STM8L152模拟IIC程序(2)

{

//return GPIO_ReadInputPin(IIC_GPIOx, IIC_SDA_GPIO_Pin); return GPIO_ReadInputDataBit(IIC_GPIOx, IIC_SDA_GPIO_Pin); }

//产生起始信号 void IIC_Start(void) {

GPIO_Init(GPIOC,GPIO_Pin_0,GPIO_Mode_Out_PP_High_Slow);//set SDA pin as output high Delay();

GPIO_Init(GPIOC,GPIO_Pin_1,GPIO_Mode_Out_PP_High_Slow);//set SCL pin as output high Delay();

GPIO_Init(GPIOC,GPIO_Pin_0,GPIO_Mode_Out_PP_Low_Slow);//set SDA pin as output low Delay();

GPIO_Init(GPIOC,GPIO_Pin_1,GPIO_Mode_Out_PP_Low_Slow);//set SCL pin as output low Delay(); }

//产生停止信号 void IIC_Stop(void) {

GPIO_Init(GPIOC,GPIO_Pin_0,GPIO_Mode_Out_PP_Low_Slow);//set SDA pin as output low

Delay();

GPIO_Init(GPIOC,GPIO_Pin_1,GPIO_Mode_Out_PP_High_Slow);//set SCL pin as output high Delay();

GPIO_Init(GPIOC,GPIO_Pin_0,GPIO_Mode_Out_PP_High_Slow);//set SDA pin as output high Delay(); }

//等待响应信号

//0--接收应答成功 1-接收应答失败 unsigned char IIC_Wait_Ack(void) {

unsigned char ucErrTime = 0;

GPIO_Init(GPIOC,GPIO_Pin_1,GPIO_Mode_Out_PP_High_Slow);//set SCL pin as output high Delay();

GPIO_Init(GPIOC,GPIO_Pin_0,GPIO_Mode_In_PU_No_IT); //set sda as input with pull up

while(SDA_READ()) {

ucErrTime++; if(ucErrTime > 250) {

IIC_Stop(); return 1; }

}

GPIO_Init(GPIOC,GPIO_Pin_1,GPIO_Mode_Out_PP_Low_Slow); //set SCL pin as output low Delay(); return 0; }

//产生ACK信号 void IIC_Ack(void) {

GPIO_Init(GPIOC,GPIO_Pin_1,GPIO_Mode_Out_PP_High_Slow);//set SCL pin as output low Delay(); //延时

GPIO_Init(GPIOC,GPIO_Pin_0,GPIO_Mode_Out_PP_High_Slow);//set SDA pin as output high Delay();

GPIO_Init(GPIOC,GPIO_Pin_0,GPIO_Mode_Out_PP_Low_Slow);//set SDA pin as output low Delay();

GPIO_Init(GPIOC,GPIO_Pin_1,GPIO_Mode_Out_PP_High_Slow); //set SCL pin as output low Delay();

GPIO_Init(GPIOC,GPIO_Pin_1,GPIO_Mode_Out_PP_Low_Slow); //set SCL pin as output low Delay();

GPIO_Init(GPIOC,GPIO_Pin_0,GPIO_Mode_Out_PP_High_Slow);//set

SDA pin as output high Delay(); }

//No ACK

void IIC_NAck(void) {

GPIO_Init(GPIOC,GPIO_Pin_1,GPIO_Mode_Out_PP_Low_Slow); //set SCL pin as output low Delay();

GPIO_Init(GPIOC,GPIO_Pin_0,GPIO_Mode_Out_PP_High_Slow);//set SDA pin as output high Delay();

GPIO_Init(GPIOC,GPIO_Pin_1,GPIO_Mode_Out_PP_High_Slow);//set SCL pin as output high Delay(); //延时

GPIO_Init(GPIOC,GPIO_Pin_1,GPIO_Mode_Out_PP_Low_Slow);//set SCL pin as output low Delay(); //延时 }

//IIC发送一个字节

void IIC_Send_Byte(unsigned char txd) {

unsigned char i;

GPIO_Init(GPIOC,GPIO_Pin_1,GPIO_Mode_Out_PP_Low_Slow); //set SCL pin as output low Delay();

for(i = 0; i < 8; i++) {

if(txd & 0x80) {

GPIO_Init(GPIOC,GPIO_Pin_0,GPIO_Mode_Out_PP_High_Slow);//set SDA pin as outputhigh } else {

GPIO_Init(GPIOC,GPIO_Pin_0,GPIO_Mode_Out_PP_Low_Slow);//set SDA pin as output low } txd <<= 1;

GPIO_Init(GPIOC,GPIO_Pin_1,GPIO_Mode_Out_PP_High_Slow);//set SCL pin as output high Delay();

GPIO_Init(GPIOC,GPIO_Pin_1,GPIO_Mode_Out_PP_Low_Slow); //set SCL pin as output low Delay(); } }

//读取一个字节

unsigned char IIC_Read_Byte(unsigned char ack) {

unsigned char i, res = 0;

GPIO_Init(GPIOC,GPIO_Pin_0,GPIO_Mode_In_PU_No_IT); //set sda as