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Fork of PGO6_VoteController_template by
debounce_button.cpp
- Committer:
- alex69
- Date:
- 2018-10-11
- Revision:
- 3:abfa79c5b7bd
- Parent:
- 2:5b7d055dbc91
File content as of revision 3:abfa79c5b7bd:
#include "debounce_button.h" /** Some tips and tricks: - To use the built-in LED: DigitalOut led1(LED1); ... led1 = 1; - To delay the call of a function: Timeout someTimeout; ... someTimeout.attach(callback(&someFunction), 0.5) with 0.5 as 500 milliseconds - The variables that are used in interrupt callbacks have to be volatile, because these variables can change at any time. Therefore, the compiler is not going to make optimisations. */ // init the extern variables volatile int multiclick_state = 0; volatile int tempCount = 0; volatile bool button1_busy = false; volatile bool button1_pressed = false; volatile bool button1_enabled = true; DigitalOut myled(LED1); Timeout enableButtonTimer; Timeout resetButtonTimer; void button1_multiclick_reset_cb(void) { //stores the amount of clicks in a variable which is read by the main loop. multiclick_state = tempCount; //resets the click counter which is used inside this file. tempCount = 0; //lowers a flag which tells the main loop that the user stopped pressing the button such that it can proceed its program. button1_busy = false; //turns the built-in LED off. Therefore, the user gets informed that the program stopped counting the clicks. myled = 0; } /** TODO ---- This function enables the button again, such that unwanted clicks of the bouncing button get ignored. */ void button1_enabled_cb(void) { button1_enabled = true; } void button1_onpressed_cb(void) { if(button1_enabled) { //disables the button such that the debouncer is active button1_enabled = false; //enables the button again after a certain amount of time (use interrupts with "button1_enabled_cb()" as callback.) enableButtonTimer.attach(callback(&button1_enabled_cb), 0.1); //informs the main loop that the button has been pressed button1_pressed = true; //informs the main loop that the user is clicking the button. //Therefore, this main loop cannot continue its procedure until the clicks within 1 second have been counted. if(!button1_busy) { //turns the built-in LED on, so the user gets informed that the program has started with counting clicks myled = 1; button1_busy = true; resetButtonTimer.attach(callback(&button1_multiclick_reset_cb), 1); } //counts the amount of clicks within a period of 1 second tempCount++; } }