oki mcu i2c通信问题

本帖最后由 eehome 于 2013-1-5 09:58 编辑

请看下面代码为oki mcu（ML610Q411） 读写外部EEPROM（24C02），但是通信不成功。用示波器测的SDA引脚发送完器件地址的高四位便停止了。请高手帮忙解决。

void I2C_Init(void)

{

I2C0CON = 0x00;  //stop communication,acknowledgment data "0"

I2C0MOD = 0x13;  //Enable I2C,standard mode

}

unsigned char WaitAck(void)

{

return (!I20ACR);

}

void Write24C02(unsigned char add,unsigned dat) {

I2C0CON = 0x01;

I2C0SA = 0xA0;

WaitAck();

I2C0CON = 0x01;

I2C0TD = add;

WaitAck();

I2C0CON = 0x01;

I2C0TD = dat;

WaitAck();

I2C0CON = 0x02;

}

unsigned char Read24C02(unsigned char add) {

unsigned char data;

I2C0CON = 0x01;

I2C0SA = 0xA0;

WaitAck();

I2C0CON = 0x01;

I2C0TD = add;

WaitAck();

I2C0CON = 0x05;

I2C0SA = 0xA1;

WaitAck();

data = I2C0RD;

I2C0CON = 0x81;

I2C0CON = 0x02;

return data;

}