Ciaran O'Malley / Mbed 2 deprecated Debounce

Lab exercise 2.3.1

Dependencies:   mbed C12832

main.cpp@0:674c09240a19, 2020-06-20 (annotated)

Committer:
ciaranom
Date:
Sat Jun 20 11:15:38 2020 +0000
Revision:
0:674c09240a19
Lab exercise 2.3

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ciaranom 0:674c09240a19 1 #include "mbed.h"
ciaranom 0:674c09240a19 2 #include "C12832.h"
ciaranom 0:674c09240a19 3
ciaranom 0:674c09240a19 4 InterruptIn joystickcenter(p14);
ciaranom 0:674c09240a19 5 InterruptIn button(p9);
ciaranom 0:674c09240a19 6 DigitalOut led(LED1);
ciaranom 0:674c09240a19 7 DigitalOut flash(LED4);
ciaranom 0:674c09240a19 8 C12832 lcd(p5, p7, p6, p8, p11);
ciaranom 0:674c09240a19 9 Timer debounce;
ciaranom 0:674c09240a19 10
ciaranom 0:674c09240a19 11 int x;
ciaranom 0:674c09240a19 12
ciaranom 0:674c09240a19 13
ciaranom 0:674c09240a19 14 void flip() {
ciaranom 0:674c09240a19 15 lcd.cls();
ciaranom 0:674c09240a19 16 led = !led; // toggles the led when the joystick button is pressed.
ciaranom 0:674c09240a19 17 x = 1;
ciaranom 0:674c09240a19 18 //wait(0.5);
ciaranom 0:674c09240a19 19
ciaranom 0:674c09240a19 20 if (debounce.read_ms() < 10000){
ciaranom 0:674c09240a19 21 //lcd.locate(0,0);
ciaranom 0:674c09240a19 22 //lcd.printf("Debounce value: %.3f \n"+ debounce.read_ms());
ciaranom 0:674c09240a19 23 }
ciaranom 0:674c09240a19 24 debounce.reset();
ciaranom 0:674c09240a19 25 }
ciaranom 0:674c09240a19 26 int main() {
ciaranom 0:674c09240a19 27
ciaranom 0:674c09240a19 28 joystickcenter.rise(&flip); // attach the function address to the rising edge
ciaranom 0:674c09240a19 29 button.mode(PullUp); // With this, no external pullup resistor needed
ciaranom 0:674c09240a19 30 button.rise(&flip); // attach the function address to the rising edge
ciaranom 0:674c09240a19 31
ciaranom 0:674c09240a19 32 while(1) { // wait around, interrupts will interrupt this!
ciaranom 0:674c09240a19 33 flash = !flash; // turns LED4 on if off, off if on
ciaranom 0:674c09240a19 34 wait(0.25); // the instruction to wait for a quarter-second
ciaranom 0:674c09240a19 35 if (x==1)
ciaranom 0:674c09240a19 36 {
ciaranom 0:674c09240a19 37 lcd.printf("Variable set");
ciaranom 0:674c09240a19 38 x=0;
ciaranom 0:674c09240a19 39 }
ciaranom 0:674c09240a19 40 }
ciaranom 0:674c09240a19 41 }
ciaranom 0:674c09240a19 42
ciaranom 0:674c09240a19 43
ciaranom 0:674c09240a19 44 //What's needed is a global variable with its own name, for example:
ciaranom 0:674c09240a19 45 //int x;
ciaranom 0:674c09240a19 46
ciaranom 0:674c09240a19 47 //Now, you set x to 1 inside the flip() function. In main(), inside the infinite loop starting with while (1) { , you check whether x ==1 and if it is, you print to the LCD and set x to 0.
ciaranom 0:674c09240a19 48
ciaranom 0:674c09240a19 49 //(Be very careful about this. x=1 sets x to 1. x==1 compares x to 1.)