mirror of
https://github.com/Threnklyn/esphome-dev.git
synced 2026-05-24 06:38:29 +02:00
DAVe3283
36ffef083b
In a heavy EMI environment, reading the current config from the MAX31865 can fail, such as switching from a 4-wire sensor to a 3-wire sensor. This causes the temperature value to be off wildly, but still technically valid, so it doesn't get reported as a sensor failure. Since we know what configuration we want, rather than send it to the MAX31865 on setup and ask for it over and over (propagating any error as we write it back), instead store the base configuration and work from that to change modes. This not only avoids propagating any error, it also saves a lot of unnecessary reads from the MAX31865.
59 lines
1.9 KiB
C++
59 lines
1.9 KiB
C++
#pragma once
|
|
|
|
#include "esphome/core/component.h"
|
|
#include "esphome/components/sensor/sensor.h"
|
|
#include "esphome/components/spi/spi.h"
|
|
|
|
namespace esphome {
|
|
namespace max31865 {
|
|
|
|
enum MAX31865RegisterMasks { SPI_WRITE_M = 0x80 };
|
|
enum MAX31865Registers {
|
|
CONFIGURATION_REG = 0x00,
|
|
RTD_RESISTANCE_MSB_REG = 0x01,
|
|
RTD_RESISTANCE_LSB_REG = 0x02,
|
|
FAULT_THRESHOLD_H_MSB_REG = 0x03,
|
|
FAULT_THRESHOLD_H_LSB_REG = 0x04,
|
|
FAULT_THRESHOLD_L_MSB_REG = 0x05,
|
|
FAULT_THRESHOLD_L_LSB_REG = 0x06,
|
|
FAULT_STATUS_REG = 0x07,
|
|
};
|
|
enum MAX31865ConfigFilter {
|
|
FILTER_60HZ = 0,
|
|
FILTER_50HZ = 1,
|
|
};
|
|
|
|
class MAX31865Sensor : 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 set_reference_resistance(float reference_resistance) { reference_resistance_ = reference_resistance; }
|
|
void set_nominal_resistance(float nominal_resistance) { rtd_nominal_resistance_ = nominal_resistance; }
|
|
void set_filter(MAX31865ConfigFilter filter) { filter_ = filter; }
|
|
void set_num_rtd_wires(uint8_t rtd_wires) { rtd_wires_ = rtd_wires; }
|
|
void setup() override;
|
|
void dump_config() override;
|
|
float get_setup_priority() const override;
|
|
|
|
void update() override;
|
|
|
|
protected:
|
|
float reference_resistance_;
|
|
float rtd_nominal_resistance_;
|
|
MAX31865ConfigFilter filter_;
|
|
uint8_t rtd_wires_;
|
|
uint8_t base_config_;
|
|
bool has_fault_ = false;
|
|
bool has_warn_ = false;
|
|
void read_data_();
|
|
void write_config_(uint8_t mask, uint8_t bits, uint8_t start_position = 0);
|
|
void write_register_(uint8_t reg, uint8_t value);
|
|
const uint8_t read_register_(uint8_t reg);
|
|
const uint16_t read_register_16_(uint8_t reg);
|
|
float calc_temperature_(const float& rtd_ratio);
|
|
};
|
|
|
|
} // namespace max31865
|
|
} // namespace esphome
|