#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;

}

}