STM32F7 I2C

[Koen]

Hello,

as anyone successfully used I2C with an STM32F7 ? I haven't found tests or demos of it and have tried to debug my try for hours now. Here's a condensed version of it :



Code: Select all

int main(void) {

   halInit();

   chSysInit();

   palSetPadMode(GPIOB, 8, PAL_MODE_ALTERNATE(4) | PAL_MODE_OUTPUT_OPENDRAIN);
   palSetPadMode(GPIOB, 9, PAL_MODE_ALTERNATE(4) | PAL_MODE_OUTPUT_OPENDRAIN);

   i2cInit();

   const I2CConfig i2cd1_cfg = {
      .timingr    = 0x40912732,
      .cr1       = 0,
      .cr2      = 0
   };

   i2cStart(&I2CD1, &i2cd1_cfg);

   msg_t       i2c_result;
   i2cflags_t   i2c_errors;
   uint8_t    i2c_rxbuf[129],
            i2c_txbuf[129];

   memset(i2c_txbuf, 0, sizeof(i2c_txbuf));

   i2cAcquireBus(&I2CD1);

   i2c_result = i2cMasterTransmitTimeout(&I2CD1, 0x37, i2c_txbuf, sizeof(i2c_txbuf), i2c_rxbuf, sizeof(i2c_rxbuf), MS2ST(1000));

   if(i2c_result != MSG_OK)
      i2c_errors = i2cGetErrors(&I2CD1);

   (void) i2c_errors;

   i2cReleaseBus(&I2CD1);

   i2cStop(&I2CD1);

   while (true) {

      chThdSleepMilliseconds(500);

   }

}



Defines modified from defaults :



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#define HAL_USE_I2C            TRUE
#define STM32_I2C_USE_I2C1 TRUE
#define STM32_I2C_USE_DMA FALSE



Results :



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i2c_result = -1 / MSG_RESET,
i2c_errors = 0



Is there anything obviously wrong ? I wrote the equivalent with STM32CubeHAL to make sure the hardware isn't at fault and it works.

Thank you,
Koen

[Giovanni]

Hi,

I haven't tested that driver on the F7 yet, there could be an error (likely in the registry if there is an error).

Giovanni

[steved]

I've successfully used the I2C on the F7 Disco in master mode (and, I think, in slave mode - can't remember for sure)

Some of my code is here

And I've just uploaded a specific example which worked for me

(Note that I was working with my modified driver which also handles slave mode, but I don't think I had to change any of the master-related code, except that there was a bug in the master code for transfers >255 bytes which is fixed in SVN)

[Koen]

Well, sorry to have wasted your time. I2C does work. I had commented

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#if (HAL_USE_PAL == TRUE) || defined(__DOXYGEN__)
  //palInit(&pal_default_config);
#endif

to reduce the test-case and concentrate on the two I2C pins only. I only discovered much later that palInit was also responsible for enabling the GPIO clocks.