STM32 的I2C 硬使用

操作对象为一24C02
*/

#include "STM32Lib\\stm32f10x.h"
#include "hal.h"

//#define AT24C01A//24C01A,I2C时序和往后的24C02一样
#define AT24C01//24C01,I2C的时序和普通的有点不同

#define EEPROM_ADDR0xA0
#define I2C_PAGESIZE4//24C01/01A页缓冲是4个

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 = 100000;//100K速度

I2C_Cmd(I2C1, ENABLE);
I2C_Init(I2C1, &I2C_InitStructure);
/*允许1字节1应答模式*/
I2C_AcknowledgeConfig(I2C1, ENABLE);

}

/***************************************************
**函数名:I2C_ReadS
**功能:读取24C02多个字节
**注意事项:24C02是256字节,8位地址,A0-A2固定为0,从器件地址为EEPROM_ADDR
***************************************************/
void I2C_ReadS_24C(u8 addr ,u8* pBuffer,u16 no)
{
if(no==0)
return;

while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY));

/*允许1字节1应答模式*/
I2C_AcknowledgeConfig(I2C1, ENABLE);

/* 发送起始位 */
I2C_GenerateSTART(I2C1, ENABLE);
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));/*EV5,主模式*/

#ifdef AT24C01A
/*发送器件地址(写)*/
I2C_Send7bitAddress(I2C1, EEPROM_ADDR, I2C_Direction_Transmitter);
while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));

/*发送地址*/
I2C_SendData(I2C1, addr);
while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));/*数据已发送*/

/*起始位*/
I2C_GenerateSTART(I2C1, ENABLE);
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));

/*器件读*/
I2C_Send7bitAddress(I2C1, EEPROM_ADDR, I2C_Direction_Receiver);
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));

#else
/*发送器件地址(读)24C01*/
I2C_Send7bitAddress(I2C1, addr<1, I2C_Direction_Receiver);
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));
#endif

while (no)
{
if(no==1)
{
I2C_AcknowledgeConfig(I2C1, DISABLE);//最后一位后要关闭应答的
I2C_GenerateSTOP(I2C1, ENABLE);//发送停止位
}

while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED)); /* EV7 */
*pBuffer = I2C_ReceiveData(I2C1);
pBuffer++;
/* Decrement the read bytes counter */
no--;
}
//再次允许应答模式
I2C_AcknowledgeConfig(I2C1, ENABLE);
}

/****************************************************
**函数名:I2C_Standby_24C
**功能:24C是否准备好再写入的判断
**注意事项:本函数可以理解为:判忙
就是不停发地址 直到器件有应答
****************************************************/
void I2C_Standby_24C(void)
{
vu16 SR1_Tmp;
do
{
/*起始位*/
I2C_GenerateSTART(I2C1, ENABLE);
/*读SR1*/
SR1_Tmp = I2C_ReadRegister(I2C1, I2C_Register_SR1);
/*器件地址(写)*/
#ifdef AT24C01A
I2C_Send7bitAddress(I2C1, EEPROM_ADDR, I2C_Direction_Transmitter);
#else
I2C_Send7bitAddress(I2C1, 0, I2C_Direction_Transmitter);
#endif
}while(!(I2C_ReadRegister(I2C1, I2C_Register_SR1) & 0x0002));

/*清除应答错误标志*/
I2C_ClearFlag(I2C1, I2C_FLAG_AF);
/*停止位*/
I2C_GenerateSTOP(I2C1, ENABLE);
}

/*************************************************
**函数名:I2C_ByteWrite_24C
**功能:写一个字节
**注意事项:字写入同样需要调用忙判断
*************************************************/
void I2C_ByteWrite_24C(u8 addr,u8 dat)
{
/* 起始位 */
I2C_GenerateSTART(I2C1, ENABLE);
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));

#ifdef AT24C01A
/* 发送器件地址(写)*/
I2C_Send7bitAddress(I2C1, EEPROM_ADDR, I2C_Direction_Transmitter);
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));

/*发送地址*/
I2C_SendData(I2C1, addr);
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));