/i2c.c

//***************************************************************************//**
//EEPROM LIB v 1.0
//******************************************************************************/
#include "stm32f10x_gpio.h"
#include "stm32f10x_i2c.h"
#include "stm32f10x_rcc.h"

//#define I2C_FLASH_PAGESIZE     32 //not used yet
#define EEPROM_HW_ADDRESS      0xA0   /* E0 = E1 = E2 = 0 */
#define I2C_EE             I2C1//interface number

void Delay_ms(uint32_t ms);

/***************************************************************************//**
 *  @brief  I2C Configuration
 ******************************************************************************/
void I2C_Configuration(void)
{

   	   I2C_InitTypeDef  I2C_InitStructure;
	   GPIO_InitTypeDef  GPIO_InitStructure;

	   RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1,ENABLE);

	   RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB| RCC_APB2Periph_AFIO , ENABLE);//

	   /* Configure I2C1 pins: PB6->SCL and PB7->SDA */
	   GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_6 | GPIO_Pin_7;
	   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
	   GPIO_Init(GPIOB, &GPIO_InitStructure);

	   I2C_DeInit(I2C_EE);
	   I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
	   I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_16_9;
	   I2C_InitStructure.I2C_OwnAddress1 = 1;
	   I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
	   I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
	   I2C_InitStructure.I2C_ClockSpeed = 100000;  /* 100kHz */

	   I2C_Cmd(I2C_EE, ENABLE);
	   I2C_Init(I2C_EE, &I2C_InitStructure);
	   I2C_AcknowledgeConfig(I2C_EE, ENABLE);

}

//*******************************************************************8
//***************************************************************

void I2C_EE_ByteWrite(uint8_t val, uint16_t WriteAddr)
{


    /* Send START condition */
    I2C_GenerateSTART(I2C_EE, ENABLE);

    /* Test on EV5 and clear it */
    while(!I2C_CheckEvent(I2C_EE, I2C_EVENT_MASTER_MODE_SELECT));

    /* Send EEPROM address for write */
    I2C_Send7bitAddress(I2C_EE, EEPROM_HW_ADDRESS, I2C_Direction_Transmitter);

    /* Test on EV6 and clear it */
    while(!I2C_CheckEvent(I2C_EE, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));


    /* Send the EEPROM's internal address to write to : MSB of the address first */
    I2C_SendData(I2C_EE, (uint8_t)((WriteAddr & 0xFF00) >> 8));

    /* Test on EV8 and clear it */
    while(!I2C_CheckEvent(I2C_EE, I2C_EVENT_MASTER_BYTE_TRANSMITTED));



    /* Send the EEPROM's internal address to write to : LSB of the address */
    I2C_SendData(I2C_EE, (uint8_t)(WriteAddr & 0x00FF));

    /* Test on EV8 and clear it */
    while(! I2C_CheckEvent(I2C_EE, I2C_EVENT_MASTER_BYTE_TRANSMITTED));


     I2C_SendData(I2C_EE, val);

        /* Test on EV8 and clear it */
    while (!I2C_CheckEvent(I2C_EE, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

    /* Send STOP condition */
    I2C_GenerateSTOP(I2C_EE, ENABLE);

    //delay between write and read...not less 4ms
    Delay_ms(5);
}
//*********************************************************************************
uint8_t I2C_EE_ByteRead( uint16_t ReadAddr)
{
    uint8_t tmp;

	/* While the bus is busy */
    while(I2C_GetFlagStatus(I2C_EE, I2C_FLAG_BUSY));

    /* Send START condition */
    I2C_GenerateSTART(I2C_EE, ENABLE);

    /* Test on EV5 and clear it */
    while(!I2C_CheckEvent(I2C_EE, I2C_EVENT_MASTER_MODE_SELECT));

    /* Send EEPROM address for write */
    I2C_Send7bitAddress(I2C_EE, EEPROM_HW_ADDRESS, I2C_Direction_Transmitter);

    /* Test on EV6 and clear it */
    while(!I2C_CheckEvent(I2C_EE, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));


    /* Send the EEPROM's internal address to read from: MSB of the address first */
    I2C_SendData(I2C_EE, (uint8_t)((ReadAddr & 0xFF00) >> 8));

    /* Test on EV8 and clear it */
    while(!I2C_CheckEvent(I2C_EE, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

    /* Send the EEPROM's internal address to read from: LSB of the address */
    I2C_SendData(I2C_EE, (uint8_t)(ReadAddr & 0x00FF));

    /* Test on EV8 and clear it */
    while(!I2C_CheckEvent(I2C_EE, I2C_EVENT_MASTER_BYTE_TRANSMITTED));


    /* Send STRAT condition a second time */
    I2C_GenerateSTART(I2C_EE, ENABLE);

    /* Test on EV5 and clear it */
    while(!I2C_CheckEvent(I2C_EE, I2C_EVENT_MASTER_MODE_SELECT));

    /* Send EEPROM address for read */
    I2C_Send7bitAddress(I2C_EE, EEPROM_HW_ADDRESS, I2C_Direction_Receiver);

    /* Test on EV6 and clear it */
    while(!I2C_CheckEvent(I2C_EE,I2C_EVENT_MASTER_BYTE_RECEIVED));//I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));

    tmp=I2C_ReceiveData(I2C_EE);


    I2C_AcknowledgeConfig(I2C_EE, DISABLE);

    /* Send STOP Condition */
    I2C_GenerateSTOP(I2C_EE, ENABLE);

    return tmp;
    }
//*******************************************************************************
void Delay_ms(uint32_t ms)
{
        volatile uint32_t nCount;
        RCC_ClocksTypeDef RCC_Clocks;
    RCC_GetClocksFreq (&RCC_Clocks);

        nCount=(RCC_Clocks.HCLK_Frequency/10000)*ms;
        for (; nCount!=0; nCount--);
}
//*****************************************************************************