I2C - No data transfer

[thiagoDGIST]

Hi,

I2C peripheral has been initialize with STM32CubeMX. I am using I2C1, pins B9 (data) and B8 (clock). The device ‘s address is 0x60. For starter, I can neither read nor write to the 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 in 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 image shows the activity in the bus.

I also tried with an EEPROM (mine is a 24LC02B – I/P – 2Kbits) following the exact code on the book, without success.

Please, help me to find a solution for this problem.

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[thiagoDGIST]

PS: I am using STM32F4-Discovery

[thiagoDGIST]

I found the problem. The device I am using, a camera module OV9655, requires an input clock. I was using MCO1, with PLLCLK/4. When I checked the signal I saw that the output looked more like noise than an actual clock. Then, I changed it to output the clock from HSI and it worked.

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