9-1.c

一些简单的c51程序

#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);
    }
}