da.c

单片机应用开发实例.rar

#include <stdio.h>
#include <ADUC812.H>
void main (void)
{
//设置串口波特率
SCON  = 0x50;
TMOD |= 0x20;
TH1   = 0xFA;
TR1   = 1;
TI    = 1;
PCON |= 0x80;
//设置A/D转换12-bit 模式, 范围是0-VDD
//DAC0 DAC1 DACCON = 0111 1?01
DACCON = 0x7B;                       //每循环 4096次转换DAC0 和DAC1
while (1)
    {
    unsigned int i;
//满12 bit: 2^12 = 4096
    for (i = 0; i < 4096; i++)   
    {
    
DACCON &= ~0x04;                    //清SYNC位
    DAC0H = i >> 8; 
    DAC0L = i & 0xFF;
    DAC1H = (4095 - i) >> 8;
    DAC1L = (4095 - i) & 0xFF;
DACCON |=  0x04;                    //设置SYNC位

    printf ("Output %4.4X to DAC0 (%1.4fV) ", (unsigned) i, (float) i * 5.0 / 4095.0);
    printf ("Output %4.4X to DAC1 (%1.4fV)\n", (unsigned) 4095-i, (float) (4095-i) * 5.0 / 4095.0);
 }
  }
}