inline void GrillPid::commitFanOutput(void)
{
/* Long PWM period is 10 sec */
const unsigned int LONG_PWM_PERIOD = 10000;
const unsigned int PERIOD_SCALE = (LONG_PWM_PERIOD / TEMP_MEASURE_PERIOD);
unsigned char fanSpeed = getFanSpeed();
/* For anything above _minFanSpeed, do a nomal PWM write.
For below _minFanSpeed we use a "long pulse PWM", where
the pulse is 10 seconds in length. For each percent we are
emulating, run the fan for one interval. */
if (fanSpeed >= _minFanSpeed)
_longPwmTmr = 0;
else
{
// Simple PWM, ON for first [FanSpeed] intervals then OFF
// for the remainder of the period
if (((PERIOD_SCALE * fanSpeed / _minFanSpeed) > _longPwmTmr))
fanSpeed = _minFanSpeed;
else
fanSpeed = 0;
if (++_longPwmTmr > (PERIOD_SCALE - 1))
_longPwmTmr = 0;
} /* long PWM */
if (bit_is_set(_outputFlags, PIDFLAG_INVERT_FAN))
fanSpeed = _maxFanSpeed - fanSpeed;
analogWrite(_fanPin, mappct(fanSpeed, 0, 255));
}
inline void GrillPid::commitServoOutput(void)
{
#if defined(GRILLPID_SERVO_ENABLED)
unsigned char output;
if (bit_is_set(_outputFlags, PIDFLAG_SERVO_ANY_MAX) && _pidOutput > 0)
output = 100;
else
output = _pidOutput;
if (bit_is_set(_outputFlags, PIDFLAG_INVERT_SERVO))
output = 100 - output;
// Get the output speed in 10x usec by LERPing between min and max
output = mappct(output, _minServoPos, _maxServoPos);
// Servo output is actually set on the next interrupt cycle
_servoOutput = uSecToTicks(10U * output);
#endif
}
inline void GrillPid::commitFanOutput(void)
{
/* Long PWM period is 10 sec */
const unsigned int LONG_PWM_PERIOD = 10000;
const unsigned int PERIOD_SCALE = (LONG_PWM_PERIOD / TEMP_MEASURE_PERIOD);
unsigned char fanSpeed = getFanSpeed();
/* For anything above _minFanSpeed, do a nomal PWM write.
For below _minFanSpeed we use a "long pulse PWM", where
the pulse is 10 seconds in length. For each percent we are
emulating, run the fan for one interval. */
if (fanSpeed >= _minFanSpeed)
_longPwmTmr = 0;
else
{
// Simple PWM, ON for first [FanSpeed] intervals then OFF
// for the remainder of the period
if (((PERIOD_SCALE * fanSpeed / _minFanSpeed) > _longPwmTmr))
fanSpeed = _minFanSpeed;
else
fanSpeed = 0;
if (++_longPwmTmr > (PERIOD_SCALE - 1))
_longPwmTmr = 0;
} /* long PWM */
if (bit_is_set(_outputFlags, PIDFLAG_INVERT_FAN))
fanSpeed = _maxFanSpeed - fanSpeed;
unsigned char newBlowerOutput = mappct(fanSpeed, 0, 255);
analogWrite(_fanPin, newBlowerOutput);
#if defined(GRILLPID_FAN_BOOST_ENABLED)
// If going from 0% to non-0%, turn the blower fully on for one period
// to get it moving
if (_lastBlowerOutput == 0 && newBlowerOutput != 0)
{
digitalWrite(_fanPin, HIGH);
_fanBoostActive = true;
}
_lastBlowerOutput = newBlowerOutput;
#endif
}
