HR7P193单片机IIC例程代码

以下是HR7P193单片机IIC例程代码：

#include "HR7P193.h"
#include "iic.h"

void IIC_Init()
{
    SDA = 1;        
    SCL = 1;
}

void IIC_Start()
{
    SDA = 1;
    SCL = 1;
    wait();
    SDA = 0;
    wait();
    SCL = 0;
}

void IIC_Stop()
{
    SDA = 0;
    SCL = 1;
    wait();
    SDA = 1;
    wait();
}

void IIC_WriteByte(unsigned char dat)
{
    unsigned char i;
    for(i=0;i<8;i++)
    {
        if(dat & 0x80)
            SDA = 1;
        else
            SDA = 0;
        dat <<= 1;
        wait();
        SCL = 1;
        wait();
        SCL = 0;
    }
    SDA = 1;
    wait();
    SCL = 1;
    wait();
    SCL = 0;
}

unsigned char IIC_ReadByte(unsigned char ack)
{
    unsigned char i, dat = 0;
    SDA = 1;
    for(i=0;i<8;i++)
    {
        wait();
        SCL = 1;
        dat <<= 1;
        if(SDA)
            dat |= 0x01;
        wait();
        SCL = 0;
    }
    if(ack)
        SDA = 0;
    else
        SDA = 1;
    wait();
    SCL = 1;
    wait();
    SCL = 0;
    SDA = 1;
    return dat;
}

注意，在使用这个例程代码之前，需要先定义 SDA 和 SCL 的引脚号码。