原创 S3F9498读写24C02.OK

我测试OK.MCU:S3f9498 晶振: 8.4672MHz

#define I2C_SCL_H  Set_P16
#define I2C_SCL_L  Clr_P16
#define I2C_SDA_H  Set_P17
#define I2C_SDA_L  Clr_P17
#define I2C_SDA_IN  {P1CONH |= 0x00; P1CONH &= 0x3f;}//00:输入.不同其它IO设置
#define I2C_SDA_OUT  {P1CONH |= 0x80; P1CONH &= 0xbf;}//10:输出
#define I2C_SDA_Test Test_P17 

I2CIO_GLOBAL void I2C_Init();
I2CIO_GLOBAL void I2C_Delay(unsigned char t);
I2CIO_GLOBAL unsigned char I2C_InPut(unsigned char SlaveAddr,unsigned char SonAddr,unsigned char *dat,unsigned char count);
I2CIO_GLOBAL unsigned char I2C_OutPut(unsigned char SlaveAddr,unsigned char SonAddr,unsigned char *dat,unsigned char count);

#define IIC_CLOCK_DELAY 50

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

void I2C_Delay(unsigned char t)
{
 while (t--)
 {
  Clr_WatchDog;
  Clr_WatchDog;
 }
 
}
void I2C_Init()
{
//I2C_SCL_C = 0;//P4.6输出模式
//I2C_SDA_C = 0;//P4.7输出模式
I2C_SDA_OUT;
//I2C_SCL = 1;
I2C_SCL_H;
I2C_Delay(IIC_CLOCK_DELAY);
//I2C_SDA = 1;
I2C_SDA_H;
I2C_Delay(IIC_CLOCK_DELAY);
}
void I2C_Start(void)
{
//I2C_SDA = 1;
I2C_SDA_H;
I2C_Delay(IIC_CLOCK_DELAY);
//I2C_SCL = 1;
I2C_SCL_H;
I2C_Delay(IIC_CLOCK_DELAY);
//I2C_SDA = 0;
I2C_SDA_L;
I2C_Delay(IIC_CLOCK_DELAY);
//I2C_SCL = 0;
I2C_SCL_L;
I2C_Delay(IIC_CLOCK_DELAY);
}
void I2C_Stop(void)
{
//I2C_SCL = 1;
I2C_SCL_H;
I2C_Delay(IIC_CLOCK_DELAY);
//I2C_SDA = 0;
I2C_SDA_L;
I2C_Delay(IIC_CLOCK_DELAY);
//I2C_SDA = 1;
I2C_SDA_H;
I2C_Delay(IIC_CLOCK_DELAY);
}
char I2C_GetAck(void)
{
char ack;
//I2C_SDA_C = 1; //检测应答信号，把信号线p4.7改为输入模式
I2C_SDA_IN;
//I2C_SCL = 1;
I2C_SCL_H;
I2C_Delay(IIC_CLOCK_DELAY);
//ack=I2C_SDA;
if (I2C_SDA_Test)
{
 ack = 1;
}
else
{
 ack = 0;
}
//I2C_SCL = 0;
I2C_SCL_L;
I2C_Delay(IIC_CLOCK_DELAY);
//I2C_SDA_C = 0; //得到应答信号，把信号线该成输出模式
I2C_SDA_OUT;
//I2C_SDA = 0;
I2C_SDA_L;
return ack;
}

void I2C_PutAck(unsigned char ack0) //主机接收数据的应答，如果ACK0=0,应答，如果ACK0=1,不应答
{
//I2C_SDA = ack0&0x01;
if (ack0&0x01)
{
 I2C_SDA_H;
}
else
{
 I2C_SDA_L;
}
I2C_Delay(IIC_CLOCK_DELAY);
//I2C_SCL = 1;
I2C_SCL_H;
I2C_Delay(IIC_CLOCK_DELAY);
//I2C_SCL = 0;
I2C_SCL_L;
I2C_Delay(IIC_CLOCK_DELAY);
}
void I2C_Write(unsigned char dat) //发送8位数据，高位在前
{
unsigned char i;
for(i=8;i>0;i--)
{
//I2C_SDA=0;
I2C_SDA_L;
if(dat & 0x80)
{
//I2C_SDA=1;
I2C_SDA_H;
}
dat <<= 1;
//I2C_SCL = 1;
I2C_SCL_H;
I2C_Delay(IIC_CLOCK_DELAY);
//I2C_SCL = 0;
I2C_SCL_L;
I2C_Delay(IIC_CLOCK_DELAY);
}
}

unsigned char I2C_Read(void) //接收8位数据
{
unsigned char i,dat;
//I2C_SDA_C=1; //改变数据线P4.7的模式位输入模式，
I2C_SDA_IN;
for(i=8;i>0;i--)
{
//I2C_SCL = 1;
I2C_SCL_H;
I2C_Delay(IIC_CLOCK_DELAY);
dat <<= 1;
//if(I2C_SDA)
//{
//dat++;
//}
if (I2C_SDA_Test)
{
 dat++;
}
//I2C_SCL = 0;
I2C_SCL_L;
I2C_Delay(IIC_CLOCK_DELAY);
}
//I2C_SDA_C=0; //接收完毕，数据线P4.7改回输出模式
I2C_SDA_OUT;
//I2C_SDA=0;
I2C_SDA_L;
return dat;
}
/*输入从机地址，从机子地址，输入数据数组或指针，数据位数*/
unsigned char I2C_InPut(unsigned char SlaveAddr,unsigned char SonAddr,unsigned char *dat,unsigned char count)
{
SlaveAddr &= 0xfe; //从机地址最后位该为0，是写入模式
I2C_Start();   //发送开始信号
I2C_Write(SlaveAddr); //发送从机地址
if (I2C_GetAck())
{
 I2C_Stop();
 I2C_ASK = 1;
 return 1;
} //如果有应答，继续，否则返回1结束
I2C_Write(SonAddr);   //发送从机子地址，就是EEPROM的内存地址
if (I2C_GetAck()){ I2C_Stop();return 1; }
while(count--) //发送数据
{
I2C_Write(*dat++); //写入数据
if (I2C_GetAck()){ I2C_Stop();return 1; }
}
I2C_Stop();
return 0;
}
/*从EEPROMZ中读出数据*/
unsigned char I2C_OutPut(unsigned char SlaveAddr,unsigned char SonAddr,unsigned char *dat,unsigned char count)
{
SlaveAddr &= 0xfe;
I2C_Start();
I2C_Write(SlaveAddr);
if (I2C_GetAck()){ I2C_Stop();return 1; }
I2C_Write(SonAddr);
if (I2C_GetAck()){ I2C_Stop();return 1; } //前面为伪写
I2C_Start(); //重发开始信号
SlaveAddr |= 0x01; //该为读出模式
I2C_Write(SlaveAddr);
if (I2C_GetAck()){ I2C_Stop();return 1; }
while(count--)
{
*dat++=I2C_Read();
I2C_PutAck(0);
}
I2C_PutAck(1);
I2C_Stop();
return 0;
}

///////////////////////////////////////////////////////////////////////////////////////////////////

主程序调用

 DI;
 I2C_InPut(0xA0,0x01,I2C_DAT_Temp,2);
 DelayMs(10);
 I2C_OutPut(0xA0,0x01,I2C_DAT_Temp2,2);
 EI;