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//==========================================================================

//

//      usb_serial_echo.c

//

//      Example application for the USB serial layer in eCos.

//

//==========================================================================

// ####ECOSGPLCOPYRIGHTBEGIN####                                            

// -------------------------------------------                              

// This file is part of eCos, the Embedded Configurable Operating System.   

// Copyright (C) 2008, 2010 Free Software Foundation, Inc.                        

//

// eCos is free software; you can redistribute it and/or modify it under    

// the terms of the GNU General Public License as published by the Free     

// Software Foundation; either version 2 or (at your option) any later      

// version.                                                                 

//

// eCos is distributed in the hope that it will be useful, but WITHOUT      

// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or    

// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License    

// for more details.                                                        

//

// You should have received a copy of the GNU General Public License        

// along with eCos; if not, write to the Free Software Foundation, Inc.,    

// 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.            

//

// As a special exception, if other files instantiate templates or use      

// macros or inline functions from this file, or you compile this file      

// and link it with other works to produce a work based on this file,       

// this file does not by itself cause the resulting work to be covered by   

// the GNU General Public License. However the source code for this file    

// must still be made available in accordance with section (3) of the GNU   

// General Public License v2.                                               

//

// This exception does not invalidate any other reasons why a work based    

// on this file might be covered by the GNU General Public License.         

// -------------------------------------------                              

// ####ECOSGPLCOPYRIGHTEND####                                              

//===========================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):    Frank M. Pagliughi (fmp), SoRo Systems, Inc.

// Contributors: 

// Date:         2008-06-02

// Description:  USB serial example application.

//

//####DESCRIPTIONEND####

//===========================================================================

#include <cyg/kernel/kapi.h>

#include <cyg/hal/hal_arch.h>

#include <cyg/infra/diag.h>

#include <pkgconf/kernel.h>

#include <cyg/io/usb/usbs_serial.h>

#include <stdio.h>

#include <stdlib.h>

#define DEBUG_OUTPUT

#if defined(DEBUG_OUTPUT)

#define DBG diag_printf

#else

#define DBG (1) ? (void)0 : diag_printf

#endif

typedef unsigned char byte;

// --------------------------------------------------------------------------

//                                                         Data & Callback(s)

// --------------------------------------------------------------------------

#define BUF_SIZE        4096

static byte     rx_buf[2][BUF_SIZE+1], tx_buf[BUF_SIZE+1];

// --------------------------------------------------------------------------

//                                                              Main Routine

// --------------------------------------------------------------------------

int main(void)

{

  int             n;

  unsigned        ibuf, next_buf;

  // ----- Start USB subsystem -----

  usbs_serial_start();

  // ----- Get data from host and send it back -----

  while (1) {

    ibuf = 0;

    // ----- Wait for the host to configure -----

    usbs_serial_wait_until_configured();

    cyg_thread_delay((cyg_tick_count_t) 10);

    // ----- While configured read data & print to screen -----

    usbs_serial_start_rx(&usbs_ser0, rx_buf[ibuf], BUF_SIZE);

    while (usbs_serial_is_configured()) {

      n = usbs_serial_wait_for_rx(&usbs_ser0);

      next_buf = ibuf ^ 1;

      usbs_serial_start_rx(&usbs_ser0, rx_buf[next_buf], BUF_SIZE);

      if (n < 0) {

        DBG("*** I/O Error: %d ***\n", n);

      }

      else {

        memcpy(tx_buf, rx_buf[ibuf], n);

        usbs_serial_tx(&usbs_ser0, tx_buf, n);

        rx_buf[ibuf][n] = '\0';

        DBG("%s", rx_buf[ibuf]);

      }

      ibuf = next_buf;

    }

  }

  return 0;

}