timer.c

通用OSD控制(51单片机控制的TFTLCD源码,MTV018）

#pragma REGISTERBANK(0)

#include <reg52.h>
#include <intrins.h>
#include <stdlib.h>
#include "def.h"
#include "timer.h"
#include "at24c02.h"
#include "mtv130.h"

extern bit PIN_SIGIND;
extern void check_key(void);

volatile unsigned char jiffies = 0;
bit timerbh_pending = 0;
#if 1
static volatile unsigned char xjiffies = 0;
struct time_val xtime = { 0, 0, 0 };
#endif

#define INIT_T0	(65536L - (F_OSC/12)/HZ)

#define MAX_T0 10
static unsigned char t0_count = MAX_T0;

void timer_bh(void)
{

#if 1
	while (xjiffies != jiffies) {
		xjiffies++;
		xtime.msec10 += 100/HZ;
		t0_count--;
	}
	while (xtime.msec10 >= 100) {
		xtime.sec++;
		xtime.msec10 -= 100;
	}
	while (xtime.sec >= 60) {
		xtime.min++;
		xtime.sec -= 60;
	}
#endif
	check_key();
#if 0
	if (t0_count == 0) {
		TR1 = 0;
		if (TL1 < MAX_T0*2/4)
			PIN_SIGIND = 1;
		else {
			PIN_SIGIND = 0;

			if (TL1 > MAX_T0*11/4)//55/HZ)
				HZ_IND = 1;
			else
				HZ_IND = 0;
		}
		TMOD = 0x51;
		TH1 = TL1 = TF1 = 0;
		TR1 = 1;
		t0_count = MAX_T0;
	}
#endif
}

void timer_init(void)
{
	TH0 = (unsigned char)(INIT_T0>>8);
	TL0 = (unsigned char)INIT_T0;
	TR0 = 1;
	ET0 = 1;
	HZ_IND = 1;
	TH1 = TL1 = TF1 = 0;
	TR1 = 0;
}