File content as of revision 2:c90e2d2f52aa:

#include "SlowPWM.h"
 
SlowPWM::SlowPWM(const PinName pin ):DigitalOut(pin)
{
    _repeatTime=1;
    _timeOn=0.5f;
}
 
SlowPWM::SlowPWM( const PinName pin, const float period, const float highTime ):DigitalOut(pin)
{
    setPeriod(period);
    setHighTime(highTime);
    start();
}
 
void SlowPWM::setPeriod(const float period)
{
    _repeatTime = period;
    if (_repeatTime <= 0)   // check it's not 0 or negative
        _repeatTime = 1;
    setHighTime(_timeOn);  // perform sanity check on high time
}
 
void SlowPWM::setHighTime(const float highTime)
{
    _timeOn = highTime;
    if (_timeOn >= _repeatTime)  // check it's not more than the cycle time.
        _timeOn = _repeatTime/2; // set to 50% if invalid 
}
 
void SlowPWM::setDutyCycle(const float cycle) {
        if (cycle == 1) {
          stop();
          write(1);
          } else if (cycle == 0) {
              stop();
              write(0);
        } else if ((cycle >0) && (cycle <1)) {
        _timeOn = _repeatTime*cycle; 
        start();
        } else
        _timeOn = _repeatTime/2; // set to 50% if invalid 
}
 
void SlowPWM::stop()
{
    offTimer.detach();
    cycleTimer.detach();
}
 
// start things.
void SlowPWM::start()
{
    cycleTimer.attach(callback(this,&SlowPWM::onCycleStart),_repeatTime);
    onCycleStart();
}
 
void SlowPWM::onTurnOff(void)
{
    write(0);
}
 
void SlowPWM::onCycleStart(void)
{
    offTimer.attach(callback(this,&SlowPWM::onTurnOff),_timeOn);
    write(1);
}