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unsigned char Key_Scan(void)
{
unsigned char LastKey;
unsigned int PushTime = 0;
unsigned char LongPressFlag = 0;
if (Key_Read() == NOKEY) {KeyTime = KEYTIME_FIRST; return NOKEY;} //
Key_DelayNms(20);
if (Key_Read() == NOKEY) {return NOKEY;}
LastKey = Key_Read();
while(Key_Read() == LastKey)
{
Key_DelayNms(1);
Key_Ondo();
PushTime++;
if (PushTime >= KeyTime)
{
***** if (KeyTime == KEYTIME_FIRST) KeyTime = KEYTIME_SLOW;
***** if (KeyTime > KEYTIME_FAST) KeyTime -= KEYTIME_STEP;
LongPressFlag = 1;
break;
}
}
those two lines marked with *****,i don't understand why they exist ,if PushTime >=KeyTime means this key value is valid,and give a LongPressFlag,what the two lines for???
{
unsigned char LastKey;
unsigned int PushTime = 0;
unsigned char LongPressFlag = 0;
if (Key_Read() == NOKEY) {KeyTime = KEYTIME_FIRST; return NOKEY;} //
Key_DelayNms(20);
if (Key_Read() == NOKEY) {return NOKEY;}
LastKey = Key_Read();
while(Key_Read() == LastKey)
{
Key_DelayNms(1);
Key_Ondo();
PushTime++;
if (PushTime >= KeyTime)
{
***** if (KeyTime == KEYTIME_FIRST) KeyTime = KEYTIME_SLOW;
***** if (KeyTime > KEYTIME_FAST) KeyTime -= KEYTIME_STEP;
LongPressFlag = 1;
break;
}
}
those two lines marked with *****,i don't understand why they exist ,if PushTime >=KeyTime means this key value is valid,and give a LongPressFlag,what the two lines for???
