mt2523 [keypad]General GPIO can be used as keypad pin？

1.No, keypad driver only support hardware detect key, only use the special GPIO which have KEYPAD mode to detect key.


2、The keypad column pins are GPIO18~20, the row pins are GPIO21~23.



3、When use keypad ， you should ensure at least one column and one row.


4、If you want to use general GPIO as keypad , you cannot use hardware keypad module to detect key, and mustachieve keypad scan flow by your own software.