凌阳61单片机使用7段数码管显示数字时钟的程序

#include

//中断函数定义

void IRQ1(void) __attribute__((ISR));

void IRQ5(void) __attribute__((ISR));

void IRQ6(void) __attribute__((ISR));

enum { RUN, CHGSECOND, CHGMINUTE, CHGHOUR } clock_status;   //时钟的状态

unsigned int hour,minute,second;

unsigned int show_hour, show_minute, show_second;

enum { NOKEY, PRESSING, PRESSED } key_status;           //键盘按下与否的状态

unsigned key_code;

// 7段LED数码管的字形码，采用高八位输出，决定显示的字形，如: '0'、'1'等

const unsigned int zhixingma[] = {  0x3f00, 0x0600, 0x5b00, 0x4f00,

                                    0x6600, 0x6d00, 0x7c00, 0x0700,

                                    0x7f00,0x6f00 };

// 数码管选择的"位段码",决定哪一位数码管显示

const unsigned int weiduanma[] = {0x0002, 0x0004, 0x0008, 0x0010, 0x0020, 0x0040};

//数码管的两个DD引脚, 为时,中间的冒号亮

const unsigned int wei_DD = 0x0081;

void display(unsigned int wei, unsigned int number)

{

    *P_IOA_Data = zhixingma[number];

    //设置位段码时，不能改变冒号的状态  

    *P_IOB_Data = weiduanma[wei] | (*P_IOB_Buffer & wei_DD);

}

//取反数码管中间的冒号

void opposite_dots()

{  

*P_IOB_Data = wei_DD ^ (*P_IOB_Buffer);

}

void delay(unsigned int howlong)

{

    while(howlong--){

        unsigned int temp = 0x00ff;

        *P_Watchdog_Clear = 1;

        while(temp--);

    }

}

void init()

{  

INT_OFF();

    *P_IOA_Dir = 0xff00;

    *P_IOA_Attrib = 0xff00;

    *P_IOB_Dir = 0x00ff;

    *P_IOB_Attrib = 0x00ff;

    *P_TimerA_Data = 0xffff - 256;

    *P_TimerA_Ctrl = C_SourceA_1 | C_SourceB_256Hz;

    *P_INT_Ctrl = C_IRQ1_TMA | C_IRQ6_TMB2 | C_IRQ5_2Hz;

    INT_IRQ();

}

void change_clock()

{  

unsigned int key_code = get_key();

    static unsigned int max;

    switch(key_code){   // key_code == 0 will do nothing

        case 1:

            switch( clock_status ){

            case CHGSECOND:

                if(++second == 60) second = 0;

                break;

            case CHGMINUTE:

                if(++minute == 60) minute = 0;

                break;

            case CHGHOUR:

                if(++hour == 24) hour =0;

                break;

            default:

                break;

            }

            break;

        case 2:

            switch( clock_status ){

            case CHGSECOND:

                if(--second == 0) second = 59;

                break;

            case CHGMINUTE:

                if(--minute == 0) minute = 59;

                break;

            case CHGHOUR:

                if(--hour == 0) hour = 23;

                break;

            default:

                break;

            }

            break;

        case 3:    

            switch( clock_status ){

            case RUN:

                clock_status = CHGSECOND;

                break;

            case CHGSECOND:

                clock_status = CHGMINUTE;

                break;

            case CHGMINUTE:

                clock_status = CHGHOUR;

                break;

            case CHGHOUR:

                clock_status = RUN;

                break;

            }

            break;

        default:

            break;

    }

}

int main()

{  

init();

    while(1){

        change_clock();    

        if(show_second){

            display(5, second % 10);

            delay(1);  

            display(4, second / 10);

            delay(1);

        }

        if(show_minute){

            display(3, minute % 10);

            delay(1);

            display(2, minute / 10);

            delay(1);

        }

        if(show_hour){

            display(1, hour % 10);

            delay(1);

            display(0, hour / 10);

            delay(1);

        }

    }

}

void IRQ1()

{

    //时钟计数中断

    if( (C_IRQ1_TMA & *P_INT_Ctrl) != 0 )

    {   if( clock_status == RUN )

        {   second++;

            if(second >= 60 ) second=0, minute++;

            if(minute >= 60 ) minute=0, hour++;

            if(hour >= 24 ) hour=0;

        }

        *P_INT_Clear = C_IRQ1_TMA;

    }

}

void IRQ5()

{// 数码管闪烁

    if( (C_IRQ5_2Hz & *P_INT_Ctrl) != 0)

    {

switch(clock_status){

        case RUN:

            opposite_dots();

            show_hour = show_minute = show_second = 0xffff;

            break;

        case CHGSECOND:

            show_second ^= 0xffff;

            show_minute = show_hour = 0xffff;

            break;

        case CHGMINUTE:

            show_minute ^= 0xffff;

            show_second = show_hour = 0xffff;

            break;

        case CHGHOUR:

            show_hour ^= 0xffff;

            show_second = show_minute = 0xffff;

            break;

        }

        *P_INT_Clear = C_IRQ5_2Hz;

    }

}

void IRQ6()

{   // 每10ms扫描一次键盘

    static unsigned int old_key = 0;       

    static unsigned int key_count = 0;

    unsigned int current_key;

    if( (C_IRQ6_TMB2 & *P_INT_Ctrl) != 0)

    {   current_key = *P_IOA_Data & 0x0007;

        if( current_key != 0)

        {           //有按键

            if( key_status == NOKEY )  

            {   old_key = current_key;

                key_count++;

                key_status = PRESSING;

            }else{

                if( current_key == old_key) //不相等，抖动

                {

                    if( ++key_count >= 5)  

//有>5次扫描的值相等，说明不是抖动，判断按键值

                    {   if(current_key == 0x0001) key_code = 1;

                        if(current_key == 0x0002) key_code = 2;

                        if(current_key == 0x0004) key_code = 3;

                    }

                }else{

                    // 抖动

                    old_key = 0;

                    key_count = 0;

                    key_status = NOKEY;

                }

            }

        }else{          //无按键

            old_key = 0;

            key_count = 0;

            if( key_status == PRESSING ) key_status = PRESSED;  //按键释放了

        }

        *P_INT_Clear = C_IRQ6_TMB2;

    }

}