Niels Balemans / Mbed OS PGO6_VoteController_Niels_Balemans_

vote controller

Dependencies:   MQTT

Fork of PGO6_VoteController_template by Jens de hoog

debounce_button.cpp@1:34e76c0cbe5a, 2017-10-29 (annotated)

Committer:
jensdehoog
Date:
Sun Oct 29 23:01:06 2017 +0000
Revision:
1:34e76c0cbe5a
Parent:
0:fd29cd85e75e
Child:
2:5b7d055dbc91
Updated the assignment for a longer during time

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 1:34e76c0cbe5a 4 TODO
jensdehoog 1:34e76c0cbe5a 5 ----
jensdehoog 1:34e76c0cbe5a 6 - A debouncer has to be present: the built-in buttons of the Nucleo aren't that good, so false positives have to be filtered out.
jensdehoog 1:34e76c0cbe5a 7 Find a method such that false calls of this function are going to be filtered out.
jensdehoog 1:34e76c0cbe5a 8 The main loop also needs to know when it can process the further instructions.
jensdehoog 1:34e76c0cbe5a 9 An acceptable time to disable further false positives is between 50ms and 100ms.
jensdehoog 1:34e76c0cbe5a 10 - The user needs to be able to click the button multiple times in 1 second.
jensdehoog 1:34e76c0cbe5a 11 The main loop needs to know how many times the user has pressed the button, such that
jensdehoog 1:34e76c0cbe5a 12 it can link different procedures to the different multiclicks. The main loop also needs
jensdehoog 1:34e76c0cbe5a 13 to know when this function is counting the clicks. Therefore, it has to wait until the clicks have been counted
jensdehoog 1:34e76c0cbe5a 14 before it can proceed.
jensdehoog 1:34e76c0cbe5a 15 - LED1 needs to be turned on while the function is counting the amount of clicks within 1 second.
jensdehoog 1:34e76c0cbe5a 16
jensdehoog 0:fd29cd85e75e 17 Some tips and tricks:
jensdehoog 0:fd29cd85e75e 18 - To use the built-in LED:
jensdehoog 0:fd29cd85e75e 19 DigitalOut led1(LED1);
jensdehoog 0:fd29cd85e75e 20 ...
jensdehoog 0:fd29cd85e75e 21 led1 = 1;
jensdehoog 0:fd29cd85e75e 22 - To delay the call of a function:
jensdehoog 0:fd29cd85e75e 23 Timeout someTimeout;
jensdehoog 0:fd29cd85e75e 24 ...
jensdehoog 1:34e76c0cbe5a 25 someTimeout.attach(callback(&anotherFunction), 0.5) with 0.5 as 500 milliseconds
jensdehoog 0:fd29cd85e75e 26 - The variables that are used in interrupt callbacks have to be volatile,
jensdehoog 0:fd29cd85e75e 27 because these variables can change at any time. Therefore, the compiler is not
jensdehoog 0:fd29cd85e75e 28 going to make optimisations.
jensdehoog 1:34e76c0cbe5a 29 - Use boolean flags to send information between different processes.
jensdehoog 1:34e76c0cbe5a 30 - In the header file are extra functions and variables that can help you developing these procedures.
jensdehoog 1:34e76c0cbe5a 31 You can add, change or remove these functions and variables at any time, as long as it is clear what you've done.
jensdehoog 0:fd29cd85e75e 32 */
jensdehoog 0:fd29cd85e75e 33
jensdehoog 0:fd29cd85e75e 34 /**
jensdehoog 1:34e76c0cbe5a 35 This function is called when the button has been pressed by the user.
jensdehoog 0:fd29cd85e75e 36 */
jensdehoog 0:fd29cd85e75e 37
jensdehoog 0:fd29cd85e75e 38 void button1_onpressed_cb(void)
jensdehoog 0:fd29cd85e75e 39 {
jensdehoog 0:fd29cd85e75e 40
jensdehoog 0:fd29cd85e75e 41 }