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Diffstat (limited to 'apps/nshlib/nsh_usbdev.c')
| -rw-r--r-- | apps/nshlib/nsh_usbdev.c | 243 |
1 files changed, 243 insertions, 0 deletions
diff --git a/apps/nshlib/nsh_usbdev.c b/apps/nshlib/nsh_usbdev.c new file mode 100644 index 000000000..3d123532a --- /dev/null +++ b/apps/nshlib/nsh_usbdev.c @@ -0,0 +1,243 @@ +/**************************************************************************** + * 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 */ |