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Diffstat (limited to 'apps/nshlib/nsh_usbconsole.c')
-rw-r--r-- | apps/nshlib/nsh_usbconsole.c | 337 |
1 files changed, 337 insertions, 0 deletions
diff --git a/apps/nshlib/nsh_usbconsole.c b/apps/nshlib/nsh_usbconsole.c new file mode 100644 index 000000000..800b36413 --- /dev/null +++ b/apps/nshlib/nsh_usbconsole.c @@ -0,0 +1,337 @@ +/**************************************************************************** + * apps/nshlib/nsh_usbconsole.c + * + * Copyright (C) 2012-2014 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" +#include "nsh_console.h" + +#ifdef HAVE_USB_CONSOLE + +/**************************************************************************** + * Pre-processor Definitions + ****************************************************************************/ + + /**************************************************************************** + * Private Types + ****************************************************************************/ + +/**************************************************************************** + * Private Function Prototypes + ****************************************************************************/ + +/**************************************************************************** + * Private Data + ****************************************************************************/ + +/**************************************************************************** + * Public Data + ****************************************************************************/ + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: nsh_configstdio + * + * Description: + * Configure standard I/O + * + ****************************************************************************/ + +static void nsh_configstdio(int fd) +{ + /* 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); + + /* 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"); +} + +/**************************************************************************** + * Name: nsh_nullstdio + * + * Description: + * Use /dev/null for standard I/O + * + ****************************************************************************/ + +static int nsh_nullstdio(void) +{ + int fd; + + /* Open /dev/null for read/write access */ + + fd = open("/dev/null", O_RDWR); + if (fd >= 0) + { + /* Configure standard I/O to use /dev/null */ + + nsh_configstdio(fd); + + /* We can close the original file descriptor now (unless it was one of + * 0-2) + */ + + if (fd > 2) + { + close(fd); + } + + return OK; + } + + return fd; +} + +/**************************************************************************** + * Name: nsh_waitusbready + * + * Description: + * Wait for the USB console device to be ready + * + ****************************************************************************/ + +static int nsh_waitusbready(void) +{ + char inch; + ssize_t nbytes; + int nlc; + int fd; + + /* 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. + */ + + /* 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 wait 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); + + /* Configure standard I/O */ + + nsh_configstdio(fd); + + /* We can close the original file descriptor now (unless it was one of 0-2) */ + + if (fd > 2) + { + close(fd); + } + + return OK; +} + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: nsh_consolemain (USB console version) + * + * Description: + * This interfaces maybe to called or started with task_start to start a + * single an NSH instance that operates on stdin and stdout. This + * function does not return. + * + * This function handles generic /dev/console character devices, or + * special USB console devices. The USB console requires some special + * operations to handle the cases where the session is lost when the + * USB device is unplugged and restarted when the USB device is plugged + * in again. + * + * Input Parameters: + * Standard task start-up arguments. These are not used. argc may be + * zero and argv may be NULL. + * + * Returned Values: + * This function does not return nor does it ever exit (unless the user + * executes the NSH exit command). + * + ****************************************************************************/ + +int nsh_consolemain(int argc, char *argv[]) +{ + FAR struct console_stdio_s *pstate = nsh_newconsole(); + int ret; + + DEBUGASSERT(pstate); + + /* Initialize any USB tracing options that were requested */ + +#ifdef CONFIG_NSH_USBDEV_TRACE + usbtrace_enable(TRACE_BITSET); +#endif + + /* Initialize the USB serial driver */ + +#if defined(CONFIG_PL2303) || defined(CONFIG_CDCACM) +#ifdef CONFIG_CDCACM + ret = cdcacm_initialize(CONFIG_NSH_USBDEV_MINOR, NULL); +#else + ret = usbdev_serialinitialize(CONFIG_NSH_USBDEV_MINOR); +#endif + + UNUSED(ret); /* Eliminate warning if not used */ + DEBUGASSERT(ret == OK); +#endif + + /* Configure to use /dev/null if we do not have a valid console. */ + +#ifndef CONFIG_DEV_CONSOLE + (void)nsh_nullstdio(); +#endif + + /* Execute the one-time start-up script (output may go to /dev/null) */ + +#ifdef CONFIG_NSH_ROMFSETC + (void)nsh_initscript(&pstate->cn_vtbl); +#endif + + /* Now loop, executing creating a session for each USB connection */ + + for (;;) + { + /* Wait for the USB to be connected to the host and switch + * standard I/O to the USB serial device. + */ + + ret = nsh_waitusbready(); + + (void)ret; /* Eliminate warning if not used */ + DEBUGASSERT(ret == OK); + + /* Execute the session */ + + (void)nsh_session(pstate); + + /* Switch to /dev/null because we probably no longer have a + * valid console device. + */ + + (void)nsh_nullstdio(); + } +} + +#endif /* HAVE_USB_CONSOLE */ |