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.
Usage

Usage guide

  1. #include"keypad.h"
  2. #include"lcd.h"
  3. #include "delay.h"
  4.  
  5.  
  6. /* Program to demonstrate the hex-Keypad interface*/
  7. int main()
  8. {
  9. uint8_t key;
  10. LCD_Init(8,2,16); /*Initialize the 2x16 LCD in 8-bit mode */
  11. KEYPAD_Init(); /*Configure the ROWs and COLUMNs for keypad scanning*/
  12.  
  13. while(1)
  14. {
  15. key = KEYPAD_GetKey(); /*Get the Ascii value of the key Pressed */
  16. LCD_DisplayChar(key); /*Display the key pressed */
  17. }
  18.  
  19. return 0;
  20. }