Assignment

Write a program using the GPIO method that performs the same tasks as the interrupt code snippet gmen in Listing $1.$ Observe that listing $1$ simply defines that the CPU waits in an infinite loop formed by the code line while$($true$)$ When the user presses the button, this loop is interrupted. The CPU executes the function getButtons$\_$callback. Afterward, ir turns back and waits in the infinite loop for another interrupt. You should use Mbed Studio.

Listing $1$: Interrupt Code

Hundef ARM$\_$FP

Hinclude "mbed $h^2$

Digitalout greenLED$($LED$1).$

interruptin userButton$($BuTtoN$1)$:

vaid getbuttons$()$

$1$

green $ED=$ igreenteD;

$1$

int main$|)$

is

green $LD=0,$

userButton fall$(8$ getRuttons$)$;

$1/\_$enabie$\_$rall:

while $($true$)$:

$1$