I2C Interface . More...

Data Structures
struct	i2c_dt_spec
	Complete I2C DT information. More...

struct	i2c_msg
	One I2C Message. More...

struct	i2c_target_callbacks
	Structure providing callbacks to be implemented for devices that supports the I2C target API. More...

struct	i2c_target_config
	Structure describing a device that supports the I2C target API. More...

struct	i2c_device_state
	I2C specific device state which allows for i2c device class specific additions. More...

Macros
#define	I2C_SPEED_STANDARD (0x1U)
	I2C Standard Speed: 100 kHz.

#define	I2C_SPEED_FAST (0x2U)
	I2C Fast Speed: 400 kHz.

#define	I2C_SPEED_FAST_PLUS (0x3U)
	I2C Fast Plus Speed: 1 MHz.

#define	I2C_SPEED_HIGH (0x4U)
	I2C High Speed: 3.4 MHz.

#define	I2C_SPEED_ULTRA (0x5U)
	I2C Ultra Fast Speed: 5 MHz.

#define	I2C_SPEED_DT (0x7U)
	Device Tree specified speed.

#define	I2C_SPEED_SHIFT (1U)

#define	I2C_SPEED_SET(speed)

#define	I2C_SPEED_MASK (0x7U << I2C_SPEED_SHIFT) /* 3 bits */

#define	I2C_SPEED_GET(cfg)

#define	I2C_ADDR_10_BITS BIT(0)
	Use 10-bit addressing.

#define	I2C_MODE_CONTROLLER BIT(4)
	Peripheral to act as Controller.

#define	I2C_DT_SPEC_GET_ON_I3C(node_id)
	Structure initializer for i2c_dt_spec from devicetree (on I3C bus)

#define	I2C_DT_SPEC_GET_ON_I2C(node_id)
	Structure initializer for i2c_dt_spec from devicetree (on I2C bus)

#define	I2C_DT_SPEC_GET(node_id)
	Structure initializer for i2c_dt_spec from devicetree.

#define	I2C_DT_SPEC_INST_GET(inst)
	Structure initializer for i2c_dt_spec from devicetree instance.

#define	I2C_MSG_WRITE (0U << 0U)
	Write message to I2C bus.

#define	I2C_MSG_READ BIT(0)
	Read message from I2C bus.

#define	I2C_MSG_STOP BIT(1)
	Send STOP after this message.

#define	I2C_MSG_RESTART BIT(2)
	RESTART I2C transaction for this message.

#define	I2C_MSG_ADDR_10_BITS BIT(3)
	Use 10-bit addressing for this message.

#define	I2C_TARGET_FLAGS_ADDR_10_BITS BIT(0)
	Target device responds to 10-bit addressing.

#define	I2C_DEVICE_DT_DEFINE(node_id, init_fn, pm, data, config, level, prio, api, ...)
	Like DEVICE_DT_DEFINE() with I2C specifics.

#define	I2C_DEVICE_DT_INST_DEFINE(inst, ...)
	Like I2C_DEVICE_DT_DEFINE() for an instance of a DT_DRV_COMPAT compatible.

#define	I2C_DT_IODEV_DEFINE(name, node_id)
	Define an iodev for a given dt node on the bus.

#define	I2C_IODEV_DEFINE(name, _bus, _addr)
	Define an iodev for a given i2c device on a bus.

Typedefs
typedef void(*	i2c_callback_t) (const struct device dev, int result, void data)
	I2C callback for asynchronous transfer requests.

typedef int(*	i2c_target_write_requested_cb_t) (struct i2c_target_config *config)
	Function called when a write to the device is initiated.

typedef int(*	i2c_target_write_received_cb_t) (struct i2c_target_config *config, uint8_t val)
	Function called when a write to the device is continued.

typedef int(*	i2c_target_read_requested_cb_t) (struct i2c_target_config config, uint8_t val)
	Function called when a read from the device is initiated.

typedef int(*	i2c_target_read_processed_cb_t) (struct i2c_target_config config, uint8_t val)
	Function called when a read from the device is continued.

typedef int(*	i2c_target_stop_cb_t) (struct i2c_target_config *config)
	Function called when a stop condition is observed after a start condition addressed to a particular device.

Functions
static bool	i2c_is_ready_dt (const struct i2c_dt_spec *spec)
	Validate that I2C bus is ready.

static bool	i2c_is_read_op (const struct i2c_msg *msg)
	Check if the current message is a read operation.

static bool	i2c_is_stop_op (const struct i2c_msg *msg)
	Check if the current message includes a stop.

void	i2c_dump_msgs_rw (const struct device dev, const struct i2c_msg msgs, uint8_t num_msgs, uint16_t addr, bool dump_read)
	Dump out an I2C message.

static void	i2c_dump_msgs (const struct device dev, const struct i2c_msg msgs, uint8_t num_msgs, uint16_t addr)
	Dump out an I2C message, before it is executed.

static void	i2c_xfer_stats (const struct device dev, struct i2c_msg msgs, uint8_t num_msgs)
	Updates the i2c stats for i2c transfers.

int	i2c_configure (const struct device *dev, uint32_t dev_config)
	Configure operation of a host controller.

int	i2c_get_config (const struct device dev, uint32_t dev_config)
	Get configuration of a host controller.

int	i2c_transfer (const struct device dev, struct i2c_msg msgs, uint8_t num_msgs, uint16_t addr)
	Perform data transfer to another I2C device in controller mode.

static int	i2c_transfer_cb (const struct device dev, struct i2c_msg msgs, uint8_t num_msgs, uint16_t addr, i2c_callback_t cb, void *userdata)
	Perform data transfer to another I2C device in controller mode.

static int	i2c_transfer_cb_dt (const struct i2c_dt_spec spec, struct i2c_msg msgs, uint8_t num_msgs, i2c_callback_t cb, void *userdata)
	Perform data transfer to another I2C device in master mode asynchronously.

static int	i2c_write_read_cb (const struct device dev, struct i2c_msg msgs, uint8_t num_msgs, uint16_t addr, const void write_buf, size_t num_write, void read_buf, size_t num_read, i2c_callback_t cb, void *userdata)
	Write then read data from an I2C device asynchronously.

static int	i2c_write_read_cb_dt (const struct i2c_dt_spec spec, struct i2c_msg msgs, uint8_t num_msgs, const void write_buf, size_t num_write, void read_buf, size_t num_read, i2c_callback_t cb, void *userdata)
	Write then read data from an I2C device asynchronously.

static int	i2c_transfer_signal (const struct device dev, struct i2c_msg msgs, uint8_t num_msgs, uint16_t addr, struct k_poll_signal *sig)
	Perform data transfer to another I2C device in controller mode.

void	i2c_iodev_submit_fallback (const struct device dev, struct rtio_iodev_sqe iodev_sqe)
	Fallback submit implementation.

static void	i2c_iodev_submit (struct rtio_iodev_sqe *iodev_sqe)
	Submit request(s) to an I2C device with RTIO.

struct rtio_sqe *	i2c_rtio_copy (struct rtio r, struct rtio_iodev iodev, const struct i2c_msg *msgs, uint8_t num_msgs)
	Copy the i2c_msgs into a set of RTIO requests.

static int	i2c_transfer_dt (const struct i2c_dt_spec spec, struct i2c_msg msgs, uint8_t num_msgs)
	Perform data transfer to another I2C device in controller mode.

int	i2c_recover_bus (const struct device *dev)
	Recover the I2C bus.

static int	i2c_target_register (const struct device dev, struct i2c_target_config cfg)
	Registers the provided config as Target device of a controller.

static int	i2c_target_unregister (const struct device dev, struct i2c_target_config cfg)
	Unregisters the provided config as Target device.

int	i2c_target_driver_register (const struct device *dev)
	Instructs the I2C Target device to register itself to the I2C Controller.

int	i2c_target_driver_unregister (const struct device *dev)
	Instructs the I2C Target device to unregister itself from the I2C Controller.

static int	i2c_write (const struct device dev, const uint8_t buf, uint32_t num_bytes, uint16_t addr)
	Write a set amount of data to an I2C device.

static int	i2c_write_dt (const struct i2c_dt_spec spec, const uint8_t buf, uint32_t num_bytes)
	Write a set amount of data to an I2C device.

static int	i2c_read (const struct device dev, uint8_t buf, uint32_t num_bytes, uint16_t addr)
	Read a set amount of data from an I2C device.

static int	i2c_read_dt (const struct i2c_dt_spec spec, uint8_t buf, uint32_t num_bytes)
	Read a set amount of data from an I2C device.

static int	i2c_write_read (const struct device dev, uint16_t addr, const void write_buf, size_t num_write, void *read_buf, size_t num_read)
	Write then read data from an I2C device.

static int	i2c_write_read_dt (const struct i2c_dt_spec spec, const void write_buf, size_t num_write, void *read_buf, size_t num_read)
	Write then read data from an I2C device.

static int	i2c_burst_read (const struct device dev, uint16_t dev_addr, uint8_t start_addr, uint8_t buf, uint32_t num_bytes)
	Read multiple bytes from an internal address of an I2C device.

static int	i2c_burst_read_dt (const struct i2c_dt_spec spec, uint8_t start_addr, uint8_t buf, uint32_t num_bytes)
	Read multiple bytes from an internal address of an I2C device.

static int	i2c_burst_write (const struct device dev, uint16_t dev_addr, uint8_t start_addr, const uint8_t buf, uint32_t num_bytes)
	Write multiple bytes to an internal address of an I2C device.

static int	i2c_burst_write_dt (const struct i2c_dt_spec spec, uint8_t start_addr, const uint8_t buf, uint32_t num_bytes)
	Write multiple bytes to an internal address of an I2C device.

static int	i2c_reg_read_byte (const struct device dev, uint16_t dev_addr, uint8_t reg_addr, uint8_t value)
	Read internal register of an I2C device.

static int	i2c_reg_read_byte_dt (const struct i2c_dt_spec spec, uint8_t reg_addr, uint8_t value)
	Read internal register of an I2C device.

static int	i2c_reg_write_byte (const struct device *dev, uint16_t dev_addr, uint8_t reg_addr, uint8_t value)
	Write internal register of an I2C device.

static int	i2c_reg_write_byte_dt (const struct i2c_dt_spec *spec, uint8_t reg_addr, uint8_t value)
	Write internal register of an I2C device.

static int	i2c_reg_update_byte (const struct device *dev, uint8_t dev_addr, uint8_t reg_addr, uint8_t mask, uint8_t value)
	Update internal register of an I2C device.

static int	i2c_reg_update_byte_dt (const struct i2c_dt_spec *spec, uint8_t reg_addr, uint8_t mask, uint8_t value)
	Update internal register of an I2C device.

Variables
const struct rtio_iodev_api	i2c_iodev_api

Detailed Description

I2C Interface .

Since: 1.0

Version: 1.0.0

Macro Definition Documentation

◆ I2C_ADDR_10_BITS

#define I2C_ADDR_10_BITS BIT(0)

#include <zephyr/drivers/i2c.h>

Use 10-bit addressing.

DEPRECATED - Use I2C_MSG_ADDR_10_BITS instead.

◆ I2C_DEVICE_DT_DEFINE

#define I2C_DEVICE_DT_DEFINE	(	node_id,
		init_fn,
		pm,
		data,
		config,
		level,
		prio,
		api,
		... )

#include <zephyr/drivers/i2c.h>

Value:

        Z_I2C_DEVICE_STATE_DEFINE(Z_DEVICE_DT_DEV_ID(node_id));         \
        Z_I2C_INIT_FN(Z_DEVICE_DT_DEV_ID(node_id), init_fn)             \
        Z_DEVICE_DEFINE(node_id, Z_DEVICE_DT_DEV_ID(node_id),           \
                        DEVICE_DT_NAME(node_id),                        \
                        &UTIL_CAT(Z_DEVICE_DT_DEV_ID(node_id), _init),  \
                        pm, data, config, level, prio, api,     \
                        &(Z_DEVICE_STATE_NAME(Z_DEVICE_DT_DEV_ID(node_id)).devstate), \
                        __VA_ARGS__)

Like DEVICE_DT_DEFINE() with I2C specifics.

Defines a device which implements the I2C API. May generate a custom device_state container struct and init_fn wrapper when needed depending on I2C CONFIG_I2C_STATS.

Parameters

node_id	The devicetree node identifier.
init_fn	Name of the init function of the driver. Can be `NULL`.
pm	PM device resources reference (NULL if device does not use PM).
data	Pointer to the device's private data.
config	The address to the structure containing the configuration information for this instance of the driver.
level	The initialization level. See SYS_INIT() for details.
prio	Priority within the selected initialization level. See SYS_INIT() for details.
api	Provides an initial pointer to the API function struct used by the driver. Can be NULL.

◆ I2C_DEVICE_DT_INST_DEFINE

#define I2C_DEVICE_DT_INST_DEFINE	(		inst,
			... )

#include <zephyr/drivers/i2c.h>

Value:

I2C_DEVICE_DT_DEFINE(DT_DRV_INST(inst), __VA_ARGS__)

DT_DRV_INST

#define DT_DRV_INST(inst)

Node identifier for an instance of a DT_DRV_COMPAT compatible.

Definition devicetree.h:3809

I2C_DEVICE_DT_DEFINE

#define I2C_DEVICE_DT_DEFINE(node_id, init_fn, pm, data, config, level, prio, api,...)

Like DEVICE_DT_DEFINE() with I2C specifics.

Definition i2c.h:664

Like I2C_DEVICE_DT_DEFINE() for an instance of a DT_DRV_COMPAT compatible.

Parameters

inst	instance number. This is replaced by `DT_DRV_COMPAT(inst)` in the call to I2C_DEVICE_DT_DEFINE().
...	other parameters as expected by I2C_DEVICE_DT_DEFINE().

◆ I2C_DT_IODEV_DEFINE

#define I2C_DT_IODEV_DEFINE	(		name,
			node_id )

#include <zephyr/drivers/i2c.h>

Value:

        const struct i2c_dt_spec _i2c_dt_spec_##name =                          \
                I2C_DT_SPEC_GET(node_id);                                       \
        RTIO_IODEV_DEFINE(name, &i2c_iodev_api, (void *)&_i2c_dt_spec_##name)

Define an iodev for a given dt node on the bus.

These do not need to be shared globally but doing so will save a small amount of memory.

Parameters

name	Symbolic name of the iodev to define
node_id	Devicetree node identifier

◆ I2C_DT_SPEC_GET

#define I2C_DT_SPEC_GET ( node_id )

#include <zephyr/drivers/i2c.h>

Value:

        {                                                               \
                COND_CODE_1(DT_ON_BUS(node_id, i3c),                    \
                            (I2C_DT_SPEC_GET_ON_I3C(node_id)),          \
                            (I2C_DT_SPEC_GET_ON_I2C(node_id)))          \
        }

Structure initializer for i2c_dt_spec from devicetree.

This helper macro expands to a static initializer for a struct i2c_dt_spec by reading the relevant bus and address data from the devicetree.

Parameters

node_id Devicetree node identifier for the I2C device whose struct i2c_dt_spec to create an initializer for

◆ I2C_DT_SPEC_GET_ON_I2C

#define I2C_DT_SPEC_GET_ON_I2C ( node_id )

#include <zephyr/drivers/i2c.h>

Value:

.bus = DEVICE_DT_GET(DT_BUS(node_id)), \

.addr = DT_REG_ADDR(node_id)

DEVICE_DT_GET

#define DEVICE_DT_GET(node_id)

Get a device reference from a devicetree node identifier.

Definition device.h:255

DT_BUS

#define DT_BUS(node_id)

Node's bus controller.

Definition devicetree.h:3761

DT_REG_ADDR

#define DT_REG_ADDR(node_id)

Get a node's (only) register block address.

Definition devicetree.h:2440

Structure initializer for i2c_dt_spec from devicetree (on I2C bus)

This helper macro expands to a static initializer for a struct i2c_dt_spec by reading the relevant bus and address data from the devicetree.

Parameters

node_id Devicetree node identifier for the I2C device whose struct i2c_dt_spec to create an initializer for

◆ I2C_DT_SPEC_GET_ON_I3C

#define I2C_DT_SPEC_GET_ON_I3C ( node_id )

#include <zephyr/drivers/i2c.h>

Value:

.bus = DEVICE_DT_GET(DT_BUS(node_id)), \

.addr = DT_PROP_BY_IDX(node_id, reg, 0)

DT_PROP_BY_IDX

#define DT_PROP_BY_IDX(node_id, prop, idx)

Get the value at index idx in an array type property.

Definition devicetree.h:898

Structure initializer for i2c_dt_spec from devicetree (on I3C bus)

This helper macro expands to a static initializer for a struct i2c_dt_spec by reading the relevant bus and address data from the devicetree.

Parameters

node_id Devicetree node identifier for the I2C device whose struct i2c_dt_spec to create an initializer for

◆ I2C_DT_SPEC_INST_GET

#define I2C_DT_SPEC_INST_GET ( inst )

#include <zephyr/drivers/i2c.h>

Value:

I2C_DT_SPEC_GET(DT_DRV_INST(inst))

I2C_DT_SPEC_GET

#define I2C_DT_SPEC_GET(node_id)

Structure initializer for i2c_dt_spec from devicetree.

Definition i2c.h:120

Structure initializer for i2c_dt_spec from devicetree instance.

This is equivalent to I2C_DT_SPEC_GET(DT_DRV_INST(inst)).

Parameters

inst	Devicetree instance number

◆ I2C_IODEV_DEFINE

#define I2C_IODEV_DEFINE	(	name,
		_bus,
		_addr )

#include <zephyr/drivers/i2c.h>

Value:

        const struct i2c_dt_spec _i2c_dt_spec_##name = {                        \
                .bus = DEVICE_DT_GET(_bus),                                     \
                .addr = _addr,                                                  \
        };                                                                      \
        RTIO_IODEV_DEFINE(name, &i2c_iodev_api, (void *)&_i2c_dt_spec_##name)

Define an iodev for a given i2c device on a bus.

These do not need to be shared globally but doing so will save a small amount of memory.

Parameters

name	Symbolic name of the iodev to define
_bus	Node ID for I2C bus
_addr	I2C target address

◆ I2C_MODE_CONTROLLER

#define I2C_MODE_CONTROLLER BIT(4)

#include <zephyr/drivers/i2c.h>

Peripheral to act as Controller.

◆ I2C_MSG_ADDR_10_BITS

#define I2C_MSG_ADDR_10_BITS BIT(3)

#include <zephyr/drivers/i2c.h>

Use 10-bit addressing for this message.

Note: Not all SoC I2C implementations support this feature.

◆ I2C_MSG_READ

#define I2C_MSG_READ BIT(0)

#include <zephyr/drivers/i2c.h>

Read message from I2C bus.

◆ I2C_MSG_RESTART

#define I2C_MSG_RESTART BIT(2)

#include <zephyr/drivers/i2c.h>

RESTART I2C transaction for this message.

Note: Not all I2C drivers have or require explicit support for this feature. Some drivers require this be present on a read message that follows a write, or vice-versa. Some drivers will merge adjacent fragments into a single transaction using this flag; some will not.

◆ I2C_MSG_STOP

#define I2C_MSG_STOP BIT(1)

#include <zephyr/drivers/i2c.h>

Send STOP after this message.

◆ I2C_MSG_WRITE

#define I2C_MSG_WRITE (0U << 0U)

#include <zephyr/drivers/i2c.h>

Write message to I2C bus.

◆ I2C_SPEED_DT

#define I2C_SPEED_DT (0x7U)

#include <zephyr/drivers/i2c.h>

Device Tree specified speed.

◆ I2C_SPEED_FAST

#define I2C_SPEED_FAST (0x2U)

#include <zephyr/drivers/i2c.h>

I2C Fast Speed: 400 kHz.

◆ I2C_SPEED_FAST_PLUS

#define I2C_SPEED_FAST_PLUS (0x3U)

#include <zephyr/drivers/i2c.h>

I2C Fast Plus Speed: 1 MHz.

◆ I2C_SPEED_GET

#define I2C_SPEED_GET ( cfg )

#include <zephyr/drivers/i2c.h>

Value:

(((cfg) & I2C_SPEED_MASK) \

>> I2C_SPEED_SHIFT)

I2C_SPEED_SHIFT

#define I2C_SPEED_SHIFT

Definition i2c.h:58

I2C_SPEED_MASK

#define I2C_SPEED_MASK

Definition i2c.h:61

◆ I2C_SPEED_HIGH

#define I2C_SPEED_HIGH (0x4U)

#include <zephyr/drivers/i2c.h>

I2C High Speed: 3.4 MHz.

◆ I2C_SPEED_MASK

#define I2C_SPEED_MASK (0x7U << I2C_SPEED_SHIFT) /* 3 bits */

#include <zephyr/drivers/i2c.h>

◆ I2C_SPEED_SET

#define I2C_SPEED_SET ( speed )

#include <zephyr/drivers/i2c.h>

Value:

(((speed) << I2C_SPEED_SHIFT) \

& I2C_SPEED_MASK)

◆ I2C_SPEED_SHIFT

#define I2C_SPEED_SHIFT (1U)

#include <zephyr/drivers/i2c.h>

◆ I2C_SPEED_STANDARD

#define I2C_SPEED_STANDARD (0x1U)

#include <zephyr/drivers/i2c.h>

I2C Standard Speed: 100 kHz.

◆ I2C_SPEED_ULTRA

#define I2C_SPEED_ULTRA (0x5U)

#include <zephyr/drivers/i2c.h>

I2C Ultra Fast Speed: 5 MHz.

◆ I2C_TARGET_FLAGS_ADDR_10_BITS

#define I2C_TARGET_FLAGS_ADDR_10_BITS BIT(0)

#include <zephyr/drivers/i2c.h>

Target device responds to 10-bit addressing.

Typedef Documentation

◆ i2c_callback_t

typedef void(* i2c_callback_t) (const struct device *dev, int result, void *data)

#include <zephyr/drivers/i2c.h>

I2C callback for asynchronous transfer requests.

Parameters

dev	I2C device which is notifying of transfer completion or error
result	Result code of the transfer request. 0 is success, -errno for failure.
data	Transfer requester supplied data which is passed along to the callback.

◆ i2c_target_read_processed_cb_t

typedef int(* i2c_target_read_processed_cb_t) (struct i2c_target_config *config, uint8_t *val)

#include <zephyr/drivers/i2c.h>

Function called when a read from the device is continued.

This function is invoked by the controller when the bus is ready to provide additional data for a read operation from the address associated with the device device.

The value returned in *val will be transmitted. A success return shall cause the controller to react to additional read operations. An error return shall cause the controller to ignore bus operations until a new start condition is received.

Parameters

config	the configuration structure associated with the device to which the operation is addressed.
val	pointer to storage for the next byte of data to return for the read request.

Returns: 0 if data has been provided, or a negative error code.

◆ i2c_target_read_requested_cb_t

typedef int(* i2c_target_read_requested_cb_t) (struct i2c_target_config *config, uint8_t *val)

#include <zephyr/drivers/i2c.h>

Function called when a read from the device is initiated.

This function is invoked by the controller when the bus completes a start condition for a read operation from the address associated with a particular device.

The value returned in *val will be transmitted. A success return shall cause the controller to react to additional read operations. An error return shall cause the controller to ignore bus operations until a new start condition is received.

Parameters

config	the configuration structure associated with the device to which the operation is addressed.
val	pointer to storage for the first byte of data to return for the read request.

Returns: 0 if more data can be requested, or a negative error code.

◆ i2c_target_stop_cb_t

typedef int(* i2c_target_stop_cb_t) (struct i2c_target_config *config)

#include <zephyr/drivers/i2c.h>

Function called when a stop condition is observed after a start condition addressed to a particular device.

This function is invoked by the controller when the bus is ready to provide additional data for a read operation from the address associated with the device device. After the function returns the controller shall enter a state where it is ready to react to new start conditions.

Parameters

config the configuration structure associated with the device to which the operation is addressed.

Returns: Ignored.

◆ i2c_target_write_received_cb_t

typedef int(* i2c_target_write_received_cb_t) (struct i2c_target_config *config, uint8_t val)

#include <zephyr/drivers/i2c.h>

Function called when a write to the device is continued.

This function is invoked by the controller when it completes reception of a byte of data in an ongoing write operation to the device.

A success return shall cause the controller to ACK the next byte received. An error return shall cause the controller to NACK the next byte received.

Parameters

config	the configuration structure associated with the device to which the operation is addressed.
val	the byte received by the controller.

Returns: 0 if more data can be accepted, or a negative error code.

◆ i2c_target_write_requested_cb_t

typedef int(* i2c_target_write_requested_cb_t) (struct i2c_target_config *config)

#include <zephyr/drivers/i2c.h>

Function called when a write to the device is initiated.

This function is invoked by the controller when the bus completes a start condition for a write operation to the address associated with a particular device.

A success return shall cause the controller to ACK the next byte received. An error return shall cause the controller to NACK the next byte received.

Parameters

config the configuration structure associated with the device to which the operation is addressed.

Returns: 0 if the write is accepted, or a negative error code.

Function Documentation

◆ i2c_burst_read()

static int i2c_burst_read	(	const struct device *	dev,
		uint16_t	dev_addr,
		uint8_t	start_addr,
		uint8_t *	buf,
		uint32_t	num_bytes )

inlinestatic

#include <zephyr/drivers/i2c.h>

Read multiple bytes from an internal address of an I2C device.

This routine reads multiple bytes from an internal address of an I2C device synchronously.

Instances of this may be replaced by i2c_write_read().

Parameters

dev	Pointer to the device structure for an I2C controller driver configured in controller mode.
dev_addr	Address of the I2C device for reading.
start_addr	Internal address from which the data is being read.
buf	Memory pool that stores the retrieved data.
num_bytes	Number of bytes being read.

Return values

0	If successful.
-EIO	General input / output error.

◆ i2c_burst_read_dt()

static int i2c_burst_read_dt	(	const struct i2c_dt_spec *	spec,
		uint8_t	start_addr,
		uint8_t *	buf,
		uint32_t	num_bytes )

inlinestatic

#include <zephyr/drivers/i2c.h>

Read multiple bytes from an internal address of an I2C device.

This is equivalent to:

i2c_burst_read(spec->bus, spec->addr, start_addr, buf, num_bytes);

Parameters

spec	I2C specification from devicetree.
start_addr	Internal address from which the data is being read.
buf	Memory pool that stores the retrieved data.
num_bytes	Number of bytes to read.

Returns: a value from i2c_burst_read()

◆ i2c_burst_write()

static int i2c_burst_write	(	const struct device *	dev,
		uint16_t	dev_addr,
		uint8_t	start_addr,
		const uint8_t *	buf,
		uint32_t	num_bytes )

inlinestatic

#include <zephyr/drivers/i2c.h>

Write multiple bytes to an internal address of an I2C device.

This routine writes multiple bytes to an internal address of an I2C device synchronously.

Warning: The combined write synthesized by this API may not be supported on all I2C devices. Uses of this API may be made more portable by replacing them with calls to i2c_write() passing a buffer containing the combined address and data.

Parameters

dev	Pointer to the device structure for an I2C controller driver configured in controller mode.
dev_addr	Address of the I2C device for writing.
start_addr	Internal address to which the data is being written.
buf	Memory pool from which the data is transferred.
num_bytes	Number of bytes being written.

Return values

0	If successful.
-EIO	General input / output error.

◆ i2c_burst_write_dt()

static int i2c_burst_write_dt	(	const struct i2c_dt_spec *	spec,
		uint8_t	start_addr,
		const uint8_t *	buf,
		uint32_t	num_bytes )

inlinestatic

#include <zephyr/drivers/i2c.h>

Write multiple bytes to an internal address of an I2C device.

This is equivalent to:

i2c_burst_write(spec->bus, spec->addr, start_addr, buf, num_bytes);

Parameters

spec	I2C specification from devicetree.
start_addr	Internal address to which the data is being written.
buf	Memory pool from which the data is transferred.
num_bytes	Number of bytes being written.

Returns: a value from i2c_burst_write()

◆ i2c_configure()

int i2c_configure	(	const struct device *	dev,
		uint32_t	dev_config )

#include <zephyr/drivers/i2c.h>

Configure operation of a host controller.

Parameters

dev	Pointer to the device structure for the driver instance.
dev_config	Bit-packed 32-bit value to the device runtime configuration for the I2C controller.

Return values

0	If successful.
-EIO	General input / output error, failed to configure device.

◆ i2c_dump_msgs()

static void i2c_dump_msgs	(	const struct device *	dev,
		const struct i2c_msg *	msgs,
		uint8_t	num_msgs,
		uint16_t	addr )

inlinestatic

#include <zephyr/drivers/i2c.h>

Dump out an I2C message, before it is executed.

This is equivalent to:

i2c_dump_msgs_rw(dev, msgs, num_msgs, addr, false);

The read messages' data isn't dumped.

Parameters

dev	Target for the messages being sent. Its name will be printed in the log.
msgs	Array of messages to dump.
num_msgs	Number of messages to dump.
addr	Address of the I2C target device.

◆ i2c_dump_msgs_rw()

void i2c_dump_msgs_rw	(	const struct device *	dev,
		const struct i2c_msg *	msgs,
		uint8_t	num_msgs,
		uint16_t	addr,
		bool	dump_read )

#include <zephyr/drivers/i2c.h>

Dump out an I2C message.

Dumps out a list of I2C messages. For any that are writes (W), the data is displayed in hex. Setting dump_read will dump the data for read messages too, which only makes sense when called after the messages have been processed.

It looks something like this (with name "testing"):

D: I2C msg: testing, addr=56
D:    W len=01: 06
D:    W len=0e:
D: contents:
D: 00 01 02 03 04 05 06 07 |........
D: 08 09 0a 0b 0c 0d       |......
D:    W len=01: 0f
D:    R len=01: 6c

Parameters

dev	Target for the messages being sent. Its name will be printed in the log.
msgs	Array of messages to dump.
num_msgs	Number of messages to dump.
addr	Address of the I2C target device.
dump_read	Dump data from I2C reads, otherwise only writes have data dumped.

◆ i2c_get_config()

int i2c_get_config	(	const struct device *	dev,
		uint32_t *	dev_config )

#include <zephyr/drivers/i2c.h>

Get configuration of a host controller.

This routine provides a way to get current configuration. It is allowed to call the function before i2c_configure, because some I2C ports can be configured during init process. However, if the I2C port is not configured, i2c_get_config returns an error.

i2c_get_config can return cached config or probe hardware, but it has to be up to date with current configuration.

Parameters

dev	Pointer to the device structure for the driver instance.
dev_config	Pointer to return bit-packed 32-bit value of the I2C controller configuration.

Return values

0	If successful.
-EIO	General input / output error.
-ERANGE	Configured I2C frequency is invalid.
-ENOSYS	If get config is not implemented

◆ i2c_iodev_submit()

static void i2c_iodev_submit ( struct rtio_iodev_sqe * iodev_sqe )

inlinestatic

#include <zephyr/drivers/i2c.h>

Submit request(s) to an I2C device with RTIO.

Parameters

iodev_sqe Prepared submissions queue entry connected to an iodev defined by I2C_DT_IODEV_DEFINE.

◆ i2c_iodev_submit_fallback()

void i2c_iodev_submit_fallback	(	const struct device *	dev,
		struct rtio_iodev_sqe *	iodev_sqe )

#include <zephyr/drivers/i2c.h>

Fallback submit implementation.

This implementation will schedule a blocking I2C transaction on the bus via the RTIO work queue. It is only used if the I2C driver did not implement the iodev_submit function.

Parameters

dev	Pointer to the device structure for an I2C controller driver.
iodev_sqe	Prepared submissions queue entry connected to an iodev defined by I2C_DT_IODEV_DEFINE.

◆ i2c_is_read_op()

static bool i2c_is_read_op ( const struct i2c_msg * msg )

inlinestatic

#include <zephyr/drivers/i2c.h>

Check if the current message is a read operation.

Parameters

msg	The message to check

Returns: true if the I2C message is a read operation; false if the I2C message is a write operation

◆ i2c_is_ready_dt()

static bool i2c_is_ready_dt ( const struct i2c_dt_spec * spec )

inlinestatic

#include <zephyr/drivers/i2c.h>

Validate that I2C bus is ready.

Parameters

spec	I2C specification from devicetree

Return values

true	if the I2C bus is ready for use.
false	if the I2C bus is not ready for use.

◆ i2c_is_stop_op()

static bool i2c_is_stop_op ( const struct i2c_msg * msg )

inlinestatic

#include <zephyr/drivers/i2c.h>

Check if the current message includes a stop.

Parameters

msg	The message to check

Returns: true if the I2C message includes a stop; false if the I2C message includes a stop

◆ i2c_read()

static int i2c_read	(	const struct device *	dev,
		uint8_t *	buf,
		uint32_t	num_bytes,
		uint16_t	addr )

inlinestatic

#include <zephyr/drivers/i2c.h>

Read a set amount of data from an I2C device.

This routine reads a set amount of data synchronously.

Parameters

dev	Pointer to the device structure for an I2C controller driver configured in controller mode.
buf	Memory pool that stores the retrieved data.
num_bytes	Number of bytes to read.
addr	Address of the I2C device being read.

Return values

0	If successful.
-EIO	General input / output error.

◆ i2c_read_dt()

static int i2c_read_dt	(	const struct i2c_dt_spec *	spec,
		uint8_t *	buf,
		uint32_t	num_bytes )

inlinestatic

#include <zephyr/drivers/i2c.h>

Read a set amount of data from an I2C device.

This is equivalent to:

i2c_read(spec->bus, buf, num_bytes, spec->addr);

Parameters

spec	I2C specification from devicetree.
buf	Memory pool that stores the retrieved data.
num_bytes	Number of bytes to read.

Returns: a value from i2c_read()

◆ i2c_recover_bus()

int i2c_recover_bus ( const struct device * dev )

#include <zephyr/drivers/i2c.h>

Recover the I2C bus.

Attempt to recover the I2C bus.

Parameters

dev	Pointer to the device structure for an I2C controller driver configured in controller mode.

Return values

0	If successful
-EBUSY	If bus is not clear after recovery attempt.
-EIO	General input / output error.
-ENOSYS	If bus recovery is not implemented

◆ i2c_reg_read_byte()

static int i2c_reg_read_byte	(	const struct device *	dev,
		uint16_t	dev_addr,
		uint8_t	reg_addr,
		uint8_t *	value )

inlinestatic

#include <zephyr/drivers/i2c.h>

Read internal register of an I2C device.

This routine reads the value of an 8-bit internal register of an I2C device synchronously.

Parameters

dev	Pointer to the device structure for an I2C controller driver configured in controller mode.
dev_addr	Address of the I2C device for reading.
reg_addr	Address of the internal register being read.
value	Memory pool that stores the retrieved register value.

Return values

0	If successful.
-EIO	General input / output error.

◆ i2c_reg_read_byte_dt()

static int i2c_reg_read_byte_dt	(	const struct i2c_dt_spec *	spec,
		uint8_t	reg_addr,
		uint8_t *	value )

inlinestatic

#include <zephyr/drivers/i2c.h>

Read internal register of an I2C device.

This is equivalent to:

i2c_reg_read_byte(spec->bus, spec->addr, reg_addr, value);

Parameters

spec	I2C specification from devicetree.
reg_addr	Address of the internal register being read.
value	Memory pool that stores the retrieved register value.

Returns: a value from i2c_reg_read_byte()

◆ i2c_reg_update_byte()

static int i2c_reg_update_byte	(	const struct device *	dev,
		uint8_t	dev_addr,
		uint8_t	reg_addr,
		uint8_t	mask,
		uint8_t	value )

inlinestatic

#include <zephyr/drivers/i2c.h>

Update internal register of an I2C device.

This routine updates the value of a set of bits from an 8-bit internal register of an I2C device synchronously.

Note: If the calculated new register value matches the value that was read this function will not generate a write operation.

Parameters

dev	Pointer to the device structure for an I2C controller driver configured in controller mode.
dev_addr	Address of the I2C device for updating.
reg_addr	Address of the internal register being updated.
mask	Bitmask for updating internal register.
value	Value for updating internal register.

Return values

0	If successful.
-EIO	General input / output error.

◆ i2c_reg_update_byte_dt()

static int i2c_reg_update_byte_dt	(	const struct i2c_dt_spec *	spec,
		uint8_t	reg_addr,
		uint8_t	mask,
		uint8_t	value )

inlinestatic

#include <zephyr/drivers/i2c.h>

Update internal register of an I2C device.

This is equivalent to:

i2c_reg_update_byte(spec->bus, spec->addr, reg_addr, mask, value);

Parameters

spec	I2C specification from devicetree.
reg_addr	Address of the internal register being updated.
mask	Bitmask for updating internal register.
value	Value for updating internal register.

Returns: a value from i2c_reg_update_byte()

◆ i2c_reg_write_byte()

static int i2c_reg_write_byte	(	const struct device *	dev,
		uint16_t	dev_addr,
		uint8_t	reg_addr,
		uint8_t	value )

inlinestatic

#include <zephyr/drivers/i2c.h>

Write internal register of an I2C device.

This routine writes a value to an 8-bit internal register of an I2C device synchronously.

Note: This function internally combines the register and value into a single bus transaction.

Parameters

dev	Pointer to the device structure for an I2C controller driver configured in controller mode.
dev_addr	Address of the I2C device for writing.
reg_addr	Address of the internal register being written.
value	Value to be written to internal register.

Return values

0	If successful.
-EIO	General input / output error.

◆ i2c_reg_write_byte_dt()

static int i2c_reg_write_byte_dt	(	const struct i2c_dt_spec *	spec,
		uint8_t	reg_addr,
		uint8_t	value )

inlinestatic

#include <zephyr/drivers/i2c.h>

Write internal register of an I2C device.

This is equivalent to:

i2c_reg_write_byte(spec->bus, spec->addr, reg_addr, value);

Parameters

spec	I2C specification from devicetree.
reg_addr	Address of the internal register being written.
value	Value to be written to internal register.

Returns: a value from i2c_reg_write_byte()

◆ i2c_rtio_copy()

struct rtio_sqe * i2c_rtio_copy	(	struct rtio *	r,
		struct rtio_iodev *	iodev,
		const struct i2c_msg *	msgs,
		uint8_t	num_msgs )

#include <zephyr/drivers/i2c.h>

Copy the i2c_msgs into a set of RTIO requests.

Parameters

r	RTIO context
iodev	RTIO IODev to target for the submissions
msgs	Array of messages
num_msgs	Number of i2c msgs in array

Return values

sqe	Last submission in the queue added
NULL	Not enough memory in the context to copy the requests

◆ i2c_target_driver_register()

int i2c_target_driver_register ( const struct device * dev )

#include <zephyr/drivers/i2c.h>

Instructs the I2C Target device to register itself to the I2C Controller.

This routine instructs the I2C Target device to register itself to the I2C Controller via its parent controller's i2c_target_register() API.

Parameters

dev	Pointer to the device structure for the I2C target device (not itself an I2C controller).

Return values

0	Is successful
-EINVAL	If parameters are invalid
-EIO	General input / output error.

◆ i2c_target_driver_unregister()

int i2c_target_driver_unregister ( const struct device * dev )

#include <zephyr/drivers/i2c.h>

Instructs the I2C Target device to unregister itself from the I2C Controller.

This routine instructs the I2C Target device to unregister itself from the I2C Controller via its parent controller's i2c_target_register() API.

Parameters

dev	Pointer to the device structure for the I2C target device (not itself an I2C controller).

Return values

0	Is successful
-EINVAL	If parameters are invalid

◆ i2c_target_register()

static int i2c_target_register	(	const struct device *	dev,
		struct i2c_target_config *	cfg )

inlinestatic

#include <zephyr/drivers/i2c.h>

Registers the provided config as Target device of a controller.

Enable I2C target mode for the 'dev' I2C bus driver using the provided 'config' struct containing the functions and parameters to send bus events. The I2C target will be registered at the address provided as 'address' struct member. Addressing mode - 7 or 10 bit - depends on the 'flags' struct member. Any I2C bus events related to the target mode will be passed onto I2C target device driver via a set of callback functions provided in the 'callbacks' struct member.

Most of the existing hardware allows simultaneous support for controller and target mode. This is however not guaranteed.

Parameters

dev	Pointer to the device structure for an I2C controller driver configured in target mode.
cfg	Config struct with functions and parameters used by the I2C driver to send bus events

Return values

0	Is successful
-EINVAL	If parameters are invalid
-EIO	General input / output error.
-ENOSYS	If target mode is not implemented

◆ i2c_target_unregister()

static int i2c_target_unregister	(	const struct device *	dev,
		struct i2c_target_config *	cfg )

inlinestatic

#include <zephyr/drivers/i2c.h>

Unregisters the provided config as Target device.

This routine disables I2C target mode for the 'dev' I2C bus driver using the provided 'config' struct containing the functions and parameters to send bus events.

Parameters

dev	Pointer to the device structure for an I2C controller driver configured in target mode.
cfg	Config struct with functions and parameters used by the I2C driver to send bus events

Return values

0	Is successful
-EINVAL	If parameters are invalid
-ENOSYS	If target mode is not implemented

◆ i2c_transfer()

int i2c_transfer	(	const struct device *	dev,
		struct i2c_msg *	msgs,
		uint8_t	num_msgs,
		uint16_t	addr )

#include <zephyr/drivers/i2c.h>

Perform data transfer to another I2C device in controller mode.

This routine provides a generic interface to perform data transfer to another I2C device synchronously. Use i2c_read()/i2c_write() for simple read or write.

The array of message msgs must not be NULL. The number of message num_msgs may be zero,in which case no transfer occurs.

Note: Not all scatter/gather transactions can be supported by all drivers. As an example, a gather write (multiple consecutive i2c_msg buffers all configured for I2C_MSG_WRITE) may be packed into a single transaction by some drivers, but others may emit each fragment as a distinct write transaction, which will not produce the same behavior. See the documentation of struct i2c_msg for limitations on support for multi-message bus transactions.; The last message in the scatter/gather transaction implies a STOP whether or not it is explicitly set. This ensures the bus is in a good state for the next transaction which may be from a different call context.

Parameters

dev	Pointer to the device structure for an I2C controller driver configured in controller mode.
msgs	Array of messages to transfer.
num_msgs	Number of messages to transfer.
addr	Address of the I2C target device.

Return values

0	If successful.
-EIO	General input / output error.

◆ i2c_transfer_cb()

static int i2c_transfer_cb	(	const struct device *	dev,
		struct i2c_msg *	msgs,
		uint8_t	num_msgs,
		uint16_t	addr,
		i2c_callback_t	cb,
		void *	userdata )

inlinestaticisr-ok

#include <zephyr/drivers/i2c.h>

Perform data transfer to another I2C device in controller mode.

This routine provides a generic interface to perform data transfer to another I2C device asynchronously with a callback completion.

See also: i2c_transfer()

Function properties (list may not be complete)

Parameters

dev	Pointer to the device structure for an I2C controller driver configured in controller mode.
msgs	Array of messages to transfer, must live until callback completes.
num_msgs	Number of messages to transfer.
addr	Address of the I2C target device.
cb	Function pointer for completion callback.
userdata	Userdata passed to callback.

Return values

0	If successful.
-EIO	General input / output error.
-ENOSYS	If transfer async is not implemented
-EWOULDBLOCK	If the device is temporarily busy doing another transfer

◆ i2c_transfer_cb_dt()

static int i2c_transfer_cb_dt	(	const struct i2c_dt_spec *	spec,
		struct i2c_msg *	msgs,
		uint8_t	num_msgs,
		i2c_callback_t	cb,
		void *	userdata )

inlinestatic

#include <zephyr/drivers/i2c.h>

Perform data transfer to another I2C device in master mode asynchronously.

This is equivalent to:

i2c_transfer_cb(spec->bus, msgs, num_msgs, spec->addr, cb, userdata);

Parameters

spec	I2C specification from devicetree.
msgs	Array of messages to transfer.
num_msgs	Number of messages to transfer.
cb	Function pointer for completion callback.
userdata	Userdata passed to callback.

Returns: a value from i2c_transfer_cb()

◆ i2c_transfer_dt()

static int i2c_transfer_dt	(	const struct i2c_dt_spec *	spec,
		struct i2c_msg *	msgs,
		uint8_t	num_msgs )

inlinestatic

#include <zephyr/drivers/i2c.h>

Perform data transfer to another I2C device in controller mode.

This is equivalent to:

i2c_transfer(spec->bus, msgs, num_msgs, spec->addr);

Parameters

spec	I2C specification from devicetree.
msgs	Array of messages to transfer.
num_msgs	Number of messages to transfer.

Returns: a value from i2c_transfer()

◆ i2c_transfer_signal()

static int i2c_transfer_signal	(	const struct device *	dev,
		struct i2c_msg *	msgs,
		uint8_t	num_msgs,
		uint16_t	addr,
		struct k_poll_signal *	sig )

inlinestaticisr-ok

#include <zephyr/drivers/i2c.h>

Perform data transfer to another I2C device in controller mode.

This routine provides a generic interface to perform data transfer to another I2C device asynchronously with a k_poll_signal completion.

See also: i2c_transfer_cb()

Function properties (list may not be complete)

Parameters

dev	Pointer to the device structure for an I2C controller driver configured in controller mode.
msgs	Array of messages to transfer, must live until callback completes.
num_msgs	Number of messages to transfer.
addr	Address of the I2C target device.
sig	Signal to notify of transfer completion.

Return values

0	If successful.
-EIO	General input / output error.
-ENOSYS	If transfer async is not implemented
-EWOULDBLOCK	If the device is temporarily busy doing another transfer

◆ i2c_write()

static int i2c_write	(	const struct device *	dev,
		const uint8_t *	buf,
		uint32_t	num_bytes,
		uint16_t	addr )

inlinestatic

#include <zephyr/drivers/i2c.h>

Write a set amount of data to an I2C device.

This routine writes a set amount of data synchronously.

Parameters

dev	Pointer to the device structure for an I2C controller driver configured in controller mode.
buf	Memory pool from which the data is transferred.
num_bytes	Number of bytes to write.
addr	Address to the target I2C device for writing.

Return values

0	If successful.
-EIO	General input / output error.

◆ i2c_write_dt()

static int i2c_write_dt	(	const struct i2c_dt_spec *	spec,
		const uint8_t *	buf,
		uint32_t	num_bytes )

inlinestatic

#include <zephyr/drivers/i2c.h>

Write a set amount of data to an I2C device.

This is equivalent to:

i2c_write(spec->bus, buf, num_bytes, spec->addr);

Parameters

spec	I2C specification from devicetree.
buf	Memory pool from which the data is transferred.
num_bytes	Number of bytes to write.

Returns: a value from i2c_write()

◆ i2c_write_read()

static int i2c_write_read	(	const struct device *	dev,
		uint16_t	addr,
		const void *	write_buf,
		size_t	num_write,
		void *	read_buf,
		size_t	num_read )

inlinestatic

#include <zephyr/drivers/i2c.h>

Write then read data from an I2C device.

This supports the common operation "this is what I want", "now give it to me" transaction pair through a combined write-then-read bus transaction.

Parameters

dev	Pointer to the device structure for an I2C controller driver configured in controller mode.
addr	Address of the I2C device
write_buf	Pointer to the data to be written
num_write	Number of bytes to write
read_buf	Pointer to storage for read data
num_read	Number of bytes to read

Return values

0	if successful
negative	on error.

◆ i2c_write_read_cb()

static int i2c_write_read_cb	(	const struct device *	dev,
		struct i2c_msg *	msgs,
		uint8_t	num_msgs,
		uint16_t	addr,
		const void *	write_buf,
		size_t	num_write,
		void *	read_buf,
		size_t	num_read,
		i2c_callback_t	cb,
		void *	userdata )

inlinestatic

#include <zephyr/drivers/i2c.h>

Write then read data from an I2C device asynchronously.

This supports the common operation "this is what I want", "now give it to me" transaction pair through a combined write-then-read bus transaction but using i2c_transfer_cb. This helper function expects caller to pass a message pointer with 2 and only 2 size.

Parameters

dev	Pointer to the device structure for an I2C controller driver configured in master mode.
msgs	Array of messages to transfer.
num_msgs	Number of messages to transfer.
addr	Address of the I2C device
write_buf	Pointer to the data to be written
num_write	Number of bytes to write
read_buf	Pointer to storage for read data
num_read	Number of bytes to read
cb	Function pointer for completion callback.
userdata	Userdata passed to callback.

Return values

0	if successful
negative	on error.

◆ i2c_write_read_cb_dt()

static int i2c_write_read_cb_dt	(	const struct i2c_dt_spec *	spec,
		struct i2c_msg *	msgs,
		uint8_t	num_msgs,
		const void *	write_buf,
		size_t	num_write,
		void *	read_buf,
		size_t	num_read,
		i2c_callback_t	cb,
		void *	userdata )

inlinestatic

#include <zephyr/drivers/i2c.h>

Write then read data from an I2C device asynchronously.

This is equivalent to:

i2c_write_read_cb(spec->bus, msgs, num_msgs,
               spec->addr, write_buf,
               num_write, read_buf, num_read);

Parameters

spec	I2C specification from devicetree.
msgs	Array of messages to transfer.
num_msgs	Number of messages to transfer.
write_buf	Pointer to the data to be written
num_write	Number of bytes to write
read_buf	Pointer to storage for read data
num_read	Number of bytes to read
cb	Function pointer for completion callback.
userdata	Userdata passed to callback.

Returns: a value from i2c_write_read_cb()

◆ i2c_write_read_dt()

static int i2c_write_read_dt	(	const struct i2c_dt_spec *	spec,
		const void *	write_buf,
		size_t	num_write,
		void *	read_buf,
		size_t	num_read )

inlinestatic

#include <zephyr/drivers/i2c.h>

Write then read data from an I2C device.

This is equivalent to:

i2c_write_read(spec->bus, spec->addr,
               write_buf, num_write,
               read_buf, num_read);

Parameters

spec	I2C specification from devicetree.
write_buf	Pointer to the data to be written
num_write	Number of bytes to write
read_buf	Pointer to storage for read data
num_read	Number of bytes to read

Returns: a value from i2c_write_read()

◆ i2c_xfer_stats()

static void i2c_xfer_stats	(	const struct device *	dev,
		struct i2c_msg *	msgs,
		uint8_t	num_msgs )

inlinestatic

#include <zephyr/drivers/i2c.h>

Updates the i2c stats for i2c transfers.

Parameters

dev	I2C device to update stats for
msgs	Array of struct i2c_msg
num_msgs	Number of i2c_msgs

Variable Documentation

◆ i2c_iodev_api

const struct rtio_iodev_api i2c_iodev_api

extern

#include <zephyr/drivers/i2c.h>

Data Structures

Macros

Typedefs

Functions

Variables

Detailed Description

Macro Definition Documentation

◆ I2C_ADDR_10_BITS

◆ I2C_DEVICE_DT_DEFINE

◆ I2C_DEVICE_DT_INST_DEFINE

◆ I2C_DT_IODEV_DEFINE

◆ I2C_DT_SPEC_GET

◆ I2C_DT_SPEC_GET_ON_I2C

◆ I2C_DT_SPEC_GET_ON_I3C

◆ I2C_DT_SPEC_INST_GET

◆ I2C_IODEV_DEFINE

◆ I2C_MODE_CONTROLLER

◆ I2C_MSG_ADDR_10_BITS

◆ I2C_MSG_READ

◆ I2C_MSG_RESTART

◆ I2C_MSG_STOP

◆ I2C_MSG_WRITE

◆ I2C_SPEED_DT

◆ I2C_SPEED_FAST

◆ I2C_SPEED_FAST_PLUS

◆ I2C_SPEED_GET

◆ I2C_SPEED_HIGH

◆ I2C_SPEED_MASK

◆ I2C_SPEED_SET

◆ I2C_SPEED_SHIFT

◆ I2C_SPEED_STANDARD

◆ I2C_SPEED_ULTRA

◆ I2C_TARGET_FLAGS_ADDR_10_BITS

Typedef Documentation

◆ i2c_callback_t

◆ i2c_target_read_processed_cb_t

◆ i2c_target_read_requested_cb_t

◆ i2c_target_stop_cb_t

◆ i2c_target_write_received_cb_t

◆ i2c_target_write_requested_cb_t

Function Documentation

◆ i2c_burst_read()

◆ i2c_burst_read_dt()

◆ i2c_burst_write()

◆ i2c_burst_write_dt()

◆ i2c_configure()

◆ i2c_dump_msgs()

◆ i2c_dump_msgs_rw()

◆ i2c_get_config()

◆ i2c_iodev_submit()

◆ i2c_iodev_submit_fallback()

◆ i2c_is_read_op()

◆ i2c_is_ready_dt()

◆ i2c_is_stop_op()

◆ i2c_read()

◆ i2c_read_dt()

◆ i2c_recover_bus()

◆ i2c_reg_read_byte()

◆ i2c_reg_read_byte_dt()

◆ i2c_reg_update_byte()

◆ i2c_reg_update_byte_dt()

◆ i2c_reg_write_byte()

◆ i2c_reg_write_byte_dt()

◆ i2c_rtio_copy()

◆ i2c_target_driver_register()

◆ i2c_target_driver_unregister()

◆ i2c_target_register()

◆ i2c_target_unregister()

◆ i2c_transfer()

◆ i2c_transfer_cb()

◆ i2c_transfer_cb_dt()

◆ i2c_transfer_dt()

◆ i2c_transfer_signal()

◆ i2c_write()

◆ i2c_write_dt()

◆ i2c_write_read()

◆ i2c_write_read_cb()

◆ i2c_write_read_cb_dt()

◆ i2c_write_read_dt()

◆ i2c_xfer_stats()