中断及定时器的应用

#define uchar unsigned char

#define uint unsigned int

sbit K1=P3^7;

uchar i,second_count, key_flag_idx;

bit key_state;

uchar dsy_code[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};

void delayms(uint ms)

{

uchar i;

while(ms--) for(i=0;i<120;i++);

}

void key_event_handle()

{

if(key_state==0)

{

key_flag_idx=(key_flag_idx+1)%3;

switch(key_flag_idx)

{

case 1:IE=0x82;TR0=1;break;

case 2:IE=0x00;TR0=0;break;

case 0:P0=0x3f;P2=0x3f;i=0;second_count=0;

}

}

}

int main(void)

{

P0=0x3f;

P2=0x3f;

i=0;

second_count=0;

key_flag_idx=0;

key_state=1;

TMOD=0x01; //定时器0方式1

TH0=(65536-50000)/256;

TL0=(65536-50000)%256;

while(1)

{

if(key_state!=K1)

{

delayms(10);

key_state=K1;

key_event_handle();

}

}

}

void display_refresh() interrupt 1

{

TH0=(65536-50000)/256;

TL0=(65536-50000)%256;

if(++i==2) //50ms*2=0.1s 0.1s刷新一次

{

i=0;

second_count++;

P0=dsy_code[second_count/10];

P2=dsy_code[second_count%10];

if(second_count==100) second_count=0;

}

}