ad.c

单片机应用开发实例.rar

例如，A/D（芯片为ADuC812）仿真程序源代码如下：
    
#include <ADUC812.H>
#include <stdio.h>
void main (void)
{
unsigned char chan_2_convert;

SCON  = 0x50;                            //设置串口波特率为300 Baud

TMOD |= 0x20;
TH1   = 0xA0;
TR1   = 1;
TI    = 1;

ADCCON1 = 0x7C;                           //设置每通道的A/D转换为连
//续的0111 1100 
while (1)
        {
        unsigned int conv_val;
        unsigned char channel;
//开始转换，并且一直到完成
        chan_2_convert = (chan_2_convert + 1) % 8;
        ADCCON2 = (ADCCON2 & 0xF0) | chan_2_convert;
        SCONV = 1;
        while (ADCCON3 & 0x80);
//读A/D值并且打印
        channel  = ADCDATAH >> 4;
        conv_val = ADCDATAL | ((ADCDATAH & 0x0F) << 8);
        
printf ("ADC Channel %bu = 0x%4.4X\r\n", channel, conv_val);
      }
}