Public function

Functions
void	dht222_cfg_setup (dht222_cfg_t *cfg)
	Config Object Initialization function.
err_t	dht222_init (dht222_t *ctx, dht222_cfg_t *cfg)
	Initialization function.
err_t	dht222_read_reg (dht222_t *ctx, uint8_t address, uint8_t *data_out, uint8_t len)
	Generic read function.
err_t	dht222_write_reg (dht222_t *ctx, uint8_t address, uint8_t *data_in, uint8_t len)
	Generic write function.
err_t	dht222_get_temperature (dht222_t *ctx, uint16_t *temperature)
	Reads temperature from AM2322 sensor.
err_t	dht222_get_humidity (dht222_t *ctx, uint16_t *humidity)
	Reads humidity from AM2322 sensor.
err_t	dht222_get_temp_hum (dht222_t *ctx, uint16_t *temperature, uint16_t *humidity)
	Reads temperature and humidity from AM2322 sensor.

Detailed Description

Function Documentation

dht222_cfg_setup()

void dht222_cfg_setup

(

dht222_cfg_t *

cfg

)

Config Object Initialization function.

Parameters

cfg	Click configuration structure.

This function initializes click configuration structure to init state.

Note

All used pins will be set to unconnected state.

dht222_get_humidity()

err_t dht222_get_humidity	(	dht222_t *	ctx,
		uint16_t *	humidity )

Reads humidity from AM2322 sensor.

Parameters

ctx	Click object
humidity	16-bit humidity data

The function reads the humidity data from the sensor AM2322 on the DHT22 2 Click.

Returns

• 0 - Success,
• -1 - Error. See #err_t definition for detailed explanation.

Note

The 16-bit humidity data should be divided by 10 to obtain the exact humidity value in percentage [ % ].

dht222_get_temp_hum()

err_t dht222_get_temp_hum	(	dht222_t *	ctx,
		uint16_t *	temperature,
		uint16_t *	humidity )

Reads temperature and humidity from AM2322 sensor.

Parameters

ctx	Click object
temperature	16-bit temperature data
humidity	16-bit humidity data

The function reads the temperature and humidity data from the sensor AM2322 on the DHT22 2 Click.

Returns

• 0 - Success,
• -1 - Error. See #err_t definition for detailed explanation.

Note

The 16-bit temperature and humidity data should be divided by 10 to obtain the exact values in degrees Celsius [ C ] and percentage [ % ].

dht222_get_temperature()

err_t dht222_get_temperature	(	dht222_t *	ctx,
		uint16_t *	temperature )

Reads temperature from AM2322 sensor.

Parameters

ctx	Click object
temperature	16-bit temperature data

The function reads the temperature data from the sensor AM2322 on the DHT22 2 Click.

Returns

• 0 - Success,
• -1 - Error. See #err_t definition for detailed explanation.

Note

The 16-bit temperature data should be divided by 10 to obtain the exact temperature value in degrees Celsius [ C ].

dht222_init()

err_t dht222_init	(	dht222_t *	ctx,
		dht222_cfg_t *	cfg )

Initialization function.

Parameters

ctx	Click object
cfg	Click configuration structure.

Returns

• 0 - Success,
• -1 - Error. See #err_t definition for detailed explanation.

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

dht222_read_reg()

err_t dht222_read_reg	(	dht222_t *	ctx,
		uint8_t	address,
		uint8_t *	data_out,
		uint8_t	len )

Generic read function.

Parameters

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

Returns

• 0 - Success,
• -1 - Error. See #err_t definition for detailed explanation.

This function reads data from the desired register.

dht222_write_reg()

err_t dht222_write_reg	(	dht222_t *	ctx,
		uint8_t	address,
		uint8_t *	data_in,
		uint8_t	len )

Generic write function.

Parameters

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

Returns

• 0 - Success,
• -1 - Error. See #err_t definition for detailed explanation.

This function writes data to the desired register.