dacsine.c

8051试验程序 基础教材

//********************************************************************
//
// Author        : ADI - Apps            www.analog.com/MicroConverter
//
// Date          : 16 October 2003
//
// File          : DACsine.c
//
// Hardware      : ADuC845, ADuC847, ADuC848
//
// Description   : DAC outputs a sine wave of about 400Hz.
//                 Ensure S4 "RTD REFIN-" and "2.5V REFIN+" switches are ON.
//                 All other switches should be OFF.
//********************************************************************

#include <ioADuC845.h>            //To use on ADuC847 or ADuC848 simply change this
                  //include file to <ADuC847.h> or <ADuC848.h>

#define LED P3_bit.T0

unsigned char values[64][2]={{0x07, 0xFF},{0x08, 0xC8},{0x09, 0x8E},{0x0A, 0x51},{0x0B, 0x0F},
              {0x0B, 0xC4},{0x0C, 0x71},{0x0D, 0x12},{0x0D, 0xA7},{0x0E, 0x2E},
                 {0x0E, 0xA5},{0x0F, 0x0D},{0x0F, 0x63},{0x0F, 0xA6},{0x0F, 0xD7},
              {0x0F, 0xF5},{0x0F, 0xFF},{0x0F, 0xF5},{0x0F, 0xD7},{0x0F, 0xA6},
              {0x0F, 0x63},{0x0F, 0x0D},{0x0E, 0xA5},{0x0E, 0x2E},{0x0D, 0xA7},
              {0x0D, 0x12},{0x0C, 0x71},{0x0B, 0xC4},{0x0B, 0x0F},{0x0A, 0x51},
              {0x09, 0x8E},{0x08, 0xC8},{0x07, 0xFF},{0x07, 0x36},{0x06, 0x70},
              {0x05, 0xAD},{0x04, 0xEF},{0x04, 0x3A},{0x03, 0x8D},{0x02, 0xEC},
              {0x02, 0x57},{0x01, 0xD0},{0x01, 0x59},{0x00, 0xF1},{0x00, 0x9B},
              {0x00, 0x58},{0x00, 0x27},{0x00, 0x09},{0x00, 0x00},{0x00, 0x09},
              {0x00, 0x27},{0x00, 0x58},{0x00, 0x9B},{0x00, 0xF1},{0x01, 0x59},
              {0x01, 0xD0},{0x02, 0x57},{0x02, 0xEC},{0x03, 0x8D},{0x04, 0x3A},
              {0x04, 0xEF},{0x05, 0xAD},{0x06, 0x70},{0x07, 0x36}};

void main (void)
{
   PLLCON = 0x03;
   DACCON = 0x03;          //DAC to pin 14, 12bit, 2.5v range, normal, Power on

   DACH = 0x08;
   DACL = 0x00;

   while (1)
   {
      int i;
      for ( i = 0 ; i < 64; i++)
      {
         DACH = values[i][0];
         DACL = values[i][1];
      }
      LED ^= 1;
   }
}