STM32 的I2C 硬运用

/*

操作目标为一24C02
*/

#include “STM32Lib\\stm32f10x.h”
#include “hal.h”

//#define AT24C01A//24C01A,I2C时序和往后的24C02相同
#define AT24C01//24C01,I2C的时序和一般的有点不同

#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);
/*答应1字节1应对形式*/
I2C_AcknowledgeConfig(I2C1, ENABLE);

}

/***************************************************
**函数名:I2C_ReadS
**功用: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,从器材地址为EEPROM_ADDR
***************************************************/
void I2C_ReadS_24C(u8 addr ,u8* pBuffer,u16 no)
{
if(no==0)
return;

while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY));

/*答应1字节1应对形式*/
I2C_AcknowledgeConfig(I2C1, ENABLE);

/* 发送开端位 */
I2C_GenerateSTART(I2C1, ENABLE);
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));/*EV5,主形式*/

#ifdef AT24C01A
/*发送器材地址(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*/

/*开端位*/
I2C_GenerateSTART(I2C1, ENABLE);
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));

/*器材读*/
I2C_Send7bitAddress(I2C1, EEPROM_ADDR, I2C_Direction_Receiver);
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));

#else
/*发送器材地址(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);//最终一位后要封闭应对的
I2C_GenerateSTOP(I2C1, ENABLE);//发送中止位
}

while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED)); /* EV7 */
*pBuffer = I2C_ReceiveData(I2C1);
pBuffer++;
/* Decrement the read bytes counter */
no–;
}
//再次答应应对形式
I2C_AcknowledgeConfig(I2C1, ENABLE);
}

/****************************************************
**函数名:I2C_Standby_24C
**功用:24C是否预备好再写入的判别
**注意事项:本函数能够理解为:判忙
便是不停发地址 直到器材有应对
****************************************************/
void I2C_Standby_24C(void)
{
vu16 SR1_Tmp;
do
{
/*开端位*/
I2C_GenerateSTART(I2C1, ENABLE);
/*读SR1*/
SR1_Tmp = I2C_ReadRegister(I2C1, I2C_Register_SR1);
/*器材地址(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));

/*铲除应对过错标志*/
I2C_ClearFlag(I2C1, I2C_FLAG_AF);
/*中止位*/
I2C_GenerateSTOP(I2C1, ENABLE);
}

/*************************************************
**函数名:I2C_ByteWrite_24C
**功用:写一个字节
**注意事项:字写入相同需求调用忙判别
*************************************************/
void I2C_ByteWrite_24C(u8 addr,u8 dat)
{
/* 开端位 */
I2C_GenerateSTART(I2C1, ENABLE);
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));

#ifdef AT24C01A
/* 发送器材地址(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));

#else
I2C_Send7bitAddress(I2C1, addr<<1, I2C_Direction_Transmitter);
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
#endif

/* 写一个字节*/
I2C_SendData(I2C1, dat);
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

/* 中止位*/
I2C_GenerateSTOP(I2C1, ENABLE);

I2C_Standby_24C();
}

/*************************************************
**函数名:I2C_PageWrite_24C
**功用:写入一页(以内)
**注意事项:此函数供群写入调用
*************************************************/
void I2C_PageWrite_24C(u8 addr,u8* pBuffer, u8 no)
{
while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY));

/*开端位*/
I2C_GenerateSTART(I2C1, ENABLE);
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));

#ifdef AT24C01A
/*器材地址(写)*/
I2C_Send7bitAddress(I2C1, EEPROM_ADDR, I2C_Direction_Transmitter);
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));

/*写地址值*/
I2C_SendData(I2C1, addr);
while(! I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

#else
I2C_Send7bitAddress(I2C1, addr<<1, I2C_Direction_Transmitter);
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
#endif
while(no–)
{
I2C_SendData(I2C1, *pBuffer);
pBuffer++;
while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
}

/*中止位*/
I2C_GenerateSTOP(I2C1, ENABLE);
}

/*************************************************
**函数名:I2C_WriteS_24C
**功用:页写入24C
**注意事项:24C02最多答应一次写入8个字节
*************************************************/
void I2C_WriteS_24C(u8 addr,u8* pBuffer, u16 no)
{
u8 temp;

//1.先把页不对齐的部分写入
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.从页对齐开端写
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();
}
}
}

//测试用
void I2C_Test(void)
{
u8 i;
u8 I2c_Buf[128];

I2C_Standby_24C();

//填充缓冲
for(i=0;i<128;i++)
I2c_Buf[i]=i;

//写
I2C_WriteS_24C(1,I2c_Buf,120);

//清缓冲
for(i=0;i<128;i++)
I2c_Buf[i]=0;

//读
I2C_ReadS_24C(1,I2c_Buf,80);

for(i=1;i<120;i++)
{
if(I2c_Buf[i]!=i)
{
while(1);
}
}

}

就看这儿 确认是否正常~！

其实 都是 while 这种 硬等候 导致多次调不通 必须参加 超时判别。

简略的像

i=0;

while((!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED))&&i<12000);i++