Solved
I2C always falls into HAL_I2C_ERROR_AF
Posted on December 20, 2017 at 13:04
#i2c-addressing
Hi, everyone.
I2C peripheral has been initialized with STM32CubeMX according to the picture bellow:
I am using I2C1, pins B9 (data) and B8 (clock) in STM32F4 - Discovery. The device�s address is 0x60 (Says the datasheet). I am using pull-up (8 KOhm) and conflict protection resistors
(1.2 KOhm)
.I can neither read nor write to the slave device. I�ve tried the two following ways:1)
uint8_t outputData = 0;
HAL_I2C_Mem_Read(&hi2c1, 0x60, 0x0A, I2C_MEMADD_SIZE_8BIT, &outputData, 1, HAL_MAX_DELAY);
2)
uint8_t outputData = 0;
HAL_StatusTypeDef returnValue = 0;
returnValue = HAL_I2C_Master_Transmit(&hi2c1, 0x60, (uint8_t*)0x0A, 1, HAL_MAX_DELAY);
if(returnValue != HAL_OK) return returnValue;
returnValue = HAL_I2C_Master_Receive(&hi2c1, 0x60, &outputData, 1, HAL_MAX_DELAY);
These functions always falls into the following �if� block:
/* Send Slave Address and Memory Address */
if(I2C_RequestMemoryRead(hi2c, DevAddress, MemAddress, MemAddSize, Timeout, tickstart) != HAL_OK)
{
if(hi2c->ErrorCode == HAL_I2C_ERROR_AF)
{
/* Process Unlocked */
__HAL_UNLOCK(hi2c);
return HAL_ERROR;
}
The next picture shows the activity in the I2C bus:
#i2c-addressing