Functions
fsp_err_t	R_SCI_B_UART_Open (uart_ctrl_t const p_api_ctrl, uart_cfg_t const const p_cfg)

fsp_err_t	R_SCI_B_UART_Close (uart_ctrl_t *const p_api_ctrl)

fsp_err_t	R_SCI_B_UART_Read (uart_ctrl_t const p_api_ctrl, uint8_t const p_dest, uint32_t const bytes)

fsp_err_t	R_SCI_B_UART_Write (uart_ctrl_t const p_api_ctrl, uint8_t const const p_src, uint32_t const bytes)

fsp_err_t	R_SCI_B_UART_CallbackSet (uart_ctrl_t const p_api_ctrl, void(p_callback)(uart_callback_args_t ), void const const p_context, uart_callback_args_t *const p_callback_memory)

fsp_err_t	R_SCI_B_UART_BaudSet (uart_ctrl_t const p_api_ctrl, void const const p_baud_setting)

fsp_err_t	R_SCI_B_UART_InfoGet (uart_ctrl_t const p_api_ctrl, uart_info_t const p_info)

fsp_err_t	R_SCI_B_UART_Abort (uart_ctrl_t *const p_api_ctrl, uart_dir_t communication_to_abort)

fsp_err_t	R_SCI_B_UART_ReadStop (uart_ctrl_t const p_api_ctrl, uint32_t remaining_bytes)

fsp_err_t	R_SCI_B_UART_BaudCalculate (uint32_t baudrate, bool bitrate_modulation, uint32_t baud_rate_error_x_1000, sci_b_baud_setting_t *const p_baud_setting)

Detailed Description

Driver for the SCI peripheral on RA MCUs. This module implements the UART Interface.

Overview

Features

The SCI UART module supports the following features:

Full-duplex UART communication
Interrupt-driven data transmission and reception
Invoking the user-callback function with an event code (RX/TX complete, TX data empty, RX char, error, etc)
Baud-rate change at run-time
Bit rate modulation and noise cancellation
CTS/RTS hardware flow control (with an associated pin)
RS-485 Half Duplex driver support with external RS-485 transceiver
Integration with the DTC transfer module
Abort in-progress read/write operations
FIFO support on supported channels

Configuration

Build Time Configurations for r_sci_b_uart

The following build time configurations are defined in fsp_cfg/r_sci_b_uart_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.
FIFO Support	Enable Disable	Disable	Enable FIFO support for the SCI_UART module.
DTC Support	Enable Disable	Disable	Enable DTC support for the SCI_UART module.
Flow Control Support	Enable Disable	Disable	Enable RS232 and RS-485 flow control support using a user provided pin.

Configurations for Connectivity > UART (r_sci_b_uart)

This module can be added to the Stacks tab via New Stack > Connectivity > UART (r_sci_b_uart). Non-secure callable guard functions can be generated for this module by right clicking the module in the RA Configuration tool and checking the "Non-secure Callable" box.

Configuration	Options	Default	Description
General
Name	Name must be a valid C symbol	g_uart0	Module name.
Channel	Value must be a non-negative integer	0	Select the SCI channel.
Data Bits	8bits 7bits 9bits	8bits	Select the number of bits per word.
Parity	None Odd Even	None	Select the parity mode.
Stop Bits	1bit 2bits	1bit	Select the number of stop bits.
Baud
Baud Rate	Value must be an integer greater than 0	115200	Enter the desired baud rate. If the requested baud rate cannot be achieved, the settings with the smallest percent error are used. The theoretical calculated baud rate and percent error are printed in a comment in the generated sci_b_baud_setting_t structure.
Baud Rate Modulation	Disabled Enabled	Disabled	Enabling baud rate modulation reduces the percent error of the actual baud rate with respect to the requested baud rate. It does this by modulating the number of cycles per clock, so some bits are slightly longer than others.
Max Error (%)	Must be a valid non-negative integer with a maximum configurable value of 100	5	Maximum percent error allowed during baud calculation. This is used by the algorithm to determine whether or not to consider using less accurate alternative register settings. NOTE: The baud calculation does not show an error in the tool if this percent error was not achieved. The calculated percent error is recorded in a comment in the generated sci_b_baud_setting_t structure.
Flow Control
CTS/RTS Selection	MCU Specific Options		Select either CTS or RTS function on the CTSn_RTSn pin of SCI channel n or select CTS function on CTSn pin and RTS function on CTSn_RTSn pin of SCI channel n (Available on selected MCUs and channels).
Software RTS Port	Refer to the RA Configuration tool for available options.	Disabled	Specify the flow control pin port for the MCU.
Software RTS Pin	Refer to the RA Configuration tool for available options.	Disabled	Specify the flow control pin for the MCU.
Extra
Extra > RS-485
DE Pin	Disable Enable	Disable	Enable or disable the DE pin for use in RS-485 half-duplex mode.
DE Pin Polarity	Active Low Active High	Active High	Select the polarity of the DE pin.
DE Pin Assertion Time	Must be a valid integer greater than 0 and less than or equal to 31.	1	Configure the time between assertion of the DE pin and the start of a write transfer. The time is specified in multiples of the SCI base clock period.
DE Pin Negation Time	Must be a valid integer greater than 0 and less than or equal to 31.	1	Configure the time between the end of a write transfer and the negation of the DE pin. The time is specified in multiples of the SCI base clock period.
Clock Source	Internal Clock Internal Clock With Output on SCK External Clock 8x baud rate External Clock 16x baud rate	Internal Clock	Selection of the clock source to be used in the baud-rate clock generator. When internal clock is used the baud rate can be output on the SCK pin.
Start bit detection	Falling Edge Low Level	Falling Edge	Start bit detected as falling edge or low level.
Noise Filter	Enable Disable	Disable	Enable the digital noise filter on RXDn pin. The digital noise filter block in SCI consists of two-stage flipflop circuits.
Receive FIFO Trigger Level	Refer to the RA Configuration tool for available options.	Max	Unused if the channel has no FIFO or if DTC is used for reception. Set to One to get a callback immediately when each byte is received. Set to Max to get a callback when FIFO is full or after 15 bit times with no data (fewer interrupts).
Interrupts
Callback	Name must be a valid C symbol	NULL	A user callback function can be provided. If this callback function is provided, it will be called from the interrupt service routine (ISR).
Receive Interrupt Priority	MCU Specific Options		Select the receive interrupt priority.
Transmit Data Empty Interrupt Priority	MCU Specific Options		Select the transmit interrupt priority.
Transmit End Interrupt Priority	MCU Specific Options		Select the transmit end interrupt priority.
Error Interrupt Priority	MCU Specific Options		Select the error interrupt priority.

Clock Configuration

The clock for this module is derived from the following peripheral clock for each MCU group:

MCU Group	Peripheral Clock
RA6T2	SCISPICLK
RA8D1	SCICLK
RA8E1	SCICLK
RA8M1	SCICLK
RA8T1	SCICLK

The clock source for the baud-rate clock generator can be selected from the internal clock, the external clock times 8 or the external clock times 16. The external clock is supplied to the SCK pin.

Pin Configuration

This module uses TXD and RXD to communicate to external devices. CTS or RTS can be controlled by the hardware. CTS or RTS or both (CTS and RTS) can be controlled by the hardware When the internal clock is the source for the baud-rate generator the SCK pin can be used to output a clock with the same frequency as the bit rate.

Usage Notes

When configured for Hardware CTS and Software RTS the configured flow control pin will be used for RTS. The pin will be set high inside of the receive ISR while data is being read. It will be set low when all data is read.
When configured for Hardware CTS and Hardware RTS the CSTn_RTSn pin will be used for RTS function and the CTSn pin will be used for CTS function on channel n.
The driver will follow correct hardware flow control function when CTSn_RTSn pin is connected to CTSn pin when "Hardware CTS and Hardware RTS" flow control is selected. The data will still be transferred when CTSn_RTSn and CTSn are disconnected as the CTSn pin is internally pulled low on the hardware when CTSn pin is configured as a peripheral pin for SCI module. Do not configure CTSn pin if the hardware flow control is not desired.

Limitations

Reception is still enabled after uart_api_t::communicationAbort API is called. Any characters received after abort and before the next call to read will arrive via the callback function with event UART_EVENT_RX_CHAR.

DTC Limitations

DTC support is available for reception, but labeled as [Not recommended]. This is because the UART bytes are received asynchronously. Bytes can be received between calls to R_SCI_B_UART_Read(). The logic required to combine bytes received through R_SCI_B_UART_Read() (UART_EVENT_RX_COMPLETE) and bytes received between calls (UART_EVENT_RX_CHAR) is complex. Reception length may also be unknown, and the driver will not issue an interrupt unless the entire DTC buffer is filled.
Transfer size must be less than or equal to 64K bytes if DTC interface is used for transfer. uart_api_t::infoGet API can be used to get the max transfer size allowed.
When using 9-bit reception with DTC, clear the upper 7 bits of data before processing the read data. The upper 7 bits contain status flags that are part of the register used to read data in 9-bit mode.

Examples

SCI UART Example

uint8_t  g_dest[TRANSFER_LENGTH];
uint8_t  g_src[TRANSFER_LENGTH];
uint8_t  g_out_of_band_received[TRANSFER_LENGTH];
uint32_t g_transfer_complete = 0;
uint32_t g_receive_complete  = 0;
uint32_t g_out_of_band_index = 0;
void r_sci_b_uart_basic_example (void)
{
    /* Initialize p_src to known data */
    for (uint32_t i = 0; i < TRANSFER_LENGTH; i++)
    {
        g_src[i] = (uint8_t) ('A' + (i % 26));
    }
    /* Open the transfer instance with initial configuration. */
    fsp_err_t err = R_SCI_B_UART_Open(&g_uart0_ctrl, &g_uart0_cfg);
    assert(FSP_SUCCESS == err);
    err = R_SCI_B_UART_Read(&g_uart0_ctrl, g_dest, TRANSFER_LENGTH);
    assert(FSP_SUCCESS == err);
    err = R_SCI_B_UART_Write(&g_uart0_ctrl, g_src, TRANSFER_LENGTH);
    assert(FSP_SUCCESS == err);
    while (!g_transfer_complete)
    {
    }
    while (!g_receive_complete)
    {
    }
}
void example_callback (uart_callback_args_t * p_args)
{
    /* Handle the UART event */
    switch (p_args->event)
    {
        /* Received a character */
        case UART_EVENT_RX_CHAR:
        {
            /* Only put the next character in the receive buffer if there is space for it */
            if (sizeof(g_out_of_band_received) > g_out_of_band_index)
            {
                /* Write either the next one or two bytes depending on the receive data size */
                if (UART_DATA_BITS_8 >= g_uart0_cfg.data_bits)
                {
                    g_out_of_band_received[g_out_of_band_index++] = (uint8_t) p_args->data;
                }
                else
                {
                    uint16_t * p_dest = (uint16_t *) &g_out_of_band_received[g_out_of_band_index];
                    *p_dest              = (uint16_t) p_args->data;
                    g_out_of_band_index += 2;
                }
            }
            break;
        }
        /* Receive complete */
        case UART_EVENT_RX_COMPLETE:
        {
            g_receive_complete = 1;
            break;
        }
        /* Transmit complete */
        case UART_EVENT_TX_COMPLETE:
        {
            g_transfer_complete = 1;
            break;
        }
        default:
        {
        }
    }
}

SCI UART Baud Set Example

#define SCI_B_UART_BAUDRATE_19200              (19200)
#define SCI_B_UART_BAUDRATE_ERROR_PERCENT_5    (5000)
void r_sci_b_uart_baud_example (void)
{
    sci_b_baud_setting_t baud_setting;
    uint32_t             baud_rate                 = SCI_B_UART_BAUDRATE_19200;
    bool                 enable_bitrate_modulation = false;
    uint32_t             error_rate_x_1000         = SCI_B_UART_BAUDRATE_ERROR_PERCENT_5;
    fsp_err_t err = R_SCI_B_UART_BaudCalculate(baud_rate, enable_bitrate_modulation, error_rate_x_1000, &baud_setting);
    assert(FSP_SUCCESS == err);
    err = R_SCI_B_UART_BaudSet(&g_uart0_ctrl, (void *) &baud_setting);
    assert(FSP_SUCCESS == err);
}

Data Structures
struct	sci_b_uart_instance_ctrl_t

struct	sci_b_baud_setting_t

struct	sci_b_uart_rs485_setting_t

struct	sci_b_uart_extended_cfg_t

Enumerations
enum	sci_b_clk_src_t

enum	sci_b_uart_flow_control_t

enum	sci_b_uart_rx_fifo_trigger_t

enum	sci_b_uart_start_bit_detect_t

enum	sci_b_uart_noise_cancellation_t

enum	sci_b_uart_rs485_enable_t

enum	sci_b_uart_rs485_de_polarity_t

Data Structure Documentation

◆ sci_b_uart_instance_ctrl_t

struct sci_b_uart_instance_ctrl_t

UART instance control block.

◆ sci_b_baud_setting_t

struct sci_b_baud_setting_t

Register settings to acheive a desired baud rate and modulation duty.

◆ sci_b_uart_rs485_setting_t

struct sci_b_uart_rs485_setting_t

Configuration settings for controlling the DE signal for RS-485.

Data Fields
sci_b_uart_rs485_enable_t	enable	Enable the DE signal.
sci_b_uart_rs485_de_polarity_t	polarity	DE signal polarity.
uint8_t	assertion_time: 5	Time in baseclock units after assertion of the DE signal and before the start of the write transfer.
uint8_t	negation_time: 5	Time in baseclock units after the end of a write transfer and before the DE signal is negated.

◆ sci_b_uart_extended_cfg_t

struct sci_b_uart_extended_cfg_t

UART on SCI device Configuration

Data Fields
sci_b_clk_src_t	clock	The source clock for the baud-rate generator. If internal optionally output baud rate on SCK.
sci_b_uart_start_bit_detect_t	rx_edge_start	Start reception on falling edge.
sci_b_uart_noise_cancellation_t	noise_cancel	Noise cancellation setting.
sci_b_baud_setting_t *	p_baud_setting	Register settings for a desired baud rate.
sci_b_uart_rx_fifo_trigger_t	rx_fifo_trigger	Receive FIFO trigger level, unused if channel has no FIFO or if DTC is used.
bsp_io_port_pin_t	flow_control_pin	UART Driver Enable pin.
sci_b_uart_flow_control_t	flow_control	CTS/RTS function of the SSn pin.
sci_b_uart_rs485_setting_t	rs485_setting	RS-485 settings.

Enumeration Type Documentation

◆ sci_b_clk_src_t

enum sci_b_clk_src_t

Enumeration for SCI clock source

Enumerator
SCI_B_UART_CLOCK_INT	Use internal clock for baud generation.
SCI_B_UART_CLOCK_INT_WITH_BAUDRATE_OUTPUT	Use internal clock for baud generation and output on SCK.
SCI_B_UART_CLOCK_EXT8X	Use external clock 8x baud rate.
SCI_B_UART_CLOCK_EXT16X	Use external clock 16x baud rate.

◆ sci_b_uart_flow_control_t

enum sci_b_uart_flow_control_t

UART flow control mode definition

Enumerator
SCI_B_UART_FLOW_CONTROL_RTS	Use CTSn_RTSn pin for RTS.
SCI_B_UART_FLOW_CONTROL_CTS	Use CTSn_RTSn pin for CTS.
SCI_B_UART_FLOW_CONTROL_HARDWARE_CTSRTS	Use CTSn pin for CTS, CTSn_RTSn pin for RTS.
SCI_B_UART_FLOW_CONTROL_CTSRTS	Use SCI pin for CTS, external pin for RTS.

◆ sci_b_uart_rx_fifo_trigger_t

enum sci_b_uart_rx_fifo_trigger_t

Receive FIFO trigger configuration.

Enumerator
SCI_B_UART_RX_FIFO_TRIGGER_1	Callback after each byte is received without buffering.
SCI_B_UART_RX_FIFO_TRIGGER_2	Callback when FIFO having 2 bytes.
SCI_B_UART_RX_FIFO_TRIGGER_3	Callback when FIFO having 3 bytes.
SCI_B_UART_RX_FIFO_TRIGGER_4	Callback when FIFO having 4 bytes.
SCI_B_UART_RX_FIFO_TRIGGER_5	Callback when FIFO having 5 bytes.
SCI_B_UART_RX_FIFO_TRIGGER_6	Callback when FIFO having 6 bytes.
SCI_B_UART_RX_FIFO_TRIGGER_7	Callback when FIFO having 7 bytes.
SCI_B_UART_RX_FIFO_TRIGGER_8	Callback when FIFO having 8 bytes.
SCI_B_UART_RX_FIFO_TRIGGER_9	Callback when FIFO having 9 bytes.
SCI_B_UART_RX_FIFO_TRIGGER_10	Callback when FIFO having 10 bytes.
SCI_B_UART_RX_FIFO_TRIGGER_11	Callback when FIFO having 11 bytes.
SCI_B_UART_RX_FIFO_TRIGGER_12	Callback when FIFO having 12 bytes.
SCI_B_UART_RX_FIFO_TRIGGER_13	Callback when FIFO having 13 bytes.
SCI_B_UART_RX_FIFO_TRIGGER_14	Callback when FIFO having 14 bytes.
SCI_B_UART_RX_FIFO_TRIGGER_MAX	Callback when FIFO is full or after 15 bit times with no data (fewer interrupts)

◆ sci_b_uart_start_bit_detect_t

enum sci_b_uart_start_bit_detect_t

Asynchronous Start Bit Edge Detection configuration.

Enumerator
SCI_B_UART_START_BIT_LOW_LEVEL	Detect low level on RXDn pin as start bit.
SCI_B_UART_START_BIT_FALLING_EDGE	Detect falling level on RXDn pin as start bit.

◆ sci_b_uart_noise_cancellation_t

enum sci_b_uart_noise_cancellation_t

Noise cancellation configuration.

Enumerator
SCI_B_UART_NOISE_CANCELLATION_DISABLE	Disable noise cancellation.
SCI_B_UART_NOISE_CANCELLATION_ENABLE	Enable noise cancellation.

◆ sci_b_uart_rs485_enable_t

enum sci_b_uart_rs485_enable_t

RS-485 Enable/Disable.

Enumerator
SCI_B_UART_RS485_DISABLE	RS-485 disabled.
SCI_B_UART_RS485_ENABLE	RS-485 enabled.

◆ sci_b_uart_rs485_de_polarity_t

enum sci_b_uart_rs485_de_polarity_t

The polarity of the RS-485 DE signal.

Enumerator
SCI_B_UART_RS485_DE_POLARITY_HIGH	The DE signal is high when a write transfer is in progress.
SCI_B_UART_RS485_DE_POLARITY_LOW	The DE signal is low when a write transfer is in progress.

Function Documentation

◆ R_SCI_B_UART_Open()

fsp_err_t R_SCI_B_UART_Open	(	uart_ctrl_t *const	p_api_ctrl,
		uart_cfg_t const *const	p_cfg
	)

Configures the UART driver based on the input configurations. If reception is enabled at compile time, reception is enabled at the end of this function. Implements uart_api_t::open

Return values

FSP_SUCCESS	Channel opened successfully.
FSP_ERR_ASSERTION	Pointer to UART control block or configuration structure is NULL.
FSP_ERR_IP_CHANNEL_NOT_PRESENT	The requested channel does not exist on this MCU.
FSP_ERR_INVALID_ARGUMENT	Flow control is enabled but flow control pin is not defined.
FSP_ERR_ALREADY_OPEN	Control block has already been opened or channel is being used by another instance. Call close() then open() to reconfigure.

Returns

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

transfer_api_t::open

◆ R_SCI_B_UART_Close()

fsp_err_t R_SCI_B_UART_Close ( uart_ctrl_t *const p_api_ctrl )

Aborts any in progress transfers. Disables interrupts, receiver, and transmitter. Closes lower level transfer drivers if used. Removes power. Implements uart_api_t::close

Return values

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

◆ R_SCI_B_UART_Read()

fsp_err_t R_SCI_B_UART_Read	(	uart_ctrl_t *const	p_api_ctrl,
		uint8_t *const	p_dest,
		uint32_t const	bytes
	)

Receives user specified number of bytes into destination buffer pointer. Implements uart_api_t::read

Return values

FSP_SUCCESS	Data reception successfully ends.
FSP_ERR_ASSERTION	Pointer to UART control block is NULL. Number of transfers outside the max or min boundary when transfer instance used
FSP_ERR_INVALID_ARGUMENT	Destination address or data size is not valid for 9-bit mode.
FSP_ERR_NOT_OPEN	The control block has not been opened
FSP_ERR_IN_USE	A previous read operation is still in progress.
FSP_ERR_UNSUPPORTED	SCI_B_UART_CFG_RX_ENABLE is set to 0

Returns

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

transfer_api_t::reset

Note: If 9-bit data length is specified at R_SCI_B_UART_Open call, p_dest must be aligned 16-bit boundary.

◆ R_SCI_B_UART_Write()

fsp_err_t R_SCI_B_UART_Write	(	uart_ctrl_t *const	p_api_ctrl,
		uint8_t const *const	p_src,
		uint32_t const	bytes
	)

Transmits user specified number of bytes from the source buffer pointer. Implements uart_api_t::write

Return values

FSP_SUCCESS	Data transmission finished successfully.
FSP_ERR_ASSERTION	Pointer to UART control block is NULL. Number of transfers outside the max or min boundary when transfer instance used
FSP_ERR_INVALID_ARGUMENT	Source address or data size is not valid for 9-bit mode.
FSP_ERR_NOT_OPEN	The control block has not been opened
FSP_ERR_IN_USE	A UART transmission is in progress
FSP_ERR_UNSUPPORTED	SCI_B_UART_CFG_TX_ENABLE is set to 0

Returns

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

transfer_api_t::reset

Note: If 9-bit data length is specified at R_SCI_B_UART_Open call, p_src must be aligned on a 16-bit boundary.

◆ R_SCI_B_UART_CallbackSet()

fsp_err_t R_SCI_B_UART_CallbackSet	(	uart_ctrl_t *const	p_api_ctrl,
		void()(uart_callback_args_t )	p_callback,
		void const *const	p_context,
		uart_callback_args_t *const	p_callback_memory
	)

Updates the user callback and has option of providing memory for callback structure. Implements uart_api_t::callbackSet

Return values

FSP_SUCCESS	Callback updated successfully.
FSP_ERR_ASSERTION	A required pointer is NULL.
FSP_ERR_NOT_OPEN	The control block has not been opened.
FSP_ERR_NO_CALLBACK_MEMORY	p_callback is non-secure and p_callback_memory is either secure or NULL.

◆ R_SCI_B_UART_BaudSet()

fsp_err_t R_SCI_B_UART_BaudSet	(	uart_ctrl_t *const	p_api_ctrl,
		void const *const	p_baud_setting
	)

Updates the baud rate using the clock selected in Open. p_baud_setting is a pointer to a sci_b_baud_setting_t structure. Implements uart_api_t::baudSet

Warning: This terminates any in-progress transmission.

Return values

FSP_SUCCESS	Baud rate was successfully changed.
FSP_ERR_ASSERTION	Pointer to UART control block is NULL or the UART is not configured to use the internal clock.
FSP_ERR_NOT_OPEN	The control block has not been opened

◆ R_SCI_B_UART_InfoGet()

fsp_err_t R_SCI_B_UART_InfoGet	(	uart_ctrl_t *const	p_api_ctrl,
		uart_info_t *const	p_info
	)

Provides the driver information, including the maximum number of bytes that can be received or transmitted at a time. Implements uart_api_t::infoGet

Return values

FSP_SUCCESS	Information stored in provided p_info.
FSP_ERR_ASSERTION	Pointer to UART control block is NULL.
FSP_ERR_NOT_OPEN	The control block has not been opened

◆ R_SCI_B_UART_Abort()

fsp_err_t R_SCI_B_UART_Abort	(	uart_ctrl_t *const	p_api_ctrl,
		uart_dir_t	communication_to_abort
	)

Provides API to abort ongoing transfer. Transmission is aborted after the current character is transmitted. Reception is still enabled after abort(). Any characters received after abort() and before the transfer is reset in the next call to read(), will arrive via the callback function with event UART_EVENT_RX_CHAR. Implements uart_api_t::communicationAbort

Return values

FSP_SUCCESS	UART transaction aborted successfully.
FSP_ERR_ASSERTION	Pointer to UART control block is NULL.
FSP_ERR_NOT_OPEN	The control block has not been opened.
FSP_ERR_UNSUPPORTED	The requested Abort direction is unsupported.

Returns

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

transfer_api_t::disable

◆ R_SCI_B_UART_ReadStop()

fsp_err_t R_SCI_B_UART_ReadStop	(	uart_ctrl_t *const	p_api_ctrl,
		uint32_t *	remaining_bytes
	)

Provides API to abort ongoing read. Reception is still enabled after abort(). Any characters received after abort() and before the transfer is reset in the next call to read(), will arrive via the callback function with event UART_EVENT_RX_CHAR. Implements uart_api_t::readStop

Return values

FSP_SUCCESS	UART transaction aborted successfully.
FSP_ERR_ASSERTION	Pointer to UART control block is NULL.
FSP_ERR_NOT_OPEN	The control block has not been opened.
FSP_ERR_UNSUPPORTED	The requested Abort direction is unsupported.

Returns

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

transfer_api_t::disable

◆ R_SCI_B_UART_BaudCalculate()

fsp_err_t R_SCI_B_UART_BaudCalculate	(	uint32_t	baudrate,
		bool	bitrate_modulation,
		uint32_t	baud_rate_error_x_1000,
		sci_b_baud_setting_t *const	p_baud_setting
	)

Calculates baud rate register settings. Evaluates and determines the best possible settings set to the baud rate related registers.

Parameters

[in]	baudrate	Baud rate [bps]. For example, 19200, 57600, 115200, etc.
[in]	bitrate_modulation	Enable bitrate modulation
[in]	baud_rate_error_x_1000	Max baud rate error. At most <baud_rate_percent_error> x 1000 required for module to function. Absolute max baud_rate_error is 15000 (15%).
[out]	p_baud_setting	Baud setting information stored here if successful

Return values

FSP_SUCCESS	Baud rate is set successfully
FSP_ERR_ASSERTION	Null pointer
FSP_ERR_INVALID_ARGUMENT	Baud rate is '0', error in calculated baud rate is larger than requested max error, or requested max error in baud rate is larger than 15%.

Functions

Detailed Description

Overview

Features

Configuration

Build Time Configurations for r_sci_b_uart

Configurations for Connectivity > UART (r_sci_b_uart)

Clock Configuration

Pin Configuration

Usage Notes

Limitations

DTC Limitations

Examples

SCI UART Example

SCI UART Baud Set Example

Data Structures

Enumerations

Data Structure Documentation

◆ sci_b_uart_instance_ctrl_t

◆ sci_b_baud_setting_t

◆ sci_b_uart_rs485_setting_t

◆ sci_b_uart_extended_cfg_t

Enumeration Type Documentation

◆ sci_b_clk_src_t

◆ sci_b_uart_flow_control_t

◆ sci_b_uart_rx_fifo_trigger_t

◆ sci_b_uart_start_bit_detect_t

◆ sci_b_uart_noise_cancellation_t

◆ sci_b_uart_rs485_enable_t

◆ sci_b_uart_rs485_de_polarity_t

Function Documentation

◆ R_SCI_B_UART_Open()

◆ R_SCI_B_UART_Close()

◆ R_SCI_B_UART_Read()

◆ R_SCI_B_UART_Write()

◆ R_SCI_B_UART_CallbackSet()

◆ R_SCI_B_UART_BaudSet()

◆ R_SCI_B_UART_InfoGet()

◆ R_SCI_B_UART_Abort()

◆ R_SCI_B_UART_ReadStop()

◆ R_SCI_B_UART_BaudCalculate()