ICL7135的C程序

ICL7135是一款数字电压表芯片，以下是一个简单的ICL7135的C语言程序示例：

#include <reg51.h>
#include <stdio.h>

sbit CS = P1^0;
sbit CLK = P1^1;
sbit DOUT = P1^2;
sbit DIN = P1^3;

void delay_us(unsigned int us)
{
    while(us--);
}

void delay_ms(unsigned int ms)
{
    while(ms--)
    {
        delay_us(1000);
    }
}

unsigned char read_adc(unsigned char channel)
{
    unsigned char i, value = 0;
    CS = 0;
    CLK = 0;
    DIN = 0;
    CLK = 1;
    CLK = 0;
    DIN = 1;
    CLK = 1;
    CLK = 0;
    DIN = 0;
    CLK = 1;
    CLK = 0;
    DIN = 0;
    CLK = 1;
    CLK = 0;
    DIN = 0;
    CLK = 1;
    CLK = 0;
    DIN = 1;
    CLK = 1;
    CLK = 0;
    DIN = 1;
    CLK = 1;
    CLK = 0;
    CS = 1;
    CLK = 1;
    CLK = 0;
    CS = 0;
    CLK = 0;
    DIN = 0;
    CLK = 1;
    CLK = 0;
    DIN = 1;
    CLK = 1;
    CLK = 0;
    DIN = 1;
    CLK = 1;
    CLK = 0;
    for(i=0;i<3;i++)
    {
        CLK = 1;
        value = (value << 1) | DOUT;
        CLK = 0;
    }
    for(i=0;i<channel;i++)
    {
        CLK = 1;
        CLK = 0;
    }
    for(i=0;i<11;i++)
    {
        CLK = 1;
        value = (value << 1) | DOUT;
        CLK = 0;
    }
    CS = 1;
    return value;
}

void main()
{
    unsigned char channel = 0, value = 0;
    float voltage = 0;
    while(1)
    {
        value = read_adc(channel);
        voltage = value * 5.0 / 255;
        printf("Channel %d: %.2fV\r\n", channel, voltage);
        delay_ms(500);
        channel++;
        if(channel > 4) channel = 0;
    }
}

这个程序可以在基于51单片机的开发板上测试ICL7135芯片，并且通过串口将测量结果输出到电脑上。需要注意的是，这个程序的具体实现可能会根据具体的硬件电路和开发板有所不同，需要根据实际情况进行调整。