University of Plymouth - Stages 1, 2 and 3 / Mbed OS Task330_ISR

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Fork of Task330_ISR by University of Plymouth - Stages 1, 2 and 3

SwitchManager.hpp@0:2a35dbda8863, 2017-10-23 (annotated)

Committer:
noutram
Date:
Mon Oct 23 13:41:17 2017 +0000
Revision:
0:2a35dbda8863
Solution using ISR and Timeout

Who changed what in which revision?

UserRevisionLine numberNew contents of line
noutram 0:2a35dbda8863 1 #include "mbed.h"
noutram 0:2a35dbda8863 2
noutram 0:2a35dbda8863 3 //This class manages an Interrupt in and LED output
noutram 0:2a35dbda8863 4 //It automatically manages the switch-debounce using edge detection and timers
noutram 0:2a35dbda8863 5 class SwitchManager {
noutram 0:2a35dbda8863 6 private:
noutram 0:2a35dbda8863 7 // enum State {LOW, LOW_DEBOUNCE, HIGH, HIGH_DEBOUNCE};
noutram 0:2a35dbda8863 8 InterruptIn& switchInterrupt;
noutram 0:2a35dbda8863 9 DigitalOut& led;
noutram 0:2a35dbda8863 10 Timeout t;
noutram 0:2a35dbda8863 11
noutram 0:2a35dbda8863 12 void waitForRising() {
noutram 0:2a35dbda8863 13 //Turn off interrupt
noutram 0:2a35dbda8863 14 switchInterrupt.rise(NULL);
noutram 0:2a35dbda8863 15 //Turn on timer
noutram 0:2a35dbda8863 16 t.attach(callback(this, &SwitchManager::waitForStabilityRising), 0.2);
noutram 0:2a35dbda8863 17 }
noutram 0:2a35dbda8863 18
noutram 0:2a35dbda8863 19 void waitForStabilityRising() {
noutram 0:2a35dbda8863 20 //Look for falling edge
noutram 0:2a35dbda8863 21 switchInterrupt.fall(callback(this, &SwitchManager::waitForFalling));
noutram 0:2a35dbda8863 22 }
noutram 0:2a35dbda8863 23
noutram 0:2a35dbda8863 24 void waitForFalling() {
noutram 0:2a35dbda8863 25 led = !led;
noutram 0:2a35dbda8863 26 switchInterrupt.fall(NULL);
noutram 0:2a35dbda8863 27 t.attach(callback(this, &SwitchManager::waitForStabilityFalling), 0.2);
noutram 0:2a35dbda8863 28 }
noutram 0:2a35dbda8863 29
noutram 0:2a35dbda8863 30 void waitForStabilityFalling() {
noutram 0:2a35dbda8863 31 //Look for rising edge
noutram 0:2a35dbda8863 32 switchInterrupt.rise(callback(this, &SwitchManager::waitForRising));
noutram 0:2a35dbda8863 33 }
noutram 0:2a35dbda8863 34
noutram 0:2a35dbda8863 35 public:
noutram 0:2a35dbda8863 36 SwitchManager(InterruptIn& intIn, DigitalOut& gpio) : switchInterrupt(intIn), led(gpio) {
noutram 0:2a35dbda8863 37 //Listen for rising edge
noutram 0:2a35dbda8863 38 switchInterrupt.rise(callback(this, &SwitchManager::waitForRising));
noutram 0:2a35dbda8863 39 }
noutram 0:2a35dbda8863 40 ~SwitchManager() {
noutram 0:2a35dbda8863 41 //Turn off LED and shut off any ISRs
noutram 0:2a35dbda8863 42 led = 0;
noutram 0:2a35dbda8863 43 switchInterrupt.rise(NULL);
noutram 0:2a35dbda8863 44 switchInterrupt.fall(NULL);
noutram 0:2a35dbda8863 45 t.detach();
noutram 0:2a35dbda8863 46 }
noutram 0:2a35dbda8863 47 };