Classes
struct	sam_usart_opt_t

struct	usart_iso7816_opt_t

struct	usart_spi_opt_t

Macros
#define	SPI_CPHA (1 << 0)

#define	SPI_CPOL (1 << 1)

#define	SPI_MODE_0 0

#define	SPI_MODE_1 (SPI_CPHA)

#define	SPI_MODE_2 (SPI_CPOL)

#define	SPI_MODE_3 (SPI_CPOL \| SPI_CPHA)

Functions
void	usart_disable_interrupt (Usart *p_usart, uint32_t ul_sources)
	Disable USART interrupts. More...

void	usart_disable_rx (Usart *p_usart)
	Disable USART receiver. More...

void	usart_disable_tx (Usart *p_usart)
	Disable USART transmitter. More...

void	usart_disable_writeprotect (Usart *p_usart)
	Disable write protect of USART registers. More...

void	usart_drive_RTS_pin_high (Usart *p_usart)
	Drive the pin RTS to 1. More...

void	usart_drive_RTS_pin_low (Usart *p_usart)
	Drive the pin RTS to 0. More...

void	usart_enable_interrupt (Usart *p_usart, uint32_t ul_sources)
	Enable USART interrupts. More...

void	usart_enable_rx (Usart *p_usart)
	Enable USART receiver. More...

void	usart_enable_tx (Usart *p_usart)
	Enable USART transmitter. More...

void	usart_enable_writeprotect (Usart *p_usart)
	Enable write protect of USART registers. More...

uint8_t	usart_get_error_number (Usart *p_usart)
	Get the total number of errors that occur during an ISO7816 transfer. More...

uint32_t	usart_get_interrupt_mask (Usart *p_usart)
	Read USART interrupt mask. More...

Pdc *	usart_get_pdc_base (Usart *p_usart)
	Get USART PDC base address. More...

uint32_t	usart_get_status (Usart *p_usart)
	Get current status. More...

uint32_t	usart_get_writeprotect_status (Usart *p_usart)
	Get write protect status. More...

uint32_t	usart_getchar (Usart p_usart, uint32_t c)
	Read from USART Receive Holding Register. Before reading user should check if rx is ready. More...

uint32_t	usart_init_hw_handshaking (Usart p_usart, const sam_usart_opt_t p_usart_opt, uint32_t ul_mck)
	Configure USART to work in hardware handshaking mode. More...

uint32_t	usart_init_irda (Usart p_usart, const sam_usart_opt_t p_usart_opt, uint32_t ul_mck)
	Configure USART to work in IrDA mode. More...

uint32_t	usart_init_iso7816 (Usart p_usart, const usart_iso7816_opt_t p_usart_opt, uint32_t ul_mck)
	Configure USART to work in ISO7816 mode. More...

uint32_t	usart_init_rs232 (Usart p_usart, const sam_usart_opt_t p_usart_opt, uint32_t ul_mck)
	Configure USART to work in RS232 mode. More...

uint32_t	usart_init_rs485 (Usart p_usart, const sam_usart_opt_t p_usart_opt, uint32_t ul_mck)
	Configure USART to work in RS485 mode. More...

uint32_t	usart_init_spi_master (Usart p_usart, const usart_spi_opt_t p_usart_opt, uint32_t ul_mck)
	Configure USART to work in SPI mode and act as a master. More...

uint32_t	usart_init_spi_slave (Usart p_usart, const usart_spi_opt_t p_usart_opt)
	Configure USART to work in SPI mode and act as a slave. More...

uint32_t	usart_init_sync_master (Usart p_usart, const sam_usart_opt_t p_usart_opt, uint32_t ul_mck)
	Configure USART to work in SYNC mode and act as a master. More...

uint32_t	usart_init_sync_slave (Usart p_usart, const sam_usart_opt_t p_usart_opt)
	Configure USART to work in SYNC mode and act as a slave. More...

uint32_t	usart_is_rx_buf_end (Usart *p_usart)
	Check if one receive buffer is filled. More...

uint32_t	usart_is_rx_buf_full (Usart *p_usart)
	Check if both receive buffers are full. More...

uint32_t	usart_is_rx_ready (Usart *p_usart)
	Check if the received data are ready. Check if Data have been received and loaded into USART_RHR. More...

uint32_t	usart_is_tx_buf_empty (Usart *p_usart)
	Check if both transmit buffers are empty. More...

uint32_t	usart_is_tx_buf_end (Usart *p_usart)
	Check if one transmit buffer is empty. More...

uint32_t	usart_is_tx_empty (Usart *p_usart)
	Check if Transmit Holding Register is empty. Check if the last data written in USART_THR have been loaded in TSR and the last data loaded in TSR have been transmitted. More...

uint32_t	usart_is_tx_ready (Usart *p_usart)
	Check if Transmit is Ready. Check if data have been loaded in USART_THR and are waiting to be loaded into the Transmit Shift Register (TSR). More...

uint32_t	usart_putchar (Usart *p_usart, uint32_t c)
	Write to USART Transmit Holding Register. More...

uint32_t	usart_read (Usart p_usart, uint32_t c)
	Read from USART Receive Holding Register. More...

void	usart_reset (Usart *p_usart)
	Reset the USART and disable TX and RX. More...

void	usart_reset_iterations (Usart *p_usart)
	Reset the ITERATION in US_CSR when the ISO7816 mode is enabled. More...

void	usart_reset_nack (Usart *p_usart)
	Reset NACK in US_CSR. More...

void	usart_reset_rx (Usart *p_usart)
	Immediately stop and disable USART receiver. More...

void	usart_reset_status (Usart *p_usart)
	Reset status bits (PARE, OVER, MANERR, UNRE and PXBRK in US_CSR). More...

void	usart_reset_tx (Usart *p_usart)
	Immediately stop and disable USART transmitter. More...

void	usart_restart_rx_timeout (Usart *p_usart)
	Restart the receive timeout. More...

uint32_t	usart_send_address (Usart *p_usart, uint32_t ul_addr)
	In Multidrop mode only, the next character written to the US_THR is sent with the address bit set. More...

uint32_t	usart_set_async_baudrate (Usart *p_usart, uint32_t baudrate, uint32_t ul_mck)
	Calculate a clock divider(CD) and a fractional part (FP) for the USART asynchronous modes to generate a baudrate as close as possible to the baudrate set point. More...

void	usart_set_rx_timeout (Usart *p_usart, uint32_t timeout)
	Configure the receive timeout register. More...

void	usart_set_tx_timeguard (Usart *p_usart, uint32_t timeguard)
	Configure the transmit timeguard register. More...

void	usart_spi_force_chip_select (Usart *p_usart)
	Drive the slave select line NSS (RTS pin) to 0 in SPI master mode. More...

void	usart_spi_release_chip_select (Usart *p_usart)
	Drive the slave select line NSS (RTS pin) to 1 in SPI master mode. More...

void	usart_start_rx_timeout (Usart *p_usart)
	Start waiting for a character before clocking the timeout count. Reset the status bit TIMEOUT in US_CSR. More...

void	usart_start_tx_break (Usart *p_usart)
	Start transmission of a break. More...

void	usart_stop_tx_break (Usart *p_usart)
	Stop transmission of a break. More...

uint32_t	usart_write (Usart *p_usart, uint32_t c)
	Write to USART Transmit Holding Register. More...

void	usart_write_line (Usart p_usart, const char string)
	Write one-line string through USART. More...

Detailed Description

Transmitter (USART).

See Quick start guide for the SAM USART module.

This is a low-level driver implementation for the SAM Universal Synchronous/Asynchronous Receiver/Transmitter.

Macro Definition Documentation

◆ SPI_CPHA

#define SPI_CPHA (1 << 0)

Clock phase.

Definition at line 64 of file drivers/usart/usart.h.

◆ SPI_CPOL

#define SPI_CPOL (1 << 1)

Clock polarity.

Definition at line 67 of file drivers/usart/usart.h.

◆ SPI_MODE_0

#define SPI_MODE_0 0

SPI mode definition.

Definition at line 70 of file drivers/usart/usart.h.

◆ SPI_MODE_1

#define SPI_MODE_1 (SPI_CPHA)

Definition at line 71 of file drivers/usart/usart.h.

◆ SPI_MODE_2

#define SPI_MODE_2 (SPI_CPOL)

Definition at line 72 of file drivers/usart/usart.h.

◆ SPI_MODE_3

#define SPI_MODE_3 (SPI_CPOL | SPI_CPHA)

Definition at line 73 of file drivers/usart/usart.h.

Function Documentation

◆ usart_disable_interrupt()

void usart_disable_interrupt	(	Usart *	p_usart,
		uint32_t	ul_sources
	)

Disable USART interrupts.

Parameters

p_usart	Pointer to a USART peripheral.
ul_sources	Interrupt sources bit map.

Definition at line 1480 of file usart.c.

◆ usart_disable_rx()

void usart_disable_rx ( Usart * p_usart )

Disable USART receiver.

Parameters

p_usart Pointer to a USART instance.

Definition at line 1436 of file usart.c.

◆ usart_disable_tx()

void usart_disable_tx ( Usart * p_usart )

Disable USART transmitter.

Parameters

p_usart Pointer to a USART instance.

Definition at line 1394 of file usart.c.

◆ usart_disable_writeprotect()

void usart_disable_writeprotect ( Usart * p_usart )

Disable write protect of USART registers.

Parameters

p_usart Pointer to a USART instance.

Definition at line 1907 of file usart.c.

◆ usart_drive_RTS_pin_high()

void usart_drive_RTS_pin_high ( Usart * p_usart )

Drive the pin RTS to 1.

Parameters

p_usart Pointer to a USART instance.

Definition at line 1624 of file usart.c.

◆ usart_drive_RTS_pin_low()

void usart_drive_RTS_pin_low ( Usart * p_usart )

Drive the pin RTS to 0.

Parameters

p_usart Pointer to a USART instance.

Definition at line 1614 of file usart.c.

◆ usart_enable_interrupt()

void usart_enable_interrupt	(	Usart *	p_usart,
		uint32_t	ul_sources
	)

Enable USART interrupts.

Parameters

p_usart	Pointer to a USART peripheral.
ul_sources	Interrupt sources bit map.

Definition at line 1469 of file usart.c.

◆ usart_enable_rx()

void usart_enable_rx ( Usart * p_usart )

Enable USART receiver.

Parameters

p_usart Pointer to a USART instance.

Definition at line 1426 of file usart.c.

◆ usart_enable_tx()

void usart_enable_tx ( Usart * p_usart )

Enable USART transmitter.

Parameters

p_usart Pointer to a USART instance.

Definition at line 1384 of file usart.c.

◆ usart_enable_writeprotect()

void usart_enable_writeprotect ( Usart * p_usart )

Enable write protect of USART registers.

Parameters

p_usart Pointer to a USART instance.

Definition at line 1897 of file usart.c.

◆ usart_get_error_number()

uint8_t usart_get_error_number ( Usart * p_usart )

Get the total number of errors that occur during an ISO7816 transfer.

Parameters

p_usart Pointer to a USART instance.

Returns: The number of errors that occurred.

Definition at line 699 of file usart.c.

◆ usart_get_interrupt_mask()

uint32_t usart_get_interrupt_mask ( Usart * p_usart )

Read USART interrupt mask.

Parameters

p_usart Pointer to a USART peripheral.

Returns: The interrupt mask value.

Definition at line 1492 of file usart.c.

◆ usart_get_pdc_base()

Pdc* usart_get_pdc_base ( Usart * p_usart )

Get USART PDC base address.

Parameters

p_usart Pointer to a UART instance.

Returns: USART PDC registers base for PDC driver to access.

Definition at line 1827 of file usart.c.

◆ usart_get_status()

uint32_t usart_get_status ( Usart * p_usart )

Get current status.

Parameters

p_usart Pointer to a USART instance.

Returns: The current USART status.

Definition at line 1504 of file usart.c.

◆ usart_get_writeprotect_status()

uint32_t usart_get_writeprotect_status ( Usart * p_usart )

Get write protect status.

Parameters

p_usart Pointer to a USART instance.

Returns: 0 if no write protect violation occurred, or 16-bit write protect violation source.

Definition at line 1920 of file usart.c.

◆ usart_getchar()

uint32_t usart_getchar	(	Usart *	p_usart,
		uint32_t *	c
	)

Read from USART Receive Holding Register. Before reading user should check if rx is ready.

Parameters

p_usart	Pointer to a USART instance.
c	Pointer where the one-byte received data will be stored.

Return values

0	Data has been received.
1	on failure.

Definition at line 1781 of file usart.c.

◆ usart_init_hw_handshaking()

uint32_t usart_init_hw_handshaking	(	Usart *	p_usart,
		const sam_usart_opt_t *	p_usart_opt,
		uint32_t	ul_mck
	)

Configure USART to work in hardware handshaking mode.

Note: By default, the transmitter and receiver aren't enabled.

Parameters

p_usart	Pointer to a USART instance.
p_usart_opt	Pointer to sam_usart_opt_t instance.
ul_mck	USART module input clock frequency.

Return values

0	on success.
1	on failure.

Definition at line 313 of file usart.c.

◆ usart_init_irda()

uint32_t usart_init_irda	(	Usart *	p_usart,
		const sam_usart_opt_t *	p_usart_opt,
		uint32_t	ul_mck
	)

Configure USART to work in IrDA mode.

Note: By default, the transmitter and receiver aren't enabled.

Parameters

p_usart	Pointer to a USART instance.
p_usart_opt	Pointer to sam_usart_opt_t instance.
ul_mck	USART module input clock frequency.

Return values

0	on success.
1	on failure.

Definition at line 490 of file usart.c.

◆ usart_init_iso7816()

uint32_t usart_init_iso7816	(	Usart *	p_usart,
		const usart_iso7816_opt_t *	p_usart_opt,
		uint32_t	ul_mck
	)

Configure USART to work in ISO7816 mode.

Note: By default, the transmitter and receiver aren't enabled.

Parameters

p_usart	Pointer to a USART instance.
p_usart_opt	Pointer to sam_usart_opt_t instance.
ul_mck	USART module input clock frequency.

Return values

0	on success.
1	on failure.

Definition at line 557 of file usart.c.

◆ usart_init_rs232()

uint32_t usart_init_rs232	(	Usart *	p_usart,
		const sam_usart_opt_t *	p_usart_opt,
		uint32_t	ul_mck
	)

Configure USART to work in RS232 mode.

Note: By default, the transmitter and receiver aren't enabled.

Parameters

p_usart	Pointer to a USART instance.
p_usart_opt	Pointer to sam_usart_opt_t instance.
ul_mck	USART module input clock frequency.

Return values

0	on success.
1	on failure.

Definition at line 274 of file usart.c.

◆ usart_init_rs485()

uint32_t usart_init_rs485	(	Usart *	p_usart,
		const sam_usart_opt_t *	p_usart_opt,
		uint32_t	ul_mck
	)

Configure USART to work in RS485 mode.

Note: By default, the transmitter and receiver aren't enabled.

Parameters

p_usart	Pointer to a USART instance.
p_usart_opt	Pointer to sam_usart_opt_t instance.
ul_mck	USART module input clock frequency.

Return values

0	on success.
1	on failure.

Definition at line 462 of file usart.c.

◆ usart_init_spi_master()

uint32_t usart_init_spi_master	(	Usart *	p_usart,
		const usart_spi_opt_t *	p_usart_opt,
		uint32_t	ul_mck
	)

Configure USART to work in SPI mode and act as a master.

Note: By default, the transmitter and receiver aren't enabled.

Parameters

p_usart	Pointer to a USART instance.
p_usart_opt	Pointer to sam_usart_opt_t instance.
ul_mck	USART module input clock frequency.

Return values

0	on success.
1	on failure.

Definition at line 718 of file usart.c.

◆ usart_init_spi_slave()

uint32_t usart_init_spi_slave	(	Usart *	p_usart,
		const usart_spi_opt_t *	p_usart_opt
	)

Configure USART to work in SPI mode and act as a slave.

Note: By default, the transmitter and receiver aren't enabled.

Parameters

p_usart	Pointer to a USART instance.
p_usart_opt	Pointer to sam_usart_opt_t instance.

Return values

0	on success.
1	on failure.

Definition at line 782 of file usart.c.

◆ usart_init_sync_master()

uint32_t usart_init_sync_master	(	Usart *	p_usart,
		const sam_usart_opt_t *	p_usart_opt,
		uint32_t	ul_mck
	)

Configure USART to work in SYNC mode and act as a master.

Note: By default, the transmitter and receiver aren't enabled.

Parameters

p_usart	Pointer to a USART instance.
p_usart_opt	Pointer to sam_usart_opt_t instance.
ul_mck	USART module input clock frequency.

Return values

0	on success.
1	on failure.

Definition at line 386 of file usart.c.

◆ usart_init_sync_slave()

uint32_t usart_init_sync_slave	(	Usart *	p_usart,
		const sam_usart_opt_t *	p_usart_opt
	)

Configure USART to work in SYNC mode and act as a slave.

Note: By default, the transmitter and receiver aren't enabled.

Parameters

p_usart	Pointer to a USART instance.
p_usart_opt	Pointer to sam_usart_opt_t instance.

Return values

0	on success.
1	on failure.

Definition at line 423 of file usart.c.

◆ usart_is_rx_buf_end()

uint32_t usart_is_rx_buf_end ( Usart * p_usart )

Check if one receive buffer is filled.

Parameters

p_usart Pointer to a USART instance.

Return values

1	Receive is complete.
0	Receive is still pending.

Definition at line 660 of file usart.c.

◆ usart_is_rx_buf_full()

uint32_t usart_is_rx_buf_full ( Usart * p_usart )

Check if both receive buffers are full.

Parameters

p_usart Pointer to a USART instance.

Return values

1	Receive buffers are full.
0	Receive buffers are not full.

Definition at line 646 of file usart.c.

◆ usart_is_rx_ready()

uint32_t usart_is_rx_ready ( Usart * p_usart )

Check if the received data are ready. Check if Data have been received and loaded into USART_RHR.

Parameters

p_usart Pointer to a USART instance.

Return values

1	Some data has been received.
0	No data has been received.

Definition at line 1688 of file usart.c.

◆ usart_is_tx_buf_empty()

uint32_t usart_is_tx_buf_empty ( Usart * p_usart )

Check if both transmit buffers are empty.

Parameters

p_usart Pointer to a USART instance.

Return values

1	Transmit buffers are empty.
0	Transmit buffers are not empty.

Definition at line 686 of file usart.c.

◆ usart_is_tx_buf_end()

uint32_t usart_is_tx_buf_end ( Usart * p_usart )

Check if one transmit buffer is empty.

Parameters

p_usart Pointer to a USART instance.

Return values

1	Transmit is complete.
0	Transmit is still pending.

Definition at line 673 of file usart.c.

◆ usart_is_tx_empty()

uint32_t usart_is_tx_empty ( Usart * p_usart )

Check if Transmit Holding Register is empty. Check if the last data written in USART_THR have been loaded in TSR and the last data loaded in TSR have been transmitted.

Parameters

p_usart Pointer to a USART instance.

Return values

1	Transmitter is empty.
0	Transmitter is not empty.

Definition at line 1674 of file usart.c.

◆ usart_is_tx_ready()

uint32_t usart_is_tx_ready ( Usart * p_usart )

Check if Transmit is Ready. Check if data have been loaded in USART_THR and are waiting to be loaded into the Transmit Shift Register (TSR).

Parameters

p_usart Pointer to a USART instance.

Return values

1	No data is in the Transmit Holding Register.
0	There is data in the Transmit Holding Register.

Definition at line 1659 of file usart.c.

◆ usart_putchar()

uint32_t usart_putchar	(	Usart *	p_usart,
		uint32_t	c
	)

Write to USART Transmit Holding Register.

Note: Before writing user should check if tx is ready (or empty).

Parameters

p_usart	Pointer to a USART instance.
c	Data to be sent.

Return values

0	on success.
1	on failure.

Definition at line 1725 of file usart.c.

◆ usart_read()

uint32_t usart_read	(	Usart *	p_usart,
		uint32_t *	c
	)

Read from USART Receive Holding Register.

Note: Before reading user should check if rx is ready.

Parameters

p_usart	Pointer to a USART instance.
c	Pointer where the one-byte received data will be stored.

Return values

0	on success.
1	if no data is available or errors.

Definition at line 1759 of file usart.c.

◆ usart_reset()

void usart_reset ( Usart * p_usart )

Reset the USART and disable TX and RX.

Parameters

p_usart Pointer to a USART instance.

Definition at line 240 of file usart.c.

◆ usart_reset_iterations()

void usart_reset_iterations ( Usart * p_usart )

Reset the ITERATION in US_CSR when the ISO7816 mode is enabled.

Parameters

p_usart Pointer to a USART instance.

Definition at line 623 of file usart.c.

◆ usart_reset_nack()

void usart_reset_nack ( Usart * p_usart )

Reset NACK in US_CSR.

Parameters

p_usart Pointer to a USART instance.

Definition at line 633 of file usart.c.

◆ usart_reset_rx()

void usart_reset_rx ( Usart * p_usart )

Immediately stop and disable USART receiver.

Parameters

p_usart Pointer to a USART instance.

Definition at line 1446 of file usart.c.

◆ usart_reset_status()

void usart_reset_status ( Usart * p_usart )

Reset status bits (PARE, OVER, MANERR, UNRE and PXBRK in US_CSR).

Parameters

p_usart Pointer to a USART instance.

Definition at line 1514 of file usart.c.

◆ usart_reset_tx()

void usart_reset_tx ( Usart * p_usart )

Immediately stop and disable USART transmitter.

Parameters

p_usart Pointer to a USART instance.

Definition at line 1404 of file usart.c.

◆ usart_restart_rx_timeout()

void usart_restart_rx_timeout ( Usart * p_usart )

Restart the receive timeout.

Parameters

p_usart Pointer to a USART instance.

Definition at line 1580 of file usart.c.

◆ usart_send_address()

uint32_t usart_send_address	(	Usart *	p_usart,
		uint32_t	ul_addr
	)

In Multidrop mode only, the next character written to the US_THR is sent with the address bit set.

Parameters

p_usart	Pointer to a USART instance.
ul_addr	The address to be sent out.

Return values

0	on success.
1	on failure.

Definition at line 1560 of file usart.c.

◆ usart_set_async_baudrate()

uint32_t usart_set_async_baudrate	(	Usart *	p_usart,
		uint32_t	baudrate,
		uint32_t	ul_mck
	)

Calculate a clock divider(CD) and a fractional part (FP) for the USART asynchronous modes to generate a baudrate as close as possible to the baudrate set point.

Note: Baud rate calculation: Baudrate = ul_mck/(Over * (CD + FP/8)) (Over being 16 or 8). The maximal oversampling is selected if it allows to generate a baudrate close to the set point.

Parameters

p_usart	Pointer to a USART instance.
baudrate	Baud rate set point.
ul_mck	USART module input clock frequency.

Return values

0	Baud rate is successfully initialized.
1	Baud rate set point is out of range for the given input clock frequency.

Definition at line 111 of file usart.c.

◆ usart_set_rx_timeout()

void usart_set_rx_timeout	(	Usart *	p_usart,
		uint32_t	timeout
	)

Configure the receive timeout register.

Parameters

p_usart	Pointer to a USART instance.
timeout	The value of receive timeout.

Definition at line 1458 of file usart.c.

◆ usart_set_tx_timeguard()

void usart_set_tx_timeguard	(	Usart *	p_usart,
		uint32_t	timeguard
	)

Configure the transmit timeguard register.

Parameters

p_usart	Pointer to a USART instance.
timeguard	The value of transmit timeguard.

Definition at line 1416 of file usart.c.

◆ usart_spi_force_chip_select()

void usart_spi_force_chip_select ( Usart * p_usart )

Drive the slave select line NSS (RTS pin) to 0 in SPI master mode.

Parameters

p_usart Pointer to a USART instance.

Definition at line 1634 of file usart.c.

◆ usart_spi_release_chip_select()

void usart_spi_release_chip_select ( Usart * p_usart )

Drive the slave select line NSS (RTS pin) to 1 in SPI master mode.

Parameters

p_usart Pointer to a USART instance.

Definition at line 1644 of file usart.c.

◆ usart_start_rx_timeout()

void usart_start_rx_timeout ( Usart * p_usart )

Start waiting for a character before clocking the timeout count. Reset the status bit TIMEOUT in US_CSR.

Parameters

p_usart Pointer to a USART instance.

Definition at line 1545 of file usart.c.

◆ usart_start_tx_break()

void usart_start_tx_break ( Usart * p_usart )

Start transmission of a break.

Parameters

p_usart Pointer to a USART instance.

Definition at line 1524 of file usart.c.

◆ usart_stop_tx_break()

void usart_stop_tx_break ( Usart * p_usart )

Stop transmission of a break.

Parameters

p_usart Pointer to a USART instance.

Definition at line 1534 of file usart.c.

◆ usart_write()

uint32_t usart_write	(	Usart *	p_usart,
		uint32_t	c
	)

Write to USART Transmit Holding Register.

Note: Before writing user should check if tx is ready (or empty).

Parameters

p_usart	Pointer to a USART instance.
c	Data to be sent.

Return values

0	on success.
1	on failure.

Definition at line 1704 of file usart.c.

◆ usart_write_line()

void usart_write_line	(	Usart *	p_usart,
		const char *	string
	)

Write one-line string through USART.

Parameters

p_usart	Pointer to a USART instance.
string	Pointer to one-line string to be sent.

Definition at line 1741 of file usart.c.

Classes

Macros

Functions

Detailed Description

Macro Definition Documentation

◆ SPI_CPHA

◆ SPI_CPOL

◆ SPI_MODE_0

◆ SPI_MODE_1

◆ SPI_MODE_2

◆ SPI_MODE_3

Function Documentation

◆ usart_disable_interrupt()

◆ usart_disable_rx()

◆ usart_disable_tx()

◆ usart_disable_writeprotect()

◆ usart_drive_RTS_pin_high()

◆ usart_drive_RTS_pin_low()

◆ usart_enable_interrupt()

◆ usart_enable_rx()

◆ usart_enable_tx()

◆ usart_enable_writeprotect()

◆ usart_get_error_number()

◆ usart_get_interrupt_mask()

◆ usart_get_pdc_base()

◆ usart_get_status()

◆ usart_get_writeprotect_status()

◆ usart_getchar()

◆ usart_init_hw_handshaking()

◆ usart_init_irda()

◆ usart_init_iso7816()

◆ usart_init_rs232()

◆ usart_init_rs485()

◆ usart_init_spi_master()

◆ usart_init_spi_slave()

◆ usart_init_sync_master()

◆ usart_init_sync_slave()

◆ usart_is_rx_buf_end()

◆ usart_is_rx_buf_full()

◆ usart_is_rx_ready()

◆ usart_is_tx_buf_empty()

◆ usart_is_tx_buf_end()

◆ usart_is_tx_empty()

◆ usart_is_tx_ready()

◆ usart_putchar()

◆ usart_read()

◆ usart_reset()

◆ usart_reset_iterations()

◆ usart_reset_nack()

◆ usart_reset_rx()

◆ usart_reset_status()

◆ usart_reset_tx()

◆ usart_restart_rx_timeout()

◆ usart_send_address()

◆ usart_set_async_baudrate()

◆ usart_set_rx_timeout()

◆ usart_set_tx_timeguard()

◆ usart_spi_force_chip_select()

◆ usart_spi_release_chip_select()

◆ usart_start_rx_timeout()

◆ usart_start_tx_break()

◆ usart_stop_tx_break()

◆ usart_write()

◆ usart_write_line()