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MAX31865.h
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MAX31865.h
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/***************************************************
This is a library for the Adafruit PT100/P1000 RTD Sensor w/MAX31865
Designed specifically to work with the Adafruit RTD Sensor
----> https://www.adafruit.com/products/3328
This sensor uses SPI to communicate, 4 pins are required to
interface
Adafruit invests time and resources providing this open source code,
please support Adafruit and open-source hardware by purchasing
products from Adafruit!
Written by Limor Fried/Ladyada for Adafruit Industries.
BSD license, all text above must be included in any redistribution
****************************************************/
#ifndef MAX31865_MAX31865_H
#define MAX31865_MAX31865_H
// Constants for the module config
#define MAX31856_CONFIG_REG 0x00
#define MAX31856_CONFIG_BIAS 0x80
#define MAX31856_CONFIG_MODEAUTO 0x40
#define MAX31856_CONFIG_MODEOFF 0x00
#define MAX31856_CONFIG_1SHOT 0x20
#define MAX31856_CONFIG_3WIRE 0x10
#define MAX31856_CONFIG_24WIRE 0x00
#define MAX31856_CONFIG_FAULTSTAT 0x02
#define MAX31856_CONFIG_FILT50HZ 0x01
#define MAX31856_CONFIG_FILT60HZ 0x00
#define MAX31856_RTDMSB_REG 0x01
#define MAX31856_RTDLSB_REG 0x02
#define MAX31856_HFAULTMSB_REG 0x03
#define MAX31856_HFAULTLSB_REG 0x04
#define MAX31856_LFAULTMSB_REG 0x05
#define MAX31856_LFAULTLSB_REG 0x06
#define MAX31856_FAULTSTAT_REG 0x07
#define MAX31865_FAULT_HIGHTHRESH 0x80
#define MAX31865_FAULT_LOWTHRESH 0x40
#define MAX31865_FAULT_REFINLOW 0x20
#define MAX31865_FAULT_REFINHIGH 0x10
#define MAX31865_FAULT_RTDINLOW 0x08
#define MAX31865_FAULT_OVUV 0x04
#define RTD_A 3.9083e-3
#define RTD_B (-5.775e-7)
#include <cstdint>
typedef enum max31865_numwires {
MAX31865_2WIRE = 0,
MAX31865_3WIRE = 1,
MAX31865_4WIRE = 0
} max31865_numwires_t;
class MAX31865 {
public:
MAX31865(int channel, int speed);
bool begin(max31865_numwires_t x = MAX31865_2WIRE);
uint8_t readFault();
void clearFault();
uint16_t readRTD();
void setWires(max31865_numwires_t wires);
void autoConvert(bool b);
void enableBias(bool b);
float temperature(float RTDnominal, float refResistor);
private:
int8_t _sclk, _miso, _mosi, _cs;
void readRegisterN(uint8_t addr, uint8_t buffer[], uint8_t n);
uint8_t readRegister8(uint8_t addr);
uint16_t readRegister16(uint8_t addr);
void writeRegister8(uint8_t addr, uint8_t reg);
uint8_t spixfer(uint8_t addr);
};
#endif //MAX31865_MAX31865_H