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602 lines
14 KiB
602 lines
14 KiB
/* Tone.cpp
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A Tone Generator Library
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Written by Brett Hagman
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library 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 GNU
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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 this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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Version Modified By Date Comments
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------- ----------- -------- --------
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0001 B Hagman 09/08/02 Initial coding
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0002 B Hagman 09/08/18 Multiple pins
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0003 B Hagman 09/08/18 Moved initialization from constructor to begin()
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0004 B Hagman 09/09/26 Fixed problems with ATmega8
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0005 B Hagman 09/11/23 Scanned prescalars for best fit on 8 bit timers
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09/11/25 Changed pin toggle method to XOR
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09/11/25 Fixed timer0 from being excluded
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0006 D Mellis 09/12/29 Replaced objects with functions
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0007 M Sproul 10/08/29 Changed #ifdefs from cpu to register
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*************************************************/
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#include <avr/interrupt.h>
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#include <avr/pgmspace.h>
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#include "wiring.h"
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#include "pins_arduino.h"
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#if defined(__AVR_ATmega8__) || defined(__AVR_ATmega128__)
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#define TCCR2A TCCR2
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#define TCCR2B TCCR2
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#define COM2A1 COM21
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#define COM2A0 COM20
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#define OCR2A OCR2
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#define TIMSK2 TIMSK
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#define OCIE2A OCIE2
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#define TIMER2_COMPA_vect TIMER2_COMP_vect
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#define TIMSK1 TIMSK
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#endif
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// timerx_toggle_count:
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// > 0 - duration specified
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// = 0 - stopped
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// < 0 - infinitely (until stop() method called, or new play() called)
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#if !defined(__AVR_ATmega8__)
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volatile long timer0_toggle_count;
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volatile uint8_t *timer0_pin_port;
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volatile uint8_t timer0_pin_mask;
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#endif
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volatile long timer1_toggle_count;
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volatile uint8_t *timer1_pin_port;
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volatile uint8_t timer1_pin_mask;
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volatile long timer2_toggle_count;
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volatile uint8_t *timer2_pin_port;
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volatile uint8_t timer2_pin_mask;
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#if defined(TIMSK3)
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volatile long timer3_toggle_count;
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volatile uint8_t *timer3_pin_port;
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volatile uint8_t timer3_pin_mask;
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#endif
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#if defined(TIMSK4)
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volatile long timer4_toggle_count;
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volatile uint8_t *timer4_pin_port;
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volatile uint8_t timer4_pin_mask;
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#endif
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#if defined(TIMSK5)
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volatile long timer5_toggle_count;
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volatile uint8_t *timer5_pin_port;
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volatile uint8_t timer5_pin_mask;
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#endif
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// MLS: This does not make sense, the 3 options are the same
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#if defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
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#define AVAILABLE_TONE_PINS 1
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const uint8_t PROGMEM tone_pin_to_timer_PGM[] = { 2 /*, 3, 4, 5, 1, 0 */ };
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static uint8_t tone_pins[AVAILABLE_TONE_PINS] = { 255 /*, 255, 255, 255, 255, 255 */ };
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#elif defined(__AVR_ATmega8__)
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#define AVAILABLE_TONE_PINS 1
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const uint8_t PROGMEM tone_pin_to_timer_PGM[] = { 2 /*, 1 */ };
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static uint8_t tone_pins[AVAILABLE_TONE_PINS] = { 255 /*, 255 */ };
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#else
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#define AVAILABLE_TONE_PINS 1
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// Leave timer 0 to last.
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const uint8_t PROGMEM tone_pin_to_timer_PGM[] = { 2 /*, 1, 0 */ };
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static uint8_t tone_pins[AVAILABLE_TONE_PINS] = { 255 /*, 255, 255 */ };
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#endif
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static int8_t toneBegin(uint8_t _pin)
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{
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int8_t _timer = -1;
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// if we're already using the pin, the timer should be configured.
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for (int i = 0; i < AVAILABLE_TONE_PINS; i++) {
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if (tone_pins[i] == _pin) {
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return pgm_read_byte(tone_pin_to_timer_PGM + i);
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}
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}
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// search for an unused timer.
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for (int i = 0; i < AVAILABLE_TONE_PINS; i++) {
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if (tone_pins[i] == 255) {
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tone_pins[i] = _pin;
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_timer = pgm_read_byte(tone_pin_to_timer_PGM + i);
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break;
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}
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}
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if (_timer != -1)
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{
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// Set timer specific stuff
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// All timers in CTC mode
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// 8 bit timers will require changing prescalar values,
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// whereas 16 bit timers are set to either ck/1 or ck/64 prescalar
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switch (_timer)
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{
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#if defined(TCCR0A) && defined(TCCR0B)
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case 0:
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// 8 bit timer
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TCCR0A = 0;
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TCCR0B = 0;
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bitWrite(TCCR0A, WGM01, 1);
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bitWrite(TCCR0B, CS00, 1);
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timer0_pin_port = portOutputRegister(digitalPinToPort(_pin));
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timer0_pin_mask = digitalPinToBitMask(_pin);
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break;
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#endif
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#if defined(TCCR1A) && defined(TCCR1B) && defined(WGM12)
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case 1:
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// 16 bit timer
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TCCR1A = 0;
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TCCR1B = 0;
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bitWrite(TCCR1B, WGM12, 1);
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bitWrite(TCCR1B, CS10, 1);
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timer1_pin_port = portOutputRegister(digitalPinToPort(_pin));
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timer1_pin_mask = digitalPinToBitMask(_pin);
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break;
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#endif
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#if defined(TCCR2A) && defined(TCCR2B)
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case 2:
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// 8 bit timer
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TCCR2A = 0;
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TCCR2B = 0;
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bitWrite(TCCR2A, WGM21, 1);
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bitWrite(TCCR2B, CS20, 1);
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timer2_pin_port = portOutputRegister(digitalPinToPort(_pin));
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timer2_pin_mask = digitalPinToBitMask(_pin);
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break;
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#endif
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#if defined(TCCR3A) && defined(TCCR3B) && defined(TIMSK3)
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case 3:
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// 16 bit timer
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TCCR3A = 0;
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TCCR3B = 0;
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bitWrite(TCCR3B, WGM32, 1);
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bitWrite(TCCR3B, CS30, 1);
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timer3_pin_port = portOutputRegister(digitalPinToPort(_pin));
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timer3_pin_mask = digitalPinToBitMask(_pin);
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break;
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#endif
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#if defined(TCCR4A) && defined(TCCR4B) && defined(TIMSK4)
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case 4:
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// 16 bit timer
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TCCR4A = 0;
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TCCR4B = 0;
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#if defined(WGM42)
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bitWrite(TCCR4B, WGM42, 1);
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#elif defined(CS43)
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#warning this may not be correct
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// atmega32u4
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bitWrite(TCCR4B, CS43, 1);
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#endif
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bitWrite(TCCR4B, CS40, 1);
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timer4_pin_port = portOutputRegister(digitalPinToPort(_pin));
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timer4_pin_mask = digitalPinToBitMask(_pin);
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break;
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#endif
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#if defined(TCCR5A) && defined(TCCR5B) && defined(TIMSK5)
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case 5:
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// 16 bit timer
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TCCR5A = 0;
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TCCR5B = 0;
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bitWrite(TCCR5B, WGM52, 1);
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bitWrite(TCCR5B, CS50, 1);
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timer5_pin_port = portOutputRegister(digitalPinToPort(_pin));
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timer5_pin_mask = digitalPinToBitMask(_pin);
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break;
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#endif
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}
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}
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return _timer;
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}
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// frequency (in hertz) and duration (in milliseconds).
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void tone(uint8_t _pin, unsigned int frequency, unsigned long duration)
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{
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uint8_t prescalarbits = 0b001;
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long toggle_count = 0;
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uint32_t ocr = 0;
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int8_t _timer;
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_timer = toneBegin(_pin);
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if (_timer >= 0)
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{
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// Set the pinMode as OUTPUT
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pinMode(_pin, OUTPUT);
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// if we are using an 8 bit timer, scan through prescalars to find the best fit
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if (_timer == 0 || _timer == 2)
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{
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ocr = F_CPU / frequency / 2 - 1;
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prescalarbits = 0b001; // ck/1: same for both timers
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if (ocr > 255)
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{
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ocr = F_CPU / frequency / 2 / 8 - 1;
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prescalarbits = 0b010; // ck/8: same for both timers
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if (_timer == 2 && ocr > 255)
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{
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ocr = F_CPU / frequency / 2 / 32 - 1;
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prescalarbits = 0b011;
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}
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if (ocr > 255)
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{
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ocr = F_CPU / frequency / 2 / 64 - 1;
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prescalarbits = _timer == 0 ? 0b011 : 0b100;
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if (_timer == 2 && ocr > 255)
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{
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ocr = F_CPU / frequency / 2 / 128 - 1;
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prescalarbits = 0b101;
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}
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if (ocr > 255)
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{
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ocr = F_CPU / frequency / 2 / 256 - 1;
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prescalarbits = _timer == 0 ? 0b100 : 0b110;
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if (ocr > 255)
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{
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// can't do any better than /1024
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ocr = F_CPU / frequency / 2 / 1024 - 1;
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prescalarbits = _timer == 0 ? 0b101 : 0b111;
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}
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}
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}
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}
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#if defined(TCCR0B)
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if (_timer == 0)
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{
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TCCR0B = prescalarbits;
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}
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else
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#endif
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#if defined(TCCR2B)
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{
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TCCR2B = prescalarbits;
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}
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#else
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{
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// dummy place holder to make the above ifdefs work
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}
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#endif
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}
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else
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{
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// two choices for the 16 bit timers: ck/1 or ck/64
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ocr = F_CPU / frequency / 2 - 1;
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prescalarbits = 0b001;
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if (ocr > 0xffff)
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{
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ocr = F_CPU / frequency / 2 / 64 - 1;
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prescalarbits = 0b011;
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}
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if (_timer == 1)
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{
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#if defined(TCCR1B)
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TCCR1B = (TCCR1B & 0b11111000) | prescalarbits;
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#endif
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}
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#if defined(TCCR3B)
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else if (_timer == 3)
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TCCR3B = (TCCR3B & 0b11111000) | prescalarbits;
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#endif
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#if defined(TCCR4B)
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else if (_timer == 4)
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TCCR4B = (TCCR4B & 0b11111000) | prescalarbits;
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#endif
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#if defined(TCCR5B)
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else if (_timer == 5)
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TCCR5B = (TCCR5B & 0b11111000) | prescalarbits;
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#endif
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}
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// Calculate the toggle count
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if (duration > 0)
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{
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toggle_count = 2 * frequency * duration / 1000;
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}
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else
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{
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toggle_count = -1;
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}
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// Set the OCR for the given timer,
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// set the toggle count,
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// then turn on the interrupts
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switch (_timer)
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{
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#if defined(OCR0A) && defined(TIMSK0) && defined(OCIE0A)
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case 0:
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OCR0A = ocr;
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timer0_toggle_count = toggle_count;
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bitWrite(TIMSK0, OCIE0A, 1);
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break;
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#endif
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case 1:
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#if defined(OCR1A) && defined(TIMSK1) && defined(OCIE1A)
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OCR1A = ocr;
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timer1_toggle_count = toggle_count;
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bitWrite(TIMSK1, OCIE1A, 1);
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#elif defined(OCR1A) && defined(TIMSK) && defined(OCIE1A)
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// this combination is for at least the ATmega32
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OCR1A = ocr;
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timer1_toggle_count = toggle_count;
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bitWrite(TIMSK, OCIE1A, 1);
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#endif
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break;
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#if defined(OCR2A) && defined(TIMSK2) && defined(OCIE2A)
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case 2:
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OCR2A = ocr;
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timer2_toggle_count = toggle_count;
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bitWrite(TIMSK2, OCIE2A, 1);
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break;
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#endif
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#if defined(TIMSK3)
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case 3:
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OCR3A = ocr;
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timer3_toggle_count = toggle_count;
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bitWrite(TIMSK3, OCIE3A, 1);
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break;
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#endif
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#if defined(TIMSK4)
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case 4:
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OCR4A = ocr;
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timer4_toggle_count = toggle_count;
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bitWrite(TIMSK4, OCIE4A, 1);
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break;
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#endif
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#if defined(OCR5A) && defined(TIMSK5) && defined(OCIE5A)
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case 5:
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OCR5A = ocr;
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timer5_toggle_count = toggle_count;
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bitWrite(TIMSK5, OCIE5A, 1);
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break;
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#endif
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}
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}
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}
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// XXX: this function only works properly for timer 2 (the only one we use
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// currently). for the others, it should end the tone, but won't restore
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// proper PWM functionality for the timer.
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void disableTimer(uint8_t _timer)
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{
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switch (_timer)
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{
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case 0:
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#if defined(TIMSK0)
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TIMSK0 = 0;
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#elif defined(TIMSK)
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TIMSK = 0; // atmega32
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#endif
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break;
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#if defined(TIMSK1) && defined(OCIE1A)
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case 1:
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bitWrite(TIMSK1, OCIE1A, 0);
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break;
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#endif
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case 2:
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#if defined(TIMSK2) && defined(OCIE2A)
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bitWrite(TIMSK2, OCIE2A, 0); // disable interrupt
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#endif
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#if defined(TCCR2A) && defined(WGM20)
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TCCR2A = (1 << WGM20);
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#endif
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#if defined(TCCR2B) && defined(CS22)
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TCCR2B = (TCCR2B & 0b11111000) | (1 << CS22);
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#endif
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#if defined(OCR2A)
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OCR2A = 0;
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#endif
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break;
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#if defined(TIMSK3)
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case 3:
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TIMSK3 = 0;
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break;
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#endif
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#if defined(TIMSK4)
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case 4:
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TIMSK4 = 0;
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break;
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#endif
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#if defined(TIMSK5)
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case 5:
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TIMSK5 = 0;
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break;
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#endif
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}
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}
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void noTone(uint8_t _pin)
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{
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int8_t _timer = -1;
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for (int i = 0; i < AVAILABLE_TONE_PINS; i++) {
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if (tone_pins[i] == _pin) {
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_timer = pgm_read_byte(tone_pin_to_timer_PGM + i);
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tone_pins[i] = 255;
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}
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}
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disableTimer(_timer);
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digitalWrite(_pin, 0);
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}
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#if 0
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#if !defined(__AVR_ATmega8__)
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ISR(TIMER0_COMPA_vect)
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{
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if (timer0_toggle_count != 0)
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{
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// toggle the pin
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*timer0_pin_port ^= timer0_pin_mask;
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if (timer0_toggle_count > 0)
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timer0_toggle_count--;
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}
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else
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{
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disableTimer(0);
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*timer0_pin_port &= ~(timer0_pin_mask); // keep pin low after stop
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}
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}
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#endif
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ISR(TIMER1_COMPA_vect)
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{
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if (timer1_toggle_count != 0)
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{
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// toggle the pin
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*timer1_pin_port ^= timer1_pin_mask;
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if (timer1_toggle_count > 0)
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timer1_toggle_count--;
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}
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else
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{
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disableTimer(1);
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*timer1_pin_port &= ~(timer1_pin_mask); // keep pin low after stop
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}
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}
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#endif
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ISR(TIMER2_COMPA_vect)
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{
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if (timer2_toggle_count != 0)
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{
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// toggle the pin
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*timer2_pin_port ^= timer2_pin_mask;
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if (timer2_toggle_count > 0)
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timer2_toggle_count--;
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}
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else
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{
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// need to call noTone() so that the tone_pins[] entry is reset, so the
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// timer gets initialized next time we call tone().
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// XXX: this assumes timer 2 is always the first one used.
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noTone(tone_pins[0]);
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// disableTimer(2);
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// *timer2_pin_port &= ~(timer2_pin_mask); // keep pin low after stop
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}
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}
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//#if defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
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#if 0
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ISR(TIMER3_COMPA_vect)
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{
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if (timer3_toggle_count != 0)
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{
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// toggle the pin
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*timer3_pin_port ^= timer3_pin_mask;
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if (timer3_toggle_count > 0)
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timer3_toggle_count--;
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}
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else
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{
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disableTimer(3);
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*timer3_pin_port &= ~(timer3_pin_mask); // keep pin low after stop
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}
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}
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ISR(TIMER4_COMPA_vect)
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{
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if (timer4_toggle_count != 0)
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{
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// toggle the pin
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*timer4_pin_port ^= timer4_pin_mask;
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if (timer4_toggle_count > 0)
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timer4_toggle_count--;
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}
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else
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{
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disableTimer(4);
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*timer4_pin_port &= ~(timer4_pin_mask); // keep pin low after stop
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}
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}
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ISR(TIMER5_COMPA_vect)
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{
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if (timer5_toggle_count != 0)
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{
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// toggle the pin
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*timer5_pin_port ^= timer5_pin_mask;
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if (timer5_toggle_count > 0)
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timer5_toggle_count--;
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}
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else
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{
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disableTimer(5);
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*timer5_pin_port &= ~(timer5_pin_mask); // keep pin low after stop
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}
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}
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#endif
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