If the delay function is used to detect the key press, it will consume the memory of the microcontroller, which is not very good, so we have the following method:
unsigned char cnt1 = 0XFF;
cnt1 = (cnt1<<1)|KEY1;
if(cnt1!=0x00)
{
KeyLock = 0;
}
else if (KeyLock==0)
{
KeyNum = 1;
KeyLock = 1; //Prevent key triggering
}
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