Class providing buffered UART communication functionality using separate circular buffer for send and receive channels. More...

#include <UARTSerial.h>

Inherits mbed::SerialBase, mbed::FileHandle, and NonCopyable< UARTSerial >.

Public Member Functions
	UARTSerial (PinName tx, PinName rx, int baud=MBED_CONF_PLATFORM_DEFAULT_SERIAL_BAUD_RATE)
	Create a UARTSerial port, connected to the specified transmit and receive pins, with a particular baud rate.
virtual short	poll (short events) const
	Equivalent to POSIX poll().
virtual ssize_t	write (const void *buffer, size_t length)
	Write the contents of a buffer to a file.
virtual ssize_t	read (void *buffer, size_t length)
	Read the contents of a file into a buffer.
virtual int	close ()
	Close a file.
virtual int	isatty ()
	Check if the file in an interactive terminal device.
virtual off_t	seek (off_t offset, int whence)
	Move the file position to a given offset from from a given location.
virtual int	sync ()
	Flush any buffers associated with the file.
virtual int	set_blocking (bool blocking)
	Set blocking or non-blocking mode The default is blocking.
virtual bool	is_blocking () const
	Check current blocking or non-blocking mode for file operations.
virtual void	sigio (Callback< void()> func)
	Register a callback on state change of the file.
void	set_data_carrier_detect (PinName dcd_pin, bool active_high=false)
	Setup interrupt handler for DCD line.
void	set_baud (int baud)
	Set the baud rate.
void	set_format (int bits=8, Parity parity=UARTSerial::None, int stop_bits=1)
	Set the transmission format used by the serial port.
void	set_flow_control (Flow type, PinName flow1=NC, PinName flow2=NC)
	Set the flow control type on the serial port.
virtual off_t	tell ()
	Get the file position of the file.
virtual void	rewind ()
	Rewind the file position to the beginning of the file.
virtual off_t	size ()
	Get the size of the file.
	MBED_DEPRECATED_SINCE ("mbed-os-5.4","Replaced by FileHandle::seek") virtual off_t lseek(off_t offset
	Move the file position to a given offset from a given location.
Protected Member Functions
	MBED_DEPRECATED ("Invalid copy construction of a NonCopyable resource.") NonCopyable(const NonCopyable &)
	NonCopyable copy constructor.
	MBED_DEPRECATED ("Invalid copy assignment of a NonCopyable resource.") NonCopyable &operator
	NonCopyable copy assignment operator.
Private Member Functions
void	baud (int baudrate)
	Set the baud rate of the serial port.
void	format (int bits=8, Parity parity=SerialBase::None, int stop_bits=1)
	Set the transmission format used by the serial port.
int	readable ()
	Determine if there is a character available to read.
int	writeable ()
	Determine if there is space available to write a character.
void	attach (Callback< void()> func, IrqType type=RxIrq)
	Attach a function to call whenever a serial interrupt is generated.
template<typename T >
	MBED_DEPRECATED_SINCE ("mbed-os-5.1","The attach function does not support cv-qualifiers. Replaced by ""attach(callback(obj, method), type).") void attach(T *obj
	Attach a member function to call whenever a serial interrupt is generated.
int	write (const uint8_t *buffer, int length, const event_callback_t &callback, int event=SERIAL_EVENT_TX_COMPLETE)
	Begin asynchronous write using 8bit buffer.
int	write (const uint16_t *buffer, int length, const event_callback_t &callback, int event=SERIAL_EVENT_TX_COMPLETE)
	Begin asynchronous write using 16bit buffer.
void	abort_write ()
	Abort the on-going write transfer.
int	read (uint8_t *buffer, int length, const event_callback_t &callback, int event=SERIAL_EVENT_RX_COMPLETE, unsigned char char_match=SERIAL_RESERVED_CHAR_MATCH)
	Begin asynchronous reading using 8bit buffer.
int	read (uint16_t *buffer, int length, const event_callback_t &callback, int event=SERIAL_EVENT_RX_COMPLETE, unsigned char char_match=SERIAL_RESERVED_CHAR_MATCH)
	Begin asynchronous reading using 16bit buffer.
void	abort_read ()
	Abort the on-going read transfer.
int	set_dma_usage_tx (DMAUsage usage)
	Configure DMA usage suggestion for non-blocking TX transfers.
int	set_dma_usage_rx (DMAUsage usage)
	Configure DMA usage suggestion for non-blocking RX transfers.
	MBED_DEPRECATED ("Invalid copy construction of a NonCopyable resource.") NonCopyable(const NonCopyable &)
	NonCopyable copy constructor.
	MBED_DEPRECATED ("Invalid copy assignment of a NonCopyable resource.") NonCopyable &operator
	NonCopyable copy assignment operator.

Detailed Description

Class providing buffered UART communication functionality using separate circular buffer for send and receive channels.

Definition at line 49 of file UARTSerial.h.

Constructor & Destructor Documentation

UARTSerial	(	PinName	tx,
		PinName	rx,
		int	baud = `MBED_CONF_PLATFORM_DEFAULT_SERIAL_BAUD_RATE`
	)

Create a UARTSerial port, connected to the specified transmit and receive pins, with a particular baud rate.

Parameters:

tx	Transmit pin
rx	Receive pin
baud	The baud rate of the serial port (optional, defaults to MBED_CONF_PLATFORM_DEFAULT_SERIAL_BAUD_RATE)

Member Function Documentation

virtual int close ( ) [virtual]

Close a file.

Returns:: 0 on success, negative error code on failure

Implements FileHandle.

virtual bool is_blocking ( ) const [virtual]

Check current blocking or non-blocking mode for file operations.

Returns:: true for blocking mode, false for non-blocking mode.

Definition at line 149 of file UARTSerial.h.

virtual int isatty ( ) [virtual]

Check if the file in an interactive terminal device.

Returns:: True if the file is a terminal; False if the file is not a terminal; Negative error code on failure

Reimplemented from FileHandle.

MBED_DEPRECATED ( "Invalid copy construction of a NonCopyable< FileHandle > resource." ) const [protected, inherited]

NonCopyable copy constructor.

A compile time warning is issued when this function is used, and a runtime warning is printed when the copy construction of the noncopyable happens.

If you see this warning, your code is probably doing something unspecified. Copying of noncopyable resources can lead to resource leak and random error.

Definition at line 189 of file NonCopyable.h.

MBED_DEPRECATED ( "Invalid copy assignment of a NonCopyable< FileHandle > resource." ) [protected, inherited]

NonCopyable copy assignment operator.

A compile time warning is issued when this function is used, and a runtime warning is printed when the copy construction of the noncopyable happens.

If you see this warning, your code is probably doing something unspecified. Copying of noncopyable resources can lead to resource leak and random error.

MBED_DEPRECATED_SINCE	(	"mbed-os-5.4"	,
		"Replaced by FileHandle::seek"
	)		`[inherited]`

Move the file position to a given offset from a given location.

Parameters:

offset	The offset from whence to move to
whence	SEEK_SET for the start of the file, SEEK_CUR for the current file position, or SEEK_END for the end of the file.

Returns:: new file position on success, -1 on failure or unsupported

virtual short poll ( short events ) const [virtual]

Equivalent to POSIX poll().

Derived from FileHandle. Provides a mechanism to multiplex input/output over a set of file handles.

virtual ssize_t read	(	void *	buffer,
		size_t	length
	)		`[virtual]`

Read the contents of a file into a buffer.

Follows POSIX semantics:

* if no data is available, and non-blocking set return -EAGAIN * if no data is available, and blocking set, wait until data is available * If any data is available, call returns immediately

Parameters:

buffer	The buffer to read in to
length	The number of bytes to read

Returns:: The number of bytes read, 0 at end of file, negative error on failure

Implements FileHandle.

virtual void rewind ( ) [virtual, inherited]

Rewind the file position to the beginning of the file.

Note:: This is equivalent to seek(0, SEEK_SET)

Reimplemented in Stream.

Definition at line 129 of file FileHandle.h.

virtual off_t seek	(	off_t	offset,
		int	whence
	)		`[virtual]`

Move the file position to a given offset from from a given location.

Not valid for a device type FileHandle like UARTSerial. In case of UARTSerial, returns ESPIPE

Parameters:

offset	The offset from whence to move to
whence	The start of where to seek SEEK_SET to start from beginning of file, SEEK_CUR to start from current position in file, SEEK_END to start from end of file

Returns:: The new offset of the file, negative error code on failure

Implements FileHandle.

void set_baud ( int baud )

Set the baud rate.

Parameters:

baud	The baud rate

virtual int set_blocking ( bool blocking ) [virtual]

Set blocking or non-blocking mode The default is blocking.

Parameters:

blocking true for blocking mode, false for non-blocking mode.

Definition at line 139 of file UARTSerial.h.

void set_data_carrier_detect	(	PinName	dcd_pin,
		bool	active_high = `false`
	)

Setup interrupt handler for DCD line.

If DCD line is connected, an IRQ handler will be setup. Does nothing if DCD is NC, i.e., not connected.

Parameters:

dcd_pin	Pin-name for DCD
active_high	a boolean set to true if DCD polarity is active low

void set_flow_control	(	Flow	type,
		PinName	flow1 = `NC`,
		PinName	flow2 = `NC`
	)

Set the flow control type on the serial port.

Parameters:

type	the flow control type (Disabled, RTS, CTS, RTSCTS)
flow1	the first flow control pin (RTS for RTS or RTSCTS, CTS for CTS)
flow2	the second flow control pin (CTS for RTSCTS)

Reimplemented from SerialBase.

void set_format	(	int	bits = `8`,
		Parity	parity = `UARTSerial::None`,
		int	stop_bits = `1`
	)

Set the transmission format used by the serial port.

Parameters:

bits	The number of bits in a word (5-8; default = 8)
parity	The parity used (None, Odd, Even, Forced1, Forced0; default = None)
stop_bits	The number of stop bits (1 or 2; default = 1)

virtual void sigio ( Callback< void()> func ) [virtual]

Register a callback on state change of the file.

The specified callback will be called on state changes such as when the file can be written to or read from.

The callback may be called in an interrupt context and should not perform expensive operations.

Note! This is not intended as an attach-like asynchronous api, but rather as a building block for constructing such functionality.

The exact timing of when the registered function is called is not guaranteed and susceptible to change. It should be used as a cue to make read/write/poll calls to find the current state.

Parameters:

func	Function to call on state change

virtual off_t size ( ) [virtual, inherited]

Get the size of the file.

Returns:: Size of the file in bytes

Reimplemented in Stream.

virtual int sync ( ) [virtual]

Flush any buffers associated with the file.

Returns:: 0 on success, negative error code on failure

Reimplemented from FileHandle.

virtual off_t tell ( ) [virtual, inherited]

Get the file position of the file.

Note:: This is equivalent to seek(0, SEEK_CUR)

Returns:: The current offset in the file, negative error code on failure

Reimplemented in Stream.

Definition at line 120 of file FileHandle.h.

virtual ssize_t write	(	const void *	buffer,
		size_t	length
	)		`[virtual]`

Write the contents of a buffer to a file.

Follows POSIX semantics:

* if blocking, block until all data is written * if no data can be written, and non-blocking set, return -EAGAIN * if some data can be written, and non-blocking set, write partial

Parameters:

buffer	The buffer to write from
length	The number of bytes to write

Returns:: The number of bytes written, negative error on failure

Implements FileHandle.

Type:	Program
Created:	06 Jun 2019
Imports:	3
Forks:	0
Commits:	4
Dependents:	0
Dependencies:	1
Followers:	3

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UARTSerial Class Reference
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UARTSerial Class Reference
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