Ciaran O'Malley / Mbed 2 deprecated LAB_2_3_1_Debounce

Lab 2.3.1 Debounce

Dependencies:   mbed C12832

main.cpp@0:0853f795e63b, 2020-06-20 (annotated)

Committer:
ciaranom
Date:
Sat Jun 20 11:16:58 2020 +0000
Revision:
0:0853f795e63b
Child:
1:7149c0779e5b
Lab exercise 2.3 Interrupt;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ciaranom 0:0853f795e63b 1 #include "mbed.h"
ciaranom 0:0853f795e63b 2 #include "C12832.h"
ciaranom 0:0853f795e63b 3
ciaranom 0:0853f795e63b 4 InterruptIn joystickcenter(p14);
ciaranom 0:0853f795e63b 5 InterruptIn button(p9);
ciaranom 0:0853f795e63b 6 DigitalOut led(LED1);
ciaranom 0:0853f795e63b 7 DigitalOut flash(LED4);
ciaranom 0:0853f795e63b 8 C12832 lcd(p5, p7, p6, p8, p11);
ciaranom 0:0853f795e63b 9
ciaranom 0:0853f795e63b 10
ciaranom 0:0853f795e63b 11 DigitalIn fire(p14);
ciaranom 0:0853f795e63b 12 PwmOut spkr(p26);
ciaranom 0:0853f795e63b 13 AnalogIn pot1(p19);
ciaranom 0:0853f795e63b 14
ciaranom 0:0853f795e63b 15
ciaranom 0:0853f795e63b 16
ciaranom 0:0853f795e63b 17 int x = 0;
ciaranom 0:0853f795e63b 18 Timer debounce;
ciaranom 0:0853f795e63b 19
ciaranom 0:0853f795e63b 20 void flip() {
ciaranom 0:0853f795e63b 21 led = !led; // toggles the led when the joystick button is pressed.
ciaranom 0:0853f795e63b 22 x = 1;
ciaranom 0:0853f795e63b 23 lcd.printf("debounce = "+debounce.read_ms());
ciaranom 0:0853f795e63b 24 if(debounce.read_ms()==1)
ciaranom 0:0853f795e63b 25 {
ciaranom 0:0853f795e63b 26 lcd.printf("ms 150");
ciaranom 0:0853f795e63b 27 //assignment
ciaranom 0:0853f795e63b 28 }
ciaranom 0:0853f795e63b 29 debounce.reset();
ciaranom 0:0853f795e63b 30 }
ciaranom 0:0853f795e63b 31 int main() {
ciaranom 0:0853f795e63b 32
ciaranom 0:0853f795e63b 33 joystickcenter.rise(&flip); // attach the function address to the rising edge
ciaranom 0:0853f795e63b 34 button.mode(PullUp); // With this, no external pullup resistor needed
ciaranom 0:0853f795e63b 35 button.rise(&flip); // attach the function address to the rising edge
ciaranom 0:0853f795e63b 36
ciaranom 0:0853f795e63b 37 while(1) { // wait around, interrupts will interrupt this!
ciaranom 0:0853f795e63b 38 flash = !flash; // turns LED4 on if off, off if on
ciaranom 0:0853f795e63b 39 //wait(0.25); // the instruction to wait for a quarter-second
ciaranom 0:0853f795e63b 40 if(x==1) // check loop
ciaranom 0:0853f795e63b 41 {
ciaranom 0:0853f795e63b 42 //lcd.printf("Variable set");
ciaranom 0:0853f795e63b 43 x = 0;
ciaranom 0:0853f795e63b 44 }
ciaranom 0:0853f795e63b 45
ciaranom 0:0853f795e63b 46 for (float i=2000.0; i<1000.0; i+=100) {
ciaranom 0:0853f795e63b 47 spkr.period(1.0/i);
ciaranom 0:0853f795e63b 48 spkr=0.5;
ciaranom 0:0853f795e63b 49 wait(0.1);
ciaranom 0:0853f795e63b 50 }
ciaranom 0:0853f795e63b 51 spkr=0.0;
ciaranom 0:0853f795e63b 52 while(pot1.read() < 0.0000005) {} // this uses the pot to control the program
ciaranom 0:0853f795e63b 53
ciaranom 0:0853f795e63b 54
ciaranom 0:0853f795e63b 55
ciaranom 0:0853f795e63b 56
ciaranom 0:0853f795e63b 57 }
ciaranom 0:0853f795e63b 58 }
ciaranom 0:0853f795e63b 59
ciaranom 0:0853f795e63b 60
ciaranom 0:0853f795e63b 61 //What's needed is a global variable with its own name, for example:
ciaranom 0:0853f795e63b 62 //int x;
ciaranom 0:0853f795e63b 63
ciaranom 0:0853f795e63b 64 //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 0:0853f795e63b 65
ciaranom 0:0853f795e63b 66 //(Be very careful about this. x=1 sets x to 1. x==1 compares x to 1.)