Next set of split_common changes (#4974)
* Update split_common to use standard i2c drivers * Eliminate RGB_DIRTY/BACKLIT_DIRTY * Fix avr i2c_master error handling * Fix i2c_slave addressing * Remove unneeded timeout on i2c_stop() * Fix RGB I2C transfers * Remove incorrect commentpull/5387/head
James Churchill
5 years ago
committed by
Drashna Jaelre
parent
25bb059e4e
commit
37932c293c
@ -1,184 +0,0 @@
|
||||
#include <util/twi.h>
|
||||
#include <avr/io.h>
|
||||
#include <stdlib.h>
|
||||
#include <avr/interrupt.h>
|
||||
#include <util/twi.h>
|
||||
#include <stdbool.h>
|
||||
#include "i2c.h"
|
||||
#include "split_flags.h"
|
||||
|
||||
// Limits the amount of we wait for any one i2c transaction.
|
||||
// Since were running SCL line 100kHz (=> 10μs/bit), and each transactions is
|
||||
// 9 bits, a single transaction will take around 90μs to complete.
|
||||
//
|
||||
// (F_CPU/SCL_CLOCK) => # of μC cycles to transfer a bit
|
||||
// poll loop takes at least 8 clock cycles to execute
|
||||
#define I2C_LOOP_TIMEOUT (9+1)*(F_CPU/SCL_CLOCK)/8
|
||||
|
||||
#define BUFFER_POS_INC() (slave_buffer_pos = (slave_buffer_pos+1)%SLAVE_BUFFER_SIZE)
|
||||
|
||||
volatile uint8_t i2c_slave_buffer[SLAVE_BUFFER_SIZE];
|
||||
|
||||
static volatile uint8_t slave_buffer_pos;
|
||||
static volatile bool slave_has_register_set = false;
|
||||
|
||||
// Wait for an i2c operation to finish
|
||||
inline static
|
||||
void i2c_delay(void) {
|
||||
uint16_t lim = 0;
|
||||
while(!(TWCR & (1<<TWINT)) && lim < I2C_LOOP_TIMEOUT)
|
||||
lim++;
|
||||
|
||||
// easier way, but will wait slightly longer
|
||||
// _delay_us(100);
|
||||
}
|
||||
|
||||
// Setup twi to run at 100kHz
|
||||
void i2c_master_init(void) {
|
||||
// no prescaler
|
||||
TWSR = 0;
|
||||
// Set TWI clock frequency to SCL_CLOCK. Need TWBR>10.
|
||||
// Check datasheets for more info.
|
||||
TWBR = ((F_CPU/SCL_CLOCK)-16)/2;
|
||||
}
|
||||
|
||||
// Start a transaction with the given i2c slave address. The direction of the
|
||||
// transfer is set with I2C_READ and I2C_WRITE.
|
||||
// returns: 0 => success
|
||||
// 1 => error
|
||||
uint8_t i2c_master_start(uint8_t address) {
|
||||
TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWSTA);
|
||||
|
||||
i2c_delay();
|
||||
|
||||
// check that we started successfully
|
||||
if ( (TW_STATUS != TW_START) && (TW_STATUS != TW_REP_START))
|
||||
return 1;
|
||||
|
||||
TWDR = address;
|
||||
TWCR = (1<<TWINT) | (1<<TWEN);
|
||||
|
||||
i2c_delay();
|
||||
|
||||
if ( (TW_STATUS != TW_MT_SLA_ACK) && (TW_STATUS != TW_MR_SLA_ACK) )
|
||||
return 1; // slave did not acknowledge
|
||||
else
|
||||
return 0; // success
|
||||
}
|
||||
|
||||
|
||||
// Finish the i2c transaction.
|
||||
void i2c_master_stop(void) {
|
||||
TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWSTO);
|
||||
|
||||
uint16_t lim = 0;
|
||||
while(!(TWCR & (1<<TWSTO)) && lim < I2C_LOOP_TIMEOUT)
|
||||
lim++;
|
||||
}
|
||||
|
||||
// Write one byte to the i2c slave.
|
||||
// returns 0 => slave ACK
|
||||
// 1 => slave NACK
|
||||
uint8_t i2c_master_write(uint8_t data) {
|
||||
TWDR = data;
|
||||
TWCR = (1<<TWINT) | (1<<TWEN);
|
||||
|
||||
i2c_delay();
|
||||
|
||||
// check if the slave acknowledged us
|
||||
return (TW_STATUS == TW_MT_DATA_ACK) ? 0 : 1;
|
||||
}
|
||||
|
||||
uint8_t i2c_master_write_data(void *const TXdata, uint8_t dataLen) {
|
||||
|
||||
uint8_t *data = (uint8_t *)TXdata;
|
||||
int err = 0;
|
||||
|
||||
for (int i = 0; i < dataLen; i++) {
|
||||
err = i2c_master_write(data[i]);
|
||||
|
||||
if ( err )
|
||||
return err;
|
||||
}
|
||||
|
||||
return err;
|
||||
|
||||
}
|
||||
|
||||
// Read one byte from the i2c slave. If ack=1 the slave is acknowledged,
|
||||
// if ack=0 the acknowledge bit is not set.
|
||||
// returns: byte read from i2c device
|
||||
uint8_t i2c_master_read(int ack) {
|
||||
TWCR = (1<<TWINT) | (1<<TWEN) | (ack<<TWEA);
|
||||
|
||||
i2c_delay();
|
||||
return TWDR;
|
||||
}
|
||||
|
||||
void i2c_reset_state(void) {
|
||||
TWCR = 0;
|
||||
}
|
||||
|
||||
void i2c_slave_init(uint8_t address) {
|
||||
TWAR = address << 0; // slave i2c address
|
||||
// TWEN - twi enable
|
||||
// TWEA - enable address acknowledgement
|
||||
// TWINT - twi interrupt flag
|
||||
// TWIE - enable the twi interrupt
|
||||
TWCR = (1<<TWIE) | (1<<TWEA) | (1<<TWINT) | (1<<TWEN);
|
||||
}
|
||||
|
||||
ISR(TWI_vect);
|
||||
|
||||
ISR(TWI_vect) {
|
||||
uint8_t ack = 1;
|
||||
switch(TW_STATUS) {
|
||||
case TW_SR_SLA_ACK:
|
||||
// this device has been addressed as a slave receiver
|
||||
slave_has_register_set = false;
|
||||
break;
|
||||
|
||||
case TW_SR_DATA_ACK:
|
||||
// this device has received data as a slave receiver
|
||||
// The first byte that we receive in this transaction sets the location
|
||||
// of the read/write location of the slaves memory that it exposes over
|
||||
// i2c. After that, bytes will be written at slave_buffer_pos, incrementing
|
||||
// slave_buffer_pos after each write.
|
||||
if(!slave_has_register_set) {
|
||||
slave_buffer_pos = TWDR;
|
||||
// don't acknowledge the master if this memory loctaion is out of bounds
|
||||
if ( slave_buffer_pos >= SLAVE_BUFFER_SIZE ) {
|
||||
ack = 0;
|
||||
slave_buffer_pos = 0;
|
||||
}
|
||||
|
||||
slave_has_register_set = true;
|
||||
} else {
|
||||
i2c_slave_buffer[slave_buffer_pos] = TWDR;
|
||||
|
||||
if ( slave_buffer_pos == I2C_BACKLIT_START) {
|
||||
BACKLIT_DIRTY = true;
|
||||
} else if ( slave_buffer_pos == (I2C_RGB_START+3)) {
|
||||
RGB_DIRTY = true;
|
||||
}
|
||||
|
||||
BUFFER_POS_INC();
|
||||
}
|
||||
break;
|
||||
|
||||
case TW_ST_SLA_ACK:
|
||||
case TW_ST_DATA_ACK:
|
||||
// master has addressed this device as a slave transmitter and is
|
||||
// requesting data.
|
||||
TWDR = i2c_slave_buffer[slave_buffer_pos];
|
||||
BUFFER_POS_INC();
|
||||
break;
|
||||
|
||||
case TW_BUS_ERROR: // something went wrong, reset twi state
|
||||
TWCR = 0;
|
||||
default:
|
||||
break;
|
||||
}
|
||||
// Reset everything, so we are ready for the next TWI interrupt
|
||||
TWCR |= (1<<TWIE) | (1<<TWINT) | (ack<<TWEA) | (1<<TWEN);
|
||||
}
|
||||
@ -1,59 +0,0 @@
|
||||
#pragma once
|
||||
|
||||
#include <stdint.h>
|
||||
|
||||
#ifndef F_CPU
|
||||
#define F_CPU 16000000UL
|
||||
#endif
|
||||
|
||||
#define I2C_READ 1
|
||||
#define I2C_WRITE 0
|
||||
|
||||
#define I2C_ACK 1
|
||||
#define I2C_NACK 0
|
||||
|
||||
// Address location defines (Keymap should be last, as it's size is dynamic)
|
||||
#define I2C_BACKLIT_START 0x00
|
||||
// Need 4 bytes for RGB (32 bit)
|
||||
#define I2C_RGB_START 0x01
|
||||
#define I2C_KEYMAP_START 0x06
|
||||
|
||||
// Slave buffer (8bit per)
|
||||
// Rows per hand + backlit space + rgb space
|
||||
// TODO : Make this dynamically sized
|
||||
#define SLAVE_BUFFER_SIZE 0x20
|
||||
|
||||
// i2c SCL clock frequency
|
||||
#ifndef SCL_CLOCK
|
||||
#define SCL_CLOCK 100000L
|
||||
#endif
|
||||
|
||||
// Support 8bits right now (8 cols) will need to edit to take higher (code exists in delta split?)
|
||||
extern volatile uint8_t i2c_slave_buffer[SLAVE_BUFFER_SIZE];
|
||||
|
||||
void i2c_master_init(void);
|
||||
uint8_t i2c_master_start(uint8_t address);
|
||||
void i2c_master_stop(void);
|
||||
uint8_t i2c_master_write(uint8_t data);
|
||||
uint8_t i2c_master_write_data(void *const TXdata, uint8_t dataLen);
|
||||
uint8_t i2c_master_read(int);
|
||||
void i2c_reset_state(void);
|
||||
void i2c_slave_init(uint8_t address);
|
||||
|
||||
|
||||
static inline unsigned char i2c_start_read(unsigned char addr) {
|
||||
return i2c_master_start((addr << 1) | I2C_READ);
|
||||
}
|
||||
|
||||
static inline unsigned char i2c_start_write(unsigned char addr) {
|
||||
return i2c_master_start((addr << 1) | I2C_WRITE);
|
||||
}
|
||||
|
||||
// from SSD1306 scrips
|
||||
extern unsigned char i2c_rep_start(unsigned char addr);
|
||||
extern void i2c_start_wait(unsigned char addr);
|
||||
extern unsigned char i2c_readAck(void);
|
||||
extern unsigned char i2c_readNak(void);
|
||||
extern unsigned char i2c_read(unsigned char ack);
|
||||
|
||||
#define i2c_read(ack) (ack) ? i2c_readAck() : i2c_readNak();
|
||||
@ -1,5 +0,0 @@
|
||||
#include "split_flags.h"
|
||||
|
||||
volatile bool RGB_DIRTY = false;
|
||||
|
||||
volatile bool BACKLIT_DIRTY = false;
|
||||
@ -1,15 +0,0 @@
|
||||
#pragma once
|
||||
|
||||
#include <stdbool.h>
|
||||
#include <stdint.h>
|
||||
|
||||
/**
|
||||
* Global Flags
|
||||
**/
|
||||
|
||||
//RGB Stuff
|
||||
extern volatile bool RGB_DIRTY;
|
||||
|
||||
|
||||
//Backlight Stuff
|
||||
extern volatile bool BACKLIT_DIRTY;
|
||||
Loading…
Reference in new issue