[MINI51] mini51学习第四贴 IIC

 

/**   

  ******************************************************************************

  * @file    EEPROM_24LC64.c

  * @author  NuMicro MCU Software Team

  * @version V1.01

  * @date    7. Dec 2011

  * @brief   Õâ¸öµµ°¸Ìṩ¶Áд24LC64 EEPROMËùÐèÈÍÌ幦ÄÜ.

  ******************************************************************************

  * @copyright

  *

  * Copyright (c) 2011 ÐÂÌƿƼ¼

  

  */

#include <stdio.h>

#include "MINI51.h"

#include "DrvGPIO.h"

#include "DrvSYS.h"

#include "DrvI2C.h"

/**   

  * @brief д³öÒ»¸öλԪ×é×ÊÁϵ½Ö¸¶¨µÄλַ

  * @param address ҪдµÄλַ

  * @param data  ÒªÐ´ÈëµÄ×ÊÁÏ

  * @return -

  */

void Write_24LC64(uint32_t address, uint8_t data)

{

    uint32_t i;

   // SystemCoreClock = DrvSYS_GetHCLKFreq();

    

    /* ´ò¿ªI2CÇÒÉ趨ʱÖÓËÙ¶ÈΪ100Kbsp    */

    DrvI2C_Open(100000);

    /* ´«ËÍI2C START ѶºÅ    */

    DrvI2C_Ctrl(1, 0, 0, 0);    

    while ( DrvI2C_GetIntFlag ( ) == 0);//while (I2C->CON_BITS.SI == 0);

    

    /* ËͳöwriteÃüÁî    */

    DrvI2C_WriteData (0xA0);//I2C->DATA = 0xA0;    

    DrvI2C_Ctrl(0, 0, 1, 0); 

    while ( DrvI2C_GetIntFlag ( ) == 0);//while (I2C->CON_BITS.SI == 0);

    

    /* Ëͳö¸ßλԪλַ    */

    I2C->DATA = (address >> 8) & 0XFF;

    DrvI2C_Ctrl(0, 0, 1, 1); 

    while (I2C->CON_BITS.SI == 0);

    

    /* ËͳöµÍλԪλַ    */

    I2C->DATA = address & 0XFF;

    DrvI2C_Ctrl(0, 0, 1, 1); 

    while (I2C->CON_BITS.SI == 0);

    

    /* ´«ËÍ×ÊÁÏ    */

    I2C->DATA = data;

    DrvI2C_Ctrl(0, 0, 1, 1);

    while (I2C->CON_BITS.SI == 0);

    

    /* ´«ËÍI2C STOPѶºÅ    */

    DrvI2C_Ctrl(0, 1, 1, 0);

    while (I2C->CON_BITS.STOP== 1);

    

    /* ¹Ø±ÕI2C    */

    DrvI2C_Close();

    for (i = 0;i < 120000;i++);    

}

/**   

  * @brief ´ÓÖ¸¶¨µÄλַ¶ÁÈ¡Ò»¸öλԪ×é×ÊÁÏ

  * @param address Òª¶ÁµÄλַ  

  * @return »Ø´«¶Áµ½µÄ×ÊÁÏ  

  */

uint8_t Read_24LC64(uint32_t address)

{

    uint8_t TEMP;

        

    //SystemCoreClock = DrvSYS_GetHCLKFreq();

    

    /* ´ò¿ªI2CÇÒÉ趨ʱÖÓËÙ¶ÈΪ100Kbsp    */

    DrvI2C_Open(100000);

    

    /* ´«ËÍI2C START ѶºÅ    */

    DrvI2C_Ctrl(1, 0, 1, 0);        

    while (I2C->CON_BITS.SI == 0);  

    /* ËͳöwriteÃüÁî    */

    I2C->DATA = 0XA0;

    DrvI2C_Ctrl(0, 0, 1, 0);       

    while (I2C->CON_BITS.SI == 0); 

    /* Ëͳö¸ßλԪλַ    */

    I2C->DATA = (address >> 8) & 0XFF;

    DrvI2C_Ctrl(0, 0, 1, 1);

    while (I2C->CON_BITS.SI == 0);

    /* ËͳöµÍλԪλַ    */

    I2C->DATA = address & 0XFF;

    DrvI2C_Ctrl(0, 0, 1, 0);    

    while (I2C->CON_BITS.SI == 0);

    /* ´«ËÍI2C STOPѶºÅ    */

    DrvI2C_Ctrl(0, 1, 1, 0); 

    while (I2C->CON_BITS.STOP == 1);

    /* ´«ËÍI2C RESTART ѶºÅ    */

    DrvI2C_Ctrl(1, 0, 1, 0);      

    while (I2C->CON_BITS.SI == 0);

    /* ËͳöreadÃüÁî    */

    I2C->DATA = 0XA1;

    DrvI2C_Ctrl(0, 0, 1, 1); 

    while (I2C->CON_BITS.SI == 0); 

    /* ¶ÁÈ¡×ÊÁÏ    */

    I2C->DATA = 0XFF;

    DrvI2C_Ctrl(0, 0, 1, 0);   

    while (I2C->CON_BITS.SI == 0);

    TEMP = I2C->DATA;

    

    /* ´«ËÍI2C STOPѶºÅ    */

    DrvI2C_Ctrl(0, 1, 1, 0);    

    while (I2C->CON_BITS.STOP == 1);

    

    /* ¹Ø±ÕI2C    */

    DrvI2C_Close();

    return TEMP;

}