BlinkLed.cpp

00001 #include "BlinkLed.h"
00002 
00003 BlinkLed::BlinkLed(PinName pin, float dutyChangeStep) :
00004     led(pin),
00005     dutyChangeStep(dutyChangeStep),
00006     pause(true),
00007     thread(0)
00008 {
00009 }
00010 
00011 BlinkLed::~BlinkLed()
00012 {
00013 }
00014 
00015 void BlinkLed::startBlink()
00016 {
00017     pause = false;
00018     if(!thread)
00019     {
00020         thread = new Thread(blink, this, osPriorityNormal, 128, NULL);
00021     }
00022     thread->signal_set(1);
00023 }
00024 
00025 void BlinkLed::finishBlink()
00026 {
00027     pause = true;
00028 }
00029 
00030 bool BlinkLed::isBlinking()
00031 {
00032     return !pause;
00033 }
00034 
00035 void BlinkLed::blink(void const *argument)
00036 {
00037     BlinkLed* self = (BlinkLed*)argument;
00038 
00039     bool sign = false;
00040     while(1)
00041     {
00042         if(self->pause)
00043         {
00044             self->led = 0.0F;
00045             Thread::signal_wait(1);
00046         }
00047         float brightness = self->led;
00048         sign = (brightness <= 0.0F) ? true : (1.0F <= brightness) ? false : sign;
00049         self->led = sign ? brightness + self->dutyChangeStep : brightness - self->dutyChangeStep;
00050         Thread::wait(20);
00051     }
00052 }