uart_usb_lib.c

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/* Copyright (c) 2007, Atmel Corporation All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * 3. The name of ATMEL may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY ATMEL ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE EXPRESSLY AND
 * SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT,
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/*_____ I N C L U D E S ____________________________________________________*/

#include "config.h"
#include "lib_mcu/usb/usb_drv.h"
#include "usb_descriptors.h"

#include "uart_usb_lib.h"

/*_____ M A C R O S ________________________________________________________*/

/*_____ D E F I N I T I O N ________________________________________________*/


Uchar rx_counter;

/*_____ D E C L A R A T I O N ______________________________________________*/

void uart_usb_init(void)
{
  rx_counter = 0;
}

bit uart_usb_test_hit(void)
{
  if(!Is_device_enumerated())
     return FALSE;

  if (!rx_counter)
  {
    Usb_select_endpoint(RX_EP);
    if (Is_usb_receive_out())
    {
      rx_counter = Usb_byte_counter();
      if (!rx_counter)
      {
        Usb_ack_receive_out();
      }
    }
  }
  return (rx_counter!=0);
}

char uart_usb_getchar(void)
{
  register Uchar data_rx;

  Usb_select_endpoint(RX_EP);
  if (!rx_counter) while (!uart_usb_test_hit());
  data_rx=Usb_read_byte();
  rx_counter--;
  if (!rx_counter) Usb_ack_receive_out();
  return data_rx;
}


bit uart_usb_tx_ready(void)
{
  if(!Is_device_enumerated())
     return FALSE;

  if (!Is_usb_write_enabled())
  {
    return FALSE;
  }
  return TRUE;
}

int uart_usb_putchar(int data_to_send)
{
   uart_usb_send_buffer((U8*)&data_to_send, 1);
   return data_to_send;
}



void uart_usb_send_buffer(U8 *buffer, U8 nb_data)
{
   U8 zlp;

  if(!Is_device_enumerated())
     return;
   
   // Compute if zlp required
   if(nb_data%TX_EP_SIZE) 
   { zlp=FALSE;} 
   else { zlp=TRUE; }
   
   Usb_select_endpoint(TX_EP);
   while (nb_data)
   {
      while(Is_usb_write_enabled()==FALSE); // Wait Endpoint ready
      while(Is_usb_write_enabled() && nb_data)
      {
         Usb_write_byte(*buffer);
         buffer++;
         nb_data--;
      }
      Usb_ack_in_ready();
   }
   if(zlp)
   {
      while(Is_usb_write_enabled()==FALSE); // Wait Endpoint ready
      Usb_ack_in_ready();
   }
}

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