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Public Member Functions | Protected Member Functions
USBSerial Class Reference

USBSerial example. More...

#include <USBSerial.h>

Inheritance diagram for USBSerial:
USBCDC Stream USBDevice FileLike NonCopyable< Stream > USBPhyEvents FileHandle FileBase NonCopyable< FileLike > NonCopyable< FileHandle > NonCopyable< FileBase >

Public Member Functions

 USBSerial (bool connect_blocking=true, uint16_t vendor_id=0x1f00, uint16_t product_id=0x2012, uint16_t product_release=0x0001)
 Basic constructor. More...
 
 USBSerial (USBPhy *phy, uint16_t vendor_id=0x1f00, uint16_t product_id=0x2012, uint16_t product_release=0x0001)
 Fully featured constructor. More...
 
virtual ~USBSerial ()
 Destroy this object. More...
 
virtual int _putc (int c)
 Send a character. More...
 
virtual int _getc ()
 Read a character: blocking. More...
 
uint8_t available ()
 Check the number of bytes available. More...
 
bool connected ()
 Check if the terminal is connected. More...
 
int readable ()
 Determine if there is a character available to read. More...
 
int writeable ()
 Determine if there is space available to write a character. More...
 
template<typename T >
void attach (T *tptr, void(T::*mptr)(void))
 Attach a member function to call when a packet is received. More...
 
void attach (void(*fptr)(void))
 Attach a callback called when a packet is received. More...
 
void attach (mbed::Callback< void()> &cb)
 Attach a Callback called when a packet is received. More...
 
void attach (void(*fptr)(int baud, int bits, int parity, int stop))
 Attach a callback to call when serial's settings are changed. More...
 
bool ready ()
 Check if this class is ready. More...
 
void wait_ready ()
 Block until the terminal is connected. More...
 
void send_nb (uint8_t *buffer, uint32_t size, uint32_t *actual, bool now=true)
 Send what there is room for. More...
 
void receive_nb (uint8_t *buffer, uint32_t size, uint32_t *actual)
 Read from the receive buffer. More...
 
void init ()
 Initialize this instance. More...
 
void deinit ()
 Power down this instance. More...
 
bool configured ()
 Check if the device is configured. More...
 
void connect ()
 Connect a device. More...
 
void disconnect ()
 Disconnect a device. More...
 
void sof_enable ()
 Enable the start of frame interrupt. More...
 
void sof_disable ()
 Disable the start of frame interrupt. More...
 
bool endpoint_add (usb_ep_t endpoint, uint32_t max_packet, usb_ep_type_t type, ep_cb_t callback=NULL)
 Add an endpoint. More...
 
template<typename T >
bool endpoint_add (usb_ep_t endpoint, uint32_t max_packet, usb_ep_type_t type, void(T::*callback)())
 Add an endpoint. More...
 
void endpoint_remove (usb_ep_t endpoint)
 Remove an endpoint. More...
 
void endpoint_remove_all ()
 Remove all non-zero endpoints. More...
 
void endpoint_stall (usb_ep_t endpoint)
 Stall an endpoint. More...
 
void endpoint_unstall (usb_ep_t endpoint)
 Unstall an endpoint. More...
 
uint32_t endpoint_max_packet_size (usb_ep_t endpoint)
 Get the current maximum size for this endpoint. More...
 
void endpoint_abort (usb_ep_t endpoint)
 Abort the current transfer on this endpoint. More...
 
bool read_start (usb_ep_t endpoint, uint8_t *buffer, uint32_t size)
 start a read on the given endpoint More...
 
uint32_t read_finish (usb_ep_t endpoint)
 Get the status of a read. More...
 
bool write_start (usb_ep_t endpoint, uint8_t *buffer, uint32_t size)
 Write a data to the given endpoint. More...
 
uint32_t write_finish (usb_ep_t endpoint)
 Get the status of a write. More...
 
virtual int truncate (off_t length)
 Truncate or extend a file. More...
 
virtual off_t lseek (off_t offset, int whence)
 Move the file position to a given offset from a given location. More...
 
virtual int fsync ()
 Flush any buffers associated with the FileHandle, ensuring it is up to date on disk. More...
 
virtual off_t flen ()
 Find the length of the file. More...
 
virtual int set_blocking (bool blocking)
 Set blocking or nonblocking mode of the file operation like read/write. More...
 
virtual bool is_blocking () const
 Check current blocking or nonblocking mode for file operations. More...
 
virtual int enable_input (bool enabled)
 Enable or disable input. More...
 
virtual int enable_output (bool enabled)
 Enable or disable output. More...
 
virtual short poll (short events) const
 Check for poll event flags You can use or ignore the input parameter. More...
 
bool writable () const
 Definition depends on the subclass implementing FileHandle. More...
 
bool readable () const
 Definition depends on the subclass implementing FileHandle. More...
 
virtual void sigio (Callback< void()> func)
 Register a callback on state change of the file. More...
 

Protected Member Functions

virtual void callback_reset ()
 Called by USBDevice layer on bus reset. More...
 
virtual void callback_state_change (DeviceState new_state)
 Called when USB changes state. More...
 
virtual void callback_request (const setup_packet_t *setup)
 Called by USBDevice on Endpoint0 request. More...
 
virtual void callback_request_xfer_done (const setup_packet_t *setup, bool aborted)
 Called by USBDevice on data stage completion. More...
 
virtual void callback_power (bool powered)
 Called by USBDevice layer on power state change. More...
 
virtual void callback_sof (int frame_number)
 Called by USBDevice layer on each new USB frame. More...
 
void complete_request (RequestResult result, uint8_t *data=NULL, uint32_t size=0)
 Called to complete the setup stage of a callback request. More...
 
void complete_request_xfer_done (bool success)
 Called to complete the data stage of a callback request. More...
 
void complete_set_configuration (bool success)
 Called to complete a set configuration command. More...
 
void complete_set_interface (bool success)
 Called to complete a set interface command. More...
 
uint8_t * find_descriptor (uint8_t descriptor_type, uint8_t index=0)
 Find a descriptor type inside the configuration descriptor. More...
 
const usb_ep_table_tendpoint_table ()
 Get the endpoint table of this device. More...
 
virtual void start_process ()
 Callback called to indicate the USB processing needs to be done. More...
 
virtual void lock ()
 Acquire exclusive access to this instance USBDevice. More...
 
virtual void unlock ()
 Release exclusive access to this instance USBDevice. More...
 
virtual void assert_locked ()
 Assert that the current thread of execution holds the lock. More...
 
virtual int close ()
 Close a file. More...
 
virtual ssize_t write (const void *buffer, size_t length)
 Write the contents of a buffer to a file. More...
 
virtual ssize_t read (void *buffer, size_t length)
 Read the contents of a file into a buffer. More...
 
virtual off_t seek (off_t offset, int whence)
 Move the file position to a given offset from from a given location. More...
 
virtual off_t tell ()
 Get the file position of the file. More...
 
virtual void rewind ()
 Rewind the file position to the beginning of the file. More...
 
virtual int isatty ()
 Check if the file in an interactive terminal device. More...
 
virtual int sync ()
 Flush any buffers associated with the file. More...
 
virtual off_t size ()
 Get the size of the file. More...
 
virtual void lock ()
 Acquire exclusive access to this object. More...
 
virtual void unlock ()
 Release exclusive access to this object. More...
 

Detailed Description

USBSerial example.

#include "mbed.h"
#include "USBSerial.h"
//Virtual serial port over USB
USBSerial serial;
int main(void) {
while(1)
{
serial.printf("I am a virtual serial port\n");
wait(1);
}
}

Definition at line 45 of file USBSerial.h.

Constructor & Destructor Documentation

USBSerial ( bool  connect_blocking = true,
uint16_t  vendor_id = 0x1f00,
uint16_t  product_id = 0x2012,
uint16_t  product_release = 0x0001 
)

Basic constructor.

Construct this object optionally connecting and blocking until it is ready.

Note
Do not use this constructor in derived classes.
Parameters
connect_blockingtrue to perform a blocking connect, false to start in a disconnected state
vendor_idYour vendor_id (default: 0x1f00)
product_idYour product_id (default: 0x2012)
product_releaseYour product_release (default: 0x0001)
USBSerial ( USBPhy phy,
uint16_t  vendor_id = 0x1f00,
uint16_t  product_id = 0x2012,
uint16_t  product_release = 0x0001 
)

Fully featured constructor.

Construct this object with the supplied USBPhy and parameters. The user this object is responsible for calling connect() or init().

Note
Derived classes must use this constructor and call init() or connect() themselves. Derived classes should also call deinit() in their destructor. This ensures that no interrupts can occur when the object is partially constructed or destroyed.
Parameters
phyUSB phy to use
vendor_idYour vendor_id (default: 0x1f00)
product_idYour product_id (default: 0x2012)
product_releaseYour product_release (default: 0x0001)
virtual ~USBSerial ( )
virtual

Destroy this object.

Any classes which inherit from this class must call deinit before this destructor runs.

Member Function Documentation

virtual int _getc ( )
virtual

Read a character: blocking.

Returns
character read

Implements Stream.

virtual int _putc ( int  c)
virtual

Send a character.

You can use puts, printf.

Parameters
ccharacter to be sent
Returns
true if there is no error, false otherwise

Implements Stream.

virtual void assert_locked ( )
protectedvirtualinherited

Assert that the current thread of execution holds the lock.

void attach ( T *  tptr,
void(T::*)(void)  mptr 
)

Attach a member function to call when a packet is received.

Parameters
tptrpointer to the object to call the member function on
mptrpointer to the member function to be called

Definition at line 148 of file USBSerial.h.

void attach ( void(*)(void)  fptr)

Attach a callback called when a packet is received.

Parameters
fptrfunction pointer

Definition at line 164 of file USBSerial.h.

void attach ( mbed::Callback< void()> &  cb)

Attach a Callback called when a packet is received.

Parameters
cbCallback to attach

Definition at line 180 of file USBSerial.h.

void attach ( void(*)(int baud, int bits, int parity, int stop)  fptr)

Attach a callback to call when serial's settings are changed.

Parameters
fptrfunction pointer

Definition at line 194 of file USBSerial.h.

uint8_t available ( )

Check the number of bytes available.

Returns
the number of bytes available
virtual void callback_power ( bool  powered)
protectedvirtualinherited

Called by USBDevice layer on power state change.

Parameters
poweredtrue if device is powered, false otherwise

Warning: Called in ISR context

Definition at line 340 of file USBDevice.h.

virtual void callback_request ( const setup_packet_t setup)
protectedvirtualinherited

Called by USBDevice on Endpoint0 request.

This is used to handle extensions to standard requests and class specific requests. The function complete_request must be always be called in response to this callback.

Warning: Called in ISR context

Implements USBDevice.

virtual void callback_request_xfer_done ( const setup_packet_t setup,
bool  aborted 
)
protectedvirtualinherited

Called by USBDevice on data stage completion.

The function complete_request_xfer_done must be always be called in response to this callback.

Parameters
setupSetup packet of the current request
abortedfalse if the operation was aborted, true otherwise

Warning: Called in ISR context

Implements USBDevice.

virtual void callback_reset ( )
protectedvirtualinherited

Called by USBDevice layer on bus reset.

complete_reset must be called after the device is fully reset.

Warning: Called in ISR context

Reimplemented from USBDevice.

virtual void callback_sof ( int  frame_number)
protectedvirtualinherited

Called by USBDevice layer on each new USB frame.

Callbacks are enabled and disabled by calling sof_enable and sof_disable.

Parameters
frame_numberThe current frame number

Warning: Called in ISR context

Definition at line 355 of file USBDevice.h.

virtual void callback_state_change ( DeviceState  new_state)
protectedvirtualinherited

Called when USB changes state.

Parameters
new_stateThe new state of the USBDevice

Warning: Called in ISR context

Implements USBDevice.

virtual int close ( )
protectedvirtualinherited

Close a file.

Returns
0 on success, negative error code on failure

Implements FileHandle.

void complete_request ( RequestResult  result,
uint8_t *  data = NULL,
uint32_t  size = 0 
)
protectedinherited

Called to complete the setup stage of a callback request.

Possible options that can be passed as a result are:

  • Receive - Start the data OUT phase of this control transfer
  • Send - Start the data IN phase of this control transfer
  • Success - Operation was a success so start the status phase
  • Failure - Operation failed or is unsupported so send a stall
  • PassThrough - Pass on the request for standard processing
Parameters
resultThe result of the setup phase.
dataBuffer to send or receive if the result is Send or Receive
sizeSize to transfer if the result is Send or Receive
void complete_request_xfer_done ( bool  success)
protectedinherited

Called to complete the data stage of a callback request.

Parameters
successtrue if the operation was successful, false otherwise
void complete_set_configuration ( bool  success)
protectedinherited

Called to complete a set configuration command.

Parameters
successtrue if the configuration was set, false otherwise
void complete_set_interface ( bool  success)
protectedinherited

Called to complete a set interface command.

Parameters
successtrue if the interface was set, false otherwise
bool configured ( )
inherited

Check if the device is configured.

Returns
true if configured, false otherwise
void connect ( )
inherited

Connect a device.

bool connected ( )

Check if the terminal is connected.

Returns
connection status
void deinit ( )
inherited

Power down this instance.

Disable interrupts and stop sending events.

void disconnect ( )
inherited

Disconnect a device.

virtual int enable_input ( bool  enabled)
virtualinherited

Enable or disable input.

Control enabling of device for input. This is primarily intended for temporary power-saving; the overall ability of the device to operate for input and/or output may be fixed at creation time, but this call can allow input to be temporarily disabled to permit power saving without losing device state.

Parameters
enabledtrue to enable input, false to disable.
Returns
0 on success
Negative error code on failure

Reimplemented in UARTSerial.

Definition at line 236 of file FileHandle.h.

virtual int enable_output ( bool  enabled)
virtualinherited

Enable or disable output.

Control enabling of device for output. This is primarily intended for temporary power-saving; the overall ability of the device to operate for input and/or output may be fixed at creation time, but this call can allow output to be temporarily disabled to permit power saving without losing device state.

Parameters
enabledtrue to enable output, false to disable.
Returns
0 on success
Negative error code on failure

Reimplemented in UARTSerial.

Definition at line 254 of file FileHandle.h.

void endpoint_abort ( usb_ep_t  endpoint)
inherited

Abort the current transfer on this endpoint.

Parameters
endpointendpoint with transfer to abort
Note
This endpoint must already have been setup with endpoint_add
bool endpoint_add ( usb_ep_t  endpoint,
uint32_t  max_packet,
usb_ep_type_t  type,
ep_cb_t  callback = NULL 
)
inherited

Add an endpoint.

Parameters
endpointEndpoint to enable
max_packetMaximum size of a packet which can be sent or received on this endpoint
typeEndpoint type - USB_EP_TYPE_BULK, USB_EP_TYPE_INT or USB_EP_TYPE_ISO
callbackMethod pointer to be called when a packet is transferred
Returns
true if successful, false otherwise
bool endpoint_add ( usb_ep_t  endpoint,
uint32_t  max_packet,
usb_ep_type_t  type,
void(T::*)()  callback 
)
inherited

Add an endpoint.

Parameters
endpointEndpoint to enable
max_packetMaximum size of a packet which can be sent or received on this endpoint
typeEndpoint type - USB_EP_TYPE_BULK, USB_EP_TYPE_INT or USB_EP_TYPE_ISO
callbackMethod pointer to be called when a packet is transferred
Returns
true if successful, false otherwise

Definition at line 160 of file USBDevice.h.

uint32_t endpoint_max_packet_size ( usb_ep_t  endpoint)
inherited

Get the current maximum size for this endpoint.

Return the currently configured maximum packet size, wMaxPacketSize, for this endpoint.

Note
This endpoint must already have been setup with endpoint_add
void endpoint_remove ( usb_ep_t  endpoint)
inherited

Remove an endpoint.

Parameters
endpointEndpoint to disable
Note
This endpoint must already have been setup with endpoint_add
void endpoint_remove_all ( )
inherited

Remove all non-zero endpoints.

void endpoint_stall ( usb_ep_t  endpoint)
inherited

Stall an endpoint.

If there is an ongoing transfer on this endpoint then it will be aborted.

Parameters
endpointEndpoint to stall
Note
You cannot stall endpoint 0 with this function
This endpoint must already have been setup with endpoint_add
const usb_ep_table_t* endpoint_table ( )
protectedinherited

Get the endpoint table of this device.

Returns
Endpoint table of the USBPhy attached to this USBDevice
void endpoint_unstall ( usb_ep_t  endpoint)
inherited

Unstall an endpoint.

Unstalling an endpoint resets data toggle back to DATA0. Additionally, if there is an ongoing transfer on this endpoint it will be aborted.

Parameters
endpointEndpoint to unstall
Note
This endpoint must already have been setup with endpoint_add
uint8_t* find_descriptor ( uint8_t  descriptor_type,
uint8_t  index = 0 
)
protectedinherited

Find a descriptor type inside the configuration descriptor.

Parameters
descriptor_typeType of descriptor to find
indexConfiguration descriptor index ( 0 if only one configuration present )
Returns
A descriptor of the given type or NULL if none were found
virtual off_t flen ( )
virtualinherited

Find the length of the file.

Returns
Length of the file
Deprecated:
Replaced by `off_t FileHandle::size()'

Definition at line 195 of file FileHandle.h.

virtual int fsync ( )
virtualinherited

Flush any buffers associated with the FileHandle, ensuring it is up to date on disk.

Returns
0 on success or un-needed, -1 on error
Deprecated:
Replaced by `int FileHandle::sync()'

Definition at line 183 of file FileHandle.h.

void init ( )
inherited

Initialize this instance.

This function must be called before calling any other functions of this class, unless specifically

virtual bool is_blocking ( ) const
virtualinherited

Check current blocking or nonblocking mode for file operations.

Returns
true for blocking mode, false for nonblocking mode.

Reimplemented in UARTSerial.

Definition at line 218 of file FileHandle.h.

virtual int isatty ( )
protectedvirtualinherited

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.

virtual void lock ( void  )
protectedvirtualinherited

Acquire exclusive access to this object.

Definition at line 80 of file Stream.h.

virtual void lock ( )
protectedvirtualinherited

Acquire exclusive access to this instance USBDevice.

virtual off_t lseek ( off_t  offset,
int  whence 
)
virtualinherited

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

Parameters
offsetThe offset from whence to move to
whenceSEEK_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
Deprecated:
Replaced by `off_t FileHandle::seek(off_t offset, int whence = SEEK_SET)'

Definition at line 169 of file FileHandle.h.

virtual short poll ( short  events) const
virtualinherited

Check for poll event flags You can use or ignore the input parameter.

You can return all events or check just the events listed in events. Call is nonblocking - returns instantaneous state of events. Whenever an event occurs, the derived class should call the sigio() callback).

Parameters
eventsbitmask of poll events we're interested in - POLLIN/POLLOUT etc.
Returns
bitmask of poll events that have occurred.

Reimplemented in UARTSerial.

Definition at line 269 of file FileHandle.h.

virtual ssize_t read ( void *  buffer,
size_t  size 
)
protectedvirtualinherited

Read the contents of a file into a buffer.

Devices acting as FileHandles should follow POSIX semantics:

  • if no data is available, and nonblocking set, return -EAGAIN
  • if no data is available, and blocking set, wait until some data is available
  • If any data is available, call returns immediately
Parameters
bufferThe buffer to read in to
sizeThe number of bytes to read
Returns
The number of bytes read, 0 at end of file, negative error on failure

Implements FileHandle.

uint32_t read_finish ( usb_ep_t  endpoint)
inherited

Get the status of a read.

Parameters
endpointendpoint to get the status of
Returns
number of bytes read by this endpoint
bool read_start ( usb_ep_t  endpoint,
uint8_t *  buffer,
uint32_t  size 
)
inherited

start a read on the given endpoint

Start a read on the given endpoint. The data buffer must remain unchanged until the transfer either completes or is aborted.

Parameters
endpointendpoint to read data from
bufferbuffer to fill with read data
sizeThe size of data to read. This must be greater than or equal to the max packet size for this endpoint
Returns
true if the read was completed, otherwise false
Note
This endpoint must already have been setup with endpoint_add
int readable ( )

Determine if there is a character available to read.

Returns
1 if there is a character available to read, 0 otherwise

Definition at line 125 of file USBSerial.h.

bool readable ( ) const
inherited

Definition depends on the subclass implementing FileHandle.

For example, if the FileHandle is of type Stream, readable() could return true when there is something available to read.

Returns
true when there is something available to read.

Definition at line 292 of file FileHandle.h.

bool ready ( )
inherited

Check if this class is ready.

Returns
true if a terminal is connected, false otherwise
void receive_nb ( uint8_t *  buffer,
uint32_t  size,
uint32_t *  actual 
)
inherited

Read from the receive buffer.

Parameters
bufferbuffer to fill with data
sizemaximum number of bytes read
actuala pointer to where to store the number of bytes actually received
virtual void rewind ( )
protectedvirtualinherited

Rewind the file position to the beginning of the file.

Note
This is equivalent to seek(0, SEEK_SET)

Reimplemented from FileHandle.

virtual off_t seek ( off_t  offset,
int  whence 
)
protectedvirtualinherited

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

Parameters
offsetThe offset from whence to move to
whenceThe 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 send_nb ( uint8_t *  buffer,
uint32_t  size,
uint32_t *  actual,
bool  now = true 
)
inherited

Send what there is room for.

Parameters
bufferdata to send
sizemaximum number of bytes to send
actuala pointer to where to store the number of bytes sent
nowtrue to start data transmission, false to wait
virtual int set_blocking ( bool  blocking)
virtualinherited

Set blocking or nonblocking mode of the file operation like read/write.

Definition depends on the subclass implementing FileHandle. The default is blocking.

Parameters
blockingtrue for blocking mode, false for nonblocking mode.
Returns
0 on success
Negative error code on failure

Reimplemented in UARTSerial.

Definition at line 209 of file FileHandle.h.

virtual void sigio ( Callback< void()>  func)
virtualinherited

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 is susceptible to change. It should be used as a cue to make read/write/poll calls to find the current state.

Parameters
funcFunction to call on state change

Reimplemented in UARTSerial.

Definition at line 314 of file FileHandle.h.

virtual off_t size ( )
protectedvirtualinherited

Get the size of the file.

Returns
Size of the file in bytes

Reimplemented from FileHandle.

void sof_disable ( )
inherited

Disable the start of frame interrupt.

Stop calling USBDevice::callback_sof.

void sof_enable ( )
inherited

Enable the start of frame interrupt.

Call USBDevice::callback_sof on every frame.

virtual void start_process ( )
protectedvirtualinherited

Callback called to indicate the USB processing needs to be done.

Implements USBPhyEvents.

virtual int sync ( )
protectedvirtualinherited

Flush any buffers associated with the file.

Returns
0 on success, negative error code on failure

Reimplemented from FileHandle.

virtual off_t tell ( )
protectedvirtualinherited

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 from FileHandle.

virtual int truncate ( off_t  length)
virtualinherited

Truncate or extend a file.

The file's length is set to the specified value. The seek pointer is not changed. If the file is extended, the extended area appears as if it were zero-filled.

Parameters
lengthThe requested new length for the file
Returns
Zero on success, negative error code on failure

Reimplemented in File, and TestFile< FILE_SIZE >.

Definition at line 151 of file FileHandle.h.

virtual void unlock ( void  )
protectedvirtualinherited

Release exclusive access to this object.

Definition at line 87 of file Stream.h.

virtual void unlock ( )
protectedvirtualinherited

Release exclusive access to this instance USBDevice.

void wait_ready ( )
inherited

Block until the terminal is connected.

bool writable ( ) const
inherited

Definition depends on the subclass implementing FileHandle.

For example, if the FileHandle is of type Stream, writable() could return true when there is ample buffer space available for write() calls.

Returns
true if the FileHandle is writable.

Definition at line 281 of file FileHandle.h.

virtual ssize_t write ( const void *  buffer,
size_t  size 
)
protectedvirtualinherited

Write the contents of a buffer to a file.

Devices acting as FileHandles should follow POSIX semantics:

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

    Parameters
    bufferThe buffer to write from
    sizeThe number of bytes to write
    Returns
    The number of bytes written, negative error on failure

Implements FileHandle.

uint32_t write_finish ( usb_ep_t  endpoint)
inherited

Get the status of a write.

Parameters
endpointendpoint to get the status of
Returns
number of bytes sent by this endpoint
bool write_start ( usb_ep_t  endpoint,
uint8_t *  buffer,
uint32_t  size 
)
inherited

Write a data to the given endpoint.

Write data to an endpoint. The data sent must remain unchanged until the transfer either completes or is aborted.

Parameters
endpointendpoint to write data to
bufferdata to write
sizethe size of data to send. This must be less than or equal to the max packet size of this endpoint
Note
This endpoint must already have been setup with endpoint_add
int writeable ( )

Determine if there is space available to write a character.

Returns
1 if there is space to write a character, 0 otherwise

Definition at line 136 of file USBSerial.h.

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