LIN (r_sau_lin)

Functions
fsp_err_t	R_SAU_LIN_Open (lin_ctrl_t *const p_api_ctrl, lin_cfg_t const *const p_cfg)
fsp_err_t	R_SAU_LIN_Write (lin_ctrl_t *const p_api_ctrl, const lin_transfer_params_t *const p_transfer_params)
fsp_err_t	R_SAU_LIN_Read (lin_ctrl_t *const p_api_ctrl, lin_transfer_params_t *const p_transfer_params)
fsp_err_t	R_SAU_LIN_CommunicationAbort (lin_ctrl_t *const p_api_ctrl)
fsp_err_t	R_SAU_LIN_CallbackSet (lin_ctrl_t *const p_api_ctrl, void(*p_callback)(lin_callback_args_t *), void *const p_context, lin_callback_args_t *const p_callback_memory)
fsp_err_t	R_SAU_LIN_WakeupSend (lin_ctrl_t *const p_api_ctrl)
fsp_err_t	R_SAU_LIN_SleepEnter (lin_ctrl_t *const p_api_ctrl)
fsp_err_t	R_SAU_LIN_SleepExit (lin_ctrl_t *const p_api_ctrl)
fsp_err_t	R_SAU_LIN_Close (lin_ctrl_t *const p_api_ctrl)
fsp_err_t	R_SAU_LIN_InformationFrameRead (lin_ctrl_t *const p_api_ctrl, lin_transfer_params_t *const p_transfer_params)
fsp_err_t	R_SAU_LIN_StartFrameWrite (lin_ctrl_t *const p_api_ctrl, uint8_t const id)
fsp_err_t	R_SAU_LIN_InformationFrameWrite (lin_ctrl_t *const p_api_ctrl, const lin_transfer_params_t *const p_transfer_params)

Detailed Description

LIN driver for the SAU peripheral on RA MCUs. This module implements the LIN Interface.

Overview

SAU LIN supports Local Interface Network (LIN) transactions in master or slave mode. A callback must be provided, and is invoked when a transmission, reception, or other event has completed or occurred. The callback arguments contain information about the transaction status, bytes transferred and a pointer to the user-defined context.

The SAU LIN driver uses the SAU UART, TAU, and ICU peripherals to implement LIN communication.

Features

• Half-duplex master or slave mode LIN communication
• Interrupt-driven data transmission and reception
• Optional LIN wake-up signal transmission and detection
• Generation of the sync (0x55) and Protected Identifier fields when in master mode
• Validation of the Protected Identifier field when in slave mode
• Optional checksum generation/validation using classic or enhanced LIN checksum
• Auto synchronization during sync byte reception is supported in slave mode
• Invoking the user-callback function with an event code (RX/TX complete, error, etc)
• Abort in-progress read/write operations
• Error notifications of parity error in protected identifier, framing error and overrun error
• Optional integration with the DTC transfer module

Configuration

Build Time Configurations for r_sau_lin

The following build time configurations are defined in fsp_cfg/r_sau_lin_cfg.h:

Configuration	Options	Default	Description
Parameter Checking	Default (BSP) Enabled Disabled	Default (BSP)	If selected code for parameter checking is included in the build.
Checksum Support	Enabled Disabled	Enabled	When set to 'Disabled', code for checksum generation and validation is excluded from the build. Disable only when checksum generation and validation is not required for any LIN instance.
Master Support	Enabled Disabled	Disabled	Select whether code for master support is included in the build.
Slave Support	Enabled Disabled	Enabled	Select whether code for slave support is included in the build.
Wake-up Support	Enabled Disabled	Disabled	Select whether code for LIN bus sleep and wake-up signal detection is included in the build. Enable when at least one LIN instance requires sleep/wake-up support.
Auto Synchronization Support	Enabled Disabled	Enabled	When set to 'Disabled', code for auto synchronization is excluded from the build. Enable when at least one LIN slave instance is using auto synchronization.

Configurations for Connectivity > LIN (r_sau_lin)

This module can be added to the Stacks tab via New Stack > Connectivity > LIN (r_sau_lin).

Configuration	Options	Default	Description
Name	Name must be a valid C symbol	g_lin0	Module name.
Mode	Master Slave	Slave	Select the LIN mode.
Callback	Name must be a valid C symbol	sau_lin0_callback	A user callback function must be provided. It will be called from the interrupt service routine (ISR) in order to notify the application of LIN transmission/reception events and errors.
UART Channel	MCU Specific Options		Select the LIN UART Channel.
TAU Channel	MCU Specific Options		Select the LIN TAU Channel.
ICU Channel	MCU Specific Options		Select the LIN ICU Channel.
Baud Rate	Value must be an integer greater than 0	19200	Select the LIN Baudrate.
Auto Synchronization	Disable Enable	Enable	Enable LIN synchronization to the master's clock by measuring pulse intervals between the falling edges of the input signal from the RXDn pin during reception of the LIN sync byte.

Clock Configuration

In both master and slave modes, the SAU UART operation clock can be selected from the available operation clocks for the SAU unit.

In slave mode, the TAU operation clock can be selected from the available operation clocks for the TAU channel.

For more information about module clock settings, please refer to the clock setting of UART (r_sau_uart) and Independent Channel, 16-bit and 8-bit timer (r_tau).

Pin Configuration

This module uses TXD and RXD to communicate to external devices. Connect TXD and RXD to an on-board or external LIN transceiver for LIN bus communication.

An external pull up resistor is required on TXD in both master and slave modes.

Dependent Module Configuration

SAU UART Module Configuration

• Disable 'Common > Enable Fixed Baudrate'
• Configure 'Interrupts > Transmit End Interrupt Priority' and 'Interrupts > Receive End Interrupt Priority'
• 'Interrupts > Error Interrupt Priority' is optional, but framing and overflow errors cannot be detected unless it is enabled.

TAU Module Configuration

TAU is not used in master mode. In slave mode:

• Enable 'Common > Pin Input Support'
• Enable 'Common > Extra Input Mode Support'
• Configure 'Interrupts > Interrupt Priority'

ICU Module Configuration

ICU is only required if using bus wake-up functionality (R_SAU_LIN_WakeupSend, R_SAU_LIN_SleepEnter, R_SAU_LIN_SleepExit).

• Configure ICU 'Pin Interrupt' priority when the ICU module is used.

Usage Notes

LIN Transmission and Reception

SAU LIN data reception is disabled until a LIN header is received (slave mode) or a call to R_SAU_LIN_Read() is made (master mode).

Slave Mode Transmission and Reception

The header is detected in slave mode only. Header reception is interrupt driven, and is enabled after a successful call to R_SAU_LIN_Open() in slave mode.

When the LIN break field is detected by the slave node, header reception begins without action from the application. When header reception completes, the user callback is called.

If the slave node needs to receive a data frame, it must call R_SAU_LIN_Read() before the first data is received in order to receive the data. The user callback is called when reception is complete. It is permitted to call R_SAU_LIN_Read() from the callback context.

If the master node needs to publish a response to its own header, the master node must call R_SAU_LIN_Write() and provide a pointer to the response data. The response will be published following the header. The user callback is called when the full frame transmission is complete.

If the slave node neither needs to receive the data frame, nor publish a response for a received header, no action is required to ignore the frame.

Master Mode Transmission and Reception

The header is not detected in master mode. Data frame reception is enabled only after a call to R_SAU_LIN_Read().

A header-only frame can be transmitted by calling R_SAU_LIN_Write() with a NULL data pointer. The user callback is called when transmission is complete.

If the master node needs to receive the data response, call R_SAU_LIN_Read() after header transmission has completed and before the first data is received. It is permitted to call R_SAU_LIN_Read() from the callback context.

If the master node needs to publish a response to its own header, the master node must call R_SAU_LIN_Write() with a non-NULL data pointer. The response will be published following the header. The user callback is called when the full frame transmission is complete.

Sleep/Wake-up

Sleep Mode Entry

R_SAU_LIN_SleepEnter can be called to place the bus into bus sleep mode. When in bus sleep mode, an external interrupt is enabled on the RXD pin which can be used to notify the application when bus activity on RXDn is detected.

R_SAU_LIN_SleepEnter does not place the MCU in a low power mode. To use it to wake from a low power mode, call R_SAU_LIN_SleepEnter, then use the Low Power Modes (r_lpm) driver to enter a low power mode.

Sleep Mode Exit

Bus sleep mode can be exited in the following ways:

1. The LIN wake up signal is detected
2. The LIN break field is detected
3. The application calls R_SAU_LIN_SleepExit

Note

If sleep mode is exited by break field detection, the incoming frame cannot be processed by the driver. Subsequent frames can be processed normally.

Wake-up Signal

Both the master and slave can send the LIN wake-up signal by calling R_SAU_LIN_WakeupSend.

Wake-up retry schedules, if required, must be implemented by the application.

If a LIN master receives the wake-up signal from a slave, the master should wait until the entire LIN cluster is ready before sending new header frames to ensure the frames can be processed by the slaves. The amount of time until the cluster is ready is application specific.

Timeouts/Errors

The application is responsible for managing timeouts in case R_SAU_LIN_Read() is called, but the data is not received in the expected time period. If a timeout occurs, R_SAU_LIN_CommunicationAbort() may be called to cancel a pending read.

When an error occurs, reception is stopped and the user callback is called with the relevant error code.

Checksum Generation and Validation

• The checksum calculation is performed in software for both checksum generation and validation.
• Checksum generation and validation are both optional.
• The LIN checksum may be generated by passing lin_transfer_params_t::LIN_CHECKSUM_TYPE_CLASSIC or lin_transfer_params_t::LIN_CHECKSUM_TYPE_ENHANCED when writing data.
• The LIN checksum may be validated by passing lin_transfer_params_t::LIN_CHECKSUM_TYPE_CLASSIC or lin_transfer_params_t::LIN_CHECKSUM_TYPE_ENHANCED when reading data.
• To skip driver checksum generation/validation, pass lin_transfer_params_t::LIN_CHECKSUM_TYPE_NONE to the read/write functions. Instead the checksum can be included as part of the data buffer, or omitted entirely depending on the application's needs.
• If not using driver checksum generation/validation for any LIN instance, it is recommended to set 'Checksum Support > Disabled' to reduce code size.
• The maximum number of data bytes that can be transmitted per frame is 255, including the checksum byte. Thus, when checksum generation/validation is requested in the transfer parameters, the maximum number of bytes that can be specified in transfer_params.num_bytes is 254. When checksum generation/validation is not requested in the transfer parameters, the maximum number of bytes that can be specified in transfer_params.num_bytes is 255.

Auto Synchronization

Auto synchronization is optional. When it is disabled, the baud rate set in R_SAU_LIN_Open is never updated.

This feature works in slave mode only.

• Auto synchronization is not the same as automatic baud rate detection. Auto synchronization is used for correcting small clock drift/difference in baud rate between nodes.
• Auto synchronization performs small automatic baud rate adjustments to synchronize with the master's clock by measuring pulse intervals between the falling edges of the input signal from the RXDn pin during reception of the LIN sync byte.
• The sync byte is measured and the baud rate is re-adjusted for every LIN sync byte received.
• When auto synchronization is enabled, it may change the operation clock frequency of the SAU unit during the baud rate adjustment. Since the operation clocks are shared between SAU channels on each SAU unit, altering the shared operation clock of one instance will result in an incorrect bitrate being generated on the other instance(s). Therefore, if your application cannot accommodate changes to the operation clock, it is advisable to disable auto synchronization or use a different operation clock for each instance.

Limitations

• Automatic (arbitrary) baud rate detection is not supported.
• The SAU provides an interface to the LIN Physical layer and does not implement the LIN Transport Layer or LIN Application Layer. The application is responsible for handling the frame scheduling table and monitoring for Transport Layer timeouts.
• A new LIN break field cannot be detected during slave sync byte measurement.

Examples

Basic LIN Slave Example

The following demonstrates a basic example of header reception and data response for a LIN slave.

void r_sau_lin_basic_slave_example (void)
{
    /* Initialize transmit buffer to known data */
    for (uint32_t i = 0; i < TRANSFER_LENGTH; i++)
    {
        g_tx_buf[i] = (uint8_t) ('A' + (i % 26));
    }

    /* Open the LIN instance with initial configuration. */
    fsp_err_t err = R_SAU_LIN_Open(&g_slave_ctrl, &g_slave_cfg);

    assert(FSP_SUCCESS == err);

    /* Wait for the header that this slave publishes the response to. */
    for ( ; ; )
    {
        if (g_header_rx_complete)
        {
            if (g_received_pid == FRAME_ID)
            {
                /* Frame ID of interest received */
                break;
            }

            /* Ignore this header. No action required by slave. */
            g_header_rx_complete = false;
        }
    }

    lin_transfer_params_t write_params =
    {
        .checksum_type = LIN_CHECKSUM_TYPE_ENHANCED,
        .id            = g_received_pid,
        .num_bytes     = TRANSFER_LENGTH,
        .p_data        = g_tx_buf
    };

    /* Send the LIN data response */
    err = R_SAU_LIN_Write(&g_slave_ctrl, &write_params);

    assert(FSP_SUCCESS == err);

    /* Wait for the response transmission to complete */
    while (!g_data_tx_complete)
    {
    }

    /* Close the driver  */
    err = R_SAU_LIN_Close(&g_slave_ctrl);

    assert(FSP_SUCCESS == err);
}

void slave_callback (lin_callback_args_t * p_args)
{
    /* Handle the LIN event */
    switch (p_args->event)
    {
        case LIN_EVENT_RX_HEADER_COMPLETE:
        {
            g_header_rx_complete = 1;
            g_received_pid       = p_args->pid;
            break;
        }

        case LIN_EVENT_RX_DATA_COMPLETE:
        {
            g_data_rx_complete = 1;
            break;
        }

        case LIN_EVENT_TX_DATA_COMPLETE:
        {
            g_data_tx_complete = 1;
            break;
        }

        case LIN_EVENT_TX_WAKEUP_COMPLETE:
        {
            g_wakeup_tx_complete = 1;
            break;
        }

        case LIN_EVENT_RX_WAKEUP_COMPLETE:
        {
            g_wakeup_rx_complete = 1;
            break;
        }

        default:
        {
            /* Handle error */
        }
    }
}

Basic LIN Master Read Example

The following demonstrates a basic example of frame reception for a LIN master.

void r_sau_lin_basic_master_read_example (void)
{
    /* Open the LIN instance with initial configuration. */
    fsp_err_t err = R_SAU_LIN_Open(&g_master_ctrl, &g_master_cfg);

    assert(FSP_SUCCESS == err);

    /* Send the header only */
    lin_transfer_params_t write_params =
    {
        .checksum_type = LIN_CHECKSUM_TYPE_ENHANCED,
        .id            = FRAME_ID,
        .num_bytes     = 0,
        .p_data        = NULL          /* Set to NULL to send header only */
    };

    err = R_SAU_LIN_Write(&g_master_ctrl, &write_params);

    assert(FSP_SUCCESS == err);

    /* Wait for header transmission to complete before starting a read of the response */
    while (!g_header_tx_complete)
    {
    }

    lin_transfer_params_t read_params =
    {
        .checksum_type = LIN_CHECKSUM_TYPE_ENHANCED,
        .id            = FRAME_ID,
        .num_bytes     = TRANSFER_LENGTH,
        .p_data        = g_rx_buf
    };


    /* Begin reception of the frame data */
    err = R_SAU_LIN_Read(&g_master_ctrl, &read_params);


    assert(FSP_SUCCESS == err);

    /* Wait for data reception to complete. The application is responsible for
     * timing out if data is not received within the expected time interval*/
    while (!g_data_rx_complete)
    {
    }

    /* Close the driver  */
    err = R_SAU_LIN_Close(&g_slave_ctrl);

    assert(FSP_SUCCESS == err);
}

void master_callback (lin_callback_args_t * p_args)
{
    /* Handle the LIN event */
    switch (p_args->event)
    {
        case LIN_EVENT_RX_DATA_COMPLETE:
        {
            g_data_rx_complete = 1;
            break;
        }

        case LIN_EVENT_TX_HEADER_COMPLETE:
        {
            g_header_tx_complete = 1;
            break;
        }

        case LIN_EVENT_TX_DATA_COMPLETE:
        {
            g_data_tx_complete = 1;
            break;
        }

        case LIN_EVENT_TX_WAKEUP_COMPLETE:
        {
            g_wakeup_tx_complete = 1;
            break;
        }

        case LIN_EVENT_RX_WAKEUP_COMPLETE:
        {
            g_wakeup_rx_complete = 1;
            break;
        }

        case LIN_EVENT_ERR_INVALID_CHECKSUM:
        case LIN_EVENT_ERR_BUS_COLLISION_DETECTED:
        case LIN_EVENT_ERR_FRAMING:
        case LIN_EVENT_ERR_COUNTER_OVERFLOW:
        case LIN_EVENT_ERR_OVERRUN:
        case LIN_EVENT_ERR_PARITY:
        default:
        {
            /* Handle error */
        }
    }
}

Basic LIN Master Write Example

The following demonstrates a basic example of frame transmission for a LIN master.

void r_sau_lin_basic_master_write_example (void)
{
    /* Initialize transmit buffer to known data. */
    for (uint8_t i = 0; i < TRANSFER_LENGTH; i++)
    {
        g_tx_buf[i] = (uint8_t) ('A' + (i % 26));
    }


    /* Open the LIN instance with initial configuration. */
    fsp_err_t err = R_SAU_LIN_Open(&g_master_ctrl, &g_master_cfg);


    assert(FSP_SUCCESS == err);


    lin_transfer_params_t write_params =
    {
        .checksum_type = LIN_CHECKSUM_TYPE_ENHANCED,
        .id            = FRAME_ID,
        .num_bytes     = TRANSFER_LENGTH,
        .p_data        = g_tx_buf
    };

    /* Send the LIN data. In master mode, the header (break, sync, and protected identifier) will be sent before the data. */
    err = R_SAU_LIN_Write(&g_master_ctrl, &write_params);


    assert(FSP_SUCCESS == err);

    /* Wait for data transmission to complete */
    while (!g_data_tx_complete)
    {
    }


    /* Close the driver  */
    err = R_SAU_LIN_Close(&g_master_ctrl);


    assert(FSP_SUCCESS == err);
}

Basic LIN Send Wake Up Example

The following demonstrates a basic example of sending wake up signal for a LIN master. The usage of slave mode is the same.

void r_sau_lin_send_wakeup_example (void)
{
    /* Open the LIN instance with initial configuration. */
    fsp_err_t err = R_SAU_LIN_Open(&g_master_ctrl, &g_master_cfg);

    assert(FSP_SUCCESS == err);


    /* Send the LIN wake up signal */
    err = R_SAU_LIN_WakeupSend(&g_master_ctrl);


    assert(FSP_SUCCESS == err);

    while (!g_wakeup_tx_complete)
    {
    }

    /* Application specific delay for slaves to re-initialize */
    R_BSP_SoftwareDelay(SLAVE_INITIALIZATION_DELAY_MS, BSP_DELAY_UNITS_MILLISECONDS);

    /* Send additional frames as needed */

    /* Close the driver  */
    err = R_SAU_LIN_Close(&g_slave_ctrl);

    assert(FSP_SUCCESS == err);
}

Basic LIN Sleep Enter Example

The following demonstrates a basic example of entering sleep mode for a LIN slave. The usage in master mode is the same.

void r_sau_lin_sleep_enter_example (void)
{
    /* Open the LIN instance with initial configuration. */
    fsp_err_t err = R_SAU_LIN_Open(&g_slave_ctrl, &g_slave_cfg);

    assert(FSP_SUCCESS == err);


    /* Open IRQ to prepare getting LIN_EVENT_RX_WAKEUP_COMPLETE */
    err = R_SAU_LIN_SleepEnter(&g_slave_ctrl);

    assert(FSP_SUCCESS == err);

    /* If a low power mode is required, call R_LPM_LowPowerModeEnter */


    while (!g_wakeup_rx_complete)
    {
    }

    /* Close the driver  */
    err = R_SAU_LIN_Close(&g_slave_ctrl);

    assert(FSP_SUCCESS == err);
}

Basic LIN Sleep Exit Example

The following demonstrates a basic example of exiting the LIN slave sleep mode. The usage in master mode is the same.

void r_sau_lin_sleep_exit_example (void)
{
    /* Open the LIN instance with initial configuration. */
    fsp_err_t err = R_SAU_LIN_Open(&g_slave_ctrl, &g_slave_cfg);

    assert(FSP_SUCCESS == err);

    /* Enter bus sleep mode */
    err = R_SAU_LIN_SleepEnter(&g_slave_ctrl);

    assert(FSP_SUCCESS == err);

    /* Exit the bus sleep mode for LIN device.*/
    err = R_SAU_LIN_SleepExit(&g_slave_ctrl);

    assert(FSP_SUCCESS == err);

    /* Close the driver  */
    err = R_SAU_LIN_Close(&g_slave_ctrl);

    assert(FSP_SUCCESS == err);
}

Data Structures
struct	sau_lin_extended_cfg_t
struct	sau_lin_instance_ctrl_t

Enumerations
enum	sau_lin_state_t
enum	sau_lin_synchronization_t

---

Data Structure Documentation

sau_lin_extended_cfg_t

struct sau_lin_extended_cfg_t

SAU UART LIN extended configuration

Data Fields
const uart_instance_t *	p_uart	The UART instance used in SAU LIN.
const external_irq_instance_t *	p_icu	The IRQ instance used in SAU LIN.

sau_lin_instance_ctrl_t

struct sau_lin_instance_ctrl_t

LIN Instance Control Block. DO NOT INITIALIZE.

Enumeration Type Documentation

sau_lin_state_t

enum sau_lin_state_t

SAU LIN Event codes

Enumerator
SAU_LIN_STATE_NONE	Master mode: No event present Slave mode: Waiting for break field signal.
SAU_LIN_STATE_SENDING_WAKEUP	Transmitting wakeup signal.
SAU_LIN_STATE_SENDING_BREAK_FIELD	Transmitting break field signal.
SAU_LIN_STATE_SENDING_SYNC	Transmitting sync word.
SAU_LIN_STATE_AWAITING_SYNC_SIGNAL	Waiting to receive sync word.
SAU_LIN_STATE_SENDING_PID	Transmitting protected identifier.
SAU_LIN_STATE_AWAITING_PID_SIGNAL	Waiting to receive protected identifier.
SAU_LIN_STATE_HEADER_RECEIVED	LIN header received.
SAU_LIN_STATE_SENDING_DATA	Transmitting LIN data.
SAU_LIN_STATE_AWAITING_DATA	Receiving LIN data.
SAU_LIN_STATE_AWAITING_CHECKSUM	Receiving LIN checksum.
SAU_LIN_STATE_BUS_SLEEP	Bus sleep state.

sau_lin_synchronization_t

enum sau_lin_synchronization_t

Auto synchronization setting.

Enumerator
SAU_LIN_AUTO_SYNCHRONIZATION_DISABLE	Disable auto synchronization during sync byte reception.
SAU_LIN_AUTO_SYNCHRONIZATION_ENABLE	Enable auto synchronization during sync byte reception.

Function Documentation

R_SAU_LIN_Open()

fsp_err_t R_SAU_LIN_Open	(	lin_ctrl_t *const	p_api_ctrl,
		lin_cfg_t const *const	p_cfg
	)

Configures the LIN driver channel based on the input configuration.

Implements lin_api_t::open.

Example:

    /* Open the LIN instance with initial configuration. */
    fsp_err_t err = R_SAU_LIN_Open(&g_master_ctrl, &g_master_cfg);

Return values

FSP_SUCCESS	Channel opened successfully.
FSP_ERR_ASSERTION	Pointer to LIN control block, configuration structure, or required dependency is NULL
FSP_ERR_ALREADY_OPEN	Control block has already been opened or channel is being used by another instance. Call close() then open() to reconfigure.
FSP_ERR_INVALID_MODE	Setting not supported for selected mode

Returns

See Common Error Codes or functions called by this function for other possible return codes.

R_SAU_LIN_Write()

fsp_err_t R_SAU_LIN_Write	(	lin_ctrl_t *const	p_api_ctrl,
		const lin_transfer_params_t *const	p_transfer_params
	)

Begins non-blocking transmission of a LIN frame.

In master mode, the LIN header (break, sync and protected identifier) is sent before the LIN data.

• To transmit the LIN header only, set p_transfer_params->p_data to NULL.
• To transmit both header and data, set p_transfer_params->p_data to the TX buffer to transmit.

The LIN header is not transmitted in slave mode. Set p_transfer_params->p_data to the TX buffer to transmit.

On successful header-only transmission completion, the callback is called with event lin_event_t::LIN_EVENT_TX_HEADER_COMPLETE. On successful data transmission or header+data transmission completion, the callback is called with event lin_event_t::LIN_EVENT_TX_DATA_COMPLETE.

Implements lin_api_t::write.

Example:

    lin_transfer_params_t write_params =
    {
        .checksum_type = LIN_CHECKSUM_TYPE_ENHANCED,
        .id            = FRAME_ID,
        .num_bytes     = TRANSFER_LENGTH,
        .p_data        = g_tx_buf
    };

    /* Send the LIN data. In master mode, the header (break, sync, and protected identifier) will be sent before the data. */
    err = R_SAU_LIN_Write(&g_master_ctrl, &write_params);

Return values

FSP_SUCCESS	Data transmission started successfully.
FSP_ERR_NOT_OPEN	The control block has not been opened.
FSP_ERR_ASSERTION	Pointer to LIN control block, transfer parameters, or tx/rx buffer is NULL, or 0 bytes length provided。
FSP_ERR_IN_USE	A transmission or reception is currently in progress. Call R_SAU_LIN_CommunicationAbort to cancel it if desired, or wait for the current transfer operation to complete before starting a new one.

Returns

See Common Error Codes or functions called by this function for other possible return codes.

R_SAU_LIN_Read()

fsp_err_t R_SAU_LIN_Read	(	lin_ctrl_t *const	p_api_ctrl,
		lin_transfer_params_t *const	p_transfer_params
	)

Begins non-blocking data reception to receive user specified number of bytes into destination buffer pointer.

The checksum type specifies the checksum type used for validation. If a non-standard algorithm is used, or the application prefers to validate the checksum outside the driver, or the application prefers to skip checksum validation, specify lin_checksum_type_t::LIN_CHECKSUM_TYPE_NONE. If checksum validation is skipped, the lin_checksum_type_t::LIN_EVENT_ERR_INVALID_CHECKSUM event is not possible. When lin_checksum_type_t::LIN_CHECKSUM_TYPE_NONE is used, the number of bytes specified in the receive buffer length will be received (the driver will not expect to receive an additional 1 checksum byte), so if a non-standard checksum is used, sufficient space must be allocated in the write buffer and accounted for in the provided length.

On successful data reception, the callback is called with event lin_event_t::LIN_EVENT_RX_DATA_COMPLETE.

Implements lin_api_t::read.

Example:

    /* Begin reception of the frame data */
    err = R_SAU_LIN_Read(&g_master_ctrl, &read_params);

Return values

FSP_SUCCESS	Data reception started successfully.
FSP_ERR_NOT_OPEN	The control block has not been opened.
FSP_ERR_ASSERTION	Pointer to LIN control block, transfer parameters, or tx/rx buffer is NULL, or 0 bytes length provided, no header matching pid was received(only for slave mode).
FSP_ERR_IN_USE	A transmission or reception is currently in progress. Call R_SAU_LIN_CommunicationAbort to cancel it if desired, or wait for the current transfer operation to complete before starting a new one.
FSP_ERR_INVALID_CALL	Data reception is not possible because a header frame has not been received yet (slave mode only).

Returns

See Common Error Codes or functions called by this function for other possible return codes.

R_SAU_LIN_CommunicationAbort()

fsp_err_t R_SAU_LIN_CommunicationAbort

(

lin_ctrl_t *const

p_api_ctrl

)

Cancels in progress data read or write, or header read or write. Break field reception cannot be cancelled. For slave nodes, reception of a new header reception is still enabled after a call to this function.

Implements lin_api_t::communicationAbort.

Return values

FSP_SUCCESS	Data transfer aborted successfully or no transfer was in progress.
FSP_ERR_NOT_OPEN	The control block has not been opened.
FSP_ERR_ASSERTION	Pointer to LIN control block is NULL.
FSP_ERR_INVALID_STATE	Driver is in bus sleep state. Call R_SAU_LIN_SleepExit to return to active state or wait for wakeup signal.

Returns

See Common Error Codes or functions called by this function for other possible return codes.

R_SAU_LIN_CallbackSet()

fsp_err_t R_SAU_LIN_CallbackSet	(	lin_ctrl_t *const	p_api_ctrl,
		void(*)(lin_callback_args_t *)	p_callback,
		void *const	p_context,
		lin_callback_args_t *const	p_callback_memory
	)

Updates the user callback and callback context.

Note

Providing callback memory is not supported, pass NULL to this function for p_callback_memory.

Implements lin_api_t::callbackSet.

Return values

FSP_SUCCESS	Callback updated successfully.
FSP_ERR_ASSERTION	Pointer to LIN control block, callback function is NULL, or p_callback_memory is not NULL.
FSP_ERR_NOT_OPEN	The control block has not been opened.
FSP_ERR_INVALID_STATE	Driver is in bus sleep state. Call R_SAU_LIN_SleepExit to return to active state or wait for wakeup signal.

Returns

See Common Error Codes or functions called by this function for other possible return codes.

R_SAU_LIN_WakeupSend()

fsp_err_t R_SAU_LIN_WakeupSend

(

lin_ctrl_t *const

p_api_ctrl

)

Begins non-blocking transmission of the LIN wakeup signal.

On successful wakeup signal transmission, the callback is called with event lin_event_t::LIN_EVENT_TX_WAKEUP_COMPLETE.

Implements lin_api_t::wakeupSend.

Example:

    /* Send the LIN wake up signal */
    err = R_SAU_LIN_WakeupSend(&g_master_ctrl);

Return values

FSP_SUCCESS	Wakeup signal transmission successfully started.
FSP_ERR_ASSERTION	Pointer to LIN control block is NULL.
FSP_ERR_NOT_OPEN	The control block has not been opened.
FSP_ERR_UNSUPPORTED	Unsupported when Wake-up Support build option is disabled.
FSP_ERR_INVALID_STATE	Driver is in bus sleep state. Call R_SAU_LIN_SleepExit to return to active state or wait for wakeup signal.

Returns

See Common Error Codes or functions called by this function for other possible return codes.

R_SAU_LIN_SleepEnter()

fsp_err_t R_SAU_LIN_SleepEnter

(

lin_ctrl_t *const

p_api_ctrl

)

Places the LIN node in bus sleep mode. Enables the external IRQ that can be used to detect the LIN wakeup signal.

On wakeup signal reception, the callback is called with event lin_event_t::LIN_EVENT_RX_WAKEUP_COMPLETE and bus sleep mode is automatically exited.

Note

This function does not put the MCU into a low power mode. Call this function prior to entering a low power mode to enable LIN wakeup signal detection support.

Implements lin_api_t::sleepEnter.

Example:

    /* Open IRQ to prepare getting LIN_EVENT_RX_WAKEUP_COMPLETE */
    err = R_SAU_LIN_SleepEnter(&g_slave_ctrl);

    assert(FSP_SUCCESS == err);

    /* If a low power mode is required, call R_LPM_LowPowerModeEnter */

Return values

FSP_SUCCESS	Bus successfully transitioned to sleep state.
FSP_ERR_ASSERTION	Pointer to LIN control block is NULL.
FSP_ERR_NOT_OPEN	The control block has not been opened.
FSP_ERR_UNSUPPORTED	Unsupported when Wake-up Support build option is disabled.
FSP_ERR_INVALID_STATE	Driver is in bus sleep state. Call R_SAU_LIN_SleepExit to return to active state or wait for wakeup signal.
FSP_ERR_NOT_ENABLED	ICU module is not enabled.

Returns

See Common Error Codes or functions called by this function for other possible return codes.

R_SAU_LIN_SleepExit()

fsp_err_t R_SAU_LIN_SleepExit

(

lin_ctrl_t *const

p_api_ctrl

)

Exits the bus sleep mode for LIN device. Disables wakeup signal detection.

Implements lin_api_t::sleepExit.

Return values

FSP_SUCCESS	Bus successfully transitioned to active state
FSP_ERR_ASSERTION	Pointer to LIN control block is NULL.
FSP_ERR_NOT_OPEN	The control block has not been opened.
FSP_ERR_UNSUPPORTED	Unsupported when Wake-up Support build option is disabled.
FSP_ERR_NOT_ENABLED	ICU module is not enabled.

Returns

See Common Error Codes or functions called by this function for other possible return codes.

R_SAU_LIN_Close()

fsp_err_t R_SAU_LIN_Close

(

lin_ctrl_t *const

p_api_ctrl

)

Closes the LIN driver.

Implements lin_api_t::close.

Example:

    /* Close the driver  */
    err = R_SAU_LIN_Close(&g_master_ctrl);

Return values

FSP_SUCCESS	Channel successfully closed.
FSP_ERR_ASSERTION	Pointer to LIN control block is NULL.
FSP_ERR_NOT_OPEN	The control block has not been opened.

Returns

See Common Error Codes or functions called by this function for other possible return codes.

R_SAU_LIN_InformationFrameRead()

fsp_err_t R_SAU_LIN_InformationFrameRead	(	lin_ctrl_t *const	p_api_ctrl,
		lin_transfer_params_t *const	p_transfer_params
	)

DEPRECATED. Use R_SAU_LIN_Read.

Returns

See Common Error Codes or functions called by this function for other possible return codes.

R_SAU_LIN_StartFrameWrite()

fsp_err_t R_SAU_LIN_StartFrameWrite	(	lin_ctrl_t *const	p_api_ctrl,
		uint8_t const	id
	)

[DEPRECATED] Use R_SAU_LIN_Write

Returns

See Common Error Codes or functions called by this function for other possible return codes.

R_SAU_LIN_InformationFrameWrite()

fsp_err_t R_SAU_LIN_InformationFrameWrite	(	lin_ctrl_t *const	p_api_ctrl,
		const lin_transfer_params_t *const	p_transfer_params
	)

[DEPRECATED] Use R_SAU_LIN_Write

Returns

See Common Error Codes or functions called by this function for other possible return codes.