I2C

---

The I2C API provides functions to control I2C peripherals connected to the IoT device.

Required Header

#include <peripheral_io.h>

Overview

This I2C API provides functions to control I2C peripherals connected to the IoT device.

Realted Features

This API is related with the following feature:

• http://tizen.org/feature/peripheral_io.i2c
  

It is recommended to use features in your application for reliability.

You can check if a IoT device supports the related features for this API
by using System Information, and control your application's actions accordingly.

To ensure your application is only running on the IoT device with specific features,
please define the features in your manifest file using the manifest editor in the SDK.

More details on featuring your application can be found from Feature Element.

Functions
int	peripheral_i2c_open (int bus, int address, peripheral_i2c_h *i2c)
	Opens an I2C slave device.
int	peripheral_i2c_close (peripheral_i2c_h i2c)
	Closes an I2C slave device.
int	peripheral_i2c_read (peripheral_i2c_h i2c, uint8_t *data, uint32_t length)
	Reads the bytes data from the I2C slave device.
int	peripheral_i2c_write (peripheral_i2c_h i2c, uint8_t *data, uint32_t length)
	Writes the bytes data to the I2C slave device.
int	peripheral_i2c_read_register_byte (peripheral_i2c_h i2c, uint8_t reg, uint8_t *data)
	Reads single byte data from the register of the I2C slave device.
int	peripheral_i2c_write_register_byte (peripheral_i2c_h i2c, uint8_t reg, uint8_t data)
	Writes single byte data to the register of the I2C slave device.
int	peripheral_i2c_read_register_word (peripheral_i2c_h i2c, uint8_t reg, uint16_t *data)
	Reads word data from the register of the I2C slave device.
int	peripheral_i2c_write_register_word (peripheral_i2c_h i2c, uint8_t reg, uint16_t data)
	Writes word data to the register of the I2C slave device.
Typedefs
typedef struct _peripheral_i2c_s *	peripheral_i2c_h
	The handle of the I2C slave device.

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Typedef Documentation

typedef struct _peripheral_i2c_s* peripheral_i2c_h

The handle of the I2C slave device.

Since :

4.0

---

Function Documentation

int peripheral_i2c_close

(

peripheral_i2c_h

i2c

)

Closes an I2C slave device.

Warning:

This is not for use by third-party applications.

Since :

4.0

Privilege Level:

platform

Privilege:

http://tizen.org/privilege/peripheralio

Parameters:

[in]

i2c

The I2C handle

Returns:

0 on success, otherwise a negative error value

Return values:

PERIPHERAL_ERROR_NONE	Successful
PERIPHERAL_ERROR_PERMISSION_DENIED	Permission denied
PERIPHERAL_ERROR_INVALID_PARAMETER	Invalid parameter
PERIPHERAL_ERROR_NOT_SUPPORTED	Not supported
PERIPHERAL_ERROR_UNKNOWN	Unknown internal error

Precondition:

peripheral_i2c_open()

int peripheral_i2c_open	(	int	bus,
		int	address,
		peripheral_i2c_h *	i2c
	)

Opens an I2C slave device.

Warning:

This is not for use by third-party applications.

Since :

4.0

Privilege Level:

platform

Privilege:

http://tizen.org/privilege/peripheralio

Remarks:

i2c should be released with peripheral_i2c_close()

Parameters:

[in]	bus	The I2C bus number that the slave device is connected
[in]	address	The address of the slave device
[out]	i2c	The I2C handle is created on success

Returns:

0 on success, otherwise a negative error value

Return values:

PERIPHERAL_ERROR_NONE	Successful
PERIPHERAL_ERROR_IO_ERROR	I/O operation failed
PERIPHERAL_ERROR_NO_DEVICE	Device does not exist or is removed
PERIPHERAL_ERROR_OUT_OF_MEMORY	Memory allocation failed
PERIPHERAL_ERROR_PERMISSION_DENIED	Permission denied
PERIPHERAL_ERROR_RESOURCE_BUSY	Device is in use
PERIPHERAL_ERROR_INVALID_PARAMETER	Invalid parameter
PERIPHERAL_ERROR_NOT_SUPPORTED	Not supported
PERIPHERAL_ERROR_UNKNOWN	Unknown internal error

Postcondition:

peripheral_i2c_close()

int peripheral_i2c_read	(	peripheral_i2c_h	i2c,
		uint8_t *	data,
		uint32_t	length
	)

Reads the bytes data from the I2C slave device.

Warning:

This is not for use by third-party applications.

Since :

4.0

Privilege Level:

platform

Privilege:

http://tizen.org/privilege/peripheralio

Parameters:

[in]	i2c	The I2C handle
[out]	data	The data buffer to read
[in]	length	The size of data buffer (in bytes)

Returns:

0 on success, otherwise a negative error value

Return values:

PERIPHERAL_ERROR_NONE	Successful
PERIPHERAL_ERROR_IO_ERROR	I/O operation failed
PERIPHERAL_ERROR_PERMISSION_DENIED	Permission denied
PERIPHERAL_ERROR_INVALID_PARAMETER	Invalid parameter
PERIPHERAL_ERROR_NOT_SUPPORTED	Not supported
PERIPHERAL_ERROR_UNKNOWN	Unknown internal error

See also:

peripheral_i2c_write()

int peripheral_i2c_read_register_byte	(	peripheral_i2c_h	i2c,
		uint8_t	reg,
		uint8_t *	data
	)

Reads single byte data from the register of the I2C slave device.

Warning:

This is not for use by third-party applications.

Since :

4.0

Privilege Level:

platform

Privilege:

http://tizen.org/privilege/peripheralio

Parameters:

[in]	i2c	The I2C handle
[in]	reg	The register address of the I2C slave device to read
[out]	data	The single byte data to read

Returns:

0 on success, otherwise a negative error value

Return values:

PERIPHERAL_ERROR_NONE	Successful
PERIPHERAL_ERROR_IO_ERROR	I/O operation failed
PERIPHERAL_ERROR_PERMISSION_DENIED	Permission denied
PERIPHERAL_ERROR_INVALID_PARAMETER	Invalid parameter
PERIPHERAL_ERROR_NOT_SUPPORTED	Not supported
PERIPHERAL_ERROR_UNKNOWN	Unknown internal error

See also:

peripheral_i2c_write_register_byte()

int peripheral_i2c_read_register_word	(	peripheral_i2c_h	i2c,
		uint8_t	reg,
		uint16_t *	data
	)

Reads word data from the register of the I2C slave device.

Warning:

This is not for use by third-party applications.

Since :

4.0

Privilege Level:

platform

Privilege:

http://tizen.org/privilege/peripheralio

Parameters:

[in]	i2c	The I2C handle
[in]	reg	The register address of the I2C slave device to read
[out]	data	The word(2 bytes) data to read

Returns:

0 on success, otherwise a negative error value

Return values:

PERIPHERAL_ERROR_NONE	Successful
PERIPHERAL_ERROR_IO_ERROR	I/O operation failed
PERIPHERAL_ERROR_PERMISSION_DENIED	Permission denied
PERIPHERAL_ERROR_INVALID_PARAMETER	Invalid parameter
PERIPHERAL_ERROR_NOT_SUPPORTED	Not supported
PERIPHERAL_ERROR_UNKNOWN	Unknown internal error

See also:

peripheral_i2c_write_register_word()

int peripheral_i2c_write	(	peripheral_i2c_h	i2c,
		uint8_t *	data,
		uint32_t	length
	)

Writes the bytes data to the I2C slave device.

Warning:

This is not for use by third-party applications.

Since :

4.0

Privilege Level:

platform

Privilege:

http://tizen.org/privilege/peripheralio

Parameters:

[in]	i2c	The I2C handle
[in]	data	The data buffer to write
[in]	length	The size of data buffer (in bytes)

Returns:

0 on success, otherwise a negative error value

Return values:

PERIPHERAL_ERROR_NONE	Successful
PERIPHERAL_ERROR_IO_ERROR	I/O operation failed
PERIPHERAL_ERROR_PERMISSION_DENIED	Permission denied
PERIPHERAL_ERROR_INVALID_PARAMETER	Invalid parameter
PERIPHERAL_ERROR_NOT_SUPPORTED	Not supported
PERIPHERAL_ERROR_UNKNOWN	Unknown internal error

See also:

peripheral_i2c_read()

int peripheral_i2c_write_register_byte	(	peripheral_i2c_h	i2c,
		uint8_t	reg,
		uint8_t	data
	)

Writes single byte data to the register of the I2C slave device.

Warning:

This is not for use by third-party applications.

Since :

4.0

Privilege Level:

platform

Privilege:

http://tizen.org/privilege/peripheralio

Parameters:

[in]	i2c	The I2C handle
[in]	reg	The register address of the I2C slave device to write
[in]	data	The single byte data to write

Returns:

0 on success, otherwise a negative error value

Return values:

PERIPHERAL_ERROR_NONE	Successful
PERIPHERAL_ERROR_IO_ERROR	I/O operation failed
PERIPHERAL_ERROR_PERMISSION_DENIED	Permission denied
PERIPHERAL_ERROR_INVALID_PARAMETER	Invalid parameter
PERIPHERAL_ERROR_NOT_SUPPORTED	Not supported
PERIPHERAL_ERROR_UNKNOWN	Unknown internal error

See also:

peripheral_i2c_read_register_byte()

int peripheral_i2c_write_register_word	(	peripheral_i2c_h	i2c,
		uint8_t	reg,
		uint16_t	data
	)

Writes word data to the register of the I2C slave device.

Warning:

This is not for use by third-party applications.

Since :

4.0

Privilege Level:

platform

Privilege:

http://tizen.org/privilege/peripheralio

Parameters:

[in]	i2c	The I2C handle
[in]	reg	The register address of the I2C slave device to write
[in]	data	The word(2 bytes) data to write

Returns:

0 on success, otherwise a negative error value

Return values:

PERIPHERAL_ERROR_NONE	Successful
PERIPHERAL_ERROR_IO_ERROR	I/O operation failed
PERIPHERAL_ERROR_PERMISSION_DENIED	Permission denied
PERIPHERAL_ERROR_INVALID_PARAMETER	Invalid parameter
PERIPHERAL_ERROR_NOT_SUPPORTED	Not supported
PERIPHERAL_ERROR_UNKNOWN	Unknown internal error

See also:

peripheral_i2c_read_register_word()