firmware/controllers/sensors/converters/resistance_func.cpp
| Line | Branch | Decision | Exec | Source |
|---|---|---|---|---|
| 1 | /** | |||
| 2 | * @author Matthew Kennedy, (c) 2019 | |||
| 3 | */ | |||
| 4 | ||||
| 5 | #include "resistance_func.h" | |||
| 6 | ||||
| 7 | 7 | void ResistanceFunc::configure(float supplyVoltage, float pullupResistor, bool isPulldown) { | ||
| 8 | 7 | m_pullupResistor = pullupResistor; | ||
| 9 | 7 | m_supplyVoltage = supplyVoltage; | ||
| 10 | 7 | m_isPulldown = isPulldown; | ||
| 11 | 7 | } | ||
| 12 | ||||
| 13 | 18 | SensorResult ResistanceFunc::convert(float raw) const { | ||
| 14 | // If the voltage is very low, the sensor is a dead short. | |||
| 15 |
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18 | if (raw < 0.05f) { |
| 16 | 2 | return UnexpectedCode::Low; | ||
| 17 | } | |||
| 18 | ||||
| 19 | // If the voltage is very high (98% VCC), the sensor is open circuit. | |||
| 20 |
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16 | if (raw > (m_supplyVoltage * 0.98f)) { |
| 21 | 2 | return UnexpectedCode::High; | ||
| 22 | } | |||
| 23 | ||||
| 24 |
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14 | if (m_isPulldown) { |
| 25 | // If the sensor is on the high side (fixed resistor is pulldown), | |||
| 26 | // invert the voltage so the math comes out correctly | |||
| 27 | 4 | raw = m_supplyVoltage - raw; | ||
| 28 | } | |||
| 29 | ||||
| 30 | // Voltage is in a sensible range - convert | |||
| 31 | 14 | float resistance = m_pullupResistor / (m_supplyVoltage / raw - 1); | ||
| 32 | ||||
| 33 | 14 | return resistance; | ||
| 34 | } | |||
| 35 |