I2C

Collaboration diagram for I2C:

Modules
	i2c interrupt status definition
	i2c interrupt clear definition
	i2c interrupt enable definition
	i2c feature control cmd definition

Data Structures
struct	bflb_i2c_msg_s
	I2C message structure. More...

Macros
#define	I2C_M_READ   0x0001 /* Read data, from slave to master */
#define	I2C_M_TEN   0x0002 /* Ten bit address */
#define	I2C_M_DMA   0x0004 /* Enable dma mode */
#define	I2C_M_NOSTOP   0x0040 /* Message should not end with a STOP */
#define	I2C_M_NOSTART   0x0080 /* Message should not begin with a START */

Functions
void	bflb_i2c_init (struct bflb_device_s *dev, uint32_t frequency)
	Initialize i2c. More...
void	bflb_i2c_deinit (struct bflb_device_s *dev)
	Deinitialize i2c. More...
void	bflb_i2c_link_txdma (struct bflb_device_s *dev, bool enable)
	Enable i2c tx dma. More...
void	bflb_i2c_link_rxdma (struct bflb_device_s *dev, bool enable)
	Enable i2c rx dma. More...
int	bflb_i2c_transfer (struct bflb_device_s *dev, struct bflb_i2c_msg_s *msgs, int count)
	Start transferring i2c message. More...
void	bflb_i2c_int_mask (struct bflb_device_s *dev, uint32_t int_type, bool mask)
	Enable or disable i2c interrupt. More...
void	bflb_i2c_int_clear (struct bflb_device_s *dev, uint32_t int_clear)
	Clear i2c interrupt status. More...
uint32_t	bflb_i2c_get_intstatus (struct bflb_device_s *dev)
	Get i2c interrupt status. More...
int	bflb_i2c_feature_control (struct bflb_device_s *dev, int cmd, size_t arg)
	Control i2c feature. More...

Detailed Description

Macro Definition Documentation

I2C_M_DMA

#define I2C_M_DMA   0x0004 /* Enable dma mode */

Definition at line 47 of file bflb_i2c.h.

I2C_M_NOSTART

#define I2C_M_NOSTART   0x0080 /* Message should not begin with a START */

Definition at line 49 of file bflb_i2c.h.

I2C_M_NOSTOP

#define I2C_M_NOSTOP   0x0040 /* Message should not end with a STOP */

Definition at line 48 of file bflb_i2c.h.

I2C_M_READ

#define I2C_M_READ   0x0001 /* Read data, from slave to master */

Definition at line 45 of file bflb_i2c.h.

I2C_M_TEN

#define I2C_M_TEN   0x0002 /* Ten bit address */

Definition at line 46 of file bflb_i2c.h.

Function Documentation

bflb_i2c_deinit()

void bflb_i2c_deinit

(

struct bflb_device_s *

dev

)

Deinitialize i2c.

Parameters

[in]

dev

device handle

bflb_i2c_feature_control()

int bflb_i2c_feature_control	(	struct bflb_device_s *	dev,
		int	cmd,
		size_t	arg
	)

Control i2c feature.

Parameters

[in]	dev	device handle
[in]	cmd	feature command
[in]	arg	user data

Returns

A negated errno value on failure.

bflb_i2c_get_intstatus()

uint32_t bflb_i2c_get_intstatus

(

struct bflb_device_s *

dev

)

Get i2c interrupt status.

Parameters

[in]

dev

device handle

Returns

interrupt status value, use i2c interrupt status definition

bflb_i2c_init()

void bflb_i2c_init	(	struct bflb_device_s *	dev,
		uint32_t	frequency
	)

Initialize i2c.

Parameters

[in]	dev	device handle
[in]	frequency	i2c frequency, range from 305Hz to 400KHz

bflb_i2c_int_clear()

void bflb_i2c_int_clear	(	struct bflb_device_s *	dev,
		uint32_t	int_clear
	)

Clear i2c interrupt status.

Parameters

[in]	dev	device handle
[in]	int_clear	clear value, use i2c interrupt clear definition

bflb_i2c_int_mask()

void bflb_i2c_int_mask	(	struct bflb_device_s *	dev,
		uint32_t	int_type,
		bool	mask
	)

Enable or disable i2c interrupt.

Parameters

[in]	dev	device handle
[in]	int_type	interrupt type ,use i2c interrupt enable definition
[in]	mask	true means disable, false means enable

bflb_i2c_link_rxdma()

void bflb_i2c_link_rxdma	(	struct bflb_device_s *	dev,
		bool	enable
	)

Enable i2c rx dma.

Parameters

[in]	dev	device handle
[in]	enable	true means enable, otherwise disable.

bflb_i2c_link_txdma()

void bflb_i2c_link_txdma	(	struct bflb_device_s *	dev,
		bool	enable
	)

Enable i2c tx dma.

Parameters

[in]	dev	device handle
[in]	enable	true means enable, otherwise disable.

bflb_i2c_transfer()

int bflb_i2c_transfer	(	struct bflb_device_s *	dev,
		struct bflb_i2c_msg_s *	msgs,
		int	count
	)

Start transferring i2c message.

Parameters

[in]	dev	device handle
[in]	msgs	pointer to i2c message
[in]	count	message count

Returns

A negated errno value on failure.