Numeric keypad with STM32F429I-Disco guidance
Attached is the Demo file that I did get to work and If I remeber correctly, it had some button functions in it too.
But, They didn’t do anything except blink when you touched them I believe that it was only meant for as a demo or is an unfinished project or part of a project were I may have faile to include some of the other files and left them out of it.
Maybe there is something in that code to help you.
jer 
;){kind=link}