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发表于 2014-4-27 20:54:10
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我贴一段硬件的STM32的程序,已验证通过的。
/*
²Ù×÷¶ÔÏóΪһ24C256
*/
#include "stm32f10x.h"
#define EEPROM_ADDR 0xA0
#define I2C_PAGESIZE 64 //24C256Ò³»º³åÊÇ64¸ö
void I2C_Configuration(void)
{
I2C_InitTypeDef I2C_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1,ENABLE);
/* PB6,7 SCL and 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(I2C1);
I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
I2C_InitStructure.I2C_OwnAddress1 = 0x30;
I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_InitStructure.I2C_ClockSpeed = 200000;//200KËÙ¶È
I2C_Cmd(I2C1, ENABLE);
I2C_Init(I2C1, &I2C_InitStructure);
/*ÔÊÐí1×Ö½Ú1Ó¦´ðģʽ*/
I2C_AcknowledgeConfig(I2C1, ENABLE);
}
/***************************************************
**º¯ÊýÃû:I2C_ReadS
**¹¦ÄÜ:¶ÁÈ¡24C256¶à¸ö×Ö½Ú
**×¢ÒâÊÂÏî:24C256,16λµØÖ·,A0-A2¹Ì¶¨Îª0,´ÓÆ÷¼þµØַΪEEPROM_ADDR
***************************************************/
void I2C_ReadS_24C(u16 addr ,u8* pBuffer,u16 no)
{
if(no==0)
return;
while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY));
/*ÔÊÐí1×Ö½Ú1Ó¦´ðģʽ*/
I2C_AcknowledgeConfig(I2C1, ENABLE);
/* ·¢ËÍÆðʼλ */
I2C_GenerateSTART(I2C1, ENABLE);
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));/*EV5,Ö÷ģʽ*/
/*·¢ËÍÆ÷¼þµØÖ·(д)*/
I2C_Send7bitAddress(I2C1, EEPROM_ADDR, I2C_Direction_Transmitter);
while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
/*·¢Ë͵ØÖ·*/
I2C_SendData(I2C1, (u8)(addr>>8));
while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));/*Êý¾Ý1ÒÑ·¢ËÍ*/
I2C_SendData(I2C1, (u8)addr);
while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));/*Êý¾Ý2ÒÑ·¢ËÍ*/
/*Æðʼλ*/
I2C_GenerateSTART(I2C1, ENABLE);
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
/*Æ÷¼þ¶Á*/
I2C_Send7bitAddress(I2C1, EEPROM_ADDR, I2C_Direction_Receiver);
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));
while (no)
{
if(no==1)
{
I2C_AcknowledgeConfig(I2C1, DISABLE); //×îºóһλºóÒª¹Ø±ÕÓ¦´ðµÄ
I2C_GenerateSTOP(I2C1, ENABLE); //·¢ËÍֹͣλ
}
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED)); /* EV7 */
*pBuffer = I2C_ReceiveData(I2C1);
pBuffer++;
/* Decrement the read bytes counter */
no--;
}
//ÔÙ´ÎÔÊÐíÓ¦´ðģʽ
I2C_AcknowledgeConfig(I2C1, ENABLE);
}
/****************************************************
**º¯ÊýÃû:I2C_Standby_24C
**¹¦ÄÜ:24CÊÇ·ñ×¼±¸ºÃÔÙдÈëµÄÅжÏ
**×¢ÒâÊÂÏî:±¾º¯Êý¿ÉÒÔÀí½âΪ:ÅÐæ
****************************************************/
void I2C_Standby_24C(void)
{
vu16 SR1_Tmp;
do
{
/*Æðʼλ*/
I2C_GenerateSTART(I2C1, ENABLE);
/*¶ÁSR1*/
SR1_Tmp = I2C_ReadRegister(I2C1, I2C_Register_SR1);
/*Æ÷¼þµØÖ·(д)*/
I2C_Send7bitAddress(I2C1, EEPROM_ADDR, I2C_Direction_Transmitter);
}while(!(I2C_ReadRegister(I2C1, I2C_Register_SR1) & 0x0002));
/**/
I2C_ClearFlag(I2C1, I2C_FLAG_AF);
/*ֹͣλ*/
I2C_GenerateSTOP(I2C1, ENABLE);
}
/*************************************************
**º¯ÊýÃû:I2C_ByteWrite_24C
**¹¦ÄÜ:дһ¸ö×Ö½Ú
**×¢ÒâÊÂÏî:×ÖдÈëͬÑùÐèÒªµ÷ÓÃæÅжÏ
*************************************************/
void I2C_ByteWrite_24C(u16 addr,u8 dat)
{
while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY)); //iiiii
/* Æðʼλ */
I2C_GenerateSTART(I2C1, ENABLE);
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
/* ·¢ËÍÆ÷¼þµØÖ·(д)*/
I2C_Send7bitAddress(I2C1, EEPROM_ADDR, I2C_Direction_Transmitter);
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
/*·¢Ë͵ØÖ·*/
I2C_SendData(I2C1, (u8)(addr>>8));
while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));/*Êý¾Ý1ÒÑ·¢ËÍ*/
I2C_SendData(I2C1, (u8)addr);
while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));/*Êý¾Ý2ÒÑ·¢ËÍ*/
/* дһ¸ö×Ö½Ú*/
I2C_SendData(I2C1, dat);
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
/* ֹͣλ*/
I2C_GenerateSTOP(I2C1, ENABLE);
I2C_Standby_24C();
}
/*************************************************
**º¯ÊýÃû:I2C_PageWrite_24C
**¹¦ÄÜ:дÈëÒ»Ò³(ÒÔÄÚ)
**×¢ÒâÊÂÏî:´Ëº¯Êý¹©ÈºÐ´Èëµ÷ÓÃ
*************************************************/
void I2C_PageWrite_24C(u16 addr,u8* pBuffer, u8 no)
{
while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY));
/*Æðʼλ*/
I2C_GenerateSTART(I2C1, ENABLE);
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
/*Æ÷¼þµØÖ·(д)*/
I2C_Send7bitAddress(I2C1, EEPROM_ADDR, I2C_Direction_Transmitter);
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
/*дµØÖ·Öµ*/
I2C_SendData(I2C1, (u8)(addr>>8));
while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));/*Êý¾Ý1ÒÑ·¢ËÍ*/
I2C_SendData(I2C1, (u8)addr);
while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));/*Êý¾Ý2ÒÑ·¢ËÍ*/
while(no--)
{
I2C_SendData(I2C1, *pBuffer);
pBuffer++;
while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
}
/*ֹͣλ*/
I2C_GenerateSTOP(I2C1, ENABLE);
I2C_Standby_24C();//IIIIIII
}
/*************************************************
**º¯ÊýÃû:I2C_WriteS_24C
**¹¦ÄÜ:ҳдÈë24C
**×¢ÒâÊÂÏî:24C256×î¶àÔÊÐíÒ»´ÎдÈë64¸ö×Ö½Ú
*************************************************/
void I2C_WriteS_24C(u16 addr,u8* pBuffer, u16 no)
{
u8 temp;
//1.ÏÈ°ÑÒ³²»¶ÔÆëµÄ²¿·ÖдÈë
temp=addr % I2C_PAGESIZE;
if(temp)
{
temp=I2C_PAGESIZE-temp;
I2C_PageWrite_24C(addr,pBuffer, temp);
no-=temp;
addr+=temp;
pBuffer+=temp;
I2C_Standby_24C();
}
//2.´ÓÒ³¶ÔÆ뿪ʼд
while(no)
{
if(no>=I2C_PAGESIZE)
{
I2C_PageWrite_24C(addr,pBuffer, I2C_PAGESIZE);
no-=I2C_PAGESIZE;
addr+=I2C_PAGESIZE;
pBuffer+=I2C_PAGESIZE;
I2C_Standby_24C();
}
else
{
I2C_PageWrite_24C(addr,pBuffer, no);
no=0;
I2C_Standby_24C();
}
}
}
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