51单片机单片机(AT89C52)一键多功能一键多功能(短按、长按短按、长按)
短按(按下持续时间小于3s)一次数码管显示加1，同时流水灯计数加1。长按(按下持续时间大于3s)时，数码管显示每500ms加1，
同时流水灯每500ms计数加1。
#include
typedefunsignedcharuchar;
typedefunsignedintuint;
#defineNOKEY0
#defineKEYDOWN1
#defineKEYUP2
ucharkeystate;
sbitkey=P2^7;
voidkeyscan(void);
uchartimeflag;
ucharcodetable[]=
{
0x80,0xf2,0x48,0x60,
0x32,0x24,0x04,0xf0,
0x00,0x20,0x10,0x06,
0x8c,0x42,0x0c,0x1c
};
uchari;
voidmain(void)
{
TMOD=0x10;
TH1=(65536-50000)/256;
TL1=(65536-50000)%256;
EA=1;
ET1=1;
TR1=1;
while(1)
{
if(timeflag)
{
timeflag=0;
keyscan();
}
}
}
voidkeyscan(void)
{
staticuchariscontinue=0;
P2|=0x80;
switch(keystate)
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