EE$242$ Laboratory Manual

Session $8$: General Purpose Input$-$Output

$($GPIO$)$ and Interrupt

Yeditepe University

Spring $2024$

Assignment

Assume that the green LED is initially off. Design such a system that by using an interrupt and calling

ISR$\_$callback function $($you can define any function$),$ toggle the green LED on the Nucleo L$073$RZ

board contimuously. The interrupt code in Listing $1$ should simply define that the CPU waits in an

infinite loop. When the user presses the button, this loop is interrupted. The CPU executes the function

that you define. Afterward, it turns back and waits in the infinite loop for another interrupt.

a$)$ Fill in the empty blocks in the below C code $($in Listing $1)$ to perform the required

operations.

b$)$ Write also another program using the GPIO method that performs the same tasks as the

Interrupt code snippet given in Listing $1.$ You should use Mbed Studio.

#undef$\_$ARM$\_$FP

#include "mbed. $h"$

$//$ Port and interrupt settings

$//$ execute the function ISR$\_$callback, as the button is pressed, turn on or off$($toggle$)$ the LED

int main$()$

$\{$

$//$ LED will be off initially

$//$ generate the interrupt and call the ISR$\_$callback function which is defined by the user

$//$ let the CPU waits in an infinite loop

$\}$