File content as of revision 1:4b33ffe61bfa:

/* IOSerialStream.h */
/*
Copyright (C) 2012 ARM Limited.

Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
of the Software, and to permit persons to whom the Software is furnished to do
so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/

#ifndef IOSERIALSTREAM_H_
#define IOSERIALSTREAM_H_

#include "core/fwk.h"

#include "Serial.h"

#include "rtos.h"
#include "core/MtxCircBuffer.h"

/** Input Serial Stream for physical serial interfaces (UART...)
This class is not thread-safe, except for the *Abort() methods that can be called by any thread/ISR
*/
#define CIRCBUF_SIZE 255
class IOSerialStream : public IOStream
{
public:
  IOSerialStream(mbed::Serial& serial);
  /*virtual*/ ~IOSerialStream();

  //0 for non-blocking (returns immediately), osWaitForever for infinite blocking
  virtual int read(uint8_t* buf, size_t* pLength, size_t maxLength, uint32_t timeout=osWaitForever);
  virtual size_t available();
  virtual int waitAvailable(uint32_t timeout=osWaitForever); //Wait for data to be available
  virtual int abortRead(); //Abort current reading (or waiting) operation


  //0 for non-blocking (returns immediately), osWaitForever for infinite blocking
  virtual int write(uint8_t* buf, size_t length, uint32_t timeout=osWaitForever);
  virtual size_t space();
  virtual int waitSpace(uint32_t timeout=osWaitForever); //Wait for space to be available
  virtual int abortWrite(); //Abort current writing (or waiting) operation

private:

  mbed::Serial& m_serial;
  volatile bool m_serialTxFifoEmpty;

  void setupReadableISR(bool en);
  void readable(); //Callback from m_serial when new data is available

  Semaphore m_availableSphre; //Used for signalling

  void setupWriteableISR(bool en);
  void writeable(); //Callback from m_serial when new space is available

  Semaphore m_spaceSphre; //Used for signalling

  MtxCircBuffer<uint8_t, CIRCBUF_SIZE + 1> m_inBuf;
  MtxCircBuffer<uint8_t, CIRCBUF_SIZE + 1> m_outBuf;

};

#endif /* IOSERIALSTREAM_H_ */