timer.c

HDMI anx9021的驱动

//********************************************************************************************
//********************************************************************************************
//***************************     Firmware for ANX9021     ***********************************
//********************************************************************************************
//********************************************************************************************

//******************************************************************************
//  ANALOGIX Company 
//  ANX9021 Firmware on AT89C51RC clean for customer
//  Version 1.51	2006/04/27
//******************************************************************************

#include "timer.h"
#include "mcu.h"

unsigned char th0_def;
unsigned int timer_tick;
xdata char timer_done;
xdata unsigned char hh, mm, ss;

void init_timer(unsigned char intval)
{
	stop_timer();
	th0_def = intval;
	TH0 = intval;
	TL0 = 0x00;
	TMOD = TMOD & 0xf0 | 0x01;
	ET0 = 1;
	timer_done = 0;
	
	timer_tick = 0;
	hh = 0;
	mm = 0;
	ss = 0;
}

void timer_isr(void)
{
    timer_tick++;
	stop_timer();
	TH0 = th0_def;
	TL0 = 0x00;
	start_timer();
	if (!timer_done) {
		timer_done = 1;
	}
    if (timer_tick % 125 == 0) {
        if (timer_tick >= (125*524))
            timer_tick = 0;
        ss++;
        if (ss > 59) {
            ss = 0;
            mm++;
            if(mm > 59) {
                mm = 0;
                hh++;
            }
        }
    }
}

void delay_ms(int n)
{
	int i, j;
	
	for (i=0; i<n; i++) {
		for (j=0; j<DELAY_FACTOR; j++)
			;
	}
}
/*
// used for bad cts case  
unsigned long get_timer_tick(void)
{
    xdata unsigned char c, c0, c1;
    xdata unsigned long n;
    
    EA = 0;
    stop_timer();
    c0 = TL0;
    c = TH0;
    start_timer();
    if (TF0)
        c1 = timer_tick+1;
    else
        c1 = timer_tick;
    EA = 1;
//    c1 = timer_tick;
    n = c1;
    n = (n * (256 - TINTVAL_8MS));
    n = n + c - TINTVAL_8MS;
    n = n << 8;
    n = n + c0;
    n = n >> 4;
    return n;
}

void show_cur_time(void)
{
    debug_printf("%.2bu:%.2bu:%.2bu", hh, mm, ss);
}
*/