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stm32f0 discovery I2C not stable

Question asked by vadoud.ali on Aug 5, 2014
hello, I try to communicate with an eeprom and I was able to initialise I2C1, the eeprom acknoledges when I send the adress command and I am able to send data to the I2C but the data are not allways the same, some times they are right and some times, wrong and the when I use the stop command, the eeprom acknoledges the adressing command but I am not able to send any data. 
there is my full code:
/* Includes */
#include <stddef.h>
#include "stm32f0xx_rcc.h"
#include "stm32f0xx_gpio.h"
#include "stm32f0xx_i2c.h"
void set_I2C(void);
int i;
/* Private typedef */
/* Private define  */
/* Private macro */
/* Private variables */
/* Private function prototypes */
/* Private functions */
/* Global variables */
void set_I2C(void){
        GPIO_InitTypeDef GPIO_InitStructure;
        I2C_InitTypeDef I2C_InitStructure;
            RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);
        RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
        //Configure pins: SCL and SDA ------------------
        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
        GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
        GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
        GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
        GPIO_Init(GPIOB, &GPIO_InitStructure);
        GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_1);
                GPIO_PinAFConfig(GPIOB, GPIO_PinSource7, GPIO_AF_1);
        I2C_Cmd(I2C1, DISABLE);
        I2C_InitStructure.I2C_AnalogFilter = I2C_AnalogFilter_Enable;
       I2C_InitStructure.I2C_DigitalFilter = 0xff;
        I2C_InitStructure.I2C_OwnAddress1 = 0x00;
       I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
        I2C_InitStructure.I2C_Ack = I2C_Ack_Disable;
        I2C_InitStructure.I2C_Timing = 0xA0120227;
        //I2C_InitStructure.I2C_Timing = 0x20310A0D;
        //I2C_InitStructure.I2C_Timing =0xB0420F13;
    I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
        I2C_Init(I2C1, &I2C_InitStructure);
        I2C_Cmd(I2C1, ENABLE);
                I2C_ITConfig(I2C1, I2C_FLAG_TXE, ENABLE);
                    //I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;            // I2C mode
                    //I2C_InitStructure.I2C_OwnAddress1 = 0x00;         // own address, not relevant in master mode
                //  I2C_InitStructure.I2C_Ack = I2C_Ack_Disable;        // disable acknowledge when reading (can be changed later on)
                    //I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit; // set address length to 7 bit addresses
                    //I2C_Init(I2C1, &I2C_InitStructure);               // init I2C1
                    // enable I2C1
                    //I2C_Cmd(I2C1, ENABLE);
int main(void)
       I2C_SlaveAddressConfig(I2C1, 0b10100000);
I2C_GenerateSTART(I2C1, ENABLE);
I2C_GenerateSTOP(I2C1, ENABLE);