University of Plymouth - Stages 1, 2 and 3 / Mbed OS Task651-mbedos-FZ429ZI-eventqueue_CPP

Using event queues with C++

Dependencies:   ELEC350-Practicals-FZ429

Fork of Task622Solution-mbedos54 by Nicholas Outram

main.cpp@11:c865ef615016, 2017-11-23 (annotated)

Committer:
noutram
Date:
Thu Nov 23 14:15:38 2017 +0000
Revision:
11:c865ef615016
Parent:
10:c077eefcf371 
Uses C++

Who changed what in which revision?

UserRevisionLine numberNew contents of line
noutram 0:f916cefba2f4 1 #include "mbed.h"
noutram 10:c077eefcf371 2 #include <iostream>
noutram 10:c077eefcf371 3 #include "sample_hardware.hpp"
noutram 10:c077eefcf371 4 #include "mbed_events.h"
noutram 10:c077eefcf371 5 void do_rising();
noutram 10:c077eefcf371 6 void enableRising();
noutram 10:c077eefcf371 7
noutram 10:c077eefcf371 8 DigitalOut led(LED1);
noutram 10:c077eefcf371 9 InterruptIn btn(USER_BUTTON);
noutram 0:f916cefba2f4 10
noutram 10:c077eefcf371 11 class ButtonManager {
noutram 10:c077eefcf371 12 private:
noutram 10:c077eefcf371 13 InterruptIn& input;
noutram 10:c077eefcf371 14 EventQueue& q;
noutram 10:c077eefcf371 15 unsigned int count;
noutram 10:c077eefcf371 16 unsigned int state;
noutram 0:f916cefba2f4 17
noutram 10:c077eefcf371 18 void risingEdgeISR() {
noutram 10:c077eefcf371 19 if (state == 0) {
noutram 10:c077eefcf371 20 input.rise(NULL);
noutram 10:c077eefcf371 21 led = !led;
noutram 10:c077eefcf371 22 state = 1;
noutram 10:c077eefcf371 23 q.call_in(200, callback(this, &ButtonManager::risingEdgeHasSettled));
noutram 10:c077eefcf371 24 q.call(printf, "Pressed %d times\n", ++count);
noutram 10:c077eefcf371 25 }
noutram 10:c077eefcf371 26 }
noutram 10:c077eefcf371 27
noutram 10:c077eefcf371 28 void risingEdgeHasSettled() {
noutram 10:c077eefcf371 29 state = 2;
noutram 10:c077eefcf371 30 input.fall(callback(this, &ButtonManager::fallingEdgeISR));
noutram 10:c077eefcf371 31 printf("Rising edge has settled\n");
noutram 10:c077eefcf371 32 }
noutram 10:c077eefcf371 33
noutram 10:c077eefcf371 34 void fallingEdgeISR() {
noutram 10:c077eefcf371 35 if (state == 2) {
noutram 10:c077eefcf371 36 input.fall(NULL);
noutram 10:c077eefcf371 37 state = 3;
noutram 10:c077eefcf371 38 q.call_in(200, callback(this, &ButtonManager::fallingEdgeHasSettled));
noutram 10:c077eefcf371 39 q.call(printf, "Falling edge detected\n");
noutram 10:c077eefcf371 40 }
noutram 10:c077eefcf371 41 }
noutram 10:c077eefcf371 42
noutram 10:c077eefcf371 43 void fallingEdgeHasSettled() {
noutram 10:c077eefcf371 44 state = 0;
noutram 10:c077eefcf371 45 input.rise(callback(this, &ButtonManager::risingEdgeISR));
noutram 10:c077eefcf371 46 printf("Falling edge has settled\n");
noutram 10:c077eefcf371 47 }
noutram 10:c077eefcf371 48
noutram 10:c077eefcf371 49 public:
noutram 10:c077eefcf371 50
noutram 10:c077eefcf371 51 ButtonManager(InterruptIn& ip, EventQueue& queue) : input(ip), q(queue) {
noutram 10:c077eefcf371 52 count=0;
noutram 10:c077eefcf371 53 state=0;
noutram 10:c077eefcf371 54 input.rise(callback(this, &ButtonManager::risingEdgeISR));
noutram 10:c077eefcf371 55 printf("Initialised\n");
noutram 10:c077eefcf371 56 }
noutram 10:c077eefcf371 57
noutram 10:c077eefcf371 58 };
noutram 8:b28defacd894 59
noutram 10:c077eefcf371 60
noutram 10:c077eefcf371 61 int main() {
noutram 10:c077eefcf371 62 //Creates a queue with the default size
noutram 10:c077eefcf371 63 EventQueue queue;
noutram 10:c077eefcf371 64
noutram 10:c077eefcf371 65 //Map button state machine onto the main queue
noutram 10:c077eefcf371 66 ButtonManager bm(btn, queue);
noutram 2:70084af839d3 67
noutram 10:c077eefcf371 68 // events are executed by the dispatch method
noutram 10:c077eefcf371 69 queue.dispatch();
noutram 10:c077eefcf371 70
noutram 10:c077eefcf371 71 //Unreachable code
noutram 10:c077eefcf371 72 printf("This should never appear!\n");
noutram 0:f916cefba2f4 73 }
noutram 0:f916cefba2f4 74
noutram 4:dae8898e55fe 75