Sarah Marsh / Mbed OS app-shield-joystick

A program to demonstrate using the joystick of the mbed application shield.

Dependencies:   C12832

Fork of app-shield-joystick by Chris Styles

main.cpp@5:47721be170f9, 2017-09-19 (annotated)

Committer:
sarahmarshy
Date:
Tue Sep 19 16:59:28 2017 +0000
Revision:
5:47721be170f9
Parent:
2:507020c78d79 
Update example program to move a ball around the screen

Who changed what in which revision?

UserRevisionLine numberNew contents of line
chris 0:0325ecbd1916 1 #include "mbed.h"
sarahmarshy 5:47721be170f9 2 #include "C12832.h"
sarahmarshy 5:47721be170f9 3
sarahmarshy 5:47721be170f9 4 // Max X value of LCD screen
sarahmarshy 5:47721be170f9 5 #define MAX_X 124
sarahmarshy 5:47721be170f9 6 // Max Y value of LCD screen
sarahmarshy 5:47721be170f9 7 #define MAX_Y 28
chris 0:0325ecbd1916 8
sarahmarshy 5:47721be170f9 9 struct ball_t {
sarahmarshy 5:47721be170f9 10 int y;
sarahmarshy 5:47721be170f9 11 int x;
sarahmarshy 5:47721be170f9 12 };
sarahmarshy 5:47721be170f9 13 ball_t ball; // Keep track of ball's x and y
sarahmarshy 5:47721be170f9 14 C12832 lcd(D11, D13, D12, D7, D10);
chris 0:0325ecbd1916 15
sarahmarshy 5:47721be170f9 16 // Joystick Pins
chris 2:507020c78d79 17 DigitalIn up(A2);
chris 2:507020c78d79 18 DigitalIn down(A3);
chris 2:507020c78d79 19 DigitalIn left(A4);
sarahmarshy 5:47721be170f9 20 DigitalIn right(A5);
chris 2:507020c78d79 21 DigitalIn fire(D4);
chris 0:0325ecbd1916 22
sarahmarshy 5:47721be170f9 23 void draw_ball() {
sarahmarshy 5:47721be170f9 24 // Clear LCD
sarahmarshy 5:47721be170f9 25 lcd.cls();
sarahmarshy 5:47721be170f9 26 // Calculate ball's position based on joystick movement
sarahmarshy 5:47721be170f9 27 if(left){
sarahmarshy 5:47721be170f9 28 ball.x = ball.x > 0 ? ball.x-1 : MAX_X;
sarahmarshy 5:47721be170f9 29 }
sarahmarshy 5:47721be170f9 30 if(right) {
sarahmarshy 5:47721be170f9 31 ball.x = ball.x < MAX_X ? ball.x+1 : 0;
sarahmarshy 5:47721be170f9 32 }
sarahmarshy 5:47721be170f9 33 if(up) {
sarahmarshy 5:47721be170f9 34 ball.y = ball.y > 0 ? ball.y-1 : MAX_Y;
sarahmarshy 5:47721be170f9 35 }
sarahmarshy 5:47721be170f9 36 if(down) {
sarahmarshy 5:47721be170f9 37 ball.y = ball.y < MAX_Y ? ball.y+1 : 0;
sarahmarshy 5:47721be170f9 38 }
sarahmarshy 5:47721be170f9 39 if(fire){
sarahmarshy 5:47721be170f9 40 // Increment ball's x position by 10
sarahmarshy 5:47721be170f9 41 ball.x = ball.x < MAX_X-10 ? ball.x+10 : 10-(MAX_X-ball.x);
sarahmarshy 5:47721be170f9 42 }
sarahmarshy 5:47721be170f9 43
sarahmarshy 5:47721be170f9 44 lcd.fillcircle(ball.x, ball.y, 3, 1);
sarahmarshy 5:47721be170f9 45 }
chris 0:0325ecbd1916 46
chris 0:0325ecbd1916 47 int main()
chris 0:0325ecbd1916 48 {
sarahmarshy 5:47721be170f9 49 // Put the ball in the middle of the screen initially
sarahmarshy 5:47721be170f9 50 ball.x = MAX_X/2;
sarahmarshy 5:47721be170f9 51 ball.y = MAX_Y/2;
sarahmarshy 5:47721be170f9 52
sarahmarshy 5:47721be170f9 53 EventQueue queue;
sarahmarshy 5:47721be170f9 54 // Update the ball's position every 50 ms
sarahmarshy 5:47721be170f9 55 queue.call_every(50, draw_ball);
sarahmarshy 5:47721be170f9 56 queue.dispatch();
chris 0:0325ecbd1916 57 }
chris 0:0325ecbd1916 58
chris 0:0325ecbd1916 59