fatih kilic
/
PGO6_VoteController_template
last version
debounce_button.cpp
- Committer:
- fatihkilic
- Date:
- 2019-11-22
- Revision:
- 3:e75fe1b54623
- Parent:
- 2:5b7d055dbc91
File content as of revision 3:e75fe1b54623:
#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. */ /** TODO ---- This function: - stores the amount of clicks in a variable which is read by the main loop. - resets the click counter which is used inside this file. - lowers a flag which tells the main loop that the user stopped pressing the button such that it can proceed its program. - turns the built-in LED off. Therefore, the user gets informed that the program stopped counting the clicks. */ InterruptIn button(USER_BUTTON); DigitalOut led1(LED1); DigitalIn enable(USER_BUTTON); volatile bool button1_pressed = false; volatile bool button1_enabled = false; volatile int multiclick_state= 0; volatile bool button1_busy = false; volatile int total = 0; Timeout timeout; void button1_multiclick_reset_cb(void) { total = multiclick_state; multiclick_state = 0; led1 = 0; button1_pressed = false; button1_busy = false; button1_enabled_cb(); } /** TODO ---- This function enables the button again, such that unwanted clicks of the bouncing button get ignored. */ void button1_enabled_cb(void) { // button.rise(callback(button1_onpressed_cb)); button1_enabled = true; } /** TODO ---- This function: - turns the built-in LED on, so the user gets informed that the program has started with counting clicks - disables the button such that the debouncer is active - enables the button again after a certain amount of time (use interrupts with "button1_enabled_cb()" as callback. - counts the amount of clicks within a period of 1 second - informs the main loop that the button has been pressed - 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. */ void button1_onpressed_cb(void) { if(button1_enabled && enable){ led1 = 1; button1_pressed = true; button1_enabled = false; button1_busy = true; timeout.attach(callback(&button1_multiclick_reset_cb),1); } if(enable && button1_pressed){ button1_pressed = false; multiclick_state++; } if(!enable){ button1_pressed = true; } } void button1_onrelease_cb(void){ button1_pressed = false; }