Keypad header file for atmega

[Maisha]

Does anyone know a link to keypad header file for avr?

 

[Sadlercomfort]

Does anyone know a link to keypad header file for avr?

There's a header file at the bottom of this page: https://people.ece.cornell.edu/land/courses/ece4760/keypadRW88/keypad.html

 

[Maisha]

If we want to read data in the lcd to use with the our code how should we change the R/W pin.?In this case is it connected to a MCU pin Or to thr GND .?

 

[Sadlercomfort]

It is common for the R/W pin to be tied to GND when not in use (to save MCU pins), which means you can only write data to the LCD.

If you wish to read and write data to the LCD, you can connect the R/W to a MCU pin... Now you can set LOW to write data, HIGH to read data.