Public function

Functions
void	htu21d_cfg_setup (htu21d_cfg_t *cfg)
	Config Object Initialization function.
HTU21D_RETVAL	htu21d_init (htu21d_t *ctx, htu21d_cfg_t *cfg)
	Initialization function.
void	htu21d_generic_write (htu21d_t *ctx, uint8_t reg, uint8_t *data_buf, uint8_t len)
	Generic write function.
void	htu21d_generic_read (htu21d_t *ctx, uint8_t reg, uint8_t *data_buf, uint8_t len)
	Generic read function.
uint32_t	htu21d_read_data (htu21d_t *ctx, uint8_t reg_adr)
	Generic read 24-bit data function.
void	htu21d_send_cmd (htu21d_t *ctx, uint8_t cmd_byte)
	Send command function.
float	htu21d_get_temperature (htu21d_t *ctx)
	Get temperature value function.
float	htu21d_get_humidity (htu21d_t *ctx)
	Get humidity value function.

Detailed Description

Function Documentation

htu21d_cfg_setup()

void htu21d_cfg_setup

(

htu21d_cfg_t *

cfg

)

Config Object Initialization function.

Parameters

cfg	Click configuration structure.

@description This function initializes click configuration structure to init state.

Note

All used pins will be set to unconnected state.

htu21d_generic_read()

void htu21d_generic_read	(	htu21d_t *	ctx,
		uint8_t	reg,
		uint8_t *	data_buf,
		uint8_t	len )

Generic read function.

Data read function.

Parameters

ctx	Click object.
reg	Register address.
data_buf	Output data buf
len	Number of the bytes to be read

@description This function reads data from the desired register.

htu21d_generic_write()

void htu21d_generic_write	(	htu21d_t *	ctx,
		uint8_t	reg,
		uint8_t *	data_buf,
		uint8_t	len )

Generic write function.

Parameters

ctx	Click object.
reg	Register address.
data_buf	Data buf to be written.
len	Number of the bytes in data buf.

@description This function writes data to the desired register.

htu21d_get_humidity()

float htu21d_get_humidity

(

htu21d_t *

ctx

)

Get humidity value function.

Parameters

ctx	Click object.

Returns

float humidity data percentage.

@description Function read and calculate humidity percentage from the HTU21D sensor.

htu21d_get_temperature()

float htu21d_get_temperature

(

htu21d_t *

ctx

)

Get temperature value function.

Parameters

ctx	Click object.

Returns

float temperature data degrees Celsius.

@description Function read and calculate temperature in degrees Celsius from the HTU21D sensor.

htu21d_init()

HTU21D_RETVAL htu21d_init	(	htu21d_t *	ctx,
		htu21d_cfg_t *	cfg )

Initialization function.

Parameters

htu21d	Click object.
cfg	Click configuration structure.

@description This function initializes all necessary pins and peripherals used for this click.

htu21d_read_data()

uint32_t htu21d_read_data	(	htu21d_t *	ctx,
		uint8_t	reg_adr )

Generic read 24-bit data function.

Parameters

ctx	Click object.
reg_adr	Register address.

Returns

24-bit data from addressed register from HTU21D.

@description Function read 24-bit data from register address of HTU21D.

htu21d_send_cmd()

void htu21d_send_cmd	(	htu21d_t *	ctx,
		uint8_t	cmd_byte )

Send command function.

Parameters

ctx	Click object.
cmd_byte	Command byte.

@description Function sends command to HTU21D.

Note

It takes ~ 15 ms delay to reset.