I2C

[English]

I2C API Status

API

BK7237

BK7237_cp1

bk_i2c_driver_init()

Y

Y

bk_i2c_driver_deinit()

Y

Y

bk_i2c_init()

Y

Y

bk_i2c_deinit()

Y

Y

bk_i2c_master_write()

Y

Y

bk_i2c_master_read()

Y

Y

bk_i2c_slave_write()

Y

Y

bk_i2c_slave_read()

Y

Y

bk_i2c_memory_write()

Y

Y

bk_i2c_memory_read()

Y

Y

I2C UNIT Number

Capability

BK7237

BK7237_cp1

UNIT Number

3

3

I2C Pin and GPIO Map

SPI Pin

BK7237

BK7237_cp1

I2C0 SCL

20

20

I2C0 SDA

21

21

I2C1 SCL

42

42

I2C1 SDA

43

43

I2C2 SCL

0

0

I2C2 SDA

1

1

I2C API Reference

Header File

Functions

bk_err_t bk_i2c_driver_init(void)

Init the I2C driver.

This API init the resoure common:

  • Init I2C driver control memory

Attention

1. This API should be called before any other I2C APIs.

Returns

  • BK_OK: succeed

  • others: other errors.

bk_err_t bk_i2c_driver_deinit(void)

Deinit the I2C driver.

This API free all resource related to I2C and disable I2C.

Returns

  • BK_OK: succeed

  • others: other errors.

bk_err_t bk_i2c_init(i2c_id_t id, const i2c_config_t *cfg)

Init the I2C id.

This API init the I2C id:

  • Power up the I2C id

  • Configure the I2C id clock

  • Map the I2C id to dedicated GPIO port

  • Set the I2C parameters

  • Start the I2C id

Attention

Multifunction GPIO initialization affects other functions

Parameters
  • id – I2C id

  • config – I2C parameter settings

Returns

  • BK_OK: succeed

  • BK_ERR_NULL_PARAM: I2C config paramter is NULL

  • BK_ERR_I2C_NOT_INIT: I2C driver not init

  • others: other errors.

bk_err_t bk_i2c_deinit(i2c_id_t id)

Deinit the I2C id.

This API deinit the I2C id:

  • Stop the I2C id

  • Disable the I2C id interrupt

  • Power down the I2C id

Parameters

id – I2C id

Returns

  • BK_OK: succeed

  • others: other errors.

bk_err_t bk_i2c_master_write(i2c_id_t id, uint32_t dev_addr, const uint8_t *data, uint32_t size, uint32_t timeout_ms)

Write data to the I2C port from a given buffer and length, It shall only be called in I2C master mode.

Parameters
  • id – I2C id

  • dev_addr – slave device address

  • data – pointer to the buffer

  • size – data length to write

  • timeout_ms – timeout ms

Returns

  • BK_OK: succeed

  • BK_ERR_I2C_NOT_INIT: I2C driver not init

  • BK_ERR_I2C_INVALID_ID: I2C id number is invalid

  • BK_ERR_I2C_ID_NOT_INIT: I2C id not init

  • others: other errors.

bk_err_t bk_i2c_master_read(i2c_id_t id, uint32_t dev_addr, uint8_t *data, uint32_t size, uint32_t timeout_ms)

I2C read data from I2C buffer, It shall only be called in I2C master mode.

Parameters
  • id – I2C id

  • dev_addr – slave device address

  • data – pointer to the buffer

  • size – data length to read

  • timeout_ms – timeout ms

Returns

  • BK_OK: succeed

  • BK_ERR_I2C_NOT_INIT: I2C driver not init

  • BK_ERR_I2C_INVALID_ID: I2C id number is invalid

  • BK_ERR_I2C_ID_NOT_INIT: I2C id not init

  • others: other errors.

bk_err_t bk_i2c_slave_write(i2c_id_t id, const uint8_t *data, uint32_t size, uint32_t timeout_ms)

Write data to the I2C port from a given buffer and length, It shall only be called in I2C slave mode.

Parameters
  • id – I2C id

  • data – pointer to the buffer

  • size – data length to write

  • timeout_ms – timeout ms

Returns

  • BK_OK: succeed

  • BK_ERR_I2C_NOT_INIT: I2C driver not init

  • BK_ERR_I2C_INVALID_ID: I2C id number is invalid

  • BK_ERR_I2C_ID_NOT_INIT: I2C id not init

  • others: other errors.

bk_err_t bk_i2c_slave_read(i2c_id_t id, uint8_t *data, uint32_t size, uint32_t timeout_ms)

I2C read data from I2C buffer, It shall only be called in I2C slave mode.

Parameters
  • id – I2C id

  • dev_addr – slave device address

  • data – pointer to the buffer

  • size – data length to read

  • timeout_ms – timeout ms

Returns

  • BK_OK: succeed

  • BK_ERR_I2C_NOT_INIT: I2C driver not init

  • BK_ERR_I2C_INVALID_ID: I2C id number is invalid

  • BK_ERR_I2C_ID_NOT_INIT: I2C id not init

  • others: other errors.

bk_err_t bk_i2c_memory_write(i2c_id_t id, const i2c_mem_param_t *mem_param)

Write data to the specific memory address from a given buffer and length, It shall only be called in I2C master mode.

Parameters
  • id – I2C id

  • mem_param – memory parameter

Returns

  • BK_OK: succeed

  • BK_ERR_NULL_PARAM: I2C mem_param is NULL

  • BK_ERR_I2C_NOT_INIT: I2C driver not init

  • BK_ERR_I2C_INVALID_ID: I2C id number is invalid

  • BK_ERR_I2C_ID_NOT_INIT: I2C id not init

  • others: other errors.

bk_err_t bk_i2c_memory_read(i2c_id_t id, const i2c_mem_param_t *mem_param)

I2C read data from I2C specific memory address, It shall only be called in I2C master mode.

Parameters
  • id – I2C id

  • mem_param – memory parameter

Returns

  • BK_OK: succeed

  • BK_ERR_NULL_PARAM: I2C mem_param is NULL

  • BK_ERR_I2C_NOT_INIT: I2C driver not init

  • BK_ERR_I2C_INVALID_ID: I2C id number is invalid

  • BK_ERR_I2C_ID_NOT_INIT: I2C id not init

  • others: other errors.

bk_err_t bk_i2c_set_baud_rate(i2c_id_t id, uint32_t baud_rate)

I2C set baud rate.

Parameters
  • id – I2C id

  • baud_rate – baud rate

Returns

  • BK_OK: succeed

  • BK_ERR_I2C_NOT_INIT: I2C driver not init

  • BK_ERR_I2C_INVALID_ID: I2C id number is invalid

  • BK_ERR_I2C_ID_NOT_INIT: I2C id not init

  • others: other errors.

bk_err_t bk_i2c_set_slave_address(i2c_id_t id, uint16_t slave_addr)

Set slave address when current role is i2c slave.

Parameters
  • id – I2C id

  • slave_addr – slave address

Returns

  • BK_OK: succeed

  • BK_ERR_I2C_NOT_INIT: I2C driver not init

  • others: other errors.

bk_err_t bk_i2c_enable_interrupt(i2c_id_t id)

Enable I2C interrupt.

Parameters

id – I2C id

Returns

  • BK_OK: succeed

  • others: other errors.

bk_err_t bk_i2c_disable_interrupt(i2c_id_t id)

Disable I2C interrupt.

Parameters

id – I2C id

Returns

  • BK_OK: succeed

  • others: other errors.

bool bk_i2c_is_bus_busy(i2c_id_t id)

Check if I2C is busy.

Parameters

id – I2C id

Returns

true: busy, false: not busy

uint32_t bk_i2c_get_cur_action(i2c_id_t id)

Get i2c current action, such as start,stop,send write_addr.

Parameters

id – I2C id

Returns

i2c action

void bk_i2c_timer_callback(int id, void *myTimer)

bk_i2c_timer_callback

This API set timer call back

Returns

uint8_t bk_i2c_get_busstate(int id)

bk_i2c_get_busstate

This API get bus status idle or busy

Returns

  • 1: idle

  • 0: busy.

uint8_t bk_i2c_get_transstate(int id)

bk_i2c_get_transstate

This API get bus status idle or busy

Returns

  • 1: ok

  • 0: fail.

I2C API Typedefs

Header File

Structures

struct i2c_mem_param_t

Public Members

uint32_t dev_addr

I2C slave device address

uint32_t mem_addr

I2C slave device memerory address

i2c_mem_addr_size_t mem_addr_size

I2C slave device memerory address size

uint8_t *data

I2C data pointer

uint32_t data_size

I2C data size

uint32_t timeout_ms

I2C timeout ms

Macros

BK_ERR_I2C_NOT_INIT

I2C driver not init

BK_ERR_I2C_ID_NOT_INIT

I2C id not init

BK_ERR_I2C_SM_BUS_BUSY

I2C bus busy

BK_ERR_I2C_ACK_TIMEOUT

I2C receive ack timeout

BK_ERR_I2C_CHECK_DEFCONFIG

I2C please check defconfig

BK_ERR_I2C_SCL_TIMEOUT

I2C SCL timeout

Type Definitions

typedef void (*i2c_isr_t)(i2c_id_t id, void *param)

i2c interrupt service routine

Enumerations

enum i2c_work_mode_t

Values:

enumerator I2C_MASTER_WRITE

I2C master write

enumerator I2C_MASTER_READ

I2C master read

enumerator I2C_SLAVE_WRITE

I2C slave write

enumerator I2C_SLAVE_READ

I2C slave read

Header File

Structures

struct i2c_config_t

Public Members

uint32_t baud_rate

i2c clock rate

i2c_addr_mode_t addr_mode

i2c address mode

uint16_t slave_addr

i2c address for slave mode

Macros

I2C_BAUD_RATE_50KHZ
I2C_BAUD_RATE_100KHZ
I2C_BAUD_RATE_200KHZ
I2C_BAUD_RATE_400KHZ
I2C_DEFAULT_BAUD_RATE

Type Definitions

typedef uint8_t i2c_unit_t

i2c uint id

Enumerations

enum i2c_id_t

Values:

enumerator I2C_ID_0

i2c id 0

enumerator I2C_ID_MAX

i2c id max

enum i2c_addr_mode_t

Values:

enumerator I2C_ADDR_MODE_7BIT

i2c address mode 7bit

enumerator I2C_ADDR_MODE_10BIT

i2c address mode 10bit

enum i2c_fifo_int_level_t

Values:

enumerator I2C_FIFO_INT_LEVEL_1

i2c fifo int level 1

enumerator I2C_FIFO_INT_LEVEL_4

i2c fifo int level 4

enumerator I2C_FIFO_INT_LEVEL_8

i2c fifo int level 8

enumerator I2C_FIFO_INT_LEVEL_12

i2c fifo int level 12

enum i2c_mem_addr_size_t

Values:

enumerator I2C_MEM_ADDR_SIZE_8BIT

i2c memory address size 8bit

enumerator I2C_MEM_ADDR_SIZE_16BIT

i2c memory address size 16bit