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I2C Driver
I2C: Inter-Integrated Circuit Driver

## Overview

The KSDK provides a peripheral driver for the Inter-Integrated Circuit (I2C) module of Kinetis devices.

The I2C driver includes functional APIs and transactional APIs.

Functional APIs are feature/property target low-level APIs. Functional APIs can be used for the I2C master/slave initialization/configuration/operation for optimization/customization purpose. Using the functional APIs requires the knowledge of the I2C master peripheral and how to organize functional APIs to meet the application requirements. The I2C functional operation groups provide the functional APIs set.

Transactional APIs are transaction target high-level APIs. The transactional APIs can be used to enable the peripheral quickly and also in the application if the code size and performance of transactional APIs satisfy the requirements. If the code size and performance are critical requirements, see the transactional API implementation and write custom code using the functional APIs or accessing the hardware registers.

Transactional APIs support asynchronous transfer. This means that the functions I2C_MasterTransferNonBlocking() set up the interrupt non-blocking transfer. When the transfer completes, the upper layer is notified through a callback function with the status.

# Typical use case

## Master Operation in functional method

i2c_master_config_t masterConfig;
uint8_t status;
status_t result = kStatus_Success;
uint8_t txBuff[BUFFER_SIZE];
/* Get default configuration for master. */
I2C_MasterGetDefaultConfig(&masterConfig);
/* Init I2C master. */
I2C_MasterInit(EXAMPLE_I2C_MASTER_BASEADDR, &masterConfig, I2C_MASTER_CLK);
/* Send start and slave address. */
I2C_MasterStart(EXAMPLE_I2C_MASTER_BASEADDR, 7-bit slave address, kI2C_Write/kI2C_Read);
/* Wait address sent out. */
while(!((status = I2C_GetStatusFlag(EXAMPLE_I2C_MASTER_BASEADDR)) & kI2C_IntPendingFlag))
{
}
if(status & kI2C_ReceiveNakFlag)
{
return kStatus_I2C_Nak;
}
result = I2C_MasterWriteBlocking(EXAMPLE_I2C_MASTER_BASEADDR, txBuff, BUFFER_SIZE);
if(result)
{
/* If error occours, send STOP. */
I2C_MasterStop(EXAMPLE_I2C_MASTER_BASEADDR, kI2CStop);
return result;
}
while(!(I2C_GetStatusFlag(EXAMPLE_I2C_MASTER_BASEADDR) & kI2C_IntPendingFlag))
{
}
/* Wait all data sent out, send STOP. */
I2C_MasterStop(EXAMPLE_I2C_MASTER_BASEADDR, kI2CStop);

## Master Operation in interrupt transactional method

i2c_master_handle_t g_m_handle;
volatile bool g_MasterCompletionFlag = false;
i2c_master_config_t masterConfig;
uint8_t status;
status_t result = kStatus_Success;
uint8_t txBuff[BUFFER_SIZE];
i2c_master_transfer_t masterXfer;
static void i2c_master_callback(I2C_Type *base, i2c_master_handle_t *handle, status_t status, void *userData)
{
/* Signal transfer success when received success status. */
if (status == kStatus_Success)
{
g_MasterCompletionFlag = true;
}
}
/* Get default configuration for master. */
I2C_MasterGetDefaultConfig(&masterConfig);
/* Init I2C master. */
I2C_MasterInit(EXAMPLE_I2C_MASTER_BASEADDR, &masterConfig, I2C_MASTER_CLK);
masterXfer.slaveAddress = I2C_MASTER_SLAVE_ADDR_7BIT;
masterXfer.direction = kI2C_Write;
masterXfer.subaddress = NULL;
masterXfer.subaddressSize = 0;
masterXfer.data = txBuff;
masterXfer.dataSize = BUFFER_SIZE;
masterXfer.flags = kI2C_TransferDefaultFlag;
I2C_MasterTransferCreateHandle(EXAMPLE_I2C_MASTER_BASEADDR, &g_m_handle, i2c_master_callback, NULL);
I2C_MasterTransferNonBlocking(EXAMPLE_I2C_MASTER_BASEADDR, &g_m_handle, &masterXfer);
/* Wait for transfer completed. */
while (!g_MasterCompletionFlag)
{
}
g_MasterCompletionFlag = false;

## Master Operation in DMA transactional method

i2c_master_dma_handle_t g_m_dma_handle;
dma_handle_t dmaHandle;
volatile bool g_MasterCompletionFlag = false;
i2c_master_config_t masterConfig;
uint8_t txBuff[BUFFER_SIZE];
i2c_master_transfer_t masterXfer;
static void i2c_master_callback(I2C_Type *base, i2c_master_dma_handle_t *handle, status_t status, void *userData)
{
/* Signal transfer success when received success status. */
if (status == kStatus_Success)
{
g_MasterCompletionFlag = true;
}
}
/* Get default configuration for master. */
I2C_MasterGetDefaultConfig(&masterConfig);
/* Init I2C master. */
I2C_MasterInit(EXAMPLE_I2C_MASTER_BASEADDR, &masterConfig, I2C_MASTER_CLK);
masterXfer.slaveAddress = I2C_MASTER_SLAVE_ADDR_7BIT;
masterXfer.direction = kI2C_Write;
masterXfer.subaddress = NULL;
masterXfer.subaddressSize = 0;
masterXfer.data = txBuff;
masterXfer.dataSize = BUFFER_SIZE;
masterXfer.flags = kI2C_TransferDefaultFlag;
DMAMGR_RequestChannel((dma_request_source_t)DMA_REQUEST_SRC, 0, &dmaHandle);
I2C_MasterTransferCreateHandleDMA(EXAMPLE_I2C_MASTER_BASEADDR, &g_m_dma_handle, i2c_master_callback, NULL, &dmaHandle);
I2C_MasterTransferDMA(EXAMPLE_I2C_MASTER_BASEADDR, &g_m_dma_handle, &masterXfer);
/* Wait for transfer completed. */
while (!g_MasterCompletionFlag)
{
}
g_MasterCompletionFlag = false;

## Slave Operation in functional method

i2c_slave_config_t slaveConfig;
uint8_t status;
status_t result = kStatus_Success;
I2C_SlaveGetDefaultConfig(&slaveConfig); /*default configuration 7-bit addressing mode*/
slaveConfig.slaveAddr = 7-bit address
slaveConfig.addressingMode = kI2C_Address7bit/kI2C_RangeMatch;
I2C_SlaveInit(EXAMPLE_I2C_SLAVE_BASEADDR, &slaveConfig);
/* Wait address match. */
while(!((status = I2C_GetStatusFlag(EXAMPLE_I2C_SLAVE_BASEADDR)) & kI2C_AddressMatchFlag))
{
}
/* Slave transmit, master reading from slave. */
if (status & kI2C_TransferDirectionFlag)
{
result = I2C_SlaveWriteBlocking(EXAMPLE_I2C_SLAVE_BASEADDR);
}
else
{
I2C_SlaveReadBlocking(EXAMPLE_I2C_SLAVE_BASEADDR);
}
return result;

## Slave Operation in interrupt transactional method

i2c_slave_config_t slaveConfig;
i2c_slave_handle_t g_s_handle;
volatile bool g_SlaveCompletionFlag = false;
static void i2c_slave_callback(I2C_Type *base, i2c_slave_transfer_t *xfer, void *userData)
{
switch (xfer->event)
{
/* Transmit request */
case kI2C_SlaveTransmitEvent:
/* Update information for transmit process */
xfer->data = g_slave_buff;
xfer->dataSize = I2C_DATA_LENGTH;
break;
/* Receive request */
case kI2C_SlaveReceiveEvent:
/* Update information for received process */
xfer->data = g_slave_buff;
xfer->dataSize = I2C_DATA_LENGTH;
break;
/* Transfer done */
case kI2C_SlaveCompletionEvent:
g_SlaveCompletionFlag = true;
break;
default:
g_SlaveCompletionFlag = true;
break;
}
}
I2C_SlaveGetDefaultConfig(&slaveConfig); /*default configuration 7-bit addressing mode*/
slaveConfig.slaveAddr = 7-bit address
slaveConfig.addressingMode = kI2C_Address7bit/kI2C_RangeMatch;
I2C_SlaveInit(EXAMPLE_I2C_SLAVE_BASEADDR, &slaveConfig);
I2C_SlaveTransferCreateHandle(EXAMPLE_I2C_SLAVE_BASEADDR, &g_s_handle, i2c_slave_callback, NULL);
I2C_SlaveTransferNonBlocking(EXAMPLE_I2C_SLAVE_BASEADDR, &g_s_handle, kI2C_SlaveCompletionEvent);
/* Wait for transfer completed. */
while (!g_SlaveCompletionFlag)
{
}
g_SlaveCompletionFlag = false;

## Data Structures

struct | i2c_master_config_t
| I2C master user configuration. More...
struct | i2c_slave_config_t
| I2C slave user configuration. More...
struct | i2c_master_transfer_t
| I2C master transfer structure. More...
struct | i2c_master_handle_t
| I2C master handle structure. More...
struct | i2c_slave_transfer_t
| I2C slave transfer structure. More...
struct | i2c_slave_handle_t
| I2C slave handle structure. More...

## Typedefs

typedef void(* | i2c_master_transfer_callback_t )(I2C_Type *base, i2c_master_handle_t *handle, status_t status, void *userData)
| I2C master transfer callback typedef. More...
typedef void(* | i2c_slave_transfer_callback_t )(I2C_Type *base, i2c_slave_transfer_t *xfer, void *userData)
| I2C slave transfer callback typedef. More...

## Enumerations

enum | _i2c_status { kStatus_I2C_Busy = MAKE_STATUS(kStatusGroup_I2C, 0), kStatus_I2C_Idle = MAKE_STATUS(kStatusGroup_I2C, 1), kStatus_I2C_Nak = MAKE_STATUS(kStatusGroup_I2C, 2), kStatus_I2C_ArbitrationLost = MAKE_STATUS(kStatusGroup_I2C, 3), kStatus_I2C_Timeout = MAKE_STATUS(kStatusGroup_I2C, 4) }
| I2C status return codes. More...
enum | _i2c_flags { kI2C_ReceiveNakFlag = I2C_S_RXAK_MASK, kI2C_IntPendingFlag = I2C_S_IICIF_MASK, kI2C_TransferDirectionFlag = I2C_S_SRW_MASK, kI2C_RangeAddressMatchFlag = I2C_S_RAM_MASK, kI2C_ArbitrationLostFlag = I2C_S_ARBL_MASK, kI2C_BusBusyFlag = I2C_S_BUSY_MASK, kI2C_AddressMatchFlag = I2C_S_IAAS_MASK, kI2C_TransferCompleteFlag = I2C_S_TCF_MASK }
| I2C peripheral flags. More...
enum | _i2c_interrupt_enable { kI2C_GlobalInterruptEnable = I2C_C1_IICIE_MASK }
| I2C feature interrupt source. More...
enum | i2c_direction_t { kI2C_Write = 0x0U, kI2C_Read = 0x1U }
| Direction of master and slave transfers. More...
enum | i2c_slave_address_mode_t { kI2C_Address7bit = 0x0U, kI2C_RangeMatch = 0X2U }
| Addressing mode. More...
enum | _i2c_master_transfer_flags { kI2C_TransferDefaultFlag = 0x0U, kI2C_TransferNoStartFlag = 0x1U, kI2C_TransferRepeatedStartFlag = 0x2U, kI2C_TransferNoStopFlag = 0x4U }
| I2C transfer control flag. More...
enum | i2c_slave_transfer_event_t { kI2C_SlaveAddressMatchEvent = 0x01U, kI2C_SlaveTransmitEvent = 0x02U, kI2C_SlaveReceiveEvent = 0x04U, kI2C_SlaveTransmitAckEvent = 0x08U, kI2C_SlaveCompletionEvent = 0x20U, kI2C_SlaveAllEvents }
| Set of events sent to the callback for nonblocking slave transfers. More...

## Driver version

#define | FSL_I2C_DRIVER_VERSION (MAKE_VERSION(2, 0, 1))
| I2C driver version 2.0.1. More...

## Initialization and deinitialization

void | I2C_MasterInit (I2C_Type *base, const i2c_master_config_t *masterConfig, uint32_t srcClock_Hz)
| Initializes the I2C peripheral. More...
void | I2C_SlaveInit (I2C_Type *base, const i2c_slave_config_t *slaveConfig)
| Initializes the I2C peripheral. More...
void | I2C_MasterDeinit (I2C_Type *base)
| De-initializes the I2C master peripheral. More...
void | I2C_SlaveDeinit (I2C_Type *base)
| De-initializes the I2C slave peripheral. More...
void | I2C_MasterGetDefaultConfig (i2c_master_config_t *masterConfig)
| Sets the I2C master configuration structure to default values. More...
void | I2C_SlaveGetDefaultConfig (i2c_slave_config_t *slaveConfig)
| Sets the I2C slave configuration structure to default values. More...
static void | I2C_Enable (I2C_Type *base, bool enable)
| Enables or disabless the I2C peripheral operation. More...

## Status

uint32_t | I2C_MasterGetStatusFlags (I2C_Type *base)
| Gets the I2C status flags. More...
static uint32_t | I2C_SlaveGetStatusFlags (I2C_Type *base)
| Gets the I2C status flags. More...
static void | I2C_MasterClearStatusFlags (I2C_Type *base, uint32_t statusMask)
| Clears the I2C status flag state. More...
static void | I2C_SlaveClearStatusFlags (I2C_Type *base, uint32_t statusMask)
| Clears the I2C status flag state. More...

## Interrupts

void | I2C_EnableInterrupts (I2C_Type *base, uint32_t mask)
| Enables I2C interrupt requests. More...
void | I2C_DisableInterrupts (I2C_Type *base, uint32_t mask)
| Disables I2C interrupt requests. More...

## DMA Control

static uint32_t | I2C_GetDataRegAddr (I2C_Type *base)
| Gets the I2C tx/rx data register address. More...

## Bus Operations

void | I2C_MasterSetBaudRate (I2C_Type *base, uint32_t baudRate_Bps, uint32_t srcClock_Hz)
| Sets the I2C master transfer baud rate. More...
status_t | I2C_MasterStart (I2C_Type *base, uint8_t address, i2c_direction_t direction)
| Sends a START on the I2C bus. More...
status_t | I2C_MasterStop (I2C_Type *base)
| Sends a STOP signal on the I2C bus. More...
status_t | I2C_MasterRepeatedStart (I2C_Type *base, uint8_t address, i2c_direction_t direction)
| Sends a REPEATED START on the I2C bus. More...
status_t | I2C_MasterWriteBlocking (I2C_Type *base, const uint8_t *txBuff, size_t txSize)
| Performs a polling send transaction on the I2C bus without a STOP signal. More...
status_t | I2C_MasterReadBlocking (I2C_Type *base, uint8_t *rxBuff, size_t rxSize)
| Performs a polling receive transaction on the I2C bus with a STOP signal. More...
status_t | I2C_SlaveWriteBlocking (I2C_Type *base, const uint8_t *txBuff, size_t txSize)
| Performs a polling send transaction on the I2C bus. More...
void | I2C_SlaveReadBlocking (I2C_Type *base, uint8_t *rxBuff, size_t rxSize)
| Performs a polling receive transaction on the I2C bus. More...
status_t | I2C_MasterTransferBlocking (I2C_Type *base, i2c_master_transfer_t *xfer)
| Performs a master polling transfer on the I2C bus. More...

## Transactional

void | I2C_MasterTransferCreateHandle (I2C_Type *base, i2c_master_handle_t *handle, i2c_master_transfer_callback_t callback, void *userData)
| Initializes the I2C handle which is used in transactional functions. More...
status_t | I2C_MasterTransferNonBlocking (I2C_Type *base, i2c_master_handle_t *handle, i2c_master_transfer_t *xfer)
| Performs a master interrupt non-blocking transfer on the I2C bus. More...
status_t | I2C_MasterTransferGetCount (I2C_Type *base, i2c_master_handle_t *handle, size_t *count)
| Gets the master transfer status during a interrupt non-blocking transfer. More...
void | I2C_MasterTransferAbort (I2C_Type *base, i2c_master_handle_t *handle)
| Aborts an interrupt non-blocking transfer early. More...
void | I2C_MasterTransferHandleIRQ (I2C_Type *base, void *i2cHandle)
| Master interrupt handler. More...
void | I2C_SlaveTransferCreateHandle (I2C_Type *base, i2c_slave_handle_t *handle, i2c_slave_transfer_callback_t callback, void *userData)
| Initializes the I2C handle which is used in transactional functions. More...
status_t | I2C_SlaveTransferNonBlocking (I2C_Type *base, i2c_slave_handle_t *handle, uint32_t eventMask)
| Starts accepting slave transfers. More...
void | I2C_SlaveTransferAbort (I2C_Type *base, i2c_slave_handle_t *handle)
| Aborts the slave transfer. More...
status_t | I2C_SlaveTransferGetCount (I2C_Type *base, i2c_slave_handle_t *handle, size_t *count)
| Gets the slave transfer remaining bytes during a interrupt non-blocking transfer. More...
void | I2C_SlaveTransferHandleIRQ (I2C_Type *base, void *i2cHandle)
| Slave interrupt handler. More...

## Data Structure Documentation

struct i2c_master_config_t

### Data Fields

bool | enableMaster
| Enables the I2C peripheral at initialization time. More...
uint32_t | baudRate_Bps
| Baud rate configuration of I2C peripheral. More...
uint8_t | glitchFilterWidth
| Controls the width of the glitch. More...

#### Field Documentation

bool i2c_master_config_t::enableMaster

uint32_t i2c_master_config_t::baudRate_Bps

uint8_t i2c_master_config_t::glitchFilterWidth

struct i2c_slave_config_t

### Data Fields

bool | enableSlave
| Enables the I2C peripheral at initialization time. More...
bool | enableGeneralCall
| Enable general call addressing mode. More...
bool | enableWakeUp
| Enables/disables waking up MCU from low-power mode. More...
bool | enableBaudRateCtl
| Enables/disables independent slave baud rate on SCL in very fast I2C modes. More...
uint16_t | slaveAddress
| Slave address configuration. More...
uint16_t | upperAddress
| Maximum boundary slave address used in range matching mode. More...
i2c_slave_address_mode_t | addressingMode
| Addressing mode configuration of i2c_slave_address_mode_config_t. More...

#### Field Documentation

bool i2c_slave_config_t::enableSlave

bool i2c_slave_config_t::enableGeneralCall

bool i2c_slave_config_t::enableWakeUp

bool i2c_slave_config_t::enableBaudRateCtl

uint16_t i2c_slave_config_t::slaveAddress

uint16_t i2c_slave_config_t::upperAddress

i2c_slave_address_mode_t i2c_slave_config_t::addressingMode

struct i2c_master_transfer_t

### Data Fields

uint32_t | flags
| Transfer flag which controls the transfer. More...
uint8_t | slaveAddress
| 7-bit slave address. More...
i2c_direction_t | direction
| Transfer direction, read or write. More...
uint32_t | subaddress
| Sub address. More...
uint8_t | subaddressSize
| Size of command buffer. More...
uint8_t *volatile | data
| Transfer buffer. More...
volatile size_t | dataSize
| Transfer size. More...

#### Field Documentation

uint32_t i2c_master_transfer_t::flags

uint8_t i2c_master_transfer_t::slaveAddress

i2c_direction_t i2c_master_transfer_t::direction

uint32_t i2c_master_transfer_t::subaddress

Transferred MSB first.

uint8_t i2c_master_transfer_t::subaddressSize

uint8_t* volatile i2c_master_transfer_t::data

volatile size_t i2c_master_transfer_t::dataSize

struct _i2c_master_handle

I2C master handle typedef.

### Data Fields

i2c_master_transfer_t | transfer
| I2C master transfer copy. More...
size_t | transferSize
| Total bytes to be transferred. More...
uint8_t | state
| Transfer state maintained during transfer. More...
i2c_master_transfer_callback_t | completionCallback
| Callback function called when transfer finished. More...
void * | userData
| Callback parameter passed to callback function. More...

#### Field Documentation

i2c_master_transfer_t i2c_master_handle_t::transfer

size_t i2c_master_handle_t::transferSize

uint8_t i2c_master_handle_t::state

i2c_master_transfer_callback_t i2c_master_handle_t::completionCallback

void* i2c_master_handle_t::userData

struct i2c_slave_transfer_t

### Data Fields

i2c_slave_transfer_event_t | event
| Reason the callback is being invoked. More...
uint8_t *volatile | data
| Transfer buffer. More...
volatile size_t | dataSize
| Transfer size. More...
status_t | completionStatus
| Success or error code describing how the transfer completed. More...
size_t | transferredCount
| Number of bytes actually transferred since start or last repeated start. More...

#### Field Documentation

i2c_slave_transfer_event_t i2c_slave_transfer_t::event

uint8_t* volatile i2c_slave_transfer_t::data

volatile size_t i2c_slave_transfer_t::dataSize

status_t i2c_slave_transfer_t::completionStatus

Only applies for kI2C_SlaveCompletionEvent.

size_t i2c_slave_transfer_t::transferredCount

struct _i2c_slave_handle

I2C slave handle typedef.

### Data Fields

bool | isBusy
| Whether transfer is busy. More...
i2c_slave_transfer_t | transfer
| I2C slave transfer copy. More...
uint32_t | eventMask
| Mask of enabled events. More...
i2c_slave_transfer_callback_t | callback
| Callback function called at transfer event. More...
void * | userData
| Callback parameter passed to callback. More...

#### Field Documentation

bool i2c_slave_handle_t::isBusy

i2c_slave_transfer_t i2c_slave_handle_t::transfer

uint32_t i2c_slave_handle_t::eventMask

i2c_slave_transfer_callback_t i2c_slave_handle_t::callback

void* i2c_slave_handle_t::userData

## Macro Definition Documentation

#define FSL_I2C_DRIVER_VERSION (MAKE_VERSION(2, 0, 1))

## Typedef Documentation

typedef void(* i2c_master_transfer_callback_t)(I2C_Type *base, i2c_master_handle_t *handle, status_t status, void *userData)

typedef void(* i2c_slave_transfer_callback_t)(I2C_Type *base, i2c_slave_transfer_t *xfer, void *userData)

## Enumeration Type Documentation

enum _i2c_status

Enumerator
kStatus_I2C_Busy | I2C is busy with current transfer.
kStatus_I2C_Idle | Bus is Idle.
kStatus_I2C_Nak | NAK received during transfer.
kStatus_I2C_ArbitrationLost | Arbitration lost during transfer.
kStatus_I2C_Timeout | Wait event timeout.

enum _i2c_flags

The following status register flags can be cleared:

- kI2C_ArbitrationLostFlag
- kI2C_IntPendingFlag
- #kI2C_StartDetectFlag
- #kI2C_StopDetectFlag

Note
  These enumerations are meant to be OR'd together to form a bit mask.

Enumerator
kI2C_ReceiveNakFlag | I2C receive NAK flag.
kI2C_IntPendingFlag | I2C interrupt pending flag.
kI2C_TransferDirectionFlag | I2C transfer direction flag.
kI2C_RangeAddressMatchFlag | I2C range address match flag.
kI2C_ArbitrationLostFlag | I2C arbitration lost flag.
kI2C_BusBusyFlag | I2C bus busy flag.
kI2C_AddressMatchFlag | I2C address match flag.
kI2C_TransferCompleteFlag | I2C transfer complete flag.

enum _i2c_interrupt_enable

Enumerator
kI2C_GlobalInterruptEnable | I2C global interrupt.

enum i2c_direction_t

Enumerator
kI2C_Write | Master transmit to slave.
kI2C_Read | Master receive from slave.

enum i2c_slave_address_mode_t

Enumerator
kI2C_Address7bit | 7-bit addressing mode.
kI2C_RangeMatch | Range address match addressing mode.

enum _i2c_master_transfer_flags

Enumerator
kI2C_TransferDefaultFlag | Transfer starts with a start signal, stops with a stop signal.
kI2C_TransferNoStartFlag | Transfer starts without a start signal.
kI2C_TransferRepeatedStartFlag | Transfer starts with a repeated start signal.
kI2C_TransferNoStopFlag | Transfer ends without a stop signal.

enum i2c_slave_transfer_event_t

These event enumerations are used for two related purposes. First, a bit mask created by OR'ing together events is passed to I2C_SlaveTransferNonBlocking() in order to specify which events to enable. Then, when the slave callback is invoked, it is passed the current event through its transfer parameter.

Note
  These enumerations are meant to be OR'd together to form a bit mask of events.

Enumerator
kI2C_SlaveAddressMatchEvent | Received the slave address after a start or repeated start.
kI2C_SlaveTransmitEvent | Callback is requested to provide data to transmit (slave-transmitter role).
kI2C_SlaveReceiveEvent | Callback is requested to provide a buffer in which to place received data (slave-receiver role).
kI2C_SlaveTransmitAckEvent | Callback needs to either transmit an ACK or NACK.
kI2C_SlaveCompletionEvent | A stop was detected or finished transfer, completing the transfer.
kI2C_SlaveAllEvents | Bit mask of all available events.

## Function Documentation

void I2C_MasterInit | ( | I2C_Type * | base,
|  | const i2c_master_config_t * | masterConfig,
|  | uint32_t | srcClock_Hz
| ) |  |

Call this API to ungate the I2C clock and configure the I2C with master configuration.

Note
  This API should be called at the beginning of the application to use the I2C driver, or any operation to the I2C module may cause a hard fault because clock is not enabled. The configuration structure can be filled by user from scratch, or be set with default values by I2C_MasterGetDefaultConfig(). After calling this API, the master is ready to transfer. Example:
  * i2c_master_config_t config = {
  * .enableMaster = true,
  * .enableStopHold = false,
  * .highDrive = false,
  * .baudRate_Bps = 100000,
  * .glitchFilterWidth = 0
  * };
  * I2C_MasterInit(I2C0, &config, 12000000U);
  *

Parameters

  base | I2C base pointer
  masterConfig | pointer to master configuration structure
  srcClock_Hz | I2C peripheral clock frequency in Hz

void I2C_SlaveInit | ( | I2C_Type * | base,
|  | const i2c_slave_config_t * | slaveConfig
| ) |  |

Call this API to ungate the I2C clock and initializes the I2C with slave configuration.

Note
  This API should be called at the beginning of the application to use the I2C driver, or any operation to the I2C module can cause a hard fault because the clock is not enabled. The configuration structure can partly be set with default values by I2C_SlaveGetDefaultConfig(), or can be filled by the user. Example
  * i2c_slave_config_t config = {
  * .enableSlave = true,
  * .enableGeneralCall = false,
  * .addressingMode = kI2C_Address7bit,
  * .slaveAddress = 0x1DU,
  * .enableWakeUp = false,
  * .enablehighDrive = false,
  * .enableBaudRateCtl = false
  * };
  * I2C_SlaveInit(I2C0, &config);
  *

Parameters

  base | I2C base pointer
  slaveConfig | pointer to slave configuration structure

void I2C_MasterDeinit | ( | I2C_Type * | base | ) |

Call this API to gate the I2C clock. The I2C master module can't work unless the I2C_MasterInit is called.

Parameters

  base | I2C base pointer

void I2C_SlaveDeinit | ( | I2C_Type * | base | ) |

Calling this API gates the I2C clock. The I2C slave module can't work unless the I2C_SlaveInit is called to enable the clock.

Parameters

  base | I2C base pointer

void I2C_MasterGetDefaultConfig | ( | i2c_master_config_t * | masterConfig | ) |

The purpose of this API is to get the configuration structure initialized for use in the I2C_MasterConfigure(). Use the initialized structure unchanged in I2C_MasterConfigure(), or modify some fields of the structure before calling I2C_MasterConfigure(). Example:

* i2c_master_config_t config;
* I2C_MasterGetDefaultConfig(&config);
*

Parameters

  masterConfig | Pointer to the master configuration structure.

void I2C_SlaveGetDefaultConfig | ( | i2c_slave_config_t * | slaveConfig | ) |

The purpose of this API is to get the configuration structure initialized for use in I2C_SlaveConfigure(). Modify fields of the structure before calling the I2C_SlaveConfigure(). Example:

* i2c_slave_config_t config;
* I2C_SlaveGetDefaultConfig(&config);
*

Parameters

  slaveConfig | Pointer to the slave configuration structure.

static void I2C_Enable | ( | I2C_Type * | base,
|  | bool | enable
| ) |  |

inlinestatic

Parameters

  base | I2C base pointer
  enable | pass true to enable module, false to disable module

uint32_t I2C_MasterGetStatusFlags | ( | I2C_Type * | base | ) |

Parameters

  base | I2C base pointer

Returns
  status flag, use status flag to AND _i2c_flags to get the related status.

static uint32_t I2C_SlaveGetStatusFlags | ( | I2C_Type * | base | ) |

inlinestatic

Parameters

  base | I2C base pointer

Returns
  status flag, use status flag to AND _i2c_flags to get the related status.

static void I2C_MasterClearStatusFlags | ( | I2C_Type * | base,
|  | uint32_t | statusMask
| ) |  |

inlinestatic

The following status register flags can be cleared: kI2C_ArbitrationLostFlag and kI2C_IntPendingFlag

Parameters

  base | I2C base pointer

  statusMask

  The status flag mask, defined in type i2c_status_flag_t. The parameter can be any combination of the following values:
  - kI2C_StartDetectFlag (if available)
  - kI2C_StopDetectFlag (if available)
  - kI2C_ArbitrationLostFlag
  - kI2C_IntPendingFlagFlag

static void I2C_SlaveClearStatusFlags | ( | I2C_Type * | base,
|  | uint32_t | statusMask
| ) |  |

inlinestatic

The following status register flags can be cleared: kI2C_ArbitrationLostFlag and kI2C_IntPendingFlag

Parameters

  base | I2C base pointer

  statusMask

  The status flag mask, defined in type i2c_status_flag_t. The parameter can be any combination of the following values:
  - kI2C_StartDetectFlag (if available)
  - kI2C_StopDetectFlag (if available)
  - kI2C_ArbitrationLostFlag
  - kI2C_IntPendingFlagFlag

void I2C_EnableInterrupts | ( | I2C_Type * | base,
|  | uint32_t | mask
| ) |  |

Parameters

  base | I2C base pointer

  mask

  interrupt source The parameter can be combination of the following source if defined:
  - kI2C_GlobalInterruptEnable
  - kI2C_StopDetectInterruptEnable/kI2C_StartDetectInterruptEnable
  - kI2C_SdaTimeoutInterruptEnable

void I2C_DisableInterrupts | ( | I2C_Type * | base,
|  | uint32_t | mask
| ) |  |

Parameters

  base | I2C base pointer

  mask

  interrupt source The parameter can be combination of the following source if defined:
  - kI2C_GlobalInterruptEnable
  - kI2C_StopDetectInterruptEnable/kI2C_StartDetectInterruptEnable
  - kI2C_SdaTimeoutInterruptEnable

static uint32_t I2C_GetDataRegAddr | ( | I2C_Type * | base | ) |

inlinestatic

This API is used to provide a transfer address for I2C DMA transfer configuration.

Parameters

  base | I2C base pointer

Returns
  data register address

void I2C_MasterSetBaudRate | ( | I2C_Type * | base,
|  | uint32_t | baudRate_Bps,
|  | uint32_t | srcClock_Hz
| ) |  |

Parameters

  base | I2C base pointer
  baudRate_Bps | the baud rate value in bps
  srcClock_Hz | Source clock

status_t I2C_MasterStart | ( | I2C_Type * | base,
|  | uint8_t | address,
|  | i2c_direction_t | direction
| ) |  |

This function is used to initiate a new master mode transfer by sending the START signal. The slave address is sent following the I2C START signal.

Parameters

  base | I2C peripheral base pointer
  address | 7-bit slave device address.
  direction | Master transfer directions(transmit/receive).

Return values

  kStatus_Success | Successfully send the start signal.
  kStatus_I2C_Busy | Current bus is busy.

status_t I2C_MasterStop | ( | I2C_Type * | base | ) |

Return values

  kStatus_Success | Successfully send the stop signal.
  kStatus_I2C_Timeout | Send stop signal failed, timeout.

status_t I2C_MasterRepeatedStart | ( | I2C_Type * | base,
|  | uint8_t | address,
|  | i2c_direction_t | direction
| ) |  |

Parameters

  base | I2C peripheral base pointer
  address | 7-bit slave device address.
  direction | Master transfer directions(transmit/receive).

Return values

  kStatus_Success | Successfully send the start signal.
  kStatus_I2C_Busy | Current bus is busy but not occupied by current I2C master.

status_t I2C_MasterWriteBlocking | ( | I2C_Type * | base,
|  | const uint8_t * | txBuff,
|  | size_t | txSize
| ) |  |

Parameters

  base | The I2C peripheral base pointer.
  txBuff | The pointer to the data to be transferred.
  txSize | The length in bytes of the data to be transferred.

Return values

  kStatus_Success | Successfully complete the data transmission.
  kStatus_I2C_ArbitrationLost | Transfer error, arbitration lost.
  kStataus_I2C_Nak | Transfer error, receive NAK during transfer.

status_t I2C_MasterReadBlocking | ( | I2C_Type * | base,
|  | uint8_t * | rxBuff,
|  | size_t | rxSize
| ) |  |

Note
  The I2C_MasterReadBlocking function stops the bus before reading the final byte. Without stopping the bus prior for the final read, the bus issues another read, resulting in garbage data being read into the data register.

Parameters

  base | I2C peripheral base pointer.
  rxBuff | The pointer to the data to store the received data.
  rxSize | The length in bytes of the data to be received.

Return values

  kStatus_Success | Successfully complete the data transmission.
  kStatus_I2C_Timeout | Send stop signal failed, timeout.

status_t I2C_SlaveWriteBlocking | ( | I2C_Type * | base,
|  | const uint8_t * | txBuff,
|  | size_t | txSize
| ) |  |

Parameters

  base | The I2C peripheral base pointer.
  txBuff | The pointer to the data to be transferred.
  txSize | The length in bytes of the data to be transferred.

Return values

  kStatus_Success | Successfully complete the data transmission.
  kStatus_I2C_ArbitrationLost | Transfer error, arbitration lost.
  kStataus_I2C_Nak | Transfer error, receive NAK during transfer.

void I2C_SlaveReadBlocking | ( | I2C_Type * | base,
|  | uint8_t * | rxBuff,
|  | size_t | rxSize
| ) |  |

Parameters

  base | I2C peripheral base pointer.
  rxBuff | The pointer to the data to store the received data.
  rxSize | The length in bytes of the data to be received.

status_t I2C_MasterTransferBlocking | ( | I2C_Type * | base,
|  | i2c_master_transfer_t * | xfer
| ) |  |

Note
  The API does not return until the transfer succeeds or fails due to arbitration lost or receiving a NAK.

Parameters

  base | I2C peripheral base address.
  xfer | Pointer to the transfer structure.

Return values

  kStatus_Success | Successfully complete the data transmission.
  kStatus_I2C_Busy | Previous transmission still not finished.
  kStatus_I2C_Timeout | Transfer error, wait signal timeout.
  kStatus_I2C_ArbitrationLost | Transfer error, arbitration lost.
  kStataus_I2C_Nak | Transfer error, receive NAK during transfer.

void I2C_MasterTransferCreateHandle | ( | I2C_Type * | base,
|  | i2c_master_handle_t * | handle,
|  | i2c_master_transfer_callback_t | callback,
|  | void * | userData
| ) |  |

Parameters

  base | I2C base pointer.
  handle | pointer to i2c_master_handle_t structure to store the transfer state.
  callback | pointer to user callback function.
  userData | user parameter passed to the callback function.

status_t I2C_MasterTransferNonBlocking | ( | I2C_Type * | base,
|  | i2c_master_handle_t * | handle,
|  | i2c_master_transfer_t * | xfer
| ) |  |

Note
  Calling the API returns immediately after transfer initiates. The user needs to call I2C_MasterGetTransferCount to poll the transfer status to check whether the transfer is finished. If the return status is not kStatus_I2C_Busy, the transfer is finished.

Parameters

  base | I2C base pointer.
  handle | pointer to i2c_master_handle_t structure which stores the transfer state.
  xfer | pointer to i2c_master_transfer_t structure.

Return values

  kStatus_Success | Successfully start the data transmission.
  kStatus_I2C_Busy | Previous transmission still not finished.
  kStatus_I2C_Timeout | Transfer error, wait signal timeout.

status_t I2C_MasterTransferGetCount | ( | I2C_Type * | base,
|  | i2c_master_handle_t * | handle,
|  | size_t * | count
| ) |  |

Parameters

  base | I2C base pointer.
  handle | pointer to i2c_master_handle_t structure which stores the transfer state.
  count | Number of bytes transferred so far by the non-blocking transaction.

Return values

  kStatus_InvalidArgument | count is Invalid.
  kStatus_Success | Successfully return the count.

void I2C_MasterTransferAbort | ( | I2C_Type * | base,
|  | i2c_master_handle_t * | handle
| ) |  |

Note
  This API can be called at any time when an interrupt non-blocking transfer initiates to abort the transfer early.

Parameters

  base | I2C base pointer.
  handle | pointer to i2c_master_handle_t structure which stores the transfer state

void I2C_MasterTransferHandleIRQ | ( | I2C_Type * | base,
|  | void * | i2cHandle
| ) |  |

Parameters

  base | I2C base pointer.
  i2cHandle | pointer to i2c_master_handle_t structure.

void I2C_SlaveTransferCreateHandle | ( | I2C_Type * | base,
|  | i2c_slave_handle_t * | handle,
|  | i2c_slave_transfer_callback_t | callback,
|  | void * | userData
| ) |  |

Parameters

  base | I2C base pointer.
  handle | pointer to i2c_slave_handle_t structure to store the transfer state.
  callback | pointer to user callback function.
  userData | user parameter passed to the callback function.

status_t I2C_SlaveTransferNonBlocking | ( | I2C_Type * | base,
|  | i2c_slave_handle_t * | handle,
|  | uint32_t | eventMask
| ) |  |

Call this API after calling the I2C_SlaveInit() and I2C_SlaveTransferCreateHandle() to start processing transactions driven by an I2C master. The slave monitors the I2C bus and passes events to the callback that was passed into the call to I2C_SlaveTransferCreateHandle(). The callback is always invoked from the interrupt context.

The set of events received by the callback is customizable. To do so, set the eventMask parameter to the OR'd combination of i2c_slave_transfer_event_t enumerators for the events you wish to receive. The kI2C_SlaveTransmitEvent and #kLPI2C_SlaveReceiveEvent events are always enabled and do not need to be included in the mask. Alternatively, pass 0 to get a default set of only the transmit and receive events that are always enabled. In addition, the kI2C_SlaveAllEvents constant is provided as a convenient way to enable all events.

Parameters

  base | The I2C peripheral base address.
  handle | Pointer to #i2c_slave_handle_t structure which stores the transfer state.
  eventMask | Bit mask formed by OR'ing together i2c_slave_transfer_event_t enumerators to specify which events to send to the callback. Other accepted values are 0 to get a default set of only the transmit and receive events, and kI2C_SlaveAllEvents to enable all events.

Return values

  #kStatus_Success | Slave transfers were successfully started.
  kStatus_I2C_Busy | Slave transfers have already been started on this handle.

void I2C_SlaveTransferAbort | ( | I2C_Type * | base,
|  | i2c_slave_handle_t * | handle
| ) |  |

Note
  This API can be called at any time to stop slave for handling the bus events.

Parameters

  base | I2C base pointer.
  handle | pointer to i2c_slave_handle_t structure which stores the transfer state.

status_t I2C_SlaveTransferGetCount | ( | I2C_Type * | base,
|  | i2c_slave_handle_t * | handle,
|  | size_t * | count
| ) |  |

Parameters

  base | I2C base pointer.
  handle | pointer to i2c_slave_handle_t structure.
  count | Number of bytes transferred so far by the non-blocking transaction.

Return values

  kStatus_InvalidArgument | count is Invalid.
  kStatus_Success | Successfully return the count.

void I2C_SlaveTransferHandleIRQ | ( | I2C_Type * | base,
|  | void * | i2cHandle
| ) |  |

Parameters

  base | I2C base pointer.
  i2cHandle | pointer to i2c_slave_handle_t structure which stores the transfer state