wang_cnt0.c

美国tern公司开发的嵌入式开发平台586E

/*********************************************************************
	586_cnt0.c 	Test program for SC520 Timer0		 6-20-2001
	P13=Slave2 PIC IR0, interrupt vector=0x50, GP timer0

   Timer 0 will count pulses on TMRIN0 (pin J4.4) until reach ta+tb, interrupt us,
   and then roll over. LED will blink once per interrupt.

   To check current count value, call t0_rd().

	*********************************************************************/
#include <dos.h>
#include	"586.h"		 				/* 586E initialization */
#define MMCR 0xdf00
unsigned int t0,ta,tb,tm,ledd,t1;
unsigned int a,b,c,d,x,i;
unsigned char led1[]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,   //0,1,2,3,4,5
                       //0   1   2   3   4   5
                      0x7D,0x07,0x7F,0x6F,0x77,0x7C,    //6,7,8,9,A,B
                      //6   7   8   9   10  11
                      0x39,0x5E,0x79,0x71,0x73,0x3E,    //C,D,E,F,P,U
                      // 12  13  14  15  16  17
                      0x76,0x38,0x40,0x6E,0x0FF,0x00,   //H,L,-,Y, 全屏  ,'全暗'
                      //18  19  20  21  22   23
                      0x37,0x3F,0x6D,0x06,0x2F,0x6F,   //N,O,S,I,error,G,
                      //24  25  26  27  28  29
                      0x0E,0x67,0x50,0x31};             //J,Q,R,T
                      //30  31  32  33

void interrupt far t0_isr (void);

void main(void)
{
	sc_init();

   /* counting exteranl events on TMRIN0 (pin J4.4) */
   //初始化pio
   pio_init(0, 2); // PIO 0=LED as output
	for(i=2;i<27;i++){
		pio_init(i, 2); // PIO 2-26 as output
		}
	pio_init(28, 2); // PIO 28 as output
	pio_init(29, 2); // PIO 29 as output
	pio_init(30, 2); // PIO 30 as output
   //初始化cmpmaxa,cmpmaxb
	ta=(unsigned int)1000;  //0xffff
	tb=(unsigned int)1000;

  //	tm = 0xe005;	//	start count, interrupt enabled, external clock, continuous mode.
   					// See chapter 17 of AMD_DOCS\sc520\sc520_user_manual.pdf from
                  // root directory of CD-ROM (EV-P Kit/DV-P Kit) for info on
                  // TIMER0 control register

   tm = 0xe005;	// same as above, just without interrupt ;noncontinuous

	t0_init(tm,ta,tb,t0_isr);

	t0=0;
   ledd=0;

	while(1)
	{
		t1=t0_rd();		  // read current value of counter
      				     // use watch window to see ta increment as
                       // provide low signal on pin J4.4
   a=t1/1000;
   ta=t1%1000;
   b=t1/100;
   ta=t1%100;
   c=t1/10;
   d=t1%10;

    //display
	x=led1[a]|0xfe00;
   x=x<<2;
   poke(MMCR, _PIODATA15_0_,x);  //can not use outport command
   delay_ms(10);
	x=led1[b]|0xfd00;
   x=x<<2;
   poke(MMCR, _PIODATA15_0_,x);
   delay_ms(10);
   x=led1[c]|0xfb00;
   x=x<<2;
   poke(MMCR, _PIODATA15_0_,x);
   delay_ms(10);
   x=led1[d]|0xf700;
   x=x<<2;
   poke(MMCR, _PIODATA15_0_,x);
   delay_ms(10);

	}			// end of while(1)
}			// end of main

/*
//		Function:  t0_isr
//
//	Timer0 Interrupt handler.  Increment t0
//	P13=Slave2 PIC IR0, interrupt vector=0x50, GP timer0
*/
void interrupt far t0_isr (void)
{
t0++;
   pokeb(MMCR,_GPTMRSTA_,0x01|peekb(MMCR,_GPTMRSTA_)); // Clear T0 status
   // Issue the EOI to interrupt controller
	outportb(_S2PICOCW2_IO,0x60);	// Specific EOI for slave 2 IR0
  	outportb(_MPICOCW2_IO,0x65); // Specific EQI for master IR5
}