2013八路抢答器课程设计(5)

//蜂鸣器发声延时 void DelayMS(uint x) { uchar t; while(x--) for(t=0;t<100;t++); }

//数码管显示驱动函数

void display(uchar number,uchar second) {

uchar second_first,second_second; second_first = second / 10; second_second = second % 10; P0 =0x00; P2 = 0xfe;

P0 = table[number]; delay(2); P0 =0x00; P2 = 0xfd; P0 = 0x40; delay(2); P0 =0x00;

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P2 = 0xfb;

P0 = table[second_first]; delay(2); P0 =0x00; P2 = 0xf7;

P0 = table[second_second]; delay(2); P0 =0x00; }

//蜂鸣器响应按周期t发音 void Play(uchar t) { uchar i; for(i=0;i<1;i++) {

BEEP=~BEEP; DelayMS(t); } BEEP=0; }

//开始键扫描函数 void start_stop_keyscan()

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{

if(start_stop == 0) { delay(8);

if((start_stop == 0)&&(!start_stop_flag)) {

start_stop_flag = 1; action = 1; TR0 = 1; state = 0; } } else {

start_stop_flag = 0; } }

//八位抢答键扫描函数 char key_scan8() {

if(key1 == 0) {

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delay(8);

if((key1 == 0)&&(!key1_flag)) {

key1_flag = 1;

number = 1; number_display = number; } } else {

key1_flag = 0;

number = 0; }

if(key2 == 0) { delay(8);

if((key2 == 0)&&(!key2_flag)) {

key2_flag = 1;

number = 2; number_display = number; }

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} else {

key2_flag = 0;

number = 0; }

if(key3 == 0) { delay(8); if(key3 == 0) { delay(8);

if((key3 == 0)&&(!key3_flag)) {

key3_flag = 1; number=3;

number_display=number; } else {

key3_flag=0; number=0;

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