Timer/main.c at master · MallocPointer/Timer · GitHub

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#include <reg52.h>
#define uchar unsigned char
#define uint unsigned int

sbit lcden = P3 ^ 4;
sbit rs = P3 ^ 5;
sbit rw = P3 ^ 6;
sbit dula = P2 ^ 6;
sbit wela = P2 ^ 7;

sbit key_mode = P3 ^ 0;  // 切换调节位置
sbit key_inc = P3 ^ 1;  // 加
sbit key_dec = P3 ^ 2;  // 减
sbit key_ok = P3 ^ 3;  // 确定 / 启动倒计时

sbit beep = P2 ^ 3;      // 蜂鸣器

						 // 设定时间 & 当前时间
uchar set_h = 0, set_m = 0, set_s = 0;
uchar now_h = 0, now_m = 0, now_s = 0;

uchar count = 0, pos = 0;  // pos: 0-H, 1-M, 2-S, 3-退出
bit running = 0;           // 是否正在倒计时

void delay(uint z) {
	uint x, y;
	for (x = z; x > 0; x--)
		for (y = 110; y > 0; y--);
}

void write_cmd(uchar cmd) {
	rs = 0;
	rw = 0;
	lcden = 0;
	P0 = cmd;
	delay(1);
	lcden = 1;
	delay(1);
	lcden = 0;
}

void write_data(uchar dat) {
	rs = 1;
	rw = 0;
	lcden = 0;
	P0 = dat;
	delay(1);
	lcden = 1;
	delay(1);
	lcden = 0;
}

void LCD_init() {
	write_cmd(0x38);
	write_cmd(0x0C);
	write_cmd(0x06);
	write_cmd(0x01);
}

void write_str(uchar addr, uchar* str) {
	write_cmd(addr);
	while (*str) {
		write_data(*str++);
	}
}

void display_time(uchar row, uchar h, uchar m, uchar s) {
	uchar addr = (row == 0) ? 0x80 + 7 : 0x80 + 0x40 + 7;
	write_cmd(addr);
	write_data(h / 10 + '0');
	write_data(h % 10 + '0');
	write_data(':');
	write_data(m / 10 + '0');
	write_data(m % 10 + '0');
	write_data(':');
	write_data(s / 10 + '0');
	write_data(s % 10 + '0');
}

void update_display() {
	write_str(0x80, "Timer: ");
	display_time(0, set_h, set_m, set_s);
	write_str(0x80 + 0x40, "Now:   ");
	display_time(1, now_h, now_m, now_s);
}

void timer0_init() {
	TMOD = 0x01;
	TH0 = (65536 - 50000) / 256;
	TL0 = (65536 - 50000) % 256;
	EA = 1;
	ET0 = 1;
	TR0 = 1;
}

void timer0() interrupt 1 {
	TH0 = (65536 - 50000) / 256;
	TL0 = (65536 - 50000) % 256;
	if (!running) return;

	count++;
	if (count >= 20) {  // 1秒
		count = 0;
		if (now_h == 0 && now_m == 0 && now_s == 0) {
			running = 0;
			beep = 0; // 蜂鸣器响
		}
		else {
			if (now_s > 0)
				now_s--;
			else {
				now_s = 59;
				if (now_m > 0)
					now_m--;
				else {
					now_m = 59;
					if (now_h > 0)
						now_h--;
				}
			}
		}
		update_display();
	}
}

void key_scan() {
	if (key_mode == 0) {
		delay(10);
		if (key_mode == 0) {
			pos = (pos + 1) % 4;
			while (key_mode == 0);
		}
	}
	if (key_inc == 0) {
		delay(10);
		if (key_inc == 0) {
			while (key_inc == 0);
			if (!running) {
				if (pos == 0 && set_h < 23) set_h++;
				if (pos == 1 && set_m < 59) set_m++;
				if (pos == 2 && set_s < 59) set_s++;
				update_display();
			}
		}
	}
	if (key_dec == 0) {
		delay(10);
		if (key_dec == 0) {
			while (key_dec == 0);
			if (!running) {
				if (pos == 0 && set_h > 0) set_h--;
				if (pos == 1 && set_m > 0) set_m--;
				if (pos == 2 && set_s > 0) set_s--;
				update_display();
			}
		}
	}
	if (key_ok == 0) {
		delay(10);
		if (key_ok == 0) {
			while (key_ok == 0);
			if (!running) {
				now_h = set_h;
				now_m = set_m;
				now_s = set_s;
				beep = 1;  // 关闭蜂鸣器
				running = 1;
			}
		}
	}
}

void main() {
	beep = 1; // 默认关闭蜂鸣器
	LCD_init();
	update_display();
	timer0_init();
	while (1) {
		key_scan();
	}
}