diff options
author | David Hoelscher <[email protected]> | 2024-01-17 07:05:38 -0600 |
---|---|---|
committer | GitHub <[email protected]> | 2024-01-17 14:05:38 +0100 |
commit | e9bd7d7ad308f9c72c86863bf9f19382c7e2d892 (patch) | |
tree | c46ce87aaa57b8f49dc0a2b56527f0bc606038ab /platforms/avr/drivers/i2c_master.c | |
parent | 2b0965944d9065daa65cd25540cf2dd007f23eda (diff) | |
download | qmk_firmware-e9bd7d7ad308f9c72c86863bf9f19382c7e2d892.tar.gz qmk_firmware-e9bd7d7ad308f9c72c86863bf9f19382c7e2d892.zip |
I2C driver cleanup (#21273)
* remove i2c_start and i2c_stop from i2c drivers
* remove static i2c_address variable from chibios i2c driver
Diffstat (limited to 'platforms/avr/drivers/i2c_master.c')
-rw-r--r-- | platforms/avr/drivers/i2c_master.c | 31 |
1 files changed, 25 insertions, 6 deletions
diff --git a/platforms/avr/drivers/i2c_master.c b/platforms/avr/drivers/i2c_master.c index 0183103707..64083d862a 100644 --- a/platforms/avr/drivers/i2c_master.c +++ b/platforms/avr/drivers/i2c_master.c @@ -24,6 +24,7 @@ #include "timer.h" #include "wait.h" #include "util.h" +#include "progmem.h" #ifndef F_SCL # define F_SCL 400000UL // SCL frequency @@ -38,7 +39,7 @@ #define TWBR_val (((F_CPU / F_SCL) - 16) / 2) -void i2c_init(void) { +__attribute__((weak)) void i2c_init(void) { TWSR = 0; /* no prescaler */ TWBR = (uint8_t)TWBR_val; @@ -94,7 +95,7 @@ static i2c_status_t i2c_start_impl(uint8_t address, uint16_t timeout) { return I2C_STATUS_SUCCESS; } -i2c_status_t i2c_start(uint8_t address, uint16_t timeout) { +__attribute__((always_inline)) static inline i2c_status_t i2c_start(uint8_t address, uint16_t timeout) { // Retry i2c_start_impl a bunch times in case the remote side has interrupts disabled. uint16_t timeout_timer = timer_read(); uint16_t time_slice = MAX(1, (timeout == (I2C_TIMEOUT_INFINITE)) ? 5 : (timeout / (I2C_START_RETRY_COUNT))); // if it's infinite, wait 1ms between attempts, otherwise split up the entire timeout into the number of retries @@ -105,6 +106,11 @@ i2c_status_t i2c_start(uint8_t address, uint16_t timeout) { return status; } +__attribute__((always_inline)) static inline void i2c_stop(void) { + // transmit STOP condition + TWCR = (1 << TWINT) | (1 << TWEN) | (1 << TWSTO); +} + i2c_status_t i2c_write(uint8_t data, uint16_t timeout) { // load data into data register TWDR = data; @@ -167,6 +173,18 @@ i2c_status_t i2c_transmit(uint8_t address, const uint8_t* data, uint16_t length, return status; } +i2c_status_t i2c_transmit_P(uint8_t address, const uint8_t* data, uint16_t length, uint16_t timeout) { + i2c_status_t status = i2c_start(address | I2C_ACTION_WRITE, timeout); + + for (uint16_t i = 0; i < length && status >= 0; i++) { + status = i2c_write(pgm_read_byte((const char*)data++), timeout); + } + + i2c_stop(); + + return status; +} + i2c_status_t i2c_receive(uint8_t address, uint8_t* data, uint16_t length, uint16_t timeout) { i2c_status_t status = i2c_start(address | I2C_ACTION_READ, timeout); @@ -293,7 +311,8 @@ error: return (status < 0) ? status : I2C_STATUS_SUCCESS; } -void i2c_stop(void) { - // transmit STOP condition - TWCR = (1 << TWINT) | (1 << TWEN) | (1 << TWSTO); -} +__attribute__((weak)) i2c_status_t i2c_ping_address(uint8_t address, uint16_t timeout) { + i2c_status_t status = i2c_start(address, timeout); + i2c_stop(); + return status; +}
\ No newline at end of file |