tic.c

8051试验程序 基础教材

//********************************************************************
//
// Author        : ADI - Apps            www.analog.com/MicroConverter
//
// Date          : 17 October 2003
//
// File          : TIC.c
//
// Hardware      : ADuC845, ADuC847, ADuC848
//
// Description   : Demonstrates a use of a timer interval counter for
//    counting longer intervals than the standard 8052
//    timers are capable of.
//
//    The LED will, on power up, flash at 6Hz. By pressing
//    the external interrupt button INT0 the counter will
//    count how long the button is pressed.
//    When released the program will flash the light at the
//    measured time correct only to the nearest unit
//    (1/128s, seconds, minutes or hours)rounded DOWN.
//    eg) If the button was pressed for 0.91000s the light
//    would complement every 0.90625s (less than 1 second
//    therefore it measures in 1/128s and the nearest unit
//    less than 0.91000s is 0.90625s). However if the light
//    was on for 1.6s it complements every 1s as the nearest
//    unit is now the second.
//    Pressing the INT0 button again will record a new
//    time interval which will flash the light in the same
//    way.
//********************************************************************

#include <stdio.h>
#include <ioADuC845.h> //Simply change this header  file to <ADuC847.h> or <ADuC848.h>
//if using an ADuC847 or ADuC848 part.

#define LED P3_bit.T0

#pragma vector=0x3
__interrupt void int_0 ()
{
   //LED ^= 1;
   TIMECON &= 0xFE;
   TIMECON |= 0x01;
   while(P3_bit.INT0 == 0);
   TIMECON &= 0xFD;

   if(SEC ==0 && MIN == 0 && HOUR ==0)
   {
      INTVAL  = SEC;
      TIMECON = 0x00;
      TIMECON = 0x03;
   }

   if(SEC !=0 && MIN == 0 && HOUR ==0)
   {
      INTVAL  = SEC;
      TIMECON = 0x00;
      TIMECON = 0x13;
   }

   if(MIN !=0 && HOUR ==0)
   {
      INTVAL  = MIN;
      TIMECON = 0x00;
      TIMECON = 0x23;
   }

   if(HOUR !=0)
   {
      INTVAL  = HOUR;
      TIMECON = 0x00;
      TIMECON = 0x33;
   }
}

#pragma vector=0x53
__interrupt void TIC_int ()
{
   LED ^= 1;
}

void main (void)
{
   int i;
//Configure Time Interval Counter
   TIMECON  = 0x03;
   INTVAL   = 0x0A;

//Configure External Interrupt
   TCON_bit.IT0    = 1;    // edge trig for int0
   IE_bit.EX0      = 1;      // enable external interrupt (int0)
   IEIP2           = 0x04;   // enable TIC interrupt
   IE_bit.EA       = 1;       // enable interrupts

   while(1)
   {
      LED^=0;
      for(i = 0; i < 10000; i++) {
      }
   }
}