Write and test a C program for STK$500$ board that repeatedly lets the user enter a digit by pressing a

button on the $4$ x $3$ keypad. The program then displays the digit on the $7-$segment display. Name your program as lab$1$t$4.$c$.$

The $4$ x $3$ keypad is to be connected to Port B of the STK$500$ board.

The $7-$segment display is to be connected to Port A of the STK$500$ board.

Based on the code that you have written for Task $4,$ create two C functions read$\_$keypad$()$ and display$\_7$led$().$ The Function read$\_$keypad$()$ should return the ASCII code of the key button that has been pressed on the keypad. If no key is pressed, the function will return $0.$ The keypad is assumed to be connected to Port A$.$

unsigned char read$\_$keypad$()\{$

$//$ your code here

$\}$

The Function display$\_7$led$()$ should accept the ASCII code of a character, and display the character on the $7-$segment display. The $7-$segment display is assumed to be connected to Port B$.$

void display$\_7$led$($unsigned char a$)\{$

$//$ your code here

$\}$

Write and test a C program called lab$1$t$5.$c that uses the two functions above to achieve the same functionality as in Task $4$Reading a keypad press and showing on the $7-$segment display$.$