Emery Premeaux / Mbed 2 deprecated Examples

A collection of examples organized from basics to advanced.

Dependencies:   mbed SDFileSystem

Mbed online compiler has no facility to easily manage a lot of programs or organized them in to related folders. This makes creating an examples and sample pack difficult.

This repository contains a single main.cpp file (which does very little), and a BuildOptions.h file. Simply uncomment the example you would like to compile from the build options. Each example is wrapped in a compiler directive.

If the directive does not include a description comment, it likely does not exist yet. If you would like to contribute to the Examples project, please contact me or fork and issue a pull request.

02_Digital/Debounce.cpp@1:9a043ee174de, 2019-07-05 (annotated)

Committer:
epremeaux
Date:
Fri Jul 05 04:52:18 2019 +0000
Revision:
1:9a043ee174de
cleaning up and organizing directories. added a few programs

Who changed what in which revision?

UserRevisionLine numberNew contents of line
epremeaux 1:9a043ee174de 1 #ifdef COMPILE_Debounce
epremeaux 1:9a043ee174de 2
epremeaux 1:9a043ee174de 3 DigitalOut led1(LED1);
epremeaux 1:9a043ee174de 4
epremeaux 1:9a043ee174de 5 InterruptIn button1(USER_BUTTON);
epremeaux 1:9a043ee174de 6 volatile bool button1_pressed = false; // Used in the main loop
epremeaux 1:9a043ee174de 7 volatile bool button1_enabled = true; // Used for debouncing
epremeaux 1:9a043ee174de 8 Timeout button1_timeout; // Used for debouncing
epremeaux 1:9a043ee174de 9
epremeaux 1:9a043ee174de 10 // Enables button when bouncing is over
epremeaux 1:9a043ee174de 11 void button1_enabled_cb(void)
epremeaux 1:9a043ee174de 12 {
epremeaux 1:9a043ee174de 13 button1_enabled = true;
epremeaux 1:9a043ee174de 14 }
epremeaux 1:9a043ee174de 15
epremeaux 1:9a043ee174de 16 // ISR handling button pressed event
epremeaux 1:9a043ee174de 17 void button1_onpressed_cb(void)
epremeaux 1:9a043ee174de 18 {
epremeaux 1:9a043ee174de 19 if (button1_enabled) { // Disabled while the button is bouncing
epremeaux 1:9a043ee174de 20 button1_enabled = false;
epremeaux 1:9a043ee174de 21 button1_pressed = true; // To be read by the main loop
epremeaux 1:9a043ee174de 22 button1_timeout.attach(callback(button1_enabled_cb), 0.3); // Debounce time 300 ms
epremeaux 1:9a043ee174de 23 }
epremeaux 1:9a043ee174de 24 }
epremeaux 1:9a043ee174de 25
epremeaux 1:9a043ee174de 26 int main()
epremeaux 1:9a043ee174de 27 {
epremeaux 1:9a043ee174de 28 //button1.mode(PullUp); // Activate pull-up
epremeaux 1:9a043ee174de 29 button1.fall(callback(button1_onpressed_cb)); // Attach ISR to handle button press event
epremeaux 1:9a043ee174de 30
epremeaux 1:9a043ee174de 31 int idx = 0; // Just for printf below
epremeaux 1:9a043ee174de 32
epremeaux 1:9a043ee174de 33 while(1) {
epremeaux 1:9a043ee174de 34 if (button1_pressed) { // Set when button is pressed
epremeaux 1:9a043ee174de 35 button1_pressed = false;
epremeaux 1:9a043ee174de 36 printf("Button pressed %d\n", idx++);
epremeaux 1:9a043ee174de 37 led1 = !led1;
epremeaux 1:9a043ee174de 38 }
epremeaux 1:9a043ee174de 39 }
epremeaux 1:9a043ee174de 40 }
epremeaux 1:9a043ee174de 41
epremeaux 1:9a043ee174de 42 #endif