Helmut Tschemernjak / HELIOS_Si7021

Generic Si7021 Temp/Hum sensor library

Dependents:   Turtle_RadioShuttle

HELIOS_Si7021.h@0:19633f4a946b, 2019-03-29 (annotated)

Committer:
Helmut64
Date:
Fri Mar 29 13:24:58 2019 +0000
Revision:
0:19633f4a946b
Child:
1:5ea2d9a2ef8c
Si7021 library

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Helmut64 0:19633f4a946b 1 /*
Helmut64 0:19633f4a946b 2 * Copyright (c) 2019 Helmut Tschemernjak
Helmut64 0:19633f4a946b 3 * 30826 Garbsen (Hannover) Germany
Helmut64 0:19633f4a946b 4 * Licensed under the Apache License, Version 2.0);
Helmut64 0:19633f4a946b 5 */
Helmut64 0:19633f4a946b 6
Helmut64 0:19633f4a946b 7 #ifndef __HELIOS_Si7021_H__
Helmut64 0:19633f4a946b 8 #define __HELIOS_Si7021_H__
Helmut64 0:19633f4a946b 9
Helmut64 0:19633f4a946b 10 class HELIOS_Si7021 {
Helmut64 0:19633f4a946b 11 public:
Helmut64 0:19633f4a946b 12 HELIOS_Si7021(PinName sda, PinName scl);
Helmut64 0:19633f4a946b 13 ~HELIOS_Si7021();
Helmut64 0:19633f4a946b 14
Helmut64 0:19633f4a946b 15 void reset(void);
Helmut64 0:19633f4a946b 16 void readSerialNumber(void);
Helmut64 0:19633f4a946b 17 uint8_t getRevision(void) { return _revision; };
Helmut64 0:19633f4a946b 18 bool hasSensor(void) { return _foundDevice; };
Helmut64 0:19633f4a946b 19
Helmut64 0:19633f4a946b 20 float readTemperature(void);
Helmut64 0:19633f4a946b 21 float readHumidity(void);
Helmut64 0:19633f4a946b 22
Helmut64 0:19633f4a946b 23 enum sensorType {
Helmut64 0:19633f4a946b 24 SI_Engineering_Samples,
Helmut64 0:19633f4a946b 25 SI_7013,
Helmut64 0:19633f4a946b 26 SI_7020,
Helmut64 0:19633f4a946b 27 SI_7021,
Helmut64 0:19633f4a946b 28 SI_unkown,
Helmut64 0:19633f4a946b 29 };
Helmut64 0:19633f4a946b 30 const char *getModelName(void);
Helmut64 0:19633f4a946b 31 sensorType getModel(void);
Helmut64 0:19633f4a946b 32
Helmut64 0:19633f4a946b 33 private:
Helmut64 0:19633f4a946b 34 I2C *_i2c;
Helmut64 0:19633f4a946b 35 char _data[8];
Helmut64 0:19633f4a946b 36
Helmut64 0:19633f4a946b 37 bool _foundDevice;
Helmut64 0:19633f4a946b 38 void _readRevision(void);
Helmut64 0:19633f4a946b 39 uint32_t sernum_a, sernum_b;
Helmut64 0:19633f4a946b 40 sensorType _model;
Helmut64 0:19633f4a946b 41 uint8_t _revision;
Helmut64 0:19633f4a946b 42 uint8_t _readRegister8(uint8_t reg);
Helmut64 0:19633f4a946b 43 uint16_t _readRegister16(uint8_t reg);
Helmut64 0:19633f4a946b 44 void _writeRegister8(uint8_t reg, uint8_t value);
Helmut64 0:19633f4a946b 45 const static u_int8_t _i2caddr = 0x40 << 1; // convert from 7 to 8 bit.
Helmut64 0:19633f4a946b 46 const static int _TRANSACTION_TIMEOUT = 100; // Wire NAK/Busy timeout in ms
Helmut64 0:19633f4a946b 47 };
Helmut64 0:19633f4a946b 48
Helmut64 0:19633f4a946b 49 /**************************************************************************/
Helmut64 0:19633f4a946b 50
Helmut64 0:19633f4a946b 51 #endif // __HELIOS_Si7021_H__
Helmut64 0:19633f4a946b 52