85 lines
2.1 KiB
Go
85 lines
2.1 KiB
Go
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package main
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import "math"
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// daemonState contains all the state of the daemon. A copy of it can be
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// requested for consumers, eg. the web view.
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type daemonState struct {
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safety safetyStatus
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// adcPiraniVolts is a moving window of read ADC values, used to calculate a
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// moving average.
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adcPiraniVolts []float32
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rpOn bool
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dpOn bool
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vent momentaryOutput
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pumpdown momentaryOutput
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aboveRough thresholdOutput
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aboveHigh thresholdOutput
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}
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type safetyStatus struct {
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// failsafe mode is enabled when the pirani gauge appears to be
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// disconnected, and is disabled only when an atmosphere is read.
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failsafe bool
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// highPressure mode is enabled when the pressure reading is above 1e-1
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// mbar, locking out the diffusion pump from being enabled.
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highPressure bool
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}
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type piraniDetection uint
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const (
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// piraniDetectionUnknown means the system isn't yet sure whether the pirani
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// gauge is connected.
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piraniDetectionUnknown piraniDetection = iota
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// piraniDetectionConnected means the system assumes the pirani gauge is
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// connected.
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piraniDetectionConnected = iota
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// piraniDetectionDisconnected means the system assumes the pirani gauge is
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// disconnected.
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piraniDetectionDisconnected = iota
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)
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// piraniDetection guesses whether the pirani gauge is connected.
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func (d *daemonState) piraniDetection() piraniDetection {
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if len(d.adcPiraniVolts) < 3 {
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return piraniDetectionUnknown
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}
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volts := float32(0.0)
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for _, v := range d.adcPiraniVolts[len(d.adcPiraniVolts)-3:] {
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volts += v
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}
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volts /= 3.0
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bar := math.Pow(10.0, float64(volts)-8.5)
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mbar := float32(bar * 1000.0)
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if mbar < 4e-6 {
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return piraniDetectionDisconnected
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}
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return piraniDetectionConnected
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}
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func (d *daemonState) pirani() (volts float32, mbar float32) {
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volts = 0.0
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for _, v := range d.adcPiraniVolts {
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volts += v
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}
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if len(d.adcPiraniVolts) != 0 {
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volts /= float32(len(d.adcPiraniVolts))
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}
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// Per Pirani probe docs.
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bar := math.Pow(10.0, float64(volts)-8.5)
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mbar = float32(bar * 1000.0)
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return
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}
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func (d *daemonState) vacuumStatus() (rough, high bool) {
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rough = !d.aboveRough.output
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high = !d.aboveHigh.output
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return
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}
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