STM8S?模擬I2C程序
xu52rd?Post?at?2012-7-13?23:38:00

STM8S的硬件I2C還是存在問題不敢貿(mào)然使用.

于是決定用模擬I2C.

寫于?2011-03-27?11:

?

#define?SCL??????????????PE_ODR_ODR1
#define?SDA??????????????PE_ODR_ODR2
#define?SDAM?????????????PE_IDR_IDR2
#define?SET_SCL_OUT（）????{PE_DDR_DDR1=1;?PE_CR1_C11?=?1;?PE_CR2_C21?=?0;}
#define?SET_SDA_OUT（）????{PE_DDR_DDR2=1;?PE_CR1_C12?=?1;?PE_CR2_C22?=?0;}
#define?SET_SDA_IN（）?????{PE_DDR_DDR2=0;?PE_CR1_C12?=?0;?PE_CR2_C22?=?0;}
//--------------------------------------------------------------
//?Prototype??????:?void?I2C_Start（void）
//?Calls??????????:?Delay_5us（）
//?Description????:?Start?Singnal
//--------------------------------------------------------------
void?I2C_Init（void）
{
???I2C_CR1?&=?0xFE;??????//??PE=0?disable?I2C?module??
???SET_SCL_OUT（）;
???SET_SDA_OUT（）;???
}


//--------------------------------------------------------------
//?Prototype??????:?void?Delay_5us（void）
//?Description????:?大約延時5us
//--------------------------------------------------------------
void?Delay_5us（void）
{
???uchar?i;???????????????????//fcpu?8MHz?時
???for?（i=50;?i>0;?i--）;
}

?

//--------------------------------------------------------------
//?Prototype??????:?void?I2C_Start（void）
//?Calls??????????:?Delay_5us（）
//?Description????:?Start?Singnal
//--------------------------------------------------------------
void?I2C_Start（void）
{
????//?SDA?1->0?while?SCL?High
????SDA?=?1;????????????????????
????SCL?=?1;????????????????????
????Delay_5us（）;????????????????
????SDA?=?0;???????????????????
????Delay_5us（）;????????????????
????SCL?=?0;????????????????????
}


//--------------------------------------------------------------
//?Prototype??????:?void?I2C_Stop（void）
//?Calls??????????:?Delay_5us（）
//?Description????:?Stop?Singnal
//--------------------------------------------------------------?
void?I2C_Stop（void）
{
????//?SDA?0->1?while?SCL?High
????SDA?=?0;???????????????????
????SCL?=?1;???????????????????
????Delay_5us（）;????????????????
????SDA?=?1;???????????????????
????Delay_5us（）;???????????????
}

//--------------------------------------------------------------
//?Prototype??????:?void?I2C_SendACK（uchar?ack）;
//?Calls??????????:?Delay_5us（）
//?Parameters?????:?bit?ack:1-noack?0-ack
//?Description????:?Master?device?send?ACK?to?slave?device.
//--------------------------------------------------------------
void?I2C_SendACK（uchar?ack）
{
????if（ack?==?0）
????{
??????SDA?=?0;?
????}??
????else
????{
??????SDA?=?1;?
????}
????????????
????SCL?=?1;???????????????????
????Delay_5us（）;??
????
????SCL?=?0;????????????????????
????Delay_5us（）;?????
}

//--------------------------------------------------------------
//?Prototype??????:?uchar?I2C_SendByte（uchar?sendDAT）
//?Cal