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[driver] Add MAX31865 driver with STM32F469 Discovery example
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| Original file line number | Diff line number | Diff line change |
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| // coding: utf-8 | ||
| /* | ||
| * Copyright (c) 2023, Henrik Hose | ||
| * | ||
| * This file is part of the modm project. | ||
| * | ||
| * This Source Code Form is subject to the terms of the Mozilla Public | ||
| * License, v. 2.0. If a copy of the MPL was not distributed with this | ||
| * file, You can obtain one at http://mozilla.org/MPL/2.0/. | ||
| */ | ||
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| #include <modm/board.hpp> | ||
| #include <modm/driver/temperature/max31865.hpp> | ||
| #include <modm/processing.hpp> | ||
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| using namespace Board; | ||
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| using SpiMaster = modm::platform::SpiMaster2; | ||
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| using Cs = D9; | ||
| using Mosi = D11; | ||
| using Miso = D12; | ||
| using Sck = D13; | ||
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| class ThermocoupleThread : public modm::pt::Protothread | ||
| { | ||
| public: | ||
| ThermocoupleThread() : data{}, pt100(data) {} | ||
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| bool | ||
| run() | ||
| { | ||
| PT_BEGIN(); | ||
| pt100.initialize(); | ||
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| while (true) | ||
| { | ||
| MODM_LOG_INFO << "\nNew readout:" << modm::endl; | ||
| RF_CALL_BLOCKING(pt100.readout()); | ||
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| MODM_LOG_INFO << " resistance : " << data.getResistance() << " Ohm" | ||
| << modm::endl; | ||
| MODM_LOG_INFO << " temperature fast: " << data.getTemperatureFast() << " degrees" | ||
| << modm::endl; | ||
| MODM_LOG_INFO << " temperature precise: " << data.getTemperaturePrecise() << " degrees" | ||
| << modm::endl; | ||
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| timeout.restart(std::chrono::milliseconds(1000)); | ||
| PT_WAIT_UNTIL(timeout.isExpired()); | ||
| } | ||
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| PT_END(); | ||
| } | ||
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| private: | ||
| modm::max31865pt100::Data data; | ||
| modm::Max31865<SpiMaster, Cs> pt100; | ||
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| modm::ShortTimeout timeout; | ||
| }; | ||
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| ThermocoupleThread pt100Thread{}; | ||
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| int | ||
| main() | ||
| { | ||
| Board::initialize(); | ||
| Cs::setOutput(modm::Gpio::High); | ||
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| SpiMaster::connect<Miso::Miso, Mosi::Mosi, Sck::Sck>(); | ||
| SpiMaster::initialize<Board::SystemClock, 351_kHz>(); | ||
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| MODM_LOG_INFO << "==========MAX 31865 Test==========" << modm::endl; | ||
| MODM_LOG_DEBUG << "Debug logging here" << modm::endl; | ||
| MODM_LOG_INFO << "Info logging here" << modm::endl; | ||
| MODM_LOG_WARNING << "Warning logging here" << modm::endl; | ||
| MODM_LOG_ERROR << "Error logging here" << modm::endl; | ||
| MODM_LOG_INFO << "===============================" << modm::endl; | ||
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| while (true) | ||
| { | ||
| pt100Thread.run(); | ||
| Board::LedOrange::toggle(); | ||
| } | ||
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| return 0; | ||
| } |
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| <library> | ||
| <extends>modm:disco-f469ni</extends> | ||
| <options> | ||
| <option name="modm:build:build.path">../../../build/stm32f469_discovery/max31865</option> | ||
| </options> | ||
| <modules> | ||
| <module>modm:driver:max31865</module> | ||
| <module>modm:platform:gpio</module> | ||
| <module>modm:platform:spi:2</module> | ||
| <module>modm:processing:protothread</module> | ||
| <module>modm:processing:timer</module> | ||
| <module>modm:build:scons</module> | ||
| </modules> | ||
| </library> |
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| // coding: utf-8 | ||
| // ---------------------------------------------------------------------------- | ||
| /* | ||
| * Copyright (c) 2023, Henrik Hose | ||
| * | ||
| * This file is part of the modm project. | ||
| * | ||
| * This Source Code Form is subject to the terms of the Mozilla Public | ||
| * License, v. 2.0. If a copy of the MPL was not distributed with this | ||
| * file, You can obtain one at http://mozilla.org/MPL/2.0/. | ||
| */ | ||
| // ---------------------------------------------------------------------------- | ||
|
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| #ifndef MODM_MAX31865_HPP | ||
| #define MODM_MAX31865_HPP | ||
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| #include <array> | ||
| #include <modm/architecture/interface/register.hpp> | ||
| #include <modm/architecture/interface/spi_device.hpp> | ||
| #include <modm/processing/resumable.hpp> | ||
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| namespace modm | ||
| { | ||
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| /// @ingroup modm_driver_max31865 | ||
| // Standard values for IEC 751 (PT100) with 400 Ohm reference | ||
| template<float R0 = 100.f, float Rref = 430.f, float alpha = 3.85055e-3f, | ||
| double a = double{3.90830e-3}, double b = double{-5.77500e-7}, | ||
| double c = double{-4.18301e-12}> | ||
| struct max31865 | ||
| { | ||
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| enum class Fault : uint8_t | ||
| { | ||
| RtdHighThreshold = Bit7, | ||
| RtdLowThreshold = Bit6, | ||
| RefinMGreater85Percentbias = Bit5, | ||
| RefinMLess85PercentVbias = Bit4, | ||
| RtdinMLess85PercentVbias = Bit3, | ||
| OverUnderVoltage = Bit2 | ||
| }; | ||
| MODM_FLAGS8(Fault) | ||
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| enum class Config : uint8_t | ||
| { | ||
| VBias = Bit7, | ||
| ConversionModeAuto = Bit6, | ||
| OneShot = Bit5, | ||
| ThreeWire = Bit4, | ||
| FaultDetectionCycle1 = Bit3, | ||
| FaultDetectionCycle0 = Bit2, | ||
| FaultStatusClear = Bit1, | ||
| Rejection = Bit0 | ||
| }; | ||
| MODM_FLAGS8(Config) | ||
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| enum class FaultDetectionWrite : uint8_t | ||
| { | ||
| NoAction = 0b00, | ||
| FaultDetectionAutomaticDelay = 0b01, | ||
| RunFaultDetectionWithManualDelayCycle1 = 0b10, | ||
| FinishFaultDetectionWithManualDelayCycle2 = 0b11, | ||
| }; | ||
| typedef Configuration<Config_t, FaultDetectionWrite, 0b11, 2> | ||
| FaultDetectionWrite_t; // Bit 8..10 | ||
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| enum class FaultDetectionRead : uint8_t | ||
| { | ||
| FaultDetectionFinished = 0b00, | ||
| AutomaticDetectionStillRunning = 0b01, | ||
| ManualCycle1Running = | ||
| 0b10, // waiting for user to write FinishFaultDetectionWithManualDelayCycle2 | ||
| ManualCycle2StillRunning = 0b11, | ||
| }; | ||
| typedef Configuration<Config_t, FaultDetectionRead, 0b11, 2> FaultDetectionRead_t; // Bit 8..10 | ||
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| enum class Rejection : uint8_t | ||
| { | ||
| Rejection60Hz = 0b0, | ||
| Rejection50Hz = 0b1, | ||
| }; | ||
| typedef Configuration<Config_t, Rejection, 0b1> Rejection_t; // Bit 8..10 | ||
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| struct FaultThreshold | ||
| { | ||
| typedef uint16_t RtdResistance_t; | ||
| }; | ||
|
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| static constexpr uint16_t | ||
| rtdfaultthresh(const max31865::FaultThreshold::RtdResistance_t res) | ||
| { | ||
| return static_cast<uint16_t>(res << 1); | ||
| }; | ||
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| enum class Register : uint8_t | ||
| { | ||
| ReadConfiguration = 0x00, | ||
| ReadRtdMsb = 0x01, | ||
| ReadRtdLsb = 0x02, | ||
| ReadHighFaultThresholdMsb = 0x03, | ||
| ReadHighFaultThresholdLsb = 0x04, | ||
| ReadLowFaultThresholdMsb = 0x05, | ||
| ReadLowFaultThresholdLsb = 0x06, | ||
| ReadFaultStatus = 0x07, | ||
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| WriteConfiguration = 0x80, | ||
| WriteHighFaultThresholdMsb = 0x83, | ||
| WriteHighFaultThresholdLsb = 0x84, | ||
| WriteLowFaultThresholdMsb = 0x85, | ||
| WriteLowFaultThresholdLsb = 0x86, | ||
| }; | ||
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| struct modm_packed Data | ||
| { | ||
| /// @return measure resistance in ohm | ||
| constexpr float | ||
| getResistance() const | ||
| { | ||
| const uint16_t adccode = data >> 1; | ||
| return adccode / 32768.f * Rref; | ||
| } | ||
|
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| /// @return fast temperature in degrees celsius, about 0.3 degrees error between 0 and 100 | ||
| /// degrees celsius | ||
| constexpr float | ||
| getTemperatureFast() const | ||
| { | ||
| return (getResistance() - R0) / alpha / 100.f; | ||
| } | ||
|
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| /// @return slow but accurate temperature in degrees celsius | ||
| constexpr double | ||
| getTemperaturePrecise() const | ||
| { | ||
| const double res = getResistance(); | ||
| double T = getTemperatureFast(); | ||
| const double c0 = T <= 0 ? c : 0; | ||
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| // Do some fixed number of newton steps for root finding | ||
| // on Callendar Van Dusen equation: | ||
| // R = R0*(1+a*T+b*T*T+c*(T-100)*T*T*T) | ||
| // Newton seems to need double precision to achieve 1.e-10 residual?! | ||
| for (int i = 0; i < 10; i++) | ||
| { | ||
| const double R = | ||
| double{R0} * (1 + (a * T) + (b * T * T) + (c0 * (T - 100) * T * T * T)) - res; | ||
| const double Rdash = | ||
| double{R0} * (a + (2 * b * T) + c0 * (((4 * T) - 300) * T * T)); | ||
| T -= R / Rdash; | ||
| if (std::abs(R) <= 1.e-10) { break; } | ||
| } | ||
|
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| return T; | ||
| } | ||
|
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| uint16_t data; | ||
| }; | ||
| }; // struct max31865 | ||
|
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| using max31865pt100 = max31865<>; | ||
|
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| /** | ||
| * @tparam SpiMaster | ||
| * @tparam Cs | ||
| * | ||
| * @author Henrik Hose | ||
| * @ingroup modm_driver_max31865 | ||
| */ | ||
| template<typename SpiMaster, typename Cs> | ||
| class Max31865 : public max31865pt100, | ||
| public modm::SpiDevice<SpiMaster>, | ||
| protected modm::NestedResumable<3> | ||
| { | ||
| public: | ||
| /** | ||
| * @param data pointer to buffer of the internal data of type Data | ||
| */ | ||
| Max31865(Data &data); | ||
|
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| /// Call this function once before using the device | ||
| void | ||
| initialize(); | ||
|
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| /// Read the raw data from the sensor | ||
| modm::ResumableResult<void> | ||
| readout(); | ||
|
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| public: | ||
| /// Get the data object for this sensor | ||
| inline Data & | ||
| getData() | ||
| { | ||
| return data; | ||
| } | ||
|
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| private: | ||
| Data &data; | ||
| std::array<uint8_t, 2> buffer; | ||
| Config_t config; | ||
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| modm::ShortTimeout timeout; | ||
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| modm::ResumableResult<void> | ||
| writeSingleRegister(Register address, uint8_t data); | ||
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| modm::ResumableResult<uint8_t> | ||
| readSingleRegister(Register address); | ||
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| modm::ResumableResult<uint16_t> | ||
| readTwoRegisters(Register address); | ||
| }; | ||
|
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| } // namespace modm | ||
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| #include "max31865_impl.hpp" | ||
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| #endif // MODM_MAX31865_HPP |
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