main.c

来自「这是单片机C51典型应用设计代码」· C语言 代码 · 共 42 行

#include <stdio.h>
#include <ADUC816.H>

void main (void)
{
/*-------------------------------------
Setup the serial port
-------------------------------------*/
SCON  = 0x50;
TMOD |= 0x20;
TH1   = 0xFA;
TR1   = 1;
TI    = 1;
PCON |= 0x80;

/*-------------------------------------
Configure the D/A converter:
  12-bit mode, 0-VDD range,
  DACCON = xxx1 0111
-------------------------------------*/
DACCON = 0x17;
                
/*-------------------------------------
Loop thru all 4096 counts and update
the DAC.
-------------------------------------*/
while (1)
  {
  unsigned int i;

// Full 12 bit scale: 2^12 = 4096
  for (i = 0; i < 4096; i++)
    {
    DACH = i >> 8;
    DACL = i & 0xFF;

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