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succd: calcuate change rate for safety interlock directly from adc ringbuffer

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This commit is contained in:
zdmx 2024-09-27 23:01:17 +02:00
parent d3391b28ec
commit 9ad6ce7dad
3 changed files with 20 additions and 40 deletions
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25
succbone/succd/process.go
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@ -17,8 +17,6 @@ type daemon struct {
// Pirani gauge.
adcPirani adc
lastPressures ringbuffer
failsafe bool
highPressure bool
@ -125,10 +123,8 @@ func (d *daemon) processOnce(_ context.Context) error {
d.aboveRough.process(float64(mbar))
d.aboveHigh.process(float64(mbar))
d.lastPressures.AddValue(mbar)
// max rate of 1.0 in 500 ms because ringbuffer holds 5 values
if d.lastPressures.MaxMinDiff() > 1.0 {
if d.piraniRateOfChange() > 2.0 {
if !d.failsafe {
d.failsafe = true
klog.Errorf("Pressure changed too fast; entering failsafe mode")
@ -199,6 +195,25 @@ func (d *daemon) processOnce(_ context.Context) error {
return nil
}
func (d *daemon) piraniRateOfChange() float32 {
max := d.adcPiraniVolts[0]
min := d.adcPiraniVolts[0]
for _, val := range d.adcPiraniVolts {
if val < min {
min = val
}
if val > max {
max = val
}
}
max_bar := math.Pow(10.0, float64(max)-8.5);
max_mbar := float32(max_bar * 1000.0)
min_bar := math.Pow(10.0, float64(min)-8.5);
min_mbar := float32(min_bar * 1000.0)
return max_mbar - min_mbar
}
// pirani returns the Pirani gauge voltage and pressure.
func (d *daemon) pirani() (volts float32, mbar float32) {
d.mu.RLock()