a free PWM device, which is not enabled
|
|
// and has no connected pins
|
|
NRF_PWM_Type* PWM[3] = {NRF_PWM0, NRF_PWM1, NRF_PWM2};
|
|
for(int device = 0; device<3; device++) {
|
|
if( (PWM[device]->ENABLE == 0) &&
|
|
(PWM[device]->PSEL.OUT[0] & PWM_PSEL_OUT_CONNECT_Msk) &&
|
|
(PWM[device]->PSEL.OUT[1] & PWM_PSEL_OUT_CONNECT_Msk) &&
|
|
(PWM[device]->PSEL.OUT[2] & PWM_PSEL_OUT_CONNECT_Msk) &&
|
|
(PWM[device]->PSEL.OUT[3] & PWM_PSEL_OUT_CONNECT_Msk)
|
|
) {
|
|
pwm = PWM[device];
|
|
break;
|
|
}
|
|
}
|
|
|
|
// only malloc if there is PWM device available
|
|
if ( pwm != NULL ) {
|
|
#ifdef ARDUINO_FEATHER52 // use thread-safe malloc
|
|
pixels_pattern = (uint16_t *) rtos_malloc(pattern_size);
|
|
#else
|
|
pixels_pattern = (uint16_t *) malloc(pattern_size);
|
|
#endif
|
|
}
|
|
|
|
// Use the identified device to choose the implementation
|
|
// If a PWM device is available use DMA
|
|
if( (pixels_pattern != NULL) && (pwm != NULL) ) {
|
|
uint16_t pos = 0; // bit position
|
|
|
|
for(uint16_t n=0; n<numBytes; n++) {
|
|
uint8_t pix = pixels[n];
|
|
|
|
for(uint8_t mask=0x80, i=0; mask>0; mask >>= 1, i++) {
|
|
#ifdef NEO_KHZ400
|
|
if( !is800KHz ) {
|
|
pixels_pattern[pos] = (pix & mask) ? MAGIC_T1H_400KHz : MAGIC_T0H_400KHz;
|
|
}else
|
|
#endif
|
|
{
|
|
pixels_pattern[pos] = (pix & mask) ? MAGIC_T1H : MAGIC_T0H;
|
|
}
|
|
|
|
pos++;
|
|
}
|
|
}
|
|
|
|
// Zero padding to indicate the end of que sequence
|
|
pixels_pattern[++pos] = 0 | (0x8000); // Seq end
|
|
pixels_pattern[++pos] = 0 | (0x8000); // Seq end
|
|
|
|
// Set the wave mode to count UP
|
|
pwm->MODE = (PWM_MODE_UPDOWN_Up << PWM_MODE_UPDOWN_Pos);
|
|
|
|
// Set the PWM to use the 16MHz clock
|
|
pwm->PRESCALER = (PWM_PRESCALER_PRESCALER_DIV_1 << PWM_PRESCALER_PRESCALER_Pos);
|
|
|
|
// Setting of the maximum count
|
|
// but keeping it on 16Mhz allows for more granularity just
|
|
// in case someone wants to do more fine-tuning of the timing.
|
|
#ifdef NEO_KHZ400
|
|
if( !is800KHz ) {
|
|
pwm->COUNTERTOP = (CTOPVAL_400KHz << PWM_COUNTERTOP_COUNTERTOP_Pos);
|
|
}else
|
|
#endif
|
|
{
|
|
pwm->COUNTERTOP = (CTOPVAL << PWM_COUNTERTOP_COUNTERTOP_Pos);
|
|
}
|
|
|
|
// Disable loops, we want the sequence to repeat only once
|
|
pwm->LOOP = (PWM_LOOP_CNT_Disabled << PWM_LOOP_CNT_Pos);
|
|
|
|
// On the "Common" setting the PWM uses the same pattern for the
|
|
// for supported sequences. The pattern is stored on half-word
|
|
// of 16bits
|
|
pwm->DECODER = (PWM_DECODER_LOAD_Common << PWM_DECODER_LOAD_Pos) |
|
|
(PWM_DECODER_MODE_RefreshCount << PWM_DECODER_MODE_Pos);
|
|
|
|
// Pointer to the memory storing the patter
|
|
pwm->SEQ[0].PTR = (uint32_t)(pixels_pattern) << PWM_SEQ_PTR_PTR_Pos;
|
|
|
|
// Calculation of the number of steps loaded from memory.
|
|
pwm->SEQ[0].CNT = (pattern_size/sizeof(uint16_t)) << PWM_SEQ_CNT_CNT_Pos;
|
|
|
|
// The following settings are ignored with the current config.
|
|
pwm->SEQ[0].REFRESH = 0;
|
|
pwm->SEQ[0].ENDDELAY = 0;
|
|
|
|
// The Neopixel implementation is a blocking algorithm. DMA
|
|
// allows for non-blocking operation. To "simulate" a blocking
|
|
// operation we enable the interruption for the end of sequence
|
|
// and block the execution thread until the event flag is set by
|
|
// the peripheral.
|
|
// pwm->INTEN |= (PWM_INTEN_SEQEND0_Enabled<<PWM_INTEN_SEQEND0_Pos);
|
|
|
|
// PSEL must be configured before enabling PWM
|
|
pwm->PSEL.OUT[0] = g_ADigitalPinMap[pin];
|
|
|
|
// Enable the PWM
|
|
pwm->ENABLE = 1;
|
|
|
|
// After all of this and many hours of reading the documentation
|
|
// we are ready to start the sequence...
|
|
pwm->EVENTS_SEQEND[0] = 0;
|
|
pwm->TASKS_SEQSTART[0] = 1;
|
|
|
|
// But we have to wait for the flag to be set.
|
|
while(!pwm->EVENTS_SEQEND[0])
|
|
{
|
|
#ifdef ARDUINO_FEATHER52
|
|
yield();
|
|
#endif
|
|
}
|
|
|
|
// Before leave we clear the flag for the event.
|
|
pwm->EVENTS_SEQEND[0] = 0;
|
|
|
|
// We need to disable the device and disconnect
|
|
// all the outputs before leave or the device will not
|
|
// be selected on the next call.
|
|
// TODO: Check if disabling the device causes performance issues.
|
|
pwm->ENABLE = 0;
|
|
|
|
pwm->PSEL.OUT[0] = 0xFFFFFFFFUL;
|
|
|
|
#ifdef ARDUINO_FEATHER52 // use thread-safe free
|
|
rtos_free(pixels_pattern);
|
|
#else
|
|
free(pixels_pattern);
|
|
#endif
|
|
}// End of DMA implementation
|
|
// ---------------------------------------------------------------------
|
|
else{
|
|
// Fall back to DWT
|
|
#ifdef ARDUINO_FEATHER52
|
|
// Bluefruit Feather 52 uses freeRTOS
|
|
// Critical Section is used since it does not block SoftDevice execution
|
|
taskENTER_CRITICAL();
|
|
#elif defined(NRF52_DISABLE_INT)
|
|
// If you are using the Bluetooth SoftDevice we advise you to not disable
|
|
// the interrupts. Disabling the interrupts even for short periods of time
|
|
// causes the SoftDevice to stop working.
|
|
// Disable the interrupts only in cases where you need high performance for
|
|
// the LEDs and if you are not using the EasyDMA feature.
|
|
__disable_irq();
|
|
#endif
|
|
|
|
uint32_t pinMask = 1UL << g_ADigitalPinMap[pin];
|
|
|
|
uint32_t CYCLES_X00 = CYCLES_800;
|
|
uint32_t CYCLES_X00_T1H = CYCLES_800_T1H;
|
|
uint32_t CYCLES_X00_T0H = CYCLES_800_T0H;
|
|
|
|
#ifdef NEO_KHZ400
|
|
if( !is800KHz )
|
|
{
|
|
CYCLES_X00 = CYCLES_400;
|
|
CYCLES_X00_T1H = CYCLES_400_T1H;
|
|
CYCLES_X00_T0H = CYCLES_400_T0H;
|
|
}
|
|
#endif
|
|
|
|
// Enable DWT in debug core
|
|
CoreDebug->DEMCR |= CoreDebug_DEMCR_TRCENA_Msk;
|
|
DWT->CTRL |= DWT_CTRL_CYCCNTENA_Msk;
|
|
|
|
// Tries to re-send the frame if is interrupted by the SoftDevice.
|
|
while(1) {
|
|
uint8_t *p = pixels;
|
|
|
|
uint32_t cycStart = DWT->CYCCNT;
|
|
uint32_t cyc = 0;
|
|
|
|
for(uint16_t n=0; n<numBytes; n++) {
|
|
uint8_t pix = *p++;
|
|
|
|
for(uint8_t mask = 0x80; mask; mask >>= 1) {
|
|
while(DWT->CYCCNT - cyc < CYCLES_X00);
|
|
cyc = DWT->CYCCNT;
|
|
|
|
NRF_GPIO->OUTSET |= pinMask;
|
|
|
|
if(pix & mask) {
|
|
while(DWT->CYCCNT - cyc < CYCLES_X00_T1H);
|
|
} else {
|
|
while(DWT->CYCCNT - cyc < CYCLES_X00_T0H);
|
|
}
|
|
|
|
NRF_GPIO->OUTCLR |= pinMask;
|
|
}
|
|
}
|
|
while(DWT->CYCCNT - cyc < CYCLES_X00);
|
|
|
|
|
|
// If total time longer than 25%, resend the whole data.
|
|
// Since we are likely to be interrupted by SoftDevice
|
|
if ( (DWT->CYCCNT - cycStart) < ( 8*numBytes*((CYCLES_X00*5)/4) ) ) {
|
|
break;
|
|
}
|
|
|
|
// re-send need 300us delay
|
|
delayMicroseconds(300);
|
|
}
|
|
|
|
// Enable interrupts again
|
|
#ifdef ARDUINO_FEATHER52
|
|
taskEXIT_CRITICAL();
|
|
#elif defined(NRF52_DISABLE_INT)
|
|
__enable_irq();
|
|
#endif
|
|
}
|
|
// END of NRF52 implementation
|
|
|
|
#elif defined (__SAMD21E17A__) || defined(__SAMD21G18A__) || defined(__SAMD21E18A__) || defined(__SAMD21J18A__) // Arduino Zero, Gemma/Trinket M0, SODAQ Autonomo and others
|
|
// Tried this with a timer/counter, couldn't quite get adequate
|
|
// resolution. So yay, you get a load of goofball NOPs...
|
|
|
|
uint8_t *ptr, *end, p, bitMask, portNum;
|
|
uint32_t pinMask;
|
|
|
|
portNum = g_APinDescription[pin].ulPort;
|
|
pinMask = 1ul << g_APinDescription[pin].ulPin;
|
|
ptr = pixels;
|
|
end = ptr + numBytes;
|
|
p = *ptr++;
|
|
bitMask = 0x80;
|
|
|
|
volatile uint32_t *set = &(PORT->Group[portNum].OUTSET.reg),
|
|
*clr = &(PORT->Group[portNum].OUTCLR.reg);
|
|
|
|
#ifdef NEO_KHZ400 // 800 KHz check needed only if 400 KHz support enabled
|
|
if(is800KHz) {
|
|
#endif
|
|
for(;;) {
|
|
*set = pinMask;
|
|
asm("nop; nop; nop; nop; nop; nop; nop; nop;");
|
|
if(p & bitMask) {
|
|
asm("nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop;");
|
|
*clr = pinMask;
|
|
} else {
|
|
*clr = pinMask;
|
|
asm("nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop;");
|
|
}
|
|
if(bitMask >>= 1) {
|
|
asm("nop; nop; nop; nop; nop; nop; nop; nop; nop;");
|
|
} else {
|
|
if(ptr >= end) break;
|
|
p = *ptr++;
|
|
bitMask = 0x80;
|
|
}
|
|
}
|
|
#ifdef NEO_KHZ400
|
|
} else { // 400 KHz bitstream
|
|
for(;;) {
|
|
*set = pinMask;
|
|
asm("nop; nop; nop; nop; nop; nop; nop; nop; nop; nop; nop;");
|
|
if(p & bitMask) {
|
|
asm("nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop;");
|
|
*clr = pinMask;
|
|
} else {
|
|
*clr = pinMask;
|
|
asm("nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop;");
|
|
}
|
|
asm("nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;");
|
|
if(bitMask >>= 1) {
|
|
asm("nop; nop; nop; nop; nop; nop; nop;");
|
|
} else {
|
|
if(ptr >= end) break;
|
|
p = *ptr++;
|
|
bitMask = 0x80;
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
#elif defined (__SAMD51__) // M4 @ 120mhz
|
|
// Tried this with a timer/counter, couldn't quite get adequate
|
|
// resolution. So yay, you get a load of goofball NOPs...
|
|
|
|
uint8_t *ptr, *end, p, bitMask, portNum;
|
|
uint32_t pinMask;
|
|
|
|
portNum = g_APinDescription[pin].ulPort;
|
|
pinMask = 1ul << g_APinDescription[pin].ulPin;
|
|
ptr = pixels;
|
|
end = ptr + numBytes;
|
|
p = *ptr++;
|
|
bitMask = 0x80;
|
|
|
|
volatile uint32_t *set = &(PORT->Group[portNum].OUTSET.reg),
|
|
*clr = &(PORT->Group[portNum].OUTCLR.reg);
|
|
|
|
#ifdef NEO_KHZ400 // 800 KHz check needed only if 400 KHz support enabled
|
|
if(is800KHz) {
|
|
#endif
|
|
for(;;) {
|
|
if(p & bitMask) { // ONE
|
|
// High 800ns
|
|
*set = pinMask;
|
|
asm("nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;");
|
|
// Low 450ns
|
|
*clr = pinMask;
|
|
asm("nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop;");
|
|
} else { // ZERO
|
|
// High 400ns
|
|
*set = pinMask;
|
|
asm("nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop;");
|
|
// Low 850ns
|
|
*clr = pinMask;
|
|
asm("nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;");
|
|
}
|
|
if(bitMask >>= 1) {
|
|
// Move on to the next pixel
|
|
asm("nop;");
|
|
} else {
|
|
if(ptr >= end) break;
|
|
p = *ptr++;
|
|
bitMask = 0x80;
|
|
}
|
|
}
|
|
#ifdef NEO_KHZ400
|
|
} else { // 400 KHz bitstream
|
|
// ToDo!
|
|
}
|
|
#endif
|
|
|
|
#elif defined (ARDUINO_STM32_FEATHER) // FEATHER WICED (120MHz)
|
|
|
|
// Tried this with a timer/counter, couldn't quite get adequate
|
|
// resolution. So yay, you get a load of goofball NOPs...
|
|
|
|
uint8_t *ptr, *end, p, bitMask;
|
|
uint32_t pinMask;
|
|
|
|
pinMask = BIT(PIN_MAP[pin].gpio_bit);
|
|
ptr = pixels;
|
|
end = ptr + numBytes;
|
|
p = *ptr++;
|
|
bitMask = 0x80;
|
|
|
|
volatile uint16_t *set = &(PIN_MAP[pin].gpio_device->regs->BSRRL);
|
|
volatile uint16_t *clr = &(PIN_MAP[pin].gpio_device->regs->BSRRH);
|
|
|
|
#ifdef NEO_KHZ400 // 800 KHz check needed only if 400 KHz support enabled
|
|
if(is800KHz) {
|
|
#endif
|
|
for(;;) {
|
|
if(p & bitMask) { // ONE
|
|
// High 800ns
|
|
*set = pinMask;
|
|
asm("nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop;");
|
|
// Low 450ns
|
|
*clr = pinMask;
|
|
asm("nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop;");
|
|
} else { // ZERO
|
|
// High 400ns
|
|
*set = pinMask;
|
|
asm("nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop;");
|
|
// Low 850ns
|
|
*clr = pinMask;
|
|
asm("nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop; nop; nop; nop; nop;"
|
|
"nop; nop; nop; nop;");
|
|
}
|
|
if(bitMask >>= 1) {
|
|
// Move on to the next pixel
|
|
asm("nop;");
|
|
} else {
|
|
if(ptr >= end) break;
|
|
p = *ptr++;
|
|
bitMask = 0x80;
|
|
}
|
|
}
|
|
#ifdef NEO_KHZ400
|
|
} else { // 400 KHz bitstream
|
|
// ToDo!
|
|
}
|
|
#endif
|
|
|
|
#else // Other ARM architecture -- Presumed Arduino Due
|
|
|
|
#define SCALE VARIANT_MCK / 2UL / 1000000UL
|
|
#define INST (2UL * F_CPU / VARIANT_MCK)
|
|
#define TIME_800_0 ((int)(0.40 * SCALE + 0.5) - (5 * INST))
|
|
#define TIME_800_1 ((int)(0.80 * SCALE + 0.5) - (5 * INST))
|
|
#define PERIOD_800 ((int)(1.25 * SCALE + 0.5) - (5 * INST))
|
|
#define TIME_400_0 ((int)(0.50 * SCALE + 0.5) - (5 * INST))
|
|
#define TIME_400_1 ((int)(1.20 * SCALE + 0.5) - (5 * INST))
|
|
#define PERIOD_400 ((int)(2.50 * SCALE + 0.5) - (5 * INST))
|
|
|
|
int pinMask, time0, time1, period, t;
|
|
Pio *port;
|
|
volatile WoReg *portSet, *portClear, *timeValue, *timeReset;
|
|
uint8_t *p, *end, pix, mask;
|
|
|
|
pmc_set_writeprotect(false);
|
|
pmc_enable_periph_clk((uint32_t)TC3_IRQn);
|
|
TC_Configure(TC1, 0,
|
|
TC_CMR_WAVE | TC_CMR_WAVSEL_UP | TC_CMR_TCCLKS_TIMER_CLOCK1);
|
|
TC_Start(TC1, 0);
|
|
|
|
pinMask = g_APinDescription[pin].ulPin; // Don't 'optimize' these into
|
|
port = g_APinDescription[pin].pPort; // declarations above. Want to
|
|
portSet = &(port->PIO_SODR); // burn a few cycles after
|
|
portClear = &(port->PIO_CODR); // starting timer to minimize
|
|
timeValue = &(TC1->TC_CHANNEL[0].TC_CV); // the initial 'while'.
|
|
timeReset = &(TC1->TC_CHANNEL[0].TC_CCR);
|
|
p = pixels;
|
|
end = p + numBytes;
|
|
pix = *p++;
|
|
mask = 0x80;
|
|
|
|
#ifdef NEO_KHZ400 // 800 KHz check needed only if 400 KHz support enabled
|
|
if(is800KHz) {
|
|
#endif
|
|
time0 = TIME_800_0;
|
|
time1 = TIME_800_1;
|
|
period = PERIOD_800;
|
|
#ifdef NEO_KHZ400
|
|
} else { // 400 KHz bitstream
|
|
time0 = TIME_400_0;
|
|
time1 = TIME_400_1;
|
|
period = PERIOD_400;
|
|
}
|
|
#endif
|
|
|
|
for(t = time0;; t = time0) {
|
|
if(pix & mask) t = time1;
|
|
while(*timeValue < period);
|
|
*portSet = pinMask;
|
|
*timeReset = TC_CCR_CLKEN | TC_CCR_SWTRG;
|
|
while(*timeValue < t);
|
|
*portClear = pinMask;
|
|
if(!(mask >>= 1)) { // This 'inside-out' loop logic utilizes
|
|
if(p >= end) break; // idle time to minimize inter-byte delays.
|
|
pix = *p++;
|
|
mask = 0x80;
|
|
}
|
|
}
|
|
while(*timeValue < period); // Wait for last bit
|
|
TC_Stop(TC1, 0);
|
|
|
|
#endif // end Due
|
|
|
|
// END ARM ----------------------------------------------------------------
|
|
|
|
|
|
#elif defined(ESP8266) || defined(ESP32)
|
|
|
|
// ESP8266 ----------------------------------------------------------------
|
|
|
|
// ESP8266 show() is external to enforce ICACHE_RAM_ATTR execution
|
|
espShow(pin, pixels, numBytes, is800KHz);
|
|
|
|
#elif defined(__ARDUINO_ARC__)
|
|
|
|
// Arduino 101 -----------------------------------------------------------
|
|
|
|
#define NOPx7 { __builtin_arc_nop(); \
|
|
__builtin_arc_nop(); __builtin_arc_nop(); \
|
|
__builtin_arc_nop(); __builtin_arc_nop(); \
|
|
__builtin_arc_nop(); __builtin_arc_nop(); }
|
|
|
|
PinDescription *pindesc = &g_APinDescription[pin];
|
|
register uint32_t loop = 8 * numBytes; // one loop to handle all bytes and all bits
|
|
register uint8_t *p = pixels;
|
|
register uint32_t currByte = (uint32_t) (*p);
|
|
register uint32_t currBit = 0x80 & currByte;
|
|
register uint32_t bitCounter = 0;
|
|
register uint32_t first = 1;
|
|
|
|
// The loop is unusual. Very first iteration puts all the way LOW to the wire -
|
|
// constant LOW does not affect NEOPIXEL, so there is no visible effect displayed.
|
|
// During that very first iteration CPU caches instructions in the loop.
|
|
// Because of the caching process, "CPU slows down". NEOPIXEL pulse is very time sensitive
|
|
// that's why we let the CPU cache first and we start regular pulse from 2nd iteration
|
|
if (pindesc->ulGPIOType == SS_GPIO) {
|
|
register uint32_t reg = pindesc->ulGPIOBase + SS_GPIO_SWPORTA_DR;
|
|
uint32_t reg_val = __builtin_arc_lr((volatile uint32_t)reg);
|
|
register uint32_t reg_bit_high = reg_val | (1 << pindesc->ulGPIOId);
|
|
register uint32_t reg_bit_low = reg_val & ~(1 << pindesc->ulGPIOId);
|
|
|
|
loop += 1; // include first, special iteration
|
|
while(loop--) {
|
|
if(!first) {
|
|
currByte <<= 1;
|
|
bitCounter++;
|
|
}
|
|
|
|
// 1 is >550ns high and >450ns low; 0 is 200..500ns high and >450ns low
|
|
__builtin_arc_sr(first ? reg_bit_low : reg_bit_high, (volatile uint32_t)reg);
|
|
if(currBit) { // ~400ns HIGH (740ns overall)
|
|
NOPx7
|
|
NOPx7
|
|
}
|
|
// ~340ns HIGH
|
|
NOPx7
|
|
__builtin_arc_nop();
|
|
|
|
// 820ns LOW; per spec, max allowed low here is 5000ns */
|
|
__builtin_arc_sr(reg_bit_low, (volatile uint32_t)reg);
|
|
NOPx7
|
|
NOPx7
|
|
|
|
if(bitCounter >= 8) {
|
|
bitCounter = 0;
|
|
currByte = (uint32_t) (*++p);
|
|
}
|
|
|
|
currBit = 0x80 & currByte;
|
|
first = 0;
|
|
}
|
|
} else if(pindesc->ulGPIOType == SOC_GPIO) {
|
|
register uint32_t reg = pindesc->ulGPIOBase + SOC_GPIO_SWPORTA_DR;
|
|
uint32_t reg_val = MMIO_REG_VAL(reg);
|
|
register uint32_t reg_bit_high = reg_val | (1 << pindesc->ulGPIOId);
|
|
register uint32_t reg_bit_low = reg_val & ~(1 << pindesc->ulGPIOId);
|
|
|
|
loop += 1; // include first, special iteration
|
|
while(loop--) {
|
|
if(!first) {
|
|
currByte <<= 1;
|
|
bitCounter++;
|
|
}
|
|
MMIO_REG_VAL(reg) = first ? reg_bit_low : reg_bit_high;
|
|
if(currBit) { // ~430ns HIGH (740ns overall)
|
|
NOPx7
|
|
NOPx7
|
|
__builtin_arc_nop();
|
|
}
|
|
// ~310ns HIGH
|
|
NOPx7
|
|
|
|
// 850ns LOW; per spec, max allowed low here is 5000ns */
|
|
MMIO_REG_VAL(reg) = reg_bit_low;
|
|
NOPx7
|
|
NOPx7
|
|
|
|
if(bitCounter >= 8) {
|
|
bitCounter = 0;
|
|
currByte = (uint32_t) (*++p);
|
|
}
|
|
|
|
currBit = 0x80 & currByte;
|
|
first = 0;
|
|
}
|
|
}
|
|
|
|
#else
|
|
#error Architecture not supported
|
|
#endif
|
|
|
|
|
|
// END ARCHITECTURE SELECT ------------------------------------------------
|
|
|
|
#ifndef NRF52
|
|
interrupts();
|
|
#endif
|
|
|
|
endTime = micros(); // Save EOD time for latch on next call
|
|
}
|
|
|
|
// Set the output pin number
|
|
void Adafruit_NeoPixel::setPin(uint8_t p) {
|
|
if(begun && (pin >= 0)) pinMode(pin, INPUT);
|
|
pin = p;
|
|
if(begun) {
|
|
pinMode(p, OUTPUT);
|
|
digitalWrite(p, LOW);
|
|
}
|
|
#ifdef __AVR__
|
|
port = portOutputRegister(digitalPinToPort(p));
|
|
pinMask = digitalPinToBitMask(p);
|
|
#endif
|
|
}
|
|
|
|
// Set pixel color from separate R,G,B components:
|
|
void Adafruit_NeoPixel::setPixelColor(
|
|
uint16_t n, uint8_t r, uint8_t g, uint8_t b) {
|
|
|
|
if(n < numLEDs) {
|
|
if(brightness) { // See notes in setBrightness()
|
|
r = (r * brightness) >> 8;
|
|
g = (g * brightness) >> 8;
|
|
b = (b * brightness) >> 8;
|
|
}
|
|
uint8_t *p;
|
|
if(wOffset == rOffset) { // Is an RGB-type strip
|
|
p = &pixels[n * 3]; // 3 bytes per pixel
|
|
} else { // Is a WRGB-type strip
|
|
p = &pixels[n * 4]; // 4 bytes per pixel
|
|
p[wOffset] = 0; // But only R,G,B passed -- set W to 0
|
|
}
|
|
p[rOffset] = r; // R,G,B always stored
|
|
p[gOffset] = g;
|
|
p[bOffset] = b;
|
|
}
|
|
}
|
|
|
|
void Adafruit_NeoPixel::setPixelColor(
|
|
uint16_t n, uint8_t r, uint8_t g, uint8_t b, uint8_t w) {
|
|
|
|
if(n < numLEDs) {
|
|
if(brightness) { // See notes in setBrightness()
|
|
r = (r * brightness) >> 8;
|
|
g = (g * brightness) >> 8;
|
|
b = (b * brightness) >> 8;
|
|
w = (w * brightness) >> 8;
|
|
}
|
|
uint8_t *p;
|
|
if(wOffset == rOffset) { // Is an RGB-type strip
|
|
p = &pixels[n * 3]; // 3 bytes per pixel (ignore W)
|
|
} else { // Is a WRGB-type strip
|
|
p = &pixels[n * 4]; // 4 bytes per pixel
|
|
p[wOffset] = w; // Store W
|
|
}
|
|
p[rOffset] = r; // Store R,G,B
|
|
p[gOffset] = g;
|
|
p[bOffset] = b;
|
|
}
|
|
}
|
|
|
|
// Set pixel color from 'packed' 32-bit RGB color:
|
|
void Adafruit_NeoPixel::setPixelColor(uint16_t n, uint32_t c) {
|
|
if(n < numLEDs) {
|
|
uint8_t *p,
|
|
r = (uint8_t)(c >> 16),
|
|
g = (uint8_t)(c >> 8),
|
|
b = (uint8_t)c;
|
|
if(brightness) { // See notes in setBrightness()
|
|
r = (r * brightness) >> 8;
|
|
g = (g * brightness) >> 8;
|
|
b = (b * brightness) >> 8;
|
|
}
|
|
if(wOffset == rOffset) {
|
|
p = &pixels[n * 3];
|
|
} else {
|
|
p = &pixels[n * 4];
|
|
uint8_t w = (uint8_t)(c >> 24);
|
|
p[wOffset] = brightness ? ((w * brightness) >> 8) : w;
|
|
}
|
|
p[rOffset] = r;
|
|
p[gOffset] = g;
|
|
p[bOffset] = b;
|
|
}
|
|
}
|
|
|
|
// Convert separate R,G,B into packed 32-bit RGB color.
|
|
// Packed format is always RGB, regardless of LED strand color order.
|
|
uint32_t Adafruit_NeoPixel::Color(uint8_t r, uint8_t g, uint8_t b) {
|
|
return ((uint32_t)r << 16) | ((uint32_t)g << 8) | b;
|
|
}
|
|
|
|
// Convert separate R,G,B,W into packed 32-bit WRGB color.
|
|
// Packed format is always WRGB, regardless of LED strand color order.
|
|
uint32_t Adafruit_NeoPixel::Color(uint8_t r, uint8_t g, uint8_t b, uint8_t w) {
|
|
return ((uint32_t)w << 24) | ((uint32_t)r << 16) | ((uint32_t)g << 8) | b;
|
|
}
|
|
|
|
// Query color from previously-set pixel (returns packed 32-bit RGB value)
|
|
uint32_t Adafruit_NeoPixel::getPixelColor(uint16_t n) const {
|
|
if(n >= numLEDs) return 0; // Out of bounds, return no color.
|
|
|
|
uint8_t *p;
|
|
|
|
if(wOffset == rOffset) { // Is RGB-type device
|
|
p = &pixels[n * 3];
|
|
if(brightness) {
|
|
// Stored color was decimated by setBrightness(). Returned value
|
|
// attempts to scale back to an approximation of the original 24-bit
|
|
// value used when setting the pixel color, but there will always be
|
|
// some error -- those bits are simply gone. Issue is most
|
|
// pronounced at low brightness levels.
|
|
return (((uint32_t)(p[rOffset] << 8) / brightness) << 16) |
|
|
(((uint32_t)(p[gOffset] << 8) / brightness) << 8) |
|
|
( (uint32_t)(p[bOffset] << 8) / brightness );
|
|
} else {
|
|
// No brightness adjustment has been made -- return 'raw' color
|
|
return ((uint32_t)p[rOffset] << 16) |
|
|
((uint32_t)p[gOffset] << 8) |
|
|
(uint32_t)p[bOffset];
|
|
}
|
|
} else { // Is RGBW-type device
|
|
p = &pixels[n * 4];
|
|
if(brightness) { // Return scaled color
|
|
return (((uint32_t)(p[wOffset] << 8) / brightness) << 24) |
|
|
(((uint32_t)(p[rOffset] << 8) / brightness) << 16) |
|
|
(((uint32_t)(p[gOffset] << 8) / brightness) << 8) |
|
|
( (uint32_t)(p[bOffset] << 8) / brightness );
|
|
} else { // Return raw color
|
|
return ((uint32_t)p[wOffset] << 24) |
|
|
((uint32_t)p[rOffset] << 16) |
|
|
((uint32_t)p[gOffset] << 8) |
|
|
(uint32_t)p[bOffset];
|
|
}
|
|
}
|
|
}
|
|
|
|
// Returns pointer to pixels[] array. Pixel data is stored in device-
|
|
// native format and is not translated here. Application will need to be
|
|
// aware of specific pixel data format and handle colors appropriately.
|
|
uint8_t *Adafruit_NeoPixel::getPixels(void) const {
|
|
return pixels;
|
|
}
|
|
|
|
uint16_t Adafruit_NeoPixel::numPixels(void) const {
|
|
return numLEDs;
|
|
}
|
|
|
|
// Adjust output brightness; 0=darkest (off), 255=brightest. This does
|
|
// NOT immediately affect what's currently displayed on the LEDs. The
|
|
// next call to show() will refresh the LEDs at this level. However,
|
|
// this process is potentially "lossy," especially when increasing
|
|
// brightness. The tight timing in the WS2811/WS2812 code means there
|
|
// aren't enough free cycles to perform this scaling on the fly as data
|
|
// is issued. So we make a pass through the existing color data in RAM
|
|
// and scale it (subsequent graphics commands also work at this
|
|
// brightness level). If there's a significant step up in brightness,
|
|
// the limited number of steps (quantization) in the old data will be
|
|
// quite visible in the re-scaled version. For a non-destructive
|
|
// change, you'll need to re-render the full strip data. C'est la vie.
|
|
void Adafruit_NeoPixel::setBrightness(uint8_t b) {
|
|
// Stored brightness value is different than what's passed.
|
|
// This simplifies the actual scaling math later, allowing a fast
|
|
// 8x8-bit multiply and taking the MSB. 'brightness' is a uint8_t,
|
|
// adding 1 here may (intentionally) roll over...so 0 = max brightness
|
|
// (color values are interpreted literally; no scaling), 1 = min
|
|
// brightness (off), 255 = just below max brightness.
|
|
uint8_t newBrightness = b + 1;
|
|
if(newBrightness != brightness) { // Compare against prior value
|
|
// Brightness has changed -- re-scale existing data in RAM
|
|
uint8_t c,
|
|
*ptr = pixels,
|
|
oldBrightness = brightness - 1; // De-wrap old brightness value
|
|
uint16_t scale;
|
|
if(oldBrightness == 0) scale = 0; // Avoid /0
|
|
else if(b == 255) scale = 65535 / oldBrightness;
|
|
else scale = (((uint16_t)newBrightness << 8) - 1) / oldBrightness;
|
|
for(uint16_t i=0; i<numBytes; i++) {
|
|
c = *ptr;
|
|
*ptr++ = (c * scale) >> 8;
|
|
}
|
|
brightness = newBrightness;
|
|
}
|
|
}
|
|
|
|
//Return the brightness value
|
|
uint8_t Adafruit_NeoPixel::getBrightness(void) const {
|
|
return brightness - 1;
|
|
}
|
|
|
|
void Adafruit_NeoPixel::clear() {
|
|
memset(pixels, 0, numBytes);
|
|
}
|