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101 lines
4.2 KiB
C++
101 lines
4.2 KiB
C++
#pragma once
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#include "esphome/components/sensor/sensor.h"
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#include "esphome/components/spi/spi.h"
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#include "esphome/core/component.h"
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#include <cinttypes>
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namespace esphome {
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namespace max31856 {
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enum MAX31856RegisterMasks { SPI_WRITE_M = 0x80 };
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enum MAX31856Registers {
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MAX31856_CR0_REG = 0x00, ///< Config 0 register
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MAX31856_CR0_AUTOCONVERT = 0x80, ///< Config 0 Auto convert flag
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MAX31856_CR0_1SHOT = 0x40, ///< Config 0 one shot convert flag
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MAX31856_CR0_OCFAULT00 = 0x00, ///< Config 0 open circuit fault 00 flag
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MAX31856_CR0_OCFAULT01 = 0x10, ///< Config 0 open circuit fault 01 flag
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MAX31856_CR0_OCFAULT10 = 0x20, ///< Config 0 open circuit fault 10 flag
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MAX31856_CR0_CJ = 0x08, ///< Config 0 cold junction disable flag
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MAX31856_CR0_FAULT = 0x04, ///< Config 0 fault mode flag
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MAX31856_CR0_FAULTCLR = 0x02, ///< Config 0 fault clear flag
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MAX31856_CR1_REG = 0x01, ///< Config 1 register
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MAX31856_MASK_REG = 0x02, ///< Fault Mask register
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MAX31856_CJHF_REG = 0x03, ///< Cold junction High temp fault register
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MAX31856_CJLF_REG = 0x04, ///< Cold junction Low temp fault register
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MAX31856_LTHFTH_REG = 0x05, ///< Linearized Temperature High Fault Threshold Register, MSB
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MAX31856_LTHFTL_REG = 0x06, ///< Linearized Temperature High Fault Threshold Register, LSB
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MAX31856_LTLFTH_REG = 0x07, ///< Linearized Temperature Low Fault Threshold Register, MSB
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MAX31856_LTLFTL_REG = 0x08, ///< Linearized Temperature Low Fault Threshold Register, LSB
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MAX31856_CJTO_REG = 0x09, ///< Cold-Junction Temperature Offset Register
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MAX31856_CJTH_REG = 0x0A, ///< Cold-Junction Temperature Register, MSB
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MAX31856_CJTL_REG = 0x0B, ///< Cold-Junction Temperature Register, LSB
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MAX31856_LTCBH_REG = 0x0C, ///< Linearized TC Temperature, Byte 2
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MAX31856_LTCBM_REG = 0x0D, ///< Linearized TC Temperature, Byte 1
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MAX31856_LTCBL_REG = 0x0E, ///< Linearized TC Temperature, Byte 0
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MAX31856_SR_REG = 0x0F, ///< Fault Status Register
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MAX31856_FAULT_CJRANGE = 0x80, ///< Fault status Cold Junction Out-of-Range flag
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MAX31856_FAULT_TCRANGE = 0x40, ///< Fault status Thermocouple Out-of-Range flag
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MAX31856_FAULT_CJHIGH = 0x20, ///< Fault status Cold-Junction High Fault flag
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MAX31856_FAULT_CJLOW = 0x10, ///< Fault status Cold-Junction Low Fault flag
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MAX31856_FAULT_TCHIGH = 0x08, ///< Fault status Thermocouple Temperature High Fault flag
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MAX31856_FAULT_TCLOW = 0x04, ///< Fault status Thermocouple Temperature Low Fault flag
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MAX31856_FAULT_OVUV = 0x02, ///< Fault status Overvoltage or Undervoltage Input Fault flag
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MAX31856_FAULT_OPEN = 0x01, ///< Fault status Thermocouple Open-Circuit Fault flag
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};
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/**
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* Multiple types of thermocouples supported by the chip.
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* Currently only K type implemented here.
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*/
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enum MAX31856ThermocoupleType {
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MAX31856_TCTYPE_B = 0b0000, // 0x00
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MAX31856_TCTYPE_E = 0b0001, // 0x01
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MAX31856_TCTYPE_J = 0b0010, // 0x02
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MAX31856_TCTYPE_K = 0b0011, // 0x03
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MAX31856_TCTYPE_N = 0b0100, // 0x04
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MAX31856_TCTYPE_R = 0b0101, // 0x05
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MAX31856_TCTYPE_S = 0b0110, // 0x06
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MAX31856_TCTYPE_T = 0b0111, // 0x07
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MAX31856_VMODE_G8 = 0b1000, // 0x08
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MAX31856_VMODE_G32 = 0b1100, // 0x12
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};
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enum MAX31856ConfigFilter {
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FILTER_60HZ = 0,
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FILTER_50HZ = 1,
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};
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class MAX31856Sensor : public sensor::Sensor,
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public PollingComponent,
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public spi::SPIDevice<spi::BIT_ORDER_MSB_FIRST, spi::CLOCK_POLARITY_LOW,
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spi::CLOCK_PHASE_TRAILING, spi::DATA_RATE_4MHZ> {
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public:
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void setup() override;
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void dump_config() override;
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float get_setup_priority() const override;
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void set_filter(MAX31856ConfigFilter filter) { filter_ = filter; }
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void update() override;
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protected:
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MAX31856ConfigFilter filter_;
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uint8_t read_register_(uint8_t reg);
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uint32_t read_register24_(uint8_t reg);
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void write_register_(uint8_t reg, uint8_t value);
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void one_shot_temperature_();
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bool has_fault_();
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void clear_fault_();
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void read_thermocouple_temperature_();
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void set_thermocouple_type_();
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void set_noise_filter_();
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};
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} // namespace max31856
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} // namespace esphome
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