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NSH: Add an option to take stdin from a USB keyboard device
This commit is contained in:
Gregory Nutt
337
nshlib/nsh_usbconsole.c
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337
nshlib/nsh_usbconsole.c
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/****************************************************************************
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* apps/nshlib/nsh_usbconsole.c
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*
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* Copyright (C) 2012-2014 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <assert.h>
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#include <debug.h>
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#ifdef CONFIG_CDCACM
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# include <nuttx/usb/cdcacm.h>
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#endif
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#ifdef CONFIG_CDCACM
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# include <nuttx/usb/pl2303.h>
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#endif
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#include "nsh.h"
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#include "nsh_console.h"
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#ifdef HAVE_USB_CONSOLE
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Public Data
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nsh_configstdio
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*
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* Description:
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* Configure standard I/O
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*
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****************************************************************************/
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static void nsh_configstdio(int fd)
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{
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/* Make sure the stdin, stdout, and stderr are closed */
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(void)fclose(stdin);
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(void)fclose(stdout);
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(void)fclose(stderr);
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/* Dup the fd to create standard fd 0-2 */
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(void)dup2(fd, 0);
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(void)dup2(fd, 1);
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(void)dup2(fd, 2);
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/* fdopen to get the stdin, stdout and stderr streams. The following logic depends
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* on the fact that the library layer will allocate FILEs in order. And since
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* we closed stdin, stdout, and stderr above, that is what we should get.
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*
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* fd = 0 is stdin (read-only)
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* fd = 1 is stdout (write-only, append)
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* fd = 2 is stderr (write-only, append)
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*/
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(void)fdopen(0, "r");
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(void)fdopen(1, "a");
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(void)fdopen(2, "a");
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}
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/****************************************************************************
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* Name: nsh_nullstdio
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*
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* Description:
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* Use /dev/null for standard I/O
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*
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****************************************************************************/
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static int nsh_nullstdio(void)
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{
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int fd;
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/* Open /dev/null for read/write access */
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fd = open("/dev/null", O_RDWR);
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if (fd >= 0)
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{
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/* Configure standard I/O to use /dev/null */
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nsh_configstdio(fd);
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/* We can close the original file descriptor now (unless it was one of
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* 0-2)
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*/
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if (fd > 2)
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{
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close(fd);
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}
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return OK;
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}
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return fd;
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}
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/****************************************************************************
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* Name: nsh_waitusbready
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*
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* Description:
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* Wait for the USB console device to be ready
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*
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****************************************************************************/
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static int nsh_waitusbready(void)
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{
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char inch;
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ssize_t nbytes;
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int nlc;
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int fd;
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/* Don't start the NSH console until the console device is ready. Chances
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* are, we get here with no functional console. The USB console will not
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* be available until the device is connected to the host and until the
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* host-side application opens the connection.
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*/
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/* Open the USB serial device for read/write access */
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do
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{
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/* Try to open the console */
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fd = open(CONFIG_NSH_USBCONDEV, O_RDWR);
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if (fd < 0)
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{
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/* ENOTCONN means that the USB device is not yet connected. Anything
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* else is bad.
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*/
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DEBUGASSERT(errno == ENOTCONN);
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/* Sleep a bit and try again */
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sleep(2);
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}
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}
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while (fd < 0);
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/* Now wait until we successfully read a carriage return a few times.
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* That is a sure way of know that there is something at the other end of
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* the USB serial connection that is ready to talk with us. The user needs
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* to hit ENTER a few times to get things started.
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*/
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nlc = 0;
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do
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{
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/* Read one byte */
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inch = 0;
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nbytes = read(fd, &inch, 1);
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/* Is it a carriage return (or maybe a newline)? */
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if (nbytes == 1 && (inch == '\n' || inch == '\r'))
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{
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/* Yes.. increment the count */
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nlc++;
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}
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else
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{
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/* No.. Reset the count. We need to see 3 in a row to continue. */
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nlc = 0;
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}
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}
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while (nlc < 3);
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/* Configure standard I/O */
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nsh_configstdio(fd);
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/* We can close the original file descriptor now (unless it was one of 0-2) */
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if (fd > 2)
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{
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close(fd);
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}
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return OK;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nsh_consolemain (USB console version)
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*
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* Description:
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* This interfaces maybe to called or started with task_start to start a
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* single an NSH instance that operates on stdin and stdout. This
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* function does not return.
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*
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* This function handles generic /dev/console character devices, or
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* special USB console devices. The USB console requires some special
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* operations to handle the cases where the session is lost when the
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* USB device is unplugged and restarted when the USB device is plugged
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* in again.
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*
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* Input Parameters:
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* Standard task start-up arguments. These are not used. argc may be
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* zero and argv may be NULL.
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*
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* Returned Values:
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* This function does not return nor does it ever exit (unless the user
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* executes the NSH exit command).
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*
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****************************************************************************/
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int nsh_consolemain(int argc, char *argv[])
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{
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FAR struct console_stdio_s *pstate = nsh_newconsole();
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int ret;
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DEBUGASSERT(pstate);
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/* Initialize any USB tracing options that were requested */
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#ifdef CONFIG_NSH_USBDEV_TRACE
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usbtrace_enable(TRACE_BITSET);
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#endif
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/* Initialize the USB serial driver */
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#if defined(CONFIG_PL2303) || defined(CONFIG_CDCACM)
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#ifdef CONFIG_CDCACM
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ret = cdcacm_initialize(CONFIG_NSH_USBDEV_MINOR, NULL);
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#else
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ret = usbdev_serialinitialize(CONFIG_NSH_USBDEV_MINOR);
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#endif
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UNUSED(ret); /* Eliminate warning if not used */
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DEBUGASSERT(ret == OK);
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#endif
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/* Configure to use /dev/null if we do not have a valid console. */
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#ifndef CONFIG_DEV_CONSOLE
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(void)nsh_nullstdio();
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#endif
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/* Execute the one-time start-up script (output may go to /dev/null) */
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#ifdef CONFIG_NSH_ROMFSETC
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(void)nsh_initscript(&pstate->cn_vtbl);
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#endif
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/* Now loop, executing creating a session for each USB connection */
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for (;;)
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{
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/* Wait for the USB to be connected to the host and switch
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* standard I/O to the USB serial device.
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*/
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ret = nsh_waitusbready();
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(void)ret; /* Eliminate warning if not used */
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DEBUGASSERT(ret == OK);
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/* Execute the session */
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(void)nsh_session(pstate);
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/* Switch to /dev/null because we probably no longer have a
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* valid console device.
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*/
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(void)nsh_nullstdio();
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}
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}
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#endif /* HAVE_USB_CONSOLE */
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