FanCurve Namespace Reference

Fan characterization table and interpolation helpers. More...

Functions
size_t	pointCount ()
	Returns the number of measured fan-curve points.
const FanCurvePoint *	points ()
	Returns the measured fan-curve table.
uint16_t	expectedRpmForPwm (uint8_t pwmPercent)
	Interpolates the expected RPM for a PWM command.
uint16_t	rpmToleranceForExpected (uint16_t expectedRpm)
	Calculates the tolerated RPM deviation for an expected speed.
bool	isPlausibilityRegion (uint8_t pwmPercent)
	Checks whether a PWM command is high enough for RPM plausibility checks.

Variables
constexpr uint8_t	kStartPwmPercent = 12
	PWM where the fan reliably starts.
constexpr uint8_t	kMinimumHoldPwmPercent = 10
	Lowest PWM used after the fan is spinning.
constexpr uint8_t	kMinimumPlausibilityPwmPercent = 18
	Minimum PWM where RPM plausibility is checked.
constexpr uint8_t	kPlausibilityTolerancePercent = 12
	RPM tolerance around the expected curve.

Detailed Description

Fan characterization table and interpolation helpers.

The namespace exposes read-only access to measured curve points and helper functions for converting PWM commands into expected RPM and allowed tolerance.

Function Documentation

expectedRpmForPwm()

uint16_t FanCurve::expectedRpmForPwm

(

uint8_t

pwmPercent

)

Interpolates the expected RPM for a PWM command.

Values between measured points are linearly interpolated and rounded to the nearest integer RPM. Values outside the curve range are clamped to the nearest measured endpoint.

Parameters

pwmPercent

Fan PWM command in percent.

Returns

Expected fan speed in RPM.

isPlausibilityRegion()

bool FanCurve::isPlausibilityRegion

(

uint8_t

pwmPercent

)

Checks whether a PWM command is high enough for RPM plausibility checks.

Parameters

pwmPercent

Fan PWM command in percent.

Returns

True when RPM plausibility should be evaluated.

pointCount()

size_t FanCurve::pointCount

(

)

Returns the number of measured fan-curve points.

Returns

Number of entries available from points().

points()

const FanCurvePoint * FanCurve::points

(

)

Returns the measured fan-curve table.

Returns

Pointer to the first measured curve point.

rpmToleranceForExpected()

uint16_t FanCurve::rpmToleranceForExpected

(

uint16_t

expectedRpm

)

Calculates the tolerated RPM deviation for an expected speed.

Parameters

expectedRpm

Expected fan speed in RPM.

Returns

Absolute RPM tolerance.