SwitchManager.hpp

00001 #include "mbed.h"
00002  
00003 //This class manages an Interrupt in and LED output
00004 //It automatically manages the switch-debounce using edge detection and timers
00005 class SwitchManager {
00006 private:
00007 // enum State {LOW, LOW_DEBOUNCE, HIGH, HIGH_DEBOUNCE};  
00008     InterruptIn& switchInterrupt;
00009     DigitalOut& led;
00010     Timeout t;
00011     
00012     void waitForRising() {
00013         //Turn off interrupt
00014         switchInterrupt.rise(NULL);
00015         //Turn on timer
00016         t.attach(callback(this, &SwitchManager::waitForStabilityRising), 0.2);
00017     }
00018     
00019     void waitForStabilityRising() {
00020         //Look for falling edge
00021         switchInterrupt.fall(callback(this, &SwitchManager::waitForFalling));
00022     }
00023     
00024     void waitForFalling() {
00025         led = !led;
00026         switchInterrupt.fall(NULL);
00027         t.attach(callback(this, &SwitchManager::waitForStabilityFalling), 0.2);
00028     }
00029     
00030     void waitForStabilityFalling() {
00031         //Look for rising edge
00032         switchInterrupt.rise(callback(this, &SwitchManager::waitForRising));
00033     }
00034     
00035 public:
00036     SwitchManager(InterruptIn& intIn, DigitalOut& gpio) : switchInterrupt(intIn), led(gpio) {
00037         //Listen for rising edge
00038         switchInterrupt.rise(callback(this, &SwitchManager::waitForRising));
00039     }
00040     ~SwitchManager() {
00041         //Turn off LED and shut off any ISRs
00042         led = 0;
00043         switchInterrupt.rise(NULL);
00044         switchInterrupt.fall(NULL);
00045         t.detach();
00046     }
00047 };