Ruben De Swaef / Mbed OS PGO6_VoteController_code

Votecontroller

Dependencies:   MQTT

Fork of PGO6_VoteController_template by Jens de hoog

debounce_button.cpp@5:592f4272c549, 2018-10-15 (annotated)

Committer:
rubends
Date:
Mon Oct 15 15:58:17 2018 +0000
Revision:
5:592f4272c549
Parent:
4:bb892177ce23 
Final

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jensdehoog 0:fd29cd85e75e 1 #include "debounce_button.h"
jensdehoog 0:fd29cd85e75e 2
rubends 3:793425387c91 3 DigitalOut led1(LED1);
rubends 3:793425387c91 4 volatile bool button1_busy = false;
rubends 3:793425387c91 5 volatile bool button1_enabled = true;
rubends 3:793425387c91 6 volatile int multiclick_state;
rubends 3:793425387c91 7 int clicks = 0;
rubends 3:793425387c91 8 Timeout clickResetTimeout;
rubends 3:793425387c91 9 Timeout btnEnableTimeout;
rubends 3:793425387c91 10
jensdehoog 0:fd29cd85e75e 11 /**
jensdehoog 0:fd29cd85e75e 12 Some tips and tricks:
jensdehoog 0:fd29cd85e75e 13 - To use the built-in LED:
jensdehoog 0:fd29cd85e75e 14 DigitalOut led1(LED1);
jensdehoog 0:fd29cd85e75e 15 ...
jensdehoog 0:fd29cd85e75e 16 led1 = 1;
jensdehoog 0:fd29cd85e75e 17 - To delay the call of a function:
jensdehoog 0:fd29cd85e75e 18 Timeout someTimeout;
jensdehoog 0:fd29cd85e75e 19 ...
jensdehoog 2:5b7d055dbc91 20 someTimeout.attach(callback(&someFunction), 0.5) with 0.5 as 500 milliseconds
jensdehoog 0:fd29cd85e75e 21 - The variables that are used in interrupt callbacks have to be volatile,
jensdehoog 0:fd29cd85e75e 22 because these variables can change at any time. Therefore, the compiler is not
jensdehoog 0:fd29cd85e75e 23 going to make optimisations.
jensdehoog 0:fd29cd85e75e 24 */
jensdehoog 0:fd29cd85e75e 25
jensdehoog 0:fd29cd85e75e 26 /**
jensdehoog 2:5b7d055dbc91 27 TODO
jensdehoog 2:5b7d055dbc91 28 ----
jensdehoog 2:5b7d055dbc91 29 This function:
jensdehoog 2:5b7d055dbc91 30 - stores the amount of clicks in a variable which is read by the main loop.
jensdehoog 2:5b7d055dbc91 31 - resets the click counter which is used inside this file.
jensdehoog 2:5b7d055dbc91 32 - lowers a flag which tells the main loop that the user stopped pressing the button
jensdehoog 2:5b7d055dbc91 33 such that it can proceed its program.
jensdehoog 2:5b7d055dbc91 34 - turns the built-in LED off. Therefore, the user gets informed that the program stopped counting the clicks.
jensdehoog 2:5b7d055dbc91 35 */
jensdehoog 2:5b7d055dbc91 36 void button1_multiclick_reset_cb(void) {
rubends 3:793425387c91 37 multiclick_state = clicks;
rubends 3:793425387c91 38 clicks = 0;
rubends 3:793425387c91 39 button1_busy = false;
rubends 3:793425387c91 40 led1 = 0;
jensdehoog 2:5b7d055dbc91 41 }
jensdehoog 2:5b7d055dbc91 42
jensdehoog 2:5b7d055dbc91 43 /**
jensdehoog 2:5b7d055dbc91 44 TODO
jensdehoog 2:5b7d055dbc91 45 ----
jensdehoog 2:5b7d055dbc91 46 This function enables the button again, such that unwanted clicks of the bouncing button get ignored.
jensdehoog 0:fd29cd85e75e 47 */
jensdehoog 2:5b7d055dbc91 48 void button1_enabled_cb(void)
jensdehoog 2:5b7d055dbc91 49 {
rubends 3:793425387c91 50 button1_enabled = true;
jensdehoog 2:5b7d055dbc91 51 }
jensdehoog 0:fd29cd85e75e 52
jensdehoog 2:5b7d055dbc91 53 /**
jensdehoog 2:5b7d055dbc91 54 TODO
jensdehoog 2:5b7d055dbc91 55 ----
jensdehoog 2:5b7d055dbc91 56 This function:
jensdehoog 2:5b7d055dbc91 57 - turns the built-in LED on, so the user gets informed that the program has started with counting clicks
jensdehoog 2:5b7d055dbc91 58 - disables the button such that the debouncer is active
jensdehoog 2:5b7d055dbc91 59 - enables the button again after a certain amount of time
jensdehoog 2:5b7d055dbc91 60 (use interrupts with "button1_enabled_cb()" as callback.
jensdehoog 2:5b7d055dbc91 61 - counts the amount of clicks within a period of 1 second
jensdehoog 2:5b7d055dbc91 62 - informs the main loop that the button has been pressed
jensdehoog 2:5b7d055dbc91 63 - informs the main loop that the user is clicking the button.
jensdehoog 2:5b7d055dbc91 64 Therefore, this main loop cannot continue its procedure until the clicks within 1 second have been counted.
jensdehoog 2:5b7d055dbc91 65 */
jensdehoog 0:fd29cd85e75e 66 void button1_onpressed_cb(void)
jensdehoog 0:fd29cd85e75e 67 {
rubends 3:793425387c91 68 if(!button1_busy){ // start clicking
rubends 3:793425387c91 69 led1 = 1;
rubends 3:793425387c91 70 button1_busy=true;
rubends 3:793425387c91 71 clickResetTimeout.attach(callback(&button1_multiclick_reset_cb), 1); //during 1 sec
rubends 3:793425387c91 72 }
jensdehoog 0:fd29cd85e75e 73
rubends 3:793425387c91 74 if(button1_enabled){
rubends 3:793425387c91 75 clicks++;
rubends 3:793425387c91 76 button1_enabled = false;
rubends 3:793425387c91 77 btnEnableTimeout.attach(callback(&button1_enabled_cb), 0.1); //debounce button
rubends 3:793425387c91 78 }
jensdehoog 0:fd29cd85e75e 79 }