px4-firmware/apps/nshlib/nsh_usbdev.c

244 lines
7.3 KiB
C

/****************************************************************************
* apps/nshlib/nsh_usbdev.c
*
* Copyright (C) 2012 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* 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. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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 DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <assert.h>
#include <debug.h>
#ifdef CONFIG_CDCACM
# include <nuttx/usb/cdcacm.h>
#endif
#ifdef CONFIG_CDCACM
# include <nuttx/usb/pl2303.h>
#endif
#include "nsh.h"
#ifdef CONFIG_USBDEV
/****************************************************************************
* Definitions
****************************************************************************/
#if defined(CONFIG_DEBUG) || defined(CONFIG_NSH_USBCONSOLE)
# define trmessage lib_lowprintf
#else
# define trmessage printf
#endif
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Public Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: nsh_tracecallback
****************************************************************************/
#ifdef CONFIG_USBDEV_TRACE
static int nsh_tracecallback(struct usbtrace_s *trace, void *arg)
{
usbtrace_trprintf((trprintf_t)trmessage, trace->event, trace->value);
return 0;
}
#endif
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: nsh_usbconsole
****************************************************************************/
#ifdef HAVE_USB_CONSOLE
int nsh_usbconsole(void)
{
char inch;
ssize_t nbytes;
int nlc;
int fd;
int ret;
/* Initialize any USB tracing options that were requested */
#ifdef CONFIG_USBDEV_TRACE
usbtrace_enable(TRACE_BITSET);
#endif
/* Don't start the NSH console until the console device is ready. Chances
* are, we get here with no functional console. The USB console will not
* be available until the device is connected to the host and until the
* host-side application opens the connection.
*/
/* Initialize the USB serial driver */
#if defined(CONFIG_PL2303) || defined(CONFIG_CDCACM)
#ifdef CONFIG_CDCACM
ret = cdcacm_initialize(CONFIG_NSH_UBSDEV_MINOR, NULL);
#else
ret = usbdev_serialinitialize(CONFIG_NSH_UBSDEV_MINOR);
#endif
DEBUGASSERT(ret == OK);
#endif
/* Open the USB serial device for read/write access */
do
{
/* Try to open the console */
fd = open(CONFIG_NSH_USBCONDEV, O_RDWR);
if (fd < 0)
{
/* ENOTCONN means that the USB device is not yet connected. Anything
* else is bad.
*/
DEBUGASSERT(errno == ENOTCONN);
/* Sleep a bit and try again */
sleep(2);
}
}
while (fd < 0);
/* Now waiting until we successfully read a carriage return a few times.
* That is a sure way of know that there is something at the other end of
* the USB serial connection that is ready to talk with us. The user needs
* to hit ENTER a few times to get things started.
*/
nlc = 0;
do
{
/* Read one byte */
inch = 0;
nbytes = read(fd, &inch, 1);
/* Is it a carriage return (or maybe a newline)? */
if (nbytes == 1 && (inch == '\n' || inch == '\r'))
{
/* Yes.. increment the count */
nlc++;
}
else
{
/* No.. Reset the count. We need to see 3 in a row to continue. */
nlc = 0;
}
}
while (nlc < 3);
/* Make sure the stdin, stdout, and stderr are closed */
(void)fclose(stdin);
(void)fclose(stdout);
(void)fclose(stderr);
/* Dup the fd to create standard fd 0-2 */
(void)dup2(fd, 0);
(void)dup2(fd, 1);
(void)dup2(fd, 2);
/* We can close the original file descriptor now (unless it was one of 0-2) */
if (fd > 2)
{
close(fd);
}
/* fdopen to get the stdin, stdout and stderr streams. The following logic depends
* on the fact that the library layer will allocate FILEs in order. And since
* we closed stdin, stdout, and stderr above, that is what we should get.
*
* fd = 0 is stdin (read-only)
* fd = 1 is stdout (write-only, append)
* fd = 2 is stderr (write-only, append)
*/
(void)fdopen(0, "r");
(void)fdopen(1, "a");
(void)fdopen(2, "a");
return OK;
}
#endif /* HAVE_USB_CONSOLE */
/****************************************************************************
* Name: nsh_usbtrace
****************************************************************************/
#if defined(CONFIG_USBDEV_TRACE) && defined(HAVE_USB_CONSOLE)
void nsh_usbtrace(void)
{
(void)usbtrace_enumerate(nsh_tracecallback, NULL);
}
#endif
#endif /* CONFIG_USBDEV */