Line data    Source code

       1             : /*
       2             :  * Copyright (C) 2023 Kraus Hamdani Aerospace Inc. All rights reserved.
       3             :  *
       4             :  * This file is free software: you can redistribute it and/or modify it
       5             :  * under the terms of the GNU General Public License as published by the
       6             :  * Free Software Foundation, either version 3 of the License, or
       7             :  * (at your option) any later version.
       8             :  *
       9             :  * This file is distributed in the hope that it will be useful, but
      10             :  * WITHOUT ANY WARRANTY; without even the implied warranty of
      11             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
      12             :  * See the GNU General Public License for more details.
      13             :  *
      14             :  * You should have received a copy of the GNU General Public License along
      15             :  * with this program.  If not, see <http://www.gnu.org/licenses/>.
      16             :  *
      17             :  * Code by Tom Pittenger
      18             :  */
      19             : /*
      20             :     Implements SPI driver for MAX31865 digital RTD Temperature converter
      21             : */
      22             : 
      23             : #pragma once
      24             : #include "AP_TemperatureSensor_Backend.h"
      25             : 
      26             : #if AP_TEMPERATURE_SENSOR_MAX31865_ENABLED
      27             : 
      28             : class AP_TemperatureSensor_MAX31865 : public AP_TemperatureSensor_Backend {
      29             : public:
      30             :     AP_TemperatureSensor_MAX31865(AP_TemperatureSensor &front, AP_TemperatureSensor::TemperatureSensor_State &state, AP_TemperatureSensor_Params &params);
      31             : 
      32             :     __INITFUNC__ void init(void) override;
      33             : 
      34           0 :     void update(void) override {};
      35             : 
      36             :     static const struct AP_Param::GroupInfo var_info[];
      37             : 
      38             : private:
      39             : 
      40             :     // Vbias = ON (must be on for automatic mode)
      41             :     // Conversion mode: Auto
      42             :     // Fault Status: 1set 1 to Clear all latched faults
      43             :     uint8_t config_register = 0b11000010;
      44             : 
      45             :     AP_Float nominal_resistance;
      46             :     AP_Float reference_resistance;
      47             : 
      48             :     // Convert raw value in to temperature in deg celsius
      49             :     float calculate_temperature(const uint16_t raw) const;
      50             : 
      51             :     void thread_tick(void);
      52             : };
      53             : 
      54             : #endif // AP_TEMPERATURE_SENSOR_MAX31865_ENABLED