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/**
* \file
*
* \brief USB CDC Standard I/O Serial Management.
*
* This module defines support routines for a stdio serial interface to the
* Atmel Software Framework (ASF) common USB CDC service.
*
* Copyright (c) 2011-2015 Atmel Corporation. All rights reserved.
*
* \asf_license_start
*
* \page License
*
* 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.
*
* 4. This software may only be redistributed and used in connection with an
* Atmel microcontroller product.
*
* THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
* EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* \asf_license_stop
*
*/
/*
* Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a>
*/
#include "stdio_usb.h"
static bool stdio_usb_interface_enable = false;
int stdio_usb_putchar (volatile void * unused, char data)
{
/* A negative return value should be used to indicate that data
* was not written, but this doesn't seem to work with GCC libc.
*/
if (!stdio_usb_interface_enable) {
return 0; // -1
}
return udi_cdc_putc(data) ? 0 : -1;
}
void stdio_usb_getchar (void volatile * unused, char *data)
{
/* A negative return value should be used to indicate that data
* was not read, but this doesn't seem to work with GCC libc.
*/
if (!stdio_usb_interface_enable) {
*data = 0; // -1
return;
}
*data = (char)udi_cdc_getc();
}
bool stdio_usb_enable(void)
{
stdio_usb_interface_enable = true;
return true;
}
void stdio_usb_disable(void)
{
stdio_usb_interface_enable = false;
}
void stdio_usb_init(void)
{
stdio_base = NULL;
ptr_put = stdio_usb_putchar;
ptr_get = stdio_usb_getchar;
/*
* Start and attach USB CDC device interface for devices with
* integrated USB interfaces. Assume the VBUS is present if
* VBUS monitoring is not available.
*/
udc_start ();
#if defined(__GNUC__)
# if XMEGA
// For AVR GCC libc print redirection uses fdevopen.
fdevopen((int (*)(char, FILE*))(_write),(int (*)(FILE*))(_read));
# endif
# if UC3 || SAM
// For AVR32 and SAM GCC
// Specify that stdout and stdin should not be buffered.
setbuf(stdout, NULL);
setbuf(stdin, NULL);
// Note: Already the case in IAR's Normal DLIB default configuration
// and AVR GCC library:
// - printf() emits one character at a time.
// - getchar() requests only 1 byte to exit.
# endif
#endif
}
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