max31856.h

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#pragma once
 
#include "esphome/components/sensor/sensor.h"
#include "esphome/components/spi/spi.h"
#include "esphome/core/component.h"
 
#include <cinttypes>
 
namespace esphome::max31856 {
 
enum MAX31856RegisterMasks { SPI_WRITE_M = 0x80 };
 
enum MAX31856Registers {
  MAX31856_CR0_REG = 0x00,          
  MAX31856_CR0_AUTOCONVERT = 0x80,  
  MAX31856_CR0_1SHOT = 0x40,        
  MAX31856_CR0_OCFAULT00 = 0x00,    
  MAX31856_CR0_OCFAULT01 = 0x10,    
  MAX31856_CR0_OCFAULT10 = 0x20,    
  MAX31856_CR0_CJ = 0x08,           
  MAX31856_CR0_FAULT = 0x04,        
  MAX31856_CR0_FAULTCLR = 0x02,     
 
  MAX31856_CR1_REG = 0x01,     
  MAX31856_MASK_REG = 0x02,    
  MAX31856_CJHF_REG = 0x03,    
  MAX31856_CJLF_REG = 0x04,    
  MAX31856_LTHFTH_REG = 0x05,  
  MAX31856_LTHFTL_REG = 0x06,  
  MAX31856_LTLFTH_REG = 0x07,  
  MAX31856_LTLFTL_REG = 0x08,  
  MAX31856_CJTO_REG = 0x09,    
  MAX31856_CJTH_REG = 0x0A,    
  MAX31856_CJTL_REG = 0x0B,    
  MAX31856_LTCBH_REG = 0x0C,   
  MAX31856_LTCBM_REG = 0x0D,   
  MAX31856_LTCBL_REG = 0x0E,   
  MAX31856_SR_REG = 0x0F,      
 
  MAX31856_FAULT_CJRANGE = 0x80,  
  MAX31856_FAULT_TCRANGE = 0x40,  
  MAX31856_FAULT_CJHIGH = 0x20,   
  MAX31856_FAULT_CJLOW = 0x10,    
  MAX31856_FAULT_TCHIGH = 0x08,   
  MAX31856_FAULT_TCLOW = 0x04,    
  MAX31856_FAULT_OVUV = 0x02,     
  MAX31856_FAULT_OPEN = 0x01,     
};
 
enum MAX31856ThermocoupleType {
  MAX31856_TCTYPE_B = 0b0000,   // 0x00
  MAX31856_TCTYPE_E = 0b0001,   // 0x01
  MAX31856_TCTYPE_J = 0b0010,   // 0x02
  MAX31856_TCTYPE_K = 0b0011,   // 0x03
  MAX31856_TCTYPE_N = 0b0100,   // 0x04
  MAX31856_TCTYPE_R = 0b0101,   // 0x05
  MAX31856_TCTYPE_S = 0b0110,   // 0x06
  MAX31856_TCTYPE_T = 0b0111,   // 0x07
  MAX31856_VMODE_G8 = 0b1000,   // 0x08
  MAX31856_VMODE_G32 = 0b1100,  // 0x12
};
 
enum MAX31856ConfigFilter {
  FILTER_60HZ = 0,
  FILTER_50HZ = 1,
};
 
class MAX31856Sensor : public sensor::Sensor,
                       public PollingComponent,
                       public spi::SPIDevice<spi::BIT_ORDER_MSB_FIRST, spi::CLOCK_POLARITY_LOW,
                                             spi::CLOCK_PHASE_TRAILING, spi::DATA_RATE_4MHZ> {
 public:
  void setup() override;
  void dump_config() override;
  void set_filter(MAX31856ConfigFilter filter) { this->filter_ = filter; }
  void set_thermocouple_type(MAX31856ThermocoupleType thermocouple_type) {
    this->thermocouple_type_ = thermocouple_type;
  }
  void update() override;
 
 protected:
  MAX31856ConfigFilter filter_;
  MAX31856ThermocoupleType thermocouple_type_;
 
  uint8_t read_register_(uint8_t reg);
  uint32_t read_register24_(uint8_t reg);
  void write_register_(uint8_t reg, uint8_t value);
 
  void one_shot_temperature_();
  bool has_fault_();
  void clear_fault_();
  void read_thermocouple_temperature_();
  void set_thermocouple_type_();
  void set_noise_filter_();
};
 
}  // namespace esphome::max31856