SHTCX Temperature and humidity sensor

Driver for the Sensirion SHTCX sensor. More...

Detailed Description

Driver for the Sensirion SHTCX sensor.

Files
file	shtcx.h
	Device driver interface for the SHTCX Temperature and humidity sensor.
file	shtcx_params.h
	Default parameters for the SHTCX Temperature and humidity sensor.
file	shtcx_regs.h
	Register definitions for SHTCX devices.

Data Structures
struct	shtcx_params_t
	settings struct with all relevant parameters More...
struct	shtcx_t
	device descriptor for the SHTCX More...

Macros
#define	SHTCX_I2C_ADDRESS   (0x70)
	SHTCX Default Address.

Enumerations
enum	{ SHTCX_OK , SHTCX_ERROR_BUS , SHTCX_ERROR_CRC , SHTCX_ERROR }

Functions
int8_t	shtcx_init (shtcx_t *const dev, const shtcx_params_t *params)
	Initializes the sensor and I2C. More...
int8_t	shtcx_read (const shtcx_t *dev, uint16_t *rel_humidity, int16_t *temperature)
	Reads all register values from the device. More...
int8_t	shtcx_id (const shtcx_t *dev, uint16_t *id)
	Reads the ID and saves it in the device descriptor. More...
int8_t	shtcx_reset (const shtcx_t *dev)
	Resets sensor. More...

Enumeration Type Documentation

anonymous enum

anonymous enum

Enumerator
SHTCX_OK	Success, no error.
SHTCX_ERROR_BUS	I2C bus error.
SHTCX_ERROR_CRC	CRC error.
SHTCX_ERROR	General error.

Definition at line 62 of file shtcx.h.

Function Documentation

shtcx_id()

int8_t shtcx_id	(	const shtcx_t *	dev,
		uint16_t *	id
	)

Reads the ID and saves it in the device descriptor.

When working correctly ID should equal xxxx'xxxx'xx00'0111 where x is unspecified.

Parameters

[in]	dev	The I2C device descriptor.
[in]	id	ID of the device.

Returns

SHTCX_OK on everything done.

SHTCX_ERROR_BUS on error.

shtcx_init()

int8_t shtcx_init	(	shtcx_t *const	dev,
		const shtcx_params_t *	params
	)

Initializes the sensor and I2C.

Parameters

[in]	dev	I2C device descriptor.
[in]	params	SHTCX parameters to be used.

Returns

SHTCX_OK on a working initialization.

SHTCX_ERROR_BUS Reading I2C failed.

SHTCX_ERROR_CRC Wrong ID.

shtcx_read()

int8_t shtcx_read	(	const shtcx_t *	dev,
		uint16_t *	rel_humidity,
		int16_t *	temperature
	)

Reads all register values from the device.

The values as raw data will be saved into received.

Parameters

[in]	dev	The I2C device descriptor.
[in]	rel_humidity	Humidity in centi %.
[in]	temperature	Temperature in centi °C.

Returns

SHTCX_OK if a measurement completed.

SHTCX_ERROR_BUS reading I2C failed.

SHTCX_ERROR_CRC on checksum error.

shtcx_reset()

int8_t shtcx_reset

(

const shtcx_t *

dev

)

Resets sensor.

This will reset all internal state machines and reload calibration data from the memory.

Parameters

[in]

dev

The I2C device descriptor.

Returns

SHTCX_OK on everything done.

SHTCX_ERROR_BUS on error.