File content as of revision 78:caf0014375cb:

#pragma once 

#include "SerialPipe.h"

SerialPipe::SerialPipe(PinName tx, PinName rx, int rxSize, int txSize) : 
            _SerialPipeBase(tx,rx), 
            _pipeRx( (rx!=NC) ? rxSize : 0), 
            _pipeTx( (tx!=NC) ? txSize : 0)
{
    if (rx!=NC)
        attach(this, &SerialPipe::rxIrqBuf, RxIrq);
}

SerialPipe::~SerialPipe(void)
{
    attach(NULL, RxIrq);
    attach(NULL, TxIrq);
}

// tx channel
int SerialPipe::writeable(void)    
{
    return _pipeTx.free();
}

int SerialPipe::putc(int c)    
{
    c = _pipeTx.putc(c);
    txStart();
    return c;
}

int SerialPipe::put(const void* buffer, int length, bool blocking)    
{ 
    int count = length;
    const char* ptr = (const char*)buffer;
    if (count)
    {
        do
        {
            int written = _pipeTx.put(ptr, count, false);
            if (written) {
                ptr += written;
                count -= written;
                txStart();
            }
            else if (!blocking)
                break;
            RELAX_MS(0);
        }
        while (count);
    }
    return (length - count);
}

void SerialPipe::txCopy(void)
{
    while (_SerialPipeBase::writeable() && _pipeTx.readable())
    {
        char c = _pipeTx.getc();
        _SerialPipeBase::_base_putc(c);
    }
}

void SerialPipe::txIrqBuf(void)
{
    txCopy();
    // detach tx isr if we are done 
    if (!_pipeTx.readable())
        attach(NULL, TxIrq);
}

void SerialPipe::txStart(void)
{
    // disable the tx isr to avoid interruption
    attach(NULL, TxIrq);
    txCopy();
    // attach the tx isr to handle the remaining data
    if (_pipeTx.readable())
        attach(this, &SerialPipe::txIrqBuf, TxIrq);
}

// rx channel
int SerialPipe::readable(void)                      
{ 
    return _pipeRx.readable(); 
} 

int SerialPipe::getc(void)                          
{ 
    if (!_pipeRx.readable())
        return EOF;
    return _pipeRx.getc(); 
} 

int SerialPipe::get(void* buffer, int length, bool blocking) 
{ 
    return _pipeRx.get((char*)buffer,length,blocking); 
}

void SerialPipe::rxIrqBuf(void)
{
    while (_SerialPipeBase::readable())
    {
        char c = _SerialPipeBase::_base_getc();
        if (_pipeRx.writeable())
            _pipeRx.putc(c);
        else 
            /* overflow */;
    }
}