main.c

CVAVR完整程序

/*****************************************************
File name           : main.c  迎奥运会倒计时钟系统软件
Chip type           : ATmega16
Program type        : Application
Clock frequency     : 8.000000 MHz
Memory model        : Small
External SRAM size  : 0
Data Stack size     : 256
*****************************************************/
#include <mega16.h> 
/* the DS1302 is connected to PORTD */
/* the SCLK signal is bit 4 */
/* the IO signal is bit 5 */
/* the RST signal is bit 6 */
#asm
    .equ __ds1302_port=0x12
    .equ __ds1302_sclk=4
    .equ __ds1302_io=5    
    .equ __ds1302_rst=6
#endasm
#include <ds1302.h>

flash unsigned char led_7[14]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F,0x01,0x02,0x00}; 	// 7 段码表
// 系统工作状态定义
#define clock_nomal	0       // 正常显示状态       
#define clock_set_1	1       // 时间设置状态
#define clock_set_2	2       // 当前日期设置状态
#define clock_set_3	3       // 终止日期设置状态

eeprom unsigned char e_date_flag;    // EEPROM数据有效标记
eeprom unsigned char e_date_set[3];  // 存放终点日期，如奥运会开幕日期

unsigned char	date[3];			        // 年、月、日计数和设置单元
unsigned char	time[3],time_set[3];		// 时、分、秒计数和设置单元
signed int	tian,tian_1,tian_2;		// 天数单元
unsigned char	dis_buff[10];				// 显示缓冲区，存放要显示的10个字符的段码值
unsigned char	time_1s_counter,key_stime_counter,time_20s_counter; 
unsigned char	clock_state, set_state,return_time;
bit	time_add,point_on,set_on,time_1s_ok,key_stime_ok,time_dis_on;

void display(void)					// 10位LED数管动态扫描函数
{
    static unsigned char posit;
	PORTA = 0xff;PORTC = 0xff;          // 关显示消影
	PORTB = led_7[dis_buff[posit]];     // 输出段码
	if (set_on && clock_state != clock_nomal && posit==set_state)
	    PORTB= 0x00;	// 日期时间设置闪烁
	switch(posit)
	{
		case 0:PORTA.0 = 0;break;       // 动态扫描显示
		case 1:PORTA.1 = 0;break;
		case 2:PORTA.2 = 0;break;
		case 3:PORTA.3 = 0;break;
		case 4:PORTA.4 = 0;break;
		case 5:PORTA.5 = 0;break;
		case 6:PORTA.6 = 0;break;
		case 7:PORTA.7 = 0;break;
		case 8:PORTC.7 = 0;break;
		case 9:PORTC.6 = 0;break;       // 秒闪烁位
	}
	if (++posit >= 10 ) posit = 0;
}

// Timer 0 比较匹配中断服务，1ms定时
interrupt [TIM0_COMP] void timer0_comp_isr(void)
{
	time_add = !time_add;
	if (time_add)
		display();
	else
	{
		if (++key_stime_counter >= 5)
		{
			key_stime_counter = 0;								// 10ms到
			key_stime_ok = 1;

			if (!(++time_1s_counter %25))set_on = !set_on;		// 设置日期时间设置闪烁标志
			if (!(time_1s_counter %50))point_on = !point_on;	// 设置秒闪烁标志			

			if (time_1s_counter >= 100)
			{
				time_1s_counter = 0;
				time_1s_ok = 1; 		       					// 1s到
				if (++time_20s_counter<=5)
					time_dis_on = 0;
				else
					time_dis_on = 1;
				if (time_20s_counter >= 20) time_20s_counter = 0;
			}
		}
	}	
}

void time_to_disbuffer(unsigned char *time)				// 日期、时钟、天数送显示缓冲区函数
{
	unsigned char i,j=0;
	for (i=0;i<=2;i++)
	{
		dis_buff[j++] = time[i] / 10;
		dis_buff[j++] = time[i] % 10;
	}
}


#define key_input	PINC			// 按键输入口
#define key_mask	0b00001111		// 按键输入屏蔽码
#define key_no		0
#define key_set_1	1               // 日期、时间设置
#define key_up		2               // 加一键
#define key_enter	3               // 确认键
#define key_set_2	4               // 终点日期设置
#define key_state_0	0
#define key_state_1	1
#define key_state_2	2
#define key_state_3	3

unsigned char read_key(void)
{
	static unsigned char key_state = 0,key_press;
	unsigned char key_return = key_no;

	key_press = key_input & key_mask;		// 读按键I/O电平
	switch (key_state)
	{
		case key_state_0:				    // 按键初始态
			if (key_press != key_mask) key_state = key_state_1;	
			break;					        // 键被按下，状态转换到键确认态
		case key_state_1:				    // 按键确认态
			if (key_press == (key_input & key_mask))
			{
				if (key_press == 0b00001110) key_return = key_set_1;
				else if (key_press == 0b00001101) key_return = key_up;
				else if (key_press == 0b00001011) key_return = key_enter;
				else if (key_press == 0b00000111) key_return = key_set_2;
				
				key_state = key_state_2;	// 状态转换到键释放态
			}
			else
				key_state = key_state_0;	// 按键已抬起，转换到按键初始态
			break;
		case key_state_2:
			if (key_press == key_mask) key_state = key_state_3;
			break;	                        //按键已释放，转再次确认释放
		case key_state_3:
			if (key_press == key_mask) key_state = key_state_0;
			break;	                        //按键已释放，转换到按键初始态
	}
   	return key_return;
}

void main(void)
{
    unsigned char key_temp,i;
    unsigned char date_set[3];
    int y_temp;

    PORTA=0x00;
    DDRA=0xFF;

    PORTB=0x00;
    DDRB=0x7F;

    PORTC=0x0F;
    DDRC=0xC0;

    PORTD=0x80;
    DDRD=0x80;

    //TIMER0 initialize - prescale:64 8M 
    // WGM: CTC
    // desired value: 1mSec
    // actual value:  1.004mSec (-0.4%)
    TCCR0 = 0x00; //stop
    OCR0  = 0x7D;  //set compare
    TCCR0 = 0x0B; //start timer


    // Timer(s)/Counter(s) Interrupt(s) initialization
    TIMSK=0x02;

    // Analog Comparator initialization
    // Analog Comparator: Off
    // Analog Comparator Input Capture by Timer/Counter 1: Off
    ACSR=0x80;
    SFIOR=0x00;

    if (e_date_flag != 0xa5)        // 第一次运行设置终点日期到EEPROM            
    {
	    e_date_set[0] = 8;          // 北京奥运会开幕时间
        e_date_set[1] = 8;          // 08年8月8日
	    e_date_set[2] = 8;
	    e_date_flag = 0xa5;
    }
    date_set [0] = e_date_set[0];   // 读出终点日期值   
    date_set [1] = e_date_set[1];
    date_set [2] = e_date_set[2];

    /* initialize the DS1302 RTC:
       use trickle charge,
       with 1 diode and 8K resistor */
    rtc_init(1,2,3);                // 初始化DS1302

    date[0] = 7; date[1] = 8; date[2] = 1;	    // 设日期初值07-08-1
    time[0] = 23; time[1] = 58; time[2] = 55;	// 设时间初值23:58:55 

    // Global enable interrupts
    #asm("sei")

    while (1)
    {
	    if (key_stime_ok)				// 10ms到，键处理或日期处理
	    {
		    key_stime_ok = 0;
		    if (time_1s_ok)				// 1秒到
		    {
			    time_1s_ok = 0;
			    rtc_get_date(&date[2],&date[1],&date[0]);   // 读出DS1302中的当前日期
			    // 以下计算当前日期到终点日期还有多少天数，注意考虑闰年的因素
			    tian = 0;tian_1 = 0;tian_2 = 0;

			    if (date[0] < date_set[0] || ((date[0] == date_set[0]) && (date[1] < date_set[1])) ||((date[0] == date_set[0]) && (date[1] == date_set[1]) && (date[2] <date_set[2])))
			    {
				    for (i=date[0]; i<date_set[0];i++)
				    {
					    y_temp = 2000+(int)i;
					    if ((y_temp % 400 == 0)  || ((y_temp % 4 == 0) && (y_temp % 100 != 0)))
						    tian += 366;                    // 闰年为366天
					    else
						    tian += 365;                    // 通常一年为365天
				    }

				    for (i=1;i<date[1];i++)
				    {
					    if ( i == 1 || i == 3 || i == 5 || i == 7 || i == 8 || i == 10 || i == 12 )
					    {
					        tian_1 += 31;                   // 大月为31天 
					    }	
					    else if (i == 2)
					    {
						    y_temp = 2000 + (int) date[0];
						    if ((y_temp % 400 == 0)  || ((y_temp % 4 == 0) && (y_temp % 100 != 0)))
							    tian_1 += 29;               // 闰年2月为29天
						    else
							    tian_1 += 28;               // 通常2月为28天
					    }
					    else
					    {
						    tian_1 += 30;                   // 小月为30天
					    }	
				    }

				    for (i=1;i<date_set[1];i++)
				    {
					    if ( i == 1 || i == 3 || i == 5 || i == 7 || i == 8 || i == 10 || i == 12 )
					        tian_2 += 31;
					    else if (i == 2)
					    {
						    y_temp = 2000 + (int) date_set[0];
						    if ((y_temp % 400 == 0)  || ((y_temp % 4 == 0) && (y_temp % 100 != 0)))
							    tian_2 += 29;
						    else
							    tian_2 += 28;
					    }	
					    else
					       tian_2 += 30;
					}
				    tian = tian + tian_2 - tian_1 + (int)date_set[2] - (int)date[2];
    			}
			    else
			    {
				    for (i=date_set[0]; i<date[0];i++)
				    {
					    y_temp = 2000+(int)i;
					    if ((y_temp % 400 == 0)  || ((y_temp % 4 == 0) && (y_temp % 100 != 0)))
						    tian += 366;
					    else
						    tian += 365;
				    }

				    for (i=1;i<date[1];i++)
				    {
					    if ( i == 1 || i == 3 || i == 5 || i == 7 || i == 8 || i == 10 || i == 12 )
					       tian_1 += 31;
						else if (i == 2)
					    {
						    y_temp = 2000 + (int) date[0];
						    if ((y_temp % 400 == 0)  || ((y_temp % 4 == 0) && (y_temp % 100 != 0)))
							    tian_1 += 29;
						    else
							    tian_1 += 28;
					    }
					    else
					    	tian_1 += 30;
				    }