Aleksander Chernyavskiy / Mbed OS pgo6_aleksander_chernyavskiy

opdracht mqtt nucleo

Dependencies:   MQTT

Fork of PGO6_VoteController_template by Jens de hoog

debounce_button.cpp@3:abfa79c5b7bd, 2018-10-11 (annotated)

Committer:
alex69
Date:
Thu Oct 11 15:52:51 2018 +0000
Revision:
3:abfa79c5b7bd
Parent:
2:5b7d055dbc91 
Initial commit

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
alex69 3:abfa79c5b7bd 18
alex69 3:abfa79c5b7bd 19 // init the extern variables
alex69 3:abfa79c5b7bd 20 volatile int multiclick_state = 0;
alex69 3:abfa79c5b7bd 21 volatile int tempCount = 0;
alex69 3:abfa79c5b7bd 22 volatile bool button1_busy = false;
alex69 3:abfa79c5b7bd 23 volatile bool button1_pressed = false;
alex69 3:abfa79c5b7bd 24 volatile bool button1_enabled = true;
alex69 3:abfa79c5b7bd 25 DigitalOut myled(LED1);
alex69 3:abfa79c5b7bd 26 Timeout enableButtonTimer;
alex69 3:abfa79c5b7bd 27 Timeout resetButtonTimer;
alex69 3:abfa79c5b7bd 28
jensdehoog 2:5b7d055dbc91 29 void button1_multiclick_reset_cb(void) {
alex69 3:abfa79c5b7bd 30 //stores the amount of clicks in a variable which is read by the main loop.
alex69 3:abfa79c5b7bd 31 multiclick_state = tempCount;
alex69 3:abfa79c5b7bd 32 //resets the click counter which is used inside this file.
alex69 3:abfa79c5b7bd 33 tempCount = 0;
alex69 3:abfa79c5b7bd 34 //lowers a flag which tells the main loop that the user stopped pressing the button such that it can proceed its program.
alex69 3:abfa79c5b7bd 35 button1_busy = false;
alex69 3:abfa79c5b7bd 36 //turns the built-in LED off. Therefore, the user gets informed that the program stopped counting the clicks.
alex69 3:abfa79c5b7bd 37 myled = 0;
jensdehoog 2:5b7d055dbc91 38
jensdehoog 2:5b7d055dbc91 39 }
jensdehoog 2:5b7d055dbc91 40
jensdehoog 2:5b7d055dbc91 41 /**
jensdehoog 2:5b7d055dbc91 42 TODO
jensdehoog 2:5b7d055dbc91 43 ----
jensdehoog 2:5b7d055dbc91 44 This function enables the button again, such that unwanted clicks of the bouncing button get ignored.
jensdehoog 0:fd29cd85e75e 45 */
jensdehoog 2:5b7d055dbc91 46 void button1_enabled_cb(void)
jensdehoog 2:5b7d055dbc91 47 {
alex69 3:abfa79c5b7bd 48 button1_enabled = true;
jensdehoog 2:5b7d055dbc91 49 }
jensdehoog 0:fd29cd85e75e 50
jensdehoog 0:fd29cd85e75e 51 void button1_onpressed_cb(void)
jensdehoog 0:fd29cd85e75e 52 {
alex69 3:abfa79c5b7bd 53 if(button1_enabled) {
alex69 3:abfa79c5b7bd 54 //disables the button such that the debouncer is active
alex69 3:abfa79c5b7bd 55 button1_enabled = false;
alex69 3:abfa79c5b7bd 56 //enables the button again after a certain amount of time (use interrupts with "button1_enabled_cb()" as callback.)
alex69 3:abfa79c5b7bd 57 enableButtonTimer.attach(callback(&button1_enabled_cb), 0.1);
alex69 3:abfa79c5b7bd 58 //informs the main loop that the button has been pressed
alex69 3:abfa79c5b7bd 59 button1_pressed = true;
alex69 3:abfa79c5b7bd 60 //informs the main loop that the user is clicking the button.
alex69 3:abfa79c5b7bd 61 //Therefore, this main loop cannot continue its procedure until the clicks within 1 second have been counted.
alex69 3:abfa79c5b7bd 62 if(!button1_busy) {
alex69 3:abfa79c5b7bd 63 //turns the built-in LED on, so the user gets informed that the program has started with counting clicks
alex69 3:abfa79c5b7bd 64 myled = 1;
alex69 3:abfa79c5b7bd 65 button1_busy = true;
alex69 3:abfa79c5b7bd 66 resetButtonTimer.attach(callback(&button1_multiclick_reset_cb), 1);
alex69 3:abfa79c5b7bd 67 }
alex69 3:abfa79c5b7bd 68 //counts the amount of clicks within a period of 1 second
alex69 3:abfa79c5b7bd 69 tempCount++;
alex69 3:abfa79c5b7bd 70
alex69 3:abfa79c5b7bd 71 }
jensdehoog 0:fd29cd85e75e 72 }