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STM32L-Discovery communicate in I2C with M24LR64

Question asked by lopez.olivier on Apr 24, 2012
Latest reply on Jan 7, 2015 by Amel N
Hello everybody,

I have some troubel to communicate with m24LR64. I use a STM32L- Discovery.
I try to see something in the oscilloscope but nothing, could you help me to see what is wrong in my code:

#define I2C2_SLAVE_ADDRESS7     0xA0   // EEPROM I2C Address
#define ClockSpeed              200000 // 200 KHz
#include "mainsee.h"

void I2Cmain(void)
{

GPIO_InitTypeDef GPIO_InitStructure;
I2C_InitTypeDef  I2C_InitStructure;
       
  /* I2C1 and I2C2 Periph clock enable */
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C2, ENABLE);

  /* GPIOB Periph clock enable */
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);
 
  /* Configure I2C2 pins: SCL and SDA ----------------------------------------*/
  GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_10 | GPIO_Pin_11;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_40MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_Init(GPIOB, &GPIO_InitStructure);
  GPIO_PinAFConfig(GPIOB, GPIO_Pin_10, GPIO_AF_I2C2);
  GPIO_PinAFConfig(GPIOB, GPIO_Pin_11, GPIO_AF_I2C2);

  //I2C_DeInit(I2C2);    
           
  /* I2C2 configuration ------------------------------------------------------*/
  I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
  I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
  I2C_InitStructure.I2C_OwnAddress1 = I2C2_SLAVE_ADDRESS7;
  I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
  I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
  I2C_InitStructure.I2C_ClockSpeed = ClockSpeed;
  I2C_Init(I2C2, &I2C_InitStructure);

  /* Enable I2C2 -------------------------------------------------------------*/
  I2C_Cmd(I2C2, ENABLE);


  /* Send I2C1 START condition */
  I2C_GenerateSTART(I2C2, ENABLE);

  /* Test on I2C1 EV5 and clear it */
 // while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_MODE_SELECT));

   /* Send EEPROM slave Address for write */
  //I2C_Send7bitAddress(I2C2, I2C2_SLAVE_ADDRESS7, I2C_Direction_Transmitter);  }

  /* Test on I2C1 EV6 and clear it */
 // while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
 while(1){
  /* Send I2C1 EEPROM internal address */
  I2C_SendData(I2C2, 0x00);   }

  /* Test on I2C1 EV8 and clear it */
  while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

  /* Send I2C1 EEPROM data */
  I2C_SendData(I2C2, 0x05);

  /* Test on I2C1 EV8 and clear it */
  while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

  /* Send I2C1 STOP Condition */
  I2C_GenerateSTOP(I2C2, ENABLE);

  while(1); // Do not exit

}

Thank you very much in advance to help me.
P.S: Sorry for the english, i'm French.

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