I want to write and read data from M24M01-RMN6TP (EEPROM) by using STM32F427ZITx processor, please help me?

[Pawan Kumar sharma]

Posted on April 10, 2018 at 12:49

I DON'T KNOW ADDRESS OF M24M01-RMN6TP slave.

if((HAL_I2C_Master_Transmit(&hi2c1,(devAddess),(uint8_t *)&buffer,3,100))==HAL_OK)

{ HAL_GPIO_TogglePin(GPIOF,GPIO_PIN_4); HAL_Delay(200);}if((HAL_I2C_Master_Receive(&hi2c1,(devAddress),(uint8_t *)&buffer,3,100))==HAL_OK){ HAL_GPIO_TogglePin(GPIOF,GPIO_PIN_3); HAL_Delay(200);} }#m24m #m24m02 #eeprom-memory #hal #i2c

[john doe · Accepted solution]

Posted on April 10, 2018 at 15:02

HAL wants a 16 bit address shifted to the left.  try (uint16_t)(devAddress << 1) instead of (devAddress)

on the premise your EEPROM is configured to read at 0x50, the shifted address is 0xA0  - 0x50 << 1 is 0xA0

The code is very well commented.  Look in STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_i2c.c 

here's a code snippet to scan the I2C bus of a HAL project:

  printf('Scanning I2C bus:\r\n');  HAL_StatusTypeDef result;  uint8_t i;  for (i=1; i<128; i++)  {    /*     * the HAL wants a left aligned i2c address     * &hi2c1 is the handle     * (uint16_t)(i<<1) is the i2c address left aligned     * retries 2     * timeout 2     */    result = HAL_I2C_IsDeviceReady(&hi2c1, (uint16_t)(i<<1), 2, 2);    if (result != HAL_OK) // HAL_ERROR or HAL_BUSY or HAL_TIMEOUT    {            printf('.'); // No ACK received at that address    }    if (result == HAL_OK)    {            printf(' 0x%X ', i); // Received an ACK at that address    }  }  printf('\r\n');

[Pawan Kumar sharma]

Posted on April 11, 2018 at 08:39

Hi

doe.john.016

Thanks for your quick reply,It was very helpful for me.

pawan sharma

india