KEYPAD

KEYPAD_Init

{{#Widget:LibTable}}
Defination void KEYPAD_Init()
Input Arguments none
Return Value none
Description This function configures the rows and columns for keypad scan.
  • ROW lines are configured as Output.
  • Column Lines are configured as Input.
Usage



KEYPAD_GetKey

{{#Widget:LibTable}}
Defination unsigned char KEYPAD_GetKey()
Input Arguments none
Return Value uint8_t--> ASCII value of the Key Pressed
Description This function waits till a key is pressed and returns its ASCII Value.

It follows the following sequences to decode the key pressed:

  • Wait till the previous key is released..
  • Wait for the new key press.
  • Scan all the rows one at a time for the pressed key.
  • Decodes the key pressed depending on ROW-COL combination and returns its

ASCII value.

Usage



Usage guide=