电子系统课程设计
delay(8);
if((key6 == 0)&&(!key6_flag)) {
key6_flag = 1;
number = 6; number_display = number; } } else {
key6_flag = 0; number = 0; }
if(key7 == 0) {
delay(8);
if((key7 == 0)&&(!key7_flag)) {
key7_flag = 1;
number = 7; number_display = number; } } else {
key7_flag = 0;
number = 0; }
if(key8 == 0)
20
电子系统课程设计
{
delay(8);
if((key8 == 0)&&(!key8_flag))
{
key8_flag = 1;
number = 8; number_display = number; }
}
else
{
key8_flag = 0;
number = 0;
}
if(number_display != 0) {
return 1; } else {
return 0; } }
//复位键扫描函数 void reset_keyscan() {
if(reset == 0) {
21
电子系统课程设计
delay(8);
if((reset == 0)&&( !reset_flag)) {
reset_flag = 1; number_display = 0; state = 1; } } else {
reset_flag = 0; } } //主函数 void main() {
uint t;
TMOD=0x01;
TH0=(65536-50000)/256; TL0=(65536-50000)%6; EA= 1; ET0= 1; TR0=0; while( 1) {
if(number_display!=0)
Play(number_display/2);
start_stop_keyscan();
22
//蜂鸣器发声
电子系统课程设计
reset_keyscan();
while(action) {
while(!key_scan8())
{
display(number_display,second); if(second == 0) {
second = 20; break; } } TR0 = 0;
display(number_display,second); action = 0; break; }
display(number_display,second); } }
//中断服务函数
void timer0() interrupt 1 {
uint i;
TH0=(65536-50000)/256; TL0=(65536-50000)%6;
timer0_count ++; if(timer0_count == 20)
23
