?? key.c
字號:
#include <at89x51.h>
#include "Key.h"
typedef unsigned char uchar;
bit g_KeyDown;
data unsigned char g_KeyValue;
void key_down(void) interrupt 0 using 1
{
EX0=0;
if(g_KeyDown) //if has Old Key Discard New Key
{
EX0=1;
return;
}
g_KeyDown=1;
g_KeyValue=P1;
g_KeyValue=g_KeyValue & 0x0f;
EX0=1;
}
uchar WaitKey()
{
uchar t;
g_KeyDown=0;
while(!g_KeyDown){};
t=g_KeyValue;
g_KeyDown=0;
return t;
}
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