Lpuart_driver

Data Structures
struct	_lpuart_config
	LPUART configuration structure. More...
struct	_lpuart_transfer
	LPUART transfer structure. More...
struct	_lpuart_handle
	LPUART handle structure. More...

Variables
uint32_t	_lpuart_config::baudRate_Bps
lpuart_parity_mode_t	_lpuart_config::parityMode
lpuart_data_bits_t	_lpuart_config::dataBitsCount
bool	_lpuart_config::isMsb
lpuart_idle_type_select_t	_lpuart_config::rxIdleType
lpuart_idle_config_t	_lpuart_config::rxIdleConfig
bool	_lpuart_config::enableTx
bool	_lpuart_config::enableRx
uint8_t *   _lpuart_transfer::data
uint8_t *   _lpuart_transfer::rxData
const uint8_t *   _lpuart_transfer::txData
union {
uint8_t *   _lpuart_transfer::data
uint8_t *   _lpuart_transfer::rxData
const uint8_t *   _lpuart_transfer::txData
};
size_t	_lpuart_transfer::dataSize
const uint8_t *volatile	_lpuart_handle::txData
volatile size_t	_lpuart_handle::txDataSize
size_t	_lpuart_handle::txDataSizeAll
uint8_t *volatile	_lpuart_handle::rxData
volatile size_t	_lpuart_handle::rxDataSize
size_t	_lpuart_handle::rxDataSizeAll
uint8_t *	_lpuart_handle::rxRingBuffer
size_t	_lpuart_handle::rxRingBufferSize
volatile uint16_t	_lpuart_handle::rxRingBufferHead
volatile uint16_t	_lpuart_handle::rxRingBufferTail
lpuart_transfer_callback_t	_lpuart_handle::callback
void *	_lpuart_handle::userData
volatile uint8_t	_lpuart_handle::txState
volatile uint8_t	_lpuart_handle::rxState

Driver version
enum	{   kStatus_LPUART_TxBusy = MAKE_STATUS(kStatusGroup_LPUART, 0) , kStatus_LPUART_RxBusy = MAKE_STATUS(kStatusGroup_LPUART, 1) , kStatus_LPUART_TxIdle = MAKE_STATUS(kStatusGroup_LPUART, 2) , kStatus_LPUART_RxIdle = MAKE_STATUS(kStatusGroup_LPUART, 3) ,   kStatus_LPUART_TxWatermarkTooLarge = MAKE_STATUS(kStatusGroup_LPUART, 4) , kStatus_LPUART_RxWatermarkTooLarge = MAKE_STATUS(kStatusGroup_LPUART, 5) , kStatus_LPUART_FlagCannotClearManually = MAKE_STATUS(kStatusGroup_LPUART, 6) , kStatus_LPUART_Error = MAKE_STATUS(kStatusGroup_LPUART, 7) ,   kStatus_LPUART_RxRingBufferOverrun , kStatus_LPUART_RxHardwareOverrun = MAKE_STATUS(kStatusGroup_LPUART, 9) , kStatus_LPUART_NoiseError = MAKE_STATUS(kStatusGroup_LPUART, 10) , kStatus_LPUART_FramingError = MAKE_STATUS(kStatusGroup_LPUART, 11) ,   kStatus_LPUART_ParityError = MAKE_STATUS(kStatusGroup_LPUART, 12) , kStatus_LPUART_BaudrateNotSupport , kStatus_LPUART_IdleLineDetected = MAKE_STATUS(kStatusGroup_LPUART, 14) , kStatus_LPUART_Timeout = MAKE_STATUS(kStatusGroup_LPUART, 15) }
	Error codes for the LPUART driver. More...
enum	_lpuart_parity_mode { kLPUART_ParityDisabled = 0x0U , kLPUART_ParityEven = 0x2U , kLPUART_ParityOdd = 0x3U }
	LPUART parity mode. More...
enum	_lpuart_data_bits { kLPUART_EightDataBits = 0x0U }
	LPUART data bits count. More...
enum	_lpuart_stop_bit_count { kLPUART_OneStopBit = 0U , kLPUART_TwoStopBit = 1U }
	LPUART stop bit count. More...
enum	_lpuart_idle_type_select { kLPUART_IdleTypeStartBit = 0U , kLPUART_IdleTypeStopBit = 1U }
	LPUART idle flag type defines when the receiver starts counting. More...
enum	_lpuart_idle_config {   kLPUART_IdleCharacter1 = 0U , kLPUART_IdleCharacter2 = 1U , kLPUART_IdleCharacter4 = 2U , kLPUART_IdleCharacter8 = 3U ,   kLPUART_IdleCharacter16 = 4U , kLPUART_IdleCharacter32 = 5U , kLPUART_IdleCharacter64 = 6U , kLPUART_IdleCharacter128 = 7U }
	LPUART idle detected configuration. This structure defines the number of idle characters that must be received before the IDLE flag is set. More...
enum	_lpuart_interrupt_enable {   kLPUART_RxActiveEdgeInterruptEnable = (LPUART_BAUD_RXEDGIE_MASK >> 8U) , kLPUART_TxDataRegEmptyInterruptEnable = (LPUART_CTRL_TIE_MASK) , kLPUART_TransmissionCompleteInterruptEnable = (LPUART_CTRL_TCIE_MASK) , kLPUART_RxDataRegFullInterruptEnable = (LPUART_CTRL_RIE_MASK) ,   kLPUART_IdleLineInterruptEnable = (LPUART_CTRL_ILIE_MASK) , kLPUART_RxOverrunInterruptEnable = (LPUART_CTRL_ORIE_MASK) , kLPUART_NoiseErrorInterruptEnable = (LPUART_CTRL_NEIE_MASK) , kLPUART_FramingErrorInterruptEnable = (LPUART_CTRL_FEIE_MASK) ,   kLPUART_ParityErrorInterruptEnable = (LPUART_CTRL_PEIE_MASK) , kLPUART_AllInterruptEnable }
	LPUART interrupt configuration structure, default settings all disabled. More...
enum	_lpuart_flags {   kLPUART_TxDataRegEmptyFlag , kLPUART_TransmissionCompleteFlag , kLPUART_RxDataRegFullFlag = (LPUART_STAT_RDRF_MASK) , kLPUART_IdleLineFlag = (LPUART_STAT_IDLE_MASK) ,   kLPUART_RxOverrunFlag = (LPUART_STAT_OR_MASK) , kLPUART_NoiseErrorFlag = (LPUART_STAT_NF_MASK) , kLPUART_FramingErrorFlag , kLPUART_ParityErrorFlag = (LPUART_STAT_PF_MASK) ,   kLPUART_RxActiveEdgeFlag = (LPUART_STAT_RXEDGIF_MASK) , kLPUART_RxActiveFlag , kLPUART_AllClearFlags , kLPUART_AllFlags }
	LPUART status flags. More...
typedef enum _lpuart_parity_mode	lpuart_parity_mode_t
	LPUART parity mode.
typedef enum _lpuart_data_bits	lpuart_data_bits_t
	LPUART data bits count.
typedef enum _lpuart_stop_bit_count	lpuart_stop_bit_count_t
	LPUART stop bit count.
typedef enum _lpuart_idle_type_select	lpuart_idle_type_select_t
	LPUART idle flag type defines when the receiver starts counting.
typedef enum _lpuart_idle_config	lpuart_idle_config_t
	LPUART idle detected configuration. This structure defines the number of idle characters that must be received before the IDLE flag is set.
typedef struct _lpuart_config	lpuart_config_t
	LPUART configuration structure.
typedef struct _lpuart_transfer	lpuart_transfer_t
	LPUART transfer structure.
typedef struct _lpuart_handle	lpuart_handle_t
typedef void(*	lpuart_transfer_callback_t) (LPUART_Type *base, lpuart_handle_t *handle, status_t status, void *userData)
	LPUART transfer callback function.
typedef void(*	lpuart_isr_t) (LPUART_Type *base, void *handle)
void *	s_lpuartHandle []
const IRQn_Type	s_lpuartIRQ []
lpuart_isr_t	s_lpuartIsr []
#define	FSL_LPUART_DRIVER_VERSION   (MAKE_VERSION(2, 7, 0))
	LPUART driver version.
#define	UART_RETRY_TIMES   0U /* Defining to zero means to keep waiting for the flag until it is assert/deassert. */
	Retry times for waiting flag.

Initialization and deinitialization
status_t	LPUART_Init (LPUART_Type *base, const lpuart_config_t *config, uint32_t srcClock_Hz)
	Initializes an LPUART instance with the user configuration structure and the peripheral clock. More...
void	LPUART_Deinit (LPUART_Type *base)
	Deinitializes a LPUART instance. More...
void	LPUART_GetDefaultConfig (lpuart_config_t *config)
	Gets the default configuration structure. More...

Module configuration
status_t	LPUART_SetBaudRate (LPUART_Type *base, uint32_t baudRate_Bps, uint32_t srcClock_Hz)
	Sets the LPUART instance baudrate. More...
void	LPUART_Enable9bitMode (LPUART_Type *base, bool enable)
	Enable 9-bit data mode for LPUART. More...

Status
uint32_t	LPUART_GetStatusFlags (LPUART_Type *base)
	Gets LPUART status flags. More...
status_t	LPUART_ClearStatusFlags (LPUART_Type *base, uint32_t mask)
	Clears status flags with a provided mask. More...

Interrupts
void	LPUART_EnableInterrupts (LPUART_Type *base, uint32_t mask)
	Enables LPUART interrupts according to a provided mask. More...
void	LPUART_DisableInterrupts (LPUART_Type *base, uint32_t mask)
	Disables LPUART interrupts according to a provided mask. More...
uint32_t	LPUART_GetEnabledInterrupts (LPUART_Type *base)
	Gets enabled LPUART interrupts. More...

Bus Operations
uint32_t	LPUART_GetInstance (LPUART_Type *base)
	Get the LPUART instance from peripheral base address. More...
void	LPUART_SendAddress (LPUART_Type *base, uint8_t address)
	Transmit an address frame in 9-bit data mode. More...
status_t	LPUART_WriteBlocking (LPUART_Type *base, const uint8_t *data, size_t length)
	Writes to the transmitter register using a blocking method. More...
status_t	LPUART_ReadBlocking (LPUART_Type *base, uint8_t *data, size_t length)
	Reads the receiver data register using a blocking method. More...

Transactional
void	LPUART_TransferCreateHandle (LPUART_Type *base, lpuart_handle_t *handle, lpuart_transfer_callback_t callback, void *userData)
	Initializes the LPUART handle. More...
status_t	LPUART_TransferSendNonBlocking (LPUART_Type *base, lpuart_handle_t *handle, lpuart_transfer_t *xfer)
	Transmits a buffer of data using the interrupt method. More...
void	LPUART_TransferStartRingBuffer (LPUART_Type *base, lpuart_handle_t *handle, uint8_t *ringBuffer, size_t ringBufferSize)
	Sets up the RX ring buffer. More...
void	LPUART_TransferStopRingBuffer (LPUART_Type *base, lpuart_handle_t *handle)
	Aborts the background transfer and uninstalls the ring buffer. More...
size_t	LPUART_TransferGetRxRingBufferLength (LPUART_Type *base, lpuart_handle_t *handle)
	Get the length of received data in RX ring buffer. More...
void	LPUART_TransferAbortSend (LPUART_Type *base, lpuart_handle_t *handle)
	Aborts the interrupt-driven data transmit. More...
status_t	LPUART_TransferGetSendCount (LPUART_Type *base, lpuart_handle_t *handle, uint32_t *count)
	Gets the number of bytes that have been sent out to bus. More...
status_t	LPUART_TransferReceiveNonBlocking (LPUART_Type *base, lpuart_handle_t *handle, lpuart_transfer_t *xfer, size_t *receivedBytes)
	Receives a buffer of data using the interrupt method. More...
void	LPUART_TransferAbortReceive (LPUART_Type *base, lpuart_handle_t *handle)
	Aborts the interrupt-driven data receiving. More...
status_t	LPUART_TransferGetReceiveCount (LPUART_Type *base, lpuart_handle_t *handle, uint32_t *count)
	Gets the number of bytes that have been received. More...
void	LPUART_TransferHandleIRQ (LPUART_Type *base, void *irqHandle)
	LPUART IRQ handle function. More...
void	LPUART_TransferHandleErrorIRQ (LPUART_Type *base, void *irqHandle)
	LPUART Error IRQ handle function. More...

Detailed Description

Enumeration Type Documentation

anonymous enum

anonymous enum

Error codes for the LPUART driver.

Enumerator
kStatus_LPUART_TxBusy	TX busy
kStatus_LPUART_RxBusy	RX busy
kStatus_LPUART_TxIdle	LPUART transmitter is idle.
kStatus_LPUART_RxIdle	LPUART receiver is idle.
kStatus_LPUART_TxWatermarkTooLarge	TX FIFO watermark too large
kStatus_LPUART_RxWatermarkTooLarge	RX FIFO watermark too large
kStatus_LPUART_FlagCannotClearManually	Some flag can't manually clear
kStatus_LPUART_Error	Error happens on LPUART.
kStatus_LPUART_RxRingBufferOverrun	LPUART RX software ring buffer overrun.
kStatus_LPUART_RxHardwareOverrun	LPUART RX receiver overrun.
kStatus_LPUART_NoiseError	LPUART noise error.
kStatus_LPUART_FramingError	LPUART framing error.
kStatus_LPUART_ParityError	LPUART parity error.
kStatus_LPUART_BaudrateNotSupport	Baudrate is not support in current clock source
kStatus_LPUART_IdleLineDetected	IDLE flag.
kStatus_LPUART_Timeout	LPUART times out.

_lpuart_data_bits

enum _lpuart_data_bits

LPUART data bits count.

Enumerator
kLPUART_EightDataBits	Eight data bit

_lpuart_flags

enum _lpuart_flags

LPUART status flags.

This provides constants for the LPUART status flags for use in the LPUART functions.

Enumerator
kLPUART_TxDataRegEmptyFlag	Transmit data register empty flag, sets when transmit buffer is empty. bit 23
kLPUART_TransmissionCompleteFlag	Transmission complete flag, sets when transmission activity complete. bit 22
kLPUART_RxDataRegFullFlag	Receive data register full flag, sets when the receive data buffer is full. bit 21
kLPUART_IdleLineFlag	Idle line detect flag, sets when idle line detected. bit 20
kLPUART_RxOverrunFlag	Receive Overrun, sets when new data is received before data is read from receive register. bit 19
kLPUART_NoiseErrorFlag	Receive takes 3 samples of each received bit. If any of these samples differ, noise flag sets. bit 18
kLPUART_FramingErrorFlag	Frame error flag, sets if logic 0 was detected where stop bit expected. bit 17
kLPUART_ParityErrorFlag	If parity enabled, sets upon parity error detection. bit 16
kLPUART_RxActiveEdgeFlag	Receive pin active edge interrupt flag, sets when active edge detected. bit 30
kLPUART_RxActiveFlag	Receiver Active Flag (RAF), sets at beginning of valid start. bit 24

_lpuart_idle_config

enum _lpuart_idle_config

LPUART idle detected configuration. This structure defines the number of idle characters that must be received before the IDLE flag is set.

Enumerator
kLPUART_IdleCharacter1	the number of idle characters.
kLPUART_IdleCharacter2	the number of idle characters.
kLPUART_IdleCharacter4	the number of idle characters.
kLPUART_IdleCharacter8	the number of idle characters.
kLPUART_IdleCharacter16	the number of idle characters.
kLPUART_IdleCharacter32	the number of idle characters.
kLPUART_IdleCharacter64	the number of idle characters.
kLPUART_IdleCharacter128	the number of idle characters.

_lpuart_idle_type_select

enum _lpuart_idle_type_select

LPUART idle flag type defines when the receiver starts counting.

Enumerator
kLPUART_IdleTypeStartBit	Start counting after a valid start bit.
kLPUART_IdleTypeStopBit	Start counting after a stop bit.

_lpuart_interrupt_enable

enum _lpuart_interrupt_enable

LPUART interrupt configuration structure, default settings all disabled.

This structure contains the settings for all LPUART interrupt configurations.

Enumerator
kLPUART_RxActiveEdgeInterruptEnable	Receive Active Edge. bit 6
kLPUART_TxDataRegEmptyInterruptEnable	Transmit data register empty. bit 23
kLPUART_TransmissionCompleteInterruptEnable	Transmission complete. bit 22
kLPUART_RxDataRegFullInterruptEnable	Receiver data register full. bit 21
kLPUART_IdleLineInterruptEnable	Idle line. bit 20
kLPUART_RxOverrunInterruptEnable	Receiver Overrun. bit 27
kLPUART_NoiseErrorInterruptEnable	Noise error flag. bit 26
kLPUART_FramingErrorInterruptEnable	Framing error flag. bit 25
kLPUART_ParityErrorInterruptEnable	Parity error flag. bit 24

_lpuart_parity_mode

enum _lpuart_parity_mode

LPUART parity mode.

Enumerator
kLPUART_ParityDisabled	Parity disabled
kLPUART_ParityEven	Parity enabled, type even, bit setting: PE|PT = 10
kLPUART_ParityOdd	Parity enabled, type odd, bit setting: PE|PT = 11

_lpuart_stop_bit_count

enum _lpuart_stop_bit_count

LPUART stop bit count.

Enumerator
kLPUART_OneStopBit	One stop bit
kLPUART_TwoStopBit	Two stop bits

Function Documentation

LPUART_ClearStatusFlags()

status_t LPUART_ClearStatusFlags	(	LPUART_Type *	base,
		uint32_t	mask
	)

Clears status flags with a provided mask.

This function clears LPUART status flags with a provided mask. Automatically cleared flags can't be cleared by this function. Flags that can only cleared or set by hardware are: kLPUART_TxDataRegEmptyFlag, kLPUART_TransmissionCompleteFlag, kLPUART_RxDataRegFullFlag, kLPUART_RxActiveFlag, kLPUART_NoiseErrorFlag, kLPUART_ParityErrorFlag, kLPUART_TxFifoEmptyFlag,kLPUART_RxFifoEmptyFlag Note: This API should be called when the Tx/Rx is idle, otherwise it takes no effects.

Parameters

base	LPUART peripheral base address.
mask	the status flags to be cleared. The user can use the enumerators in the _lpuart_status_flag_t to do the OR operation and get the mask.

Returns

0 succeed, others failed.

Return values

kStatus_LPUART_FlagCannotClearManually	The flag can't be cleared by this function but it is cleared automatically by hardware.
kStatus_Success	Status in the mask are cleared.

brief Clears status flags with a provided mask.

This function clears LPUART status flags with a provided mask. Automatically cleared flags can't be cleared by this function. Flags that can only cleared or set by hardware are: kLPUART_TxDataRegEmptyFlag, kLPUART_TransmissionCompleteFlag, kLPUART_RxDataRegFullFlag, kLPUART_RxActiveFlag, kLPUART_NoiseErrorFlag, kLPUART_ParityErrorFlag, kLPUART_TxFifoEmptyFlag,kLPUART_RxFifoEmptyFlag Note: This API should be called when the Tx/Rx is idle, otherwise it takes no effects.

param base LPUART peripheral base address. param mask the status flags to be cleared. The user can use the enumerators in the _lpuart_status_flag_t to do the OR operation and get the mask. return 0 succeed, others failed. retval kStatus_LPUART_FlagCannotClearManually The flag can't be cleared by this function but it is cleared automatically by hardware. retval kStatus_Success Status in the mask are cleared.

LPUART_Deinit()

void LPUART_Deinit

(

LPUART_Type *

base

)

Deinitializes a LPUART instance.

This function waits for transmit to complete, disables TX and RX, and disables the LPUART clock.

Parameters

base	LPUART peripheral base address.

brief Deinitializes a LPUART instance.

This function waits for transmit to complete, disables TX and RX, and disables the LPUART clock.

param base LPUART peripheral base address.

LPUART_DisableInterrupts()

void LPUART_DisableInterrupts	(	LPUART_Type *	base,
		uint32_t	mask
	)

Disables LPUART interrupts according to a provided mask.

This function disables the LPUART interrupts according to a provided mask. The mask is a logical OR of enumeration members. See _lpuart_interrupt_enable. This example shows how to disable the TX empty interrupt and RX full interrupt:

LPUART_DisableInterrupts(LPUART1,kLPUART_TxDataRegEmptyInterruptEnable | kLPUART_RxDataRegFullInterruptEnable);

Parameters

base	LPUART peripheral base address.
mask	The interrupts to disable. Logical OR of _lpuart_interrupt_enable.

brief Disables LPUART interrupts according to a provided mask.

This function disables the LPUART interrupts according to a provided mask. The mask is a logical OR of enumeration members. See ref _lpuart_interrupt_enable. This example shows how to disable the TX empty interrupt and RX full interrupt: code LPUART_DisableInterrupts(LPUART1,kLPUART_TxDataRegEmptyInterruptEnable | kLPUART_RxDataRegFullInterruptEnable); endcode

param base LPUART peripheral base address. param mask The interrupts to disable. Logical OR of ref _lpuart_interrupt_enable.

LPUART_Enable9bitMode()

void LPUART_Enable9bitMode	(	LPUART_Type *	base,
		bool	enable
	)

Enable 9-bit data mode for LPUART.

This function set the 9-bit mode for LPUART module. The 9th bit is not used for parity thus can be modified by user.

Parameters

base	LPUART peripheral base address.
enable	true to enable, flase to disable.

brief Enable 9-bit data mode for LPUART.

This function set the 9-bit mode for LPUART module. The 9th bit is not used for parity thus can be modified by user.

param base LPUART peripheral base address. param enable true to enable, flase to disable.

LPUART_EnableInterrupts()

void LPUART_EnableInterrupts	(	LPUART_Type *	base,
		uint32_t	mask
	)

Enables LPUART interrupts according to a provided mask.

This function enables the LPUART interrupts according to a provided mask. The mask is a logical OR of enumeration members. See the _lpuart_interrupt_enable. This examples shows how to enable TX empty interrupt and RX full interrupt:

LPUART_EnableInterrupts(LPUART1,kLPUART_TxDataRegEmptyInterruptEnable | kLPUART_RxDataRegFullInterruptEnable);

Parameters

base	LPUART peripheral base address.
mask	The interrupts to enable. Logical OR of _lpuart_interrupt_enable.

brief Enables LPUART interrupts according to a provided mask.

This function enables the LPUART interrupts according to a provided mask. The mask is a logical OR of enumeration members. See the ref _lpuart_interrupt_enable. This examples shows how to enable TX empty interrupt and RX full interrupt: code LPUART_EnableInterrupts(LPUART1,kLPUART_TxDataRegEmptyInterruptEnable | kLPUART_RxDataRegFullInterruptEnable); endcode

param base LPUART peripheral base address. param mask The interrupts to enable. Logical OR of ref _lpuart_interrupt_enable.

LPUART_GetDefaultConfig()

void LPUART_GetDefaultConfig

(

lpuart_config_t *

config

)

Gets the default configuration structure.

This function initializes the LPUART configuration structure to a default value. The default values are: lpuartConfig->baudRate_Bps = 115200U; lpuartConfig->parityMode = kLPUART_ParityDisabled; lpuartConfig->dataBitsCount = kLPUART_EightDataBits; lpuartConfig->isMsb = false; lpuartConfig->stopBitCount = kLPUART_OneStopBit; lpuartConfig->txFifoWatermark = 0; lpuartConfig->rxFifoWatermark = 1; lpuartConfig->rxIdleType = kLPUART_IdleTypeStartBit; lpuartConfig->rxIdleConfig = kLPUART_IdleCharacter1; lpuartConfig->enableTx = false; lpuartConfig->enableRx = false;

Parameters

config

Pointer to a configuration structure.

brief Gets the default configuration structure.

This function initializes the LPUART configuration structure to a default value. The default values are: lpuartConfig->baudRate_Bps = 115200U; lpuartConfig->parityMode = kLPUART_ParityDisabled; lpuartConfig->dataBitsCount = kLPUART_EightDataBits; lpuartConfig->isMsb = false; lpuartConfig->stopBitCount = kLPUART_OneStopBit; lpuartConfig->txFifoWatermark = 0; lpuartConfig->rxFifoWatermark = 1; lpuartConfig->rxIdleType = kLPUART_IdleTypeStartBit; lpuartConfig->rxIdleConfig = kLPUART_IdleCharacter1; lpuartConfig->enableTx = false; lpuartConfig->enableRx = false;

param config Pointer to a configuration structure.

LPUART_GetEnabledInterrupts()

uint32_t LPUART_GetEnabledInterrupts

(

LPUART_Type *

base

)

Gets enabled LPUART interrupts.

This function gets the enabled LPUART interrupts. The enabled interrupts are returned as the logical OR value of the enumerators _lpuart_interrupt_enable. To check a specific interrupt enable status, compare the return value with enumerators in _lpuart_interrupt_enable. For example, to check whether the TX empty interrupt is enabled:

uint32_t enabledInterrupts = LPUART_GetEnabledInterrupts(LPUART1);
 
if (kLPUART_TxDataRegEmptyInterruptEnable & enabledInterrupts)
{
    ...
}

Parameters

base	LPUART peripheral base address.

Returns

LPUART interrupt flags which are logical OR of the enumerators in _lpuart_interrupt_enable.

brief Gets enabled LPUART interrupts.

This function gets the enabled LPUART interrupts. The enabled interrupts are returned as the logical OR value of the enumerators ref _lpuart_interrupt_enable. To check a specific interrupt enable status, compare the return value with enumerators in ref _lpuart_interrupt_enable. For example, to check whether the TX empty interrupt is enabled: code uint32_t enabledInterrupts = LPUART_GetEnabledInterrupts(LPUART1);

if (kLPUART_TxDataRegEmptyInterruptEnable & enabledInterrupts) { ... } endcode

param base LPUART peripheral base address. return LPUART interrupt flags which are logical OR of the enumerators in ref _lpuart_interrupt_enable.

LPUART_GetInstance()

uint32_t LPUART_GetInstance

(

LPUART_Type *

base

)

Get the LPUART instance from peripheral base address.

Parameters

base	LPUART peripheral base address.

Returns

LPUART instance.

brief Get the LPUART instance from peripheral base address.

param base LPUART peripheral base address. return LPUART instance.

LPUART_GetStatusFlags()

uint32_t LPUART_GetStatusFlags

(

LPUART_Type *

base

)

Gets LPUART status flags.

This function gets all LPUART status flags. The flags are returned as the logical OR value of the enumerators _lpuart_flags. To check for a specific status, compare the return value with enumerators in the _lpuart_flags. For example, to check whether the TX is empty:

if (kLPUART_TxDataRegEmptyFlag & LPUART_GetStatusFlags(LPUART1))
{
    ...
}

Parameters

base	LPUART peripheral base address.

Returns

LPUART status flags which are ORed by the enumerators in the _lpuart_flags.

brief Gets LPUART status flags.

This function gets all LPUART status flags. The flags are returned as the logical OR value of the enumerators ref _lpuart_flags. To check for a specific status, compare the return value with enumerators in the ref _lpuart_flags. For example, to check whether the TX is empty: code if (kLPUART_TxDataRegEmptyFlag & LPUART_GetStatusFlags(LPUART1)) { ... } endcode

param base LPUART peripheral base address. return LPUART status flags which are ORed by the enumerators in the _lpuart_flags.

LPUART_Init()

status_t LPUART_Init	(	LPUART_Type *	base,
		const lpuart_config_t *	config,
		uint32_t	srcClock_Hz
	)

Initializes an LPUART instance with the user configuration structure and the peripheral clock.

This function configures the LPUART module with user-defined settings. Call the LPUART_GetDefaultConfig() function to configure the configuration structure and get the default configuration. The example below shows how to use this API to configure the LPUART.

lpuart_config_t lpuartConfig;
lpuartConfig.baudRate_Bps = 115200U;
lpuartConfig.parityMode = kLPUART_ParityDisabled;
lpuartConfig.dataBitsCount = kLPUART_EightDataBits;
lpuartConfig.isMsb = false;
lpuartConfig.stopBitCount = kLPUART_OneStopBit;
lpuartConfig.txFifoWatermark = 0;
lpuartConfig.rxFifoWatermark = 1;
LPUART_Init(LPUART1, &lpuartConfig, 20000000U);

Parameters

base	LPUART peripheral base address.
config	Pointer to a user-defined configuration structure.
srcClock_Hz	LPUART clock source frequency in HZ.

Return values

kStatus_LPUART_BaudrateNotSupport	Baudrate is not support in current clock source.
kStatus_Success	LPUART initialize succeed

brief Initializes an LPUART instance with the user configuration structure and the peripheral clock.

This function configures the LPUART module with user-defined settings. Call the LPUART_GetDefaultConfig() function to configure the configuration structure and get the default configuration. The example below shows how to use this API to configure the LPUART. code lpuart_config_t lpuartConfig; lpuartConfig.baudRate_Bps = 115200U; lpuartConfig.parityMode = kLPUART_ParityDisabled; lpuartConfig.dataBitsCount = kLPUART_EightDataBits; lpuartConfig.isMsb = false; lpuartConfig.stopBitCount = kLPUART_OneStopBit; lpuartConfig.txFifoWatermark = 0; lpuartConfig.rxFifoWatermark = 1; LPUART_Init(LPUART1, &lpuartConfig, 20000000U); endcode

param base LPUART peripheral base address. param config Pointer to a user-defined configuration structure. param srcClock_Hz LPUART clock source frequency in HZ. retval kStatus_LPUART_BaudrateNotSupport Baudrate is not support in current clock source. retval kStatus_Success LPUART initialize succeed

LPUART_ReadBlocking()

status_t LPUART_ReadBlocking	(	LPUART_Type *	base,
		uint8_t *	data,
		size_t	length
	)

Reads the receiver data register using a blocking method.

This function polls the receiver register, waits for the receiver register full or receiver FIFO has data, and reads data from the TX register.

Parameters

base	LPUART peripheral base address.
data	Start address of the buffer to store the received data.
length	Size of the buffer.

Return values

kStatus_LPUART_RxHardwareOverrun	Receiver overrun happened while receiving data.
kStatus_LPUART_NoiseError	Noise error happened while receiving data.
kStatus_LPUART_FramingError	Framing error happened while receiving data.
kStatus_LPUART_ParityError	Parity error happened while receiving data.
kStatus_LPUART_Timeout	Transmission timed out and was aborted.
kStatus_Success	Successfully received all data.

brief Reads the receiver data register using a blocking method.

This function polls the receiver register, waits for the receiver register full or receiver FIFO has data, and reads data from the TX register.

param base LPUART peripheral base address. param data Start address of the buffer to store the received data. param length Size of the buffer. retval kStatus_LPUART_RxHardwareOverrun Receiver overrun happened while receiving data. retval kStatus_LPUART_NoiseError Noise error happened while receiving data. retval kStatus_LPUART_FramingError Framing error happened while receiving data. retval kStatus_LPUART_ParityError Parity error happened while receiving data. retval kStatus_LPUART_Timeout Transmission timed out and was aborted. retval kStatus_Success Successfully received all data.

LPUART_SendAddress()

void LPUART_SendAddress	(	LPUART_Type *	base,
		uint8_t	address
	)

Transmit an address frame in 9-bit data mode.

Parameters

base	LPUART peripheral base address.
address	LPUART slave address.

brief Transmit an address frame in 9-bit data mode.

param base LPUART peripheral base address. param address LPUART slave address.

LPUART_SetBaudRate()

status_t LPUART_SetBaudRate	(	LPUART_Type *	base,
		uint32_t	baudRate_Bps,
		uint32_t	srcClock_Hz
	)

Sets the LPUART instance baudrate.

This function configures the LPUART module baudrate. This function is used to update the LPUART module baudrate after the LPUART module is initialized by the LPUART_Init.

LPUART_SetBaudRate(LPUART1, 115200U, 20000000U);

Parameters

base	LPUART peripheral base address.
baudRate_Bps	LPUART baudrate to be set.
srcClock_Hz	LPUART clock source frequency in HZ.

Return values

kStatus_LPUART_BaudrateNotSupport	Baudrate is not supported in the current clock source.
kStatus_Success	Set baudrate succeeded.

brief Sets the LPUART instance baudrate.

This function configures the LPUART module baudrate. This function is used to update the LPUART module baudrate after the LPUART module is initialized by the LPUART_Init. code LPUART_SetBaudRate(LPUART1, 115200U, 20000000U); endcode

param base LPUART peripheral base address. param baudRate_Bps LPUART baudrate to be set. param srcClock_Hz LPUART clock source frequency in HZ. retval kStatus_LPUART_BaudrateNotSupport Baudrate is not supported in the current clock source. retval kStatus_Success Set baudrate succeeded.

LPUART_TransferAbortReceive()

void LPUART_TransferAbortReceive	(	LPUART_Type *	base,
		lpuart_handle_t *	handle
	)

Aborts the interrupt-driven data receiving.

This function aborts the interrupt-driven data receiving. The user can get the remainBytes to find out how many bytes not received yet.

Parameters

base	LPUART peripheral base address.
handle	LPUART handle pointer.

brief Aborts the interrupt-driven data receiving.

This function aborts the interrupt-driven data receiving. The user can get the remainBytes to find out how many bytes not received yet.

param base LPUART peripheral base address. param handle LPUART handle pointer.

LPUART_TransferAbortSend()

void LPUART_TransferAbortSend	(	LPUART_Type *	base,
		lpuart_handle_t *	handle
	)

Aborts the interrupt-driven data transmit.

This function aborts the interrupt driven data sending. The user can get the remainBtyes to find out how many bytes are not sent out.

Parameters

base	LPUART peripheral base address.
handle	LPUART handle pointer.

brief Aborts the interrupt-driven data transmit.

This function aborts the interrupt driven data sending. The user can get the remainBtyes to find out how many bytes are not sent out.

param base LPUART peripheral base address. param handle LPUART handle pointer.

LPUART_TransferCreateHandle()

void LPUART_TransferCreateHandle	(	LPUART_Type *	base,
		lpuart_handle_t *	handle,
		lpuart_transfer_callback_t	callback,
		void *	userData
	)

Initializes the LPUART handle.

This function initializes the LPUART handle, which can be used for other LPUART transactional APIs. Usually, for a specified LPUART instance, call this API once to get the initialized handle.

The LPUART driver supports the "background" receiving, which means that user can set up an RX ring buffer optionally. Data received is stored into the ring buffer even when the user doesn't call the LPUART_TransferReceiveNonBlocking() API. If there is already data received in the ring buffer, the user can get the received data from the ring buffer directly. The ring buffer is disabled if passing NULL as ringBuffer.

Parameters

base	LPUART peripheral base address.
handle	LPUART handle pointer.
callback	Callback function.
userData	User data.

brief Initializes the LPUART handle.

This function initializes the LPUART handle, which can be used for other LPUART transactional APIs. Usually, for a specified LPUART instance, call this API once to get the initialized handle.

The LPUART driver supports the "background" receiving, which means that user can set up an RX ring buffer optionally. Data received is stored into the ring buffer even when the user doesn't call the LPUART_TransferReceiveNonBlocking() API. If there is already data received in the ring buffer, the user can get the received data from the ring buffer directly. The ring buffer is disabled if passing NULL as p ringBuffer.

param base LPUART peripheral base address. param handle LPUART handle pointer. param callback Callback function. param userData User data.

LPUART_TransferGetReceiveCount()

status_t LPUART_TransferGetReceiveCount	(	LPUART_Type *	base,
		lpuart_handle_t *	handle,
		uint32_t *	count
	)

Gets the number of bytes that have been received.

This function gets the number of bytes that have been received.

Parameters

base	LPUART peripheral base address.
handle	LPUART handle pointer.
count	Receive bytes count.

Return values

kStatus_NoTransferInProgress	No receive in progress.
kStatus_InvalidArgument	Parameter is invalid.
kStatus_Success	Get successfully through the parameter count;

brief Gets the number of bytes that have been received.

This function gets the number of bytes that have been received.

param base LPUART peripheral base address. param handle LPUART handle pointer. param count Receive bytes count. retval kStatus_NoTransferInProgress No receive in progress. retval kStatus_InvalidArgument Parameter is invalid. retval kStatus_Success Get successfully through the parameter count;

LPUART_TransferGetRxRingBufferLength()

size_t LPUART_TransferGetRxRingBufferLength	(	LPUART_Type *	base,
		lpuart_handle_t *	handle
	)

Get the length of received data in RX ring buffer.

Parameters

base	LPUART peripheral base address.
handle	LPUART handle pointer.

Returns

Length of received data in RX ring buffer.

brief Get the length of received data in RX ring buffer.

userData handle LPUART handle pointer. return Length of received data in RX ring buffer.

LPUART_TransferGetSendCount()

status_t LPUART_TransferGetSendCount	(	LPUART_Type *	base,
		lpuart_handle_t *	handle,
		uint32_t *	count
	)

Gets the number of bytes that have been sent out to bus.

This function gets the number of bytes that have been sent out to bus by an interrupt method.

Parameters

base	LPUART peripheral base address.
handle	LPUART handle pointer.
count	Send bytes count.

Return values

kStatus_NoTransferInProgress	No send in progress.
kStatus_InvalidArgument	Parameter is invalid.
kStatus_Success	Get successfully through the parameter count;

brief Gets the number of bytes that have been sent out to bus.

This function gets the number of bytes that have been sent out to bus by an interrupt method.

param base LPUART peripheral base address. param handle LPUART handle pointer. param count Send bytes count. retval kStatus_NoTransferInProgress No send in progress. retval kStatus_InvalidArgument Parameter is invalid. retval kStatus_Success Get successfully through the parameter count;

LPUART_TransferHandleErrorIRQ()

void LPUART_TransferHandleErrorIRQ	(	LPUART_Type *	base,
		void *	irqHandle
	)

LPUART Error IRQ handle function.

This function handles the LPUART error IRQ request.

Parameters

base	LPUART peripheral base address.
irqHandle	LPUART handle pointer.

brief LPUART Error IRQ handle function.

This function handles the LPUART error IRQ request.

param base LPUART peripheral base address. param irqHandle LPUART handle pointer.

LPUART_TransferHandleIRQ()

void LPUART_TransferHandleIRQ	(	LPUART_Type *	base,
		void *	irqHandle
	)

LPUART IRQ handle function.

This function handles the LPUART transmit and receive IRQ request.

Parameters

base	LPUART peripheral base address.
irqHandle	LPUART handle pointer.

brief LPUART IRQ handle function.

This function handles the LPUART transmit and receive IRQ request.

param base LPUART peripheral base address. param irqHandle LPUART handle pointer.

LPUART_TransferReceiveNonBlocking()

status_t LPUART_TransferReceiveNonBlocking	(	LPUART_Type *	base,
		lpuart_handle_t *	handle,
		lpuart_transfer_t *	xfer,
		size_t *	receivedBytes
	)

Receives a buffer of data using the interrupt method.

This function receives data using an interrupt method. This is a non-blocking function which returns without waiting to ensure that all data are received. If the RX ring buffer is used and not empty, the data in the ring buffer is copied and the parameter receivedBytes shows how many bytes are copied from the ring buffer. After copying, if the data in the ring buffer is not enough for read, the receive request is saved by the LPUART driver. When the new data arrives, the receive request is serviced first. When all data is received, the LPUART driver notifies the upper layer through a callback function and passes a status parameter kStatus_UART_RxIdle. For example, the upper layer needs 10 bytes but there are only 5 bytes in ring buffer. The 5 bytes are copied to xfer->data, which returns with the parameter receivedBytes set to 5. For the remaining 5 bytes, the newly arrived data is saved from xfer->data[5]. When 5 bytes are received, the LPUART driver notifies the upper layer. If the RX ring buffer is not enabled, this function enables the RX and RX interrupt to receive data to xfer->data. When all data is received, the upper layer is notified.

Parameters

base	LPUART peripheral base address.
handle	LPUART handle pointer.
xfer	LPUART transfer structure, see uart_transfer_t.
receivedBytes	Bytes received from the ring buffer directly.

Return values

kStatus_Success	Successfully queue the transfer into the transmit queue.
kStatus_LPUART_RxBusy	Previous receive request is not finished.
kStatus_InvalidArgument	Invalid argument.

brief Receives a buffer of data using the interrupt method.

This function receives data using an interrupt method. This is a non-blocking function which returns without waiting to ensure that all data are received. If the RX ring buffer is used and not empty, the data in the ring buffer is copied and the parameter p receivedBytes shows how many bytes are copied from the ring buffer. After copying, if the data in the ring buffer is not enough for read, the receive request is saved by the LPUART driver. When the new data arrives, the receive request is serviced first. When all data is received, the LPUART driver notifies the upper layer through a callback function and passes a status parameter ref kStatus_UART_RxIdle. For example, the upper layer needs 10 bytes but there are only 5 bytes in ring buffer. The 5 bytes are copied to xfer->data, which returns with the parameter p receivedBytes set to 5. For the remaining 5 bytes, the newly arrived data is saved from xfer->data[5]. When 5 bytes are received, the LPUART driver notifies the upper layer. If the RX ring buffer is not enabled, this function enables the RX and RX interrupt to receive data to xfer->data. When all data is received, the upper layer is notified.

param base LPUART peripheral base address. param handle LPUART handle pointer. param xfer LPUART transfer structure, see #uart_transfer_t. param receivedBytes Bytes received from the ring buffer directly. retval kStatus_Success Successfully queue the transfer into the transmit queue. retval kStatus_LPUART_RxBusy Previous receive request is not finished. retval kStatus_InvalidArgument Invalid argument.

LPUART_TransferSendNonBlocking()

status_t LPUART_TransferSendNonBlocking	(	LPUART_Type *	base,
		lpuart_handle_t *	handle,
		lpuart_transfer_t *	xfer
	)

Transmits a buffer of data using the interrupt method.

This function send data using an interrupt method. This is a non-blocking function, which returns directly without waiting for all data written to the transmitter register. When all data is written to the TX register in the ISR, the LPUART driver calls the callback function and passes the kStatus_LPUART_TxIdle as status parameter.

Note

The kStatus_LPUART_TxIdle is passed to the upper layer when all data are written to the TX register. However, there is no check to ensure that all the data sent out. Before disabling the TX, check the kLPUART_TransmissionCompleteFlag to ensure that the transmit is finished.

Parameters

base	LPUART peripheral base address.
handle	LPUART handle pointer.
xfer	LPUART transfer structure, see lpuart_transfer_t.

Return values

kStatus_Success	Successfully start the data transmission.
kStatus_LPUART_TxBusy	Previous transmission still not finished, data not all written to the TX register.
kStatus_InvalidArgument	Invalid argument.

brief Transmits a buffer of data using the interrupt method.

This function send data using an interrupt method. This is a non-blocking function, which returns directly without waiting for all data written to the transmitter register. When all data is written to the TX register in the ISR, the LPUART driver calls the callback function and passes the ref kStatus_LPUART_TxIdle as status parameter.

note The kStatus_LPUART_TxIdle is passed to the upper layer when all data are written to the TX register. However, there is no check to ensure that all the data sent out. Before disabling the TX, check the kLPUART_TransmissionCompleteFlag to ensure that the transmit is finished.

param base LPUART peripheral base address. param handle LPUART handle pointer. param xfer LPUART transfer structure, see lpuart_transfer_t. retval kStatus_Success Successfully start the data transmission. retval kStatus_LPUART_TxBusy Previous transmission still not finished, data not all written to the TX register. retval kStatus_InvalidArgument Invalid argument.

LPUART_TransferStartRingBuffer()

void LPUART_TransferStartRingBuffer	(	LPUART_Type *	base,
		lpuart_handle_t *	handle,
		uint8_t *	ringBuffer,
		size_t	ringBufferSize
	)

Sets up the RX ring buffer.

This function sets up the RX ring buffer to a specific UART handle.

When the RX ring buffer is used, data received is stored into the ring buffer even when the user doesn't call the UART_TransferReceiveNonBlocking() API. If there is already data received in the ring buffer, the user can get the received data from the ring buffer directly.

Note

When using RX ring buffer, one byte is reserved for internal use. In other words, if ringBufferSize is 32, then only 31 bytes are used for saving data.

Parameters

base	LPUART peripheral base address.
handle	LPUART handle pointer.
ringBuffer	Start address of ring buffer for background receiving. Pass NULL to disable the ring buffer.
ringBufferSize	size of the ring buffer.

brief Sets up the RX ring buffer.

This function sets up the RX ring buffer to a specific UART handle.

When the RX ring buffer is used, data received is stored into the ring buffer even when the user doesn't call the UART_TransferReceiveNonBlocking() API. If there is already data received in the ring buffer, the user can get the received data from the ring buffer directly.

note When using RX ring buffer, one byte is reserved for internal use. In other words, if p ringBufferSize is 32, then only 31 bytes are used for saving data.

param base LPUART peripheral base address. param handle LPUART handle pointer. param ringBuffer Start address of ring buffer for background receiving. Pass NULL to disable the ring buffer. param ringBufferSize size of the ring buffer.

LPUART_TransferStopRingBuffer()

void LPUART_TransferStopRingBuffer	(	LPUART_Type *	base,
		lpuart_handle_t *	handle
	)

Aborts the background transfer and uninstalls the ring buffer.

This function aborts the background transfer and uninstalls the ring buffer.

Parameters

base	LPUART peripheral base address.
handle	LPUART handle pointer.

brief Aborts the background transfer and uninstalls the ring buffer.

This function aborts the background transfer and uninstalls the ring buffer.

param base LPUART peripheral base address. param handle LPUART handle pointer.

LPUART_WriteBlocking()

status_t LPUART_WriteBlocking	(	LPUART_Type *	base,
		const uint8_t *	data,
		size_t	length
	)

Writes to the transmitter register using a blocking method.

This function polls the transmitter register, first waits for the register to be empty or TX FIFO to have room, and writes data to the transmitter buffer, then waits for the dat to be sent out to the bus.

Parameters

base	LPUART peripheral base address.
data	Start address of the data to write.
length	Size of the data to write.

Return values

kStatus_LPUART_Timeout	Transmission timed out and was aborted.
kStatus_Success	Successfully wrote all data.

brief Writes to the transmitter register using a blocking method.

This function polls the transmitter register, first waits for the register to be empty or TX FIFO to have room, and writes data to the transmitter buffer, then waits for the data to be sent out to bus.

param base LPUART peripheral base address. param data Start address of the data to write. param length Size of the data to write. retval kStatus_LPUART_Timeout Transmission timed out and was aborted. retval kStatus_Success Successfully wrote all data.

Variable Documentation

baudRate_Bps

uint32_t _lpuart_config::baudRate_Bps

LPUART baud rate

callback

lpuart_transfer_callback_t _lpuart_handle::callback

Callback function.

data [1/2]

uint8_t* _lpuart_transfer::data

The buffer of data to be transfer.

[2/2]

uint8_t* { ... } ::data

The buffer of data to be transfer.

dataBitsCount

lpuart_data_bits_t _lpuart_config::dataBitsCount

Data bits count, eight (default), seven

dataSize

size_t _lpuart_transfer::dataSize

The byte count to be transfer.

enableRx

bool _lpuart_config::enableRx

Enable RX

enableTx

bool _lpuart_config::enableTx

Enable TX

isMsb

bool _lpuart_config::isMsb

Data bits order, LSB (default), MSB

parityMode

lpuart_parity_mode_t _lpuart_config::parityMode

Parity mode, disabled (default), even, odd

rxData [1/3]

uint8_t* _lpuart_transfer::rxData

The buffer to receive data.

[2/3]

uint8_t* { ... } ::rxData

The buffer to receive data.

rxData [3/3]

uint8_t* volatile _lpuart_handle::rxData

Address of remaining data to receive.

rxDataSize

volatile size_t _lpuart_handle::rxDataSize

Size of the remaining data to receive.

rxDataSizeAll

size_t _lpuart_handle::rxDataSizeAll

Size of the data to receive.

rxIdleConfig

lpuart_idle_config_t _lpuart_config::rxIdleConfig

RX IDLE configuration.

rxIdleType

lpuart_idle_type_select_t _lpuart_config::rxIdleType

RX IDLE type.

rxRingBuffer

uint8_t* _lpuart_handle::rxRingBuffer

Start address of the receiver ring buffer.

rxRingBufferHead

volatile uint16_t _lpuart_handle::rxRingBufferHead

Index for the driver to store received data into ring buffer.

rxRingBufferSize

size_t _lpuart_handle::rxRingBufferSize

Size of the ring buffer.

rxRingBufferTail

volatile uint16_t _lpuart_handle::rxRingBufferTail

Index for the user to get data from the ring buffer.

rxState

volatile uint8_t _lpuart_handle::rxState

RX transfer state.

[1/3]

const uint8_t* { ... } ::txData

The buffer of data to be sent.

txData [2/3]

const uint8_t* _lpuart_transfer::txData

The buffer of data to be sent.

txData [3/3]

const uint8_t* volatile _lpuart_handle::txData

Address of remaining data to send.

txDataSize

volatile size_t _lpuart_handle::txDataSize

Size of the remaining data to send.

txDataSizeAll

size_t _lpuart_handle::txDataSizeAll

Size of the data to send out.

txState

volatile uint8_t _lpuart_handle::txState

TX transfer state.

userData

void* _lpuart_handle::userData

LPUART callback function parameter.