diff options
Diffstat (limited to 'drivers/arm/i2c_master.c')
| -rw-r--r-- | drivers/arm/i2c_master.c | 26 |
1 files changed, 16 insertions, 10 deletions
diff --git a/drivers/arm/i2c_master.c b/drivers/arm/i2c_master.c index 2fdd9f65e..385bd97cb 100644 --- a/drivers/arm/i2c_master.c +++ b/drivers/arm/i2c_master.c @@ -15,21 +15,24 @@ * along with this program. If not, see <http://www.gnu.org/licenses/>. */ -/* This library follows the convention of the AVR i2c_master library. +/* This library is only valid for STM32 processors. + * This library follows the convention of the AVR i2c_master library. * As a result addresses are expected to be already shifted (addr << 1). * I2CD1 is the default driver which corresponds to pins B6 and B7. This * can be changed. * Please ensure that HAL_USE_I2C is TRUE in the halconf.h file and that - * STM32_I2C_USE_I2C1 is TRUE in the mcuconf.h file. + * STM32_I2C_USE_I2C1 is TRUE in the mcuconf.h file. Pins B6 and B7 are used + * but using any other I2C pins should be trivial. */ #include "i2c_master.h" +#include "quantum.h" #include <string.h> #include <hal.h> static uint8_t i2c_address; -// This configures the I2C clock to 400Mhz assuming a 72Mhz clock +// This configures the I2C clock to 400khz assuming a 72Mhz clock // For more info : https://www.st.com/en/embedded-software/stsw-stm32126.html static const I2CConfig i2cconfig = { STM32_TIMINGR_PRESC(15U) | @@ -39,13 +42,17 @@ static const I2CConfig i2cconfig = { 0 }; +__attribute__ ((weak)) void i2c_init(void) { - palSetGroupMode(GPIOB,6,7, PAL_MODE_INPUT); // Try releasing special pins for a short time - chThdSleepMilliseconds(10); + // Try releasing special pins for a short time + palSetPadMode(GPIOB, 6, PAL_MODE_INPUT); + palSetPadMode(GPIOB, 7, PAL_MODE_INPUT); - palSetPadMode(GPIOB, 6, PAL_MODE_ALTERNATE(4) | PAL_STM32_OTYPE_OPENDRAIN | PAL_STM32_PUPDR_PULLUP); - palSetPadMode(GPIOB, 7, PAL_MODE_ALTERNATE(4) | PAL_STM32_OTYPE_OPENDRAIN | PAL_STM32_PUPDR_PULLUP); + chThdSleepMilliseconds(10); + + palSetPadMode(GPIOB, 6, PAL_MODE_ALTERNATE(4) | PAL_STM32_OTYPE_OPENDRAIN); + palSetPadMode(GPIOB, 7, PAL_MODE_ALTERNATE(4) | PAL_STM32_OTYPE_OPENDRAIN); //i2cInit(); //This is invoked by halInit() so no need to redo it. } @@ -82,12 +89,12 @@ uint8_t i2c_writeReg(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16_t l { complete_packet[i+1] = data[i]; } - complete_packet[0] = regaddr + complete_packet[0] = regaddr; return i2cMasterTransmitTimeout(&I2C_DRIVER, (i2c_address >> 1), complete_packet, length + 1, 0, 0, MS2ST(timeout)); } -uint8_t i2c_readReg(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16_t length, uint16_t timeout) +uint8_t i2c_readReg(uint8_t devaddr, uint8_t* regaddr, uint8_t* data, uint16_t length, uint16_t timeout) { i2c_address = devaddr; i2cStart(&I2C_DRIVER, &i2cconfig); @@ -97,7 +104,6 @@ uint8_t i2c_readReg(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16_t le // This is usually not needed. It releases the driver to allow pins to become GPIO again. uint8_t i2c_stop(uint16_t timeout) { - i2c_address = address; i2cStop(&I2C_DRIVER); return 0; } |