callback.c

用凌阳单片机(sunplus)实现的红外接收装置

#include "callback.h"



void	key_dec_press_callback()
{
	custom_temper++;
	check_and_update_digit();
	update_taget_impulse();
	beep();
}

void	key_inc_press_callback()
{
	custom_temper--;
	check_and_update_digit();
	update_taget_impulse();
	beep();
}


void	red_interrupt_callback()
{
	red_int_cnt++;
}


static int state = 0; // 0 wait for a red int, 1 adding, 2 waiting for caculating, 3 controling, 4 tail delaying
static int lost_cnt = 0;
static int tail_delay_cnt = 0;
static int pwm_state = 0;
//volatile int caculation_ok = 0;
//volatile int frame_receive_ok = 0;
//volatile int control_impulse_to_send = 0;
//volatile int impulse_reveived = 0;
static int led_cnt = 0;
static volatile int sound_cnt = 0;
static volatile int sound_type = 0; // 0 alarm, 1 beep;
static int sound = 0;

void timer_4kHz_callback()
{
	if (state == 0) {	// waiting for a red int;
		if (red_int_cnt != 0) {
			impulse_reveived = red_int_cnt;
			state = 1;
			lost_cnt = 0;
			red_int_cnt = 0;
			synch_lost = 0;
		} else {
			lost_cnt++;
			if ( lost_cnt >4000 ) {
				synch_lost = 1;
			}
		}
	} else if (state == 1)  {  // adding;
		if (red_int_cnt == 0) {
			lost_cnt++;
			if (lost_cnt > 12)  {// 3ms
				state = 2;
				frame_receive_ok = 1;
			}	
		} else {
			impulse_reveived += red_int_cnt;
			red_int_cnt = 0;
			lost_cnt = 0;
		}
	} else if (state == 2) { // waiting for caculation
		if (caculation_ok == 1) {
			caculation_ok = 0;
			state = 3;
			pwm_state = 0;
		}
	} else if (state == 3) {
		if (pwm_state == 0) {
			if (control_impulse_to_send > 0) {
				control_impulse_to_send--;
				set_PWM();
			} else {
				state = 4;
				tail_delay_cnt = 0;
			}
		} else if (pwm_state == 2) {
			del_PWM();
		}
		if (++pwm_state >= 4) {
			pwm_state = 0;
		}
	} else if ( state == 4 ) {
		if (++tail_delay_cnt > 7 ) {
			state = 0;
			red_int_cnt = 0;
			lost_cnt = 0;
		}
	} else {
		/* unkown condition */
		while(1);
	}

	/* deal with led showwing */
	if ((++led_cnt & 0x0007) == 0) {
		int shift = led_cnt / 8;
		int dot;
		int num;
		if (shift == 1 || shift == 3) {
			dot = 1;
		} else if (shift == 4 ) {
			dot = 0;
			shift = 0;
			led_cnt = 0;
		} else {
			dot = 0;
		}
		if (synch_lost == 1 && (shift <= 1)) {
			num = 11;
		} else {
			num = digit[shift];
		}	
		show_digit(shift, num,  dot);
	}

	/* deal with alarm sound */
	if(sound_cnt==0){
		if(alarm_enable)	{
			sound_cnt=1;	
			sound_type = 0;
		}
	}
	else{
		if(sound_cnt>1000){
			sound_cnt++;
  		   	if(sound_cnt==2000)	{
				if(alarm_enable) {
					sound_type = 0;
					sound_cnt=1; 
				} else {
					sound_cnt=0;
				}	
  		    }
		}
		else{
			sound_cnt++;
			if (sound_type == 1) {
				sound=sound^0x0fff;
			} else {
				if ((sound_cnt & 0x0001) == 0) {
					sound=sound^0x0fff;
				}
			}
			set_dac(sound);
		}
	}

	/* alarm status */
	if (synch_lost == 1 || temper_lost == 1) {
		alarm_enable = 1;
	} else {
		alarm_enable = 0;
	}
	
}


void beep()
{
	sound_cnt = 1;
	sound_type = 1;
}