Niels Balemans / Mbed OS PGO6_VoteController_Niels_Balemans_

vote controller

Dependencies:   MQTT

Fork of PGO6_VoteController_template by Jens de hoog

debounce_button.cpp@3:062b94b59b1b, 2018-10-11 (annotated)

Committer:
niels_balemans
Date:
Thu Oct 11 16:06:17 2018 +0000
Revision:
3:062b94b59b1b
Parent:
2:5b7d055dbc91 
portfolio vote controller

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jensdehoog 0:fd29cd85e75e 1 #include "debounce_button.h"
jensdehoog 0:fd29cd85e75e 2
jensdehoog 0:fd29cd85e75e 3 /**
jensdehoog 0:fd29cd85e75e 4 Some tips and tricks:
jensdehoog 0:fd29cd85e75e 5 - To use the built-in LED:
jensdehoog 0:fd29cd85e75e 6 DigitalOut led1(LED1);
jensdehoog 0:fd29cd85e75e 7 ...
jensdehoog 0:fd29cd85e75e 8 led1 = 1;
jensdehoog 0:fd29cd85e75e 9 - To delay the call of a function:
jensdehoog 0:fd29cd85e75e 10 Timeout someTimeout;
jensdehoog 0:fd29cd85e75e 11 ...
jensdehoog 2:5b7d055dbc91 12 someTimeout.attach(callback(&someFunction), 0.5) with 0.5 as 500 milliseconds
jensdehoog 0:fd29cd85e75e 13 - The variables that are used in interrupt callbacks have to be volatile,
jensdehoog 0:fd29cd85e75e 14 because these variables can change at any time. Therefore, the compiler is not
jensdehoog 0:fd29cd85e75e 15 going to make optimisations.
jensdehoog 0:fd29cd85e75e 16 */
jensdehoog 0:fd29cd85e75e 17
niels_balemans 3:062b94b59b1b 18 volatile bool button1_pressed = false;
niels_balemans 3:062b94b59b1b 19 volatile bool button1_enabled = true;
niels_balemans 3:062b94b59b1b 20 volatile bool button1_busy = false;
niels_balemans 3:062b94b59b1b 21 volatile int multiclick_state = 0;
niels_balemans 3:062b94b59b1b 22 int counter = 0;
niels_balemans 3:062b94b59b1b 23 DigitalOut myled(LED1);
niels_balemans 3:062b94b59b1b 24 Timeout debouncer_delay;
niels_balemans 3:062b94b59b1b 25 Timeout busy_delay;
niels_balemans 3:062b94b59b1b 26 DigitalOut led2(LED2);
niels_balemans 3:062b94b59b1b 27
niels_balemans 3:062b94b59b1b 28 void showPresses() {
niels_balemans 3:062b94b59b1b 29 for(int i = 0; i < multiclick_state; i++) {
niels_balemans 3:062b94b59b1b 30 led2 = 1;
niels_balemans 3:062b94b59b1b 31 wait(1);
niels_balemans 3:062b94b59b1b 32 led2 = 0;
niels_balemans 3:062b94b59b1b 33 wait(1);
niels_balemans 3:062b94b59b1b 34 }
niels_balemans 3:062b94b59b1b 35 }
niels_balemans 3:062b94b59b1b 36
jensdehoog 0:fd29cd85e75e 37 /**
jensdehoog 2:5b7d055dbc91 38 TODO
jensdehoog 2:5b7d055dbc91 39 ----
jensdehoog 2:5b7d055dbc91 40 This function:
jensdehoog 2:5b7d055dbc91 41 - stores the amount of clicks in a variable which is read by the main loop.
jensdehoog 2:5b7d055dbc91 42 - resets the click counter which is used inside this file.
jensdehoog 2:5b7d055dbc91 43 - lowers a flag which tells the main loop that the user stopped pressing the button
jensdehoog 2:5b7d055dbc91 44 such that it can proceed its program.
jensdehoog 2:5b7d055dbc91 45 - turns the built-in LED off. Therefore, the user gets informed that the program stopped counting the clicks.
jensdehoog 2:5b7d055dbc91 46 */
jensdehoog 2:5b7d055dbc91 47 void button1_multiclick_reset_cb(void) {
niels_balemans 3:062b94b59b1b 48 multiclick_state = counter;
niels_balemans 3:062b94b59b1b 49 counter = 0;
niels_balemans 3:062b94b59b1b 50 button1_busy = false;
niels_balemans 3:062b94b59b1b 51 myled = 0;
niels_balemans 3:062b94b59b1b 52 //showPresses();
jensdehoog 2:5b7d055dbc91 53 }
jensdehoog 2:5b7d055dbc91 54
jensdehoog 2:5b7d055dbc91 55 /**
jensdehoog 2:5b7d055dbc91 56 TODO
jensdehoog 2:5b7d055dbc91 57 ----
jensdehoog 2:5b7d055dbc91 58 This function enables the button again, such that unwanted clicks of the bouncing button get ignored.
jensdehoog 0:fd29cd85e75e 59 */
niels_balemans 3:062b94b59b1b 60 void button1_enabled_cb(void) {
niels_balemans 3:062b94b59b1b 61 button1_enabled = true;
jensdehoog 2:5b7d055dbc91 62 }
jensdehoog 0:fd29cd85e75e 63
jensdehoog 2:5b7d055dbc91 64 /**
jensdehoog 2:5b7d055dbc91 65 TODO
jensdehoog 2:5b7d055dbc91 66 ----
jensdehoog 2:5b7d055dbc91 67 This function:
jensdehoog 2:5b7d055dbc91 68 - turns the built-in LED on, so the user gets informed that the program has started with counting clicks
jensdehoog 2:5b7d055dbc91 69 - disables the button such that the debouncer is active
jensdehoog 2:5b7d055dbc91 70 - enables the button again after a certain amount of time
jensdehoog 2:5b7d055dbc91 71 (use interrupts with "button1_enabled_cb()" as callback.
jensdehoog 2:5b7d055dbc91 72 - counts the amount of clicks within a period of 1 second
jensdehoog 2:5b7d055dbc91 73 - informs the main loop that the button has been pressed
jensdehoog 2:5b7d055dbc91 74 - informs the main loop that the user is clicking the button.
jensdehoog 2:5b7d055dbc91 75 Therefore, this main loop cannot continue its procedure until the clicks within 1 second have been counted.
jensdehoog 2:5b7d055dbc91 76 */
jensdehoog 0:fd29cd85e75e 77 void button1_onpressed_cb(void)
jensdehoog 0:fd29cd85e75e 78 {
niels_balemans 3:062b94b59b1b 79 if (button1_enabled) { // Disabled while the button is bouncing
niels_balemans 3:062b94b59b1b 80 button1_enabled = false;
niels_balemans 3:062b94b59b1b 81 button1_pressed = true; // To be read by the main loop
niels_balemans 3:062b94b59b1b 82 debouncer_delay.attach(callback(button1_enabled_cb), 0.05); // Debounce time 50 ms
niels_balemans 3:062b94b59b1b 83 counter++;
niels_balemans 3:062b94b59b1b 84 if(!button1_busy) {
niels_balemans 3:062b94b59b1b 85 myled = 1;
niels_balemans 3:062b94b59b1b 86 button1_busy = true;
niels_balemans 3:062b94b59b1b 87 busy_delay.attach(callback(button1_multiclick_reset_cb), 1);
niels_balemans 3:062b94b59b1b 88 }
niels_balemans 3:062b94b59b1b 89 }
jensdehoog 0:fd29cd85e75e 90 }