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

Task651 Event Queue

Dependencies:   ELEC350-Practicals-FZ429

Fork of Task622Solution-mbedos54 by Nicholas Outram

main.cpp@11:f8dde59c750c, 2017-11-23 (annotated)

Committer:
noutram
Date:
Thu Nov 23 14:15:12 2017 +0000
Revision:
11:f8dde59c750c
Parent:
10:dd9aa289d656 
EventQueue using C Functions

Who changed what in which revision?

UserRevisionLine numberNew contents of line
noutram 0:f916cefba2f4 1 #include "mbed.h"
noutram 10:dd9aa289d656 2 #include <iostream>
noutram 10:dd9aa289d656 3 #include "sample_hardware.hpp"
noutram 10:dd9aa289d656 4 #include "mbed_events.h"
noutram 10:dd9aa289d656 5 void do_rising();
noutram 10:dd9aa289d656 6 void enableRising();
noutram 10:dd9aa289d656 7
noutram 10:dd9aa289d656 8 DigitalOut led(LED1);
noutram 10:dd9aa289d656 9 InterruptIn btn(USER_BUTTON);
noutram 8:b28defacd894 10
noutram 10:dd9aa289d656 11 // creates a queue with the default size
noutram 10:dd9aa289d656 12 EventQueue queue;
noutram 10:dd9aa289d656 13 unsigned int buttonCount = 0;
noutram 0:f916cefba2f4 14
noutram 10:dd9aa289d656 15
noutram 10:dd9aa289d656 16 int main() {
noutram 10:dd9aa289d656 17
noutram 10:dd9aa289d656 18 //Hook up isr
noutram 10:dd9aa289d656 19 enableRising();
noutram 8:b28defacd894 20
noutram 10:dd9aa289d656 21 // events are simple callbacks
noutram 10:dd9aa289d656 22 queue.call(printf, "called immediately on dispatch\n");
noutram 10:dd9aa289d656 23 queue.call_in(2000, printf, "called after 2 seconds\n");
noutram 10:dd9aa289d656 24 queue.call_every(1000, printf, "called every 1 seconds\n");
noutram 0:f916cefba2f4 25
noutram 10:dd9aa289d656 26 // events are executed by the dispatch method
noutram 10:dd9aa289d656 27 queue.dispatch();
noutram 10:dd9aa289d656 28
noutram 10:dd9aa289d656 29 //Unreachable code
noutram 10:dd9aa289d656 30 printf("This should never appear!\n");
noutram 8:b28defacd894 31 }
noutram 8:b28defacd894 32
noutram 10:dd9aa289d656 33 //ISR
noutram 10:dd9aa289d656 34 void do_rising() {
noutram 10:dd9aa289d656 35 //ISR response time (fast)
noutram 10:dd9aa289d656 36 led = !led;
noutram 10:dd9aa289d656 37
noutram 10:dd9aa289d656 38 //Turn off this interrupt (fast)
noutram 10:dd9aa289d656 39 btn.rise(NULL);
noutram 2:70084af839d3 40
noutram 10:dd9aa289d656 41 //Post the following into the main thread event queue
noutram 10:dd9aa289d656 42
noutram 10:dd9aa289d656 43 //Turn back on after a delay
noutram 10:dd9aa289d656 44 queue.call_in(1000, enableRising);
noutram 10:dd9aa289d656 45
noutram 10:dd9aa289d656 46 //Dispatch to the main thread queue
noutram 10:dd9aa289d656 47 queue.call(printf, "Button depressed %5d times\n", ++buttonCount);
noutram 0:f916cefba2f4 48 }
noutram 0:f916cefba2f4 49
noutram 10:dd9aa289d656 50 //Enable the rising edge
noutram 10:dd9aa289d656 51 void enableRising() {
noutram 10:dd9aa289d656 52 btn.rise(do_rising);
noutram 0:f916cefba2f4 53 }