#include

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#include

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$/**$ CODE: Write your code for Ex $7\mathrm{.}7$ below this line. $*/$

$/**$ CODE: Write your code for Ex $7\mathrm{.}7$ above this line. $*/$

#include "qutyio.h$"$

$/**$ Tutorial $07$

INTRODUCTION:

In this week's tutorial you will implement a stopwatch. This stopwatch

is controlled using the pushbuttons and increments every one sixteenth

of a second. The elapsed time is displayed on the $7-$segment display in

hexadecimal sixteenths of a second $($i$.$e$.,0$x$01$ represents $0\mathrm{.}0625$ s$).$

Pushbutton functionality is described below:

$-$ Pushbutton S$1$ starts the stopwatch

$-$ Pushbutton S$2$ stops the stopwatch

$-$ Pushbutton S$4$ resets the elapsed time back to $0$x$00$

Once the stopwatch reaches $0$xFF$,$ it will stop increasing.

$*/$

$/**$ EX: $7\mathrm{.}0$

See include$/$initialisation$.$c$.$

$*/$

$/**$ EX: $7\mathrm{.}1$

See include$/$initialisation$.$c$.$

$*/$

$/**$ EX: $7\mathrm{.}2$

See src$/$timer$.$c$.$

$*/$

$/**$ EX: $7\mathrm{.}3$

See src$/$timer$.$c$.$

$*/$

$/**$ EX: $7\mathrm{.}4$

See src$/$timer$.$c$.$

$*/$

$/**$ EX: $7\mathrm{.}5$

See include$/$timer$.$h$.$

$*/$

$/**$ EX: $7\mathrm{.}6$

See src$/$buttons$.$c$.$

$*/$

int main$($void$)$

$\{$

$//$ Configures pins PA$1,$ PC$0,$ and PC$2,$ to drive the $7-$segment display

display$\_$init$()$;

$//$ Drives DISP EN net HIGH

display$\_$on$()$;

$/**$ EX: $7\mathrm{.}7$

TASK: Include the header file containing the initialisation

functions you wrote in Ex $7\mathrm{.}0,$ and call these functions below.

NOTE: This header file should be included at the top of this file.

$*/$

$/**$ CODE: Write your code for Ex $7\mathrm{.}7$ above this line. $*/$

$//$ This program is interrupt$-$driven and therefore does not need any

$//$ additional code in main$().$

while $(1)$

; $//$ Loop indefinitely

$\}$