ebefecd9ac
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@1017 42af7a65-404d-4744-a932-0658087f49c3
250 lines
8.4 KiB
C
250 lines
8.4 KiB
C
/****************************************************************************
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* examples/usbserial/main.c
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*
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* Copyright (C) 2008 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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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 <sys/types.h>
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#include <sys/stat.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/usbdev.h>
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/****************************************************************************
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* Definitions
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****************************************************************************/
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#ifdef CONFIG_CPP_HAVE_VARARGS
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# ifdef CONFIG_DEBUG
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# define message(...) lib_lowprintf(__VA_ARGS__)
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# else
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# define message(...) printf(__VA_ARGS__)
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# endif
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#else
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# ifdef CONFIG_DEBUG
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# define message lib_lowprintf
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# else
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# define message printf
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# endif
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#endif
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#define IOBUFFER_SIZE 256
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static const char g_shortmsg[] = "Hello, World!!\n";
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static const char g_longmsg[] =
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"The Spanish Armada a Speech by Queen Elizabeth I of England\n"
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"Addressed to the English army at Tilbury Fort - 1588\n"
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"My loving people, we have been persuaded by some, that are careful of our "
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"safety, to take heed how we commit ourselves to armed multitudes, for fear "
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"of treachery; but I assure you, I do not desire to live to distrust my "
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"faithful and loving people.\n"
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"Let tyrants fear; I have always so behaved myself that, under God, I have "
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"placed my chiefest strength and safeguard in the loyal hearts and good will "
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"of my subjects. And therefore I am come amongst you at this time, not as for "
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"my recreation or sport, but being resolved, in the midst and heat of the "
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"battle, to live or die amongst you all; to lay down, for my God, and for "
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"my kingdom, and for my people, my honour and my blood, even the dust.\n"
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"I know I have but the body of a weak and feeble woman; but I have the heart "
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"of a king, and of a king of England, too; and think foul scorn that Parma "
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"or Spain, or any prince of Europe, should dare to invade the borders of my "
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"realms: to which, rather than any dishonour should grow by me, I myself will "
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"take up arms; I myself will be your general, judge, and rewarder of every "
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"one of your virtues in the field.\n"
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"I know already, by your forwardness, that you have deserved rewards and "
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"crowns; and we do assure you, on the word of a prince, they shall be duly "
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"paid you. In the mean my lieutenant general shall be in my stead, than whom "
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"never prince commanded a more noble and worthy subject; not doubting by "
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"your obedience to my general, by your concord in the camp, and by your "
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"valour in the field, we shall shortly have a famous victory over the enemies "
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"of my God, of my kingdom, and of my people.\n";
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static char g_iobuffer[IOBUFFER_SIZE];
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* user_initialize
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****************************************************************************/
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#ifndef CONFIG_HAVE_WEAKFUNCTIONS
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void user_initialize(void)
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{
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/* Stub that must be provided only if the toolchain does not support weak
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* functions.
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*/
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}
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#endif
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/****************************************************************************
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* user_start
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****************************************************************************/
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int user_start(int argc, char *argv[])
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{
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int infd;
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int outfd;
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int count;
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ssize_t nbytes;
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int ret;
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int i;
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/* Initialize the USB serial driver */
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message("user_start: Registering USB serial driver\n");
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ret = usbdev_serialinitialize(0);
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if (ret < 0)
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{
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message("user_start: ERROR: Failed to create the USB serial device: %d\n", -ret);
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return 1;
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}
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message("user_start: Successfully registered the serial driver\n");
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/* Open the USB serial device for writing (blocking) */
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do
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{
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message("user_start: Opening USB serial driver\n");
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outfd = open("/dev/ttyUSB0", O_WRONLY);
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if (outfd < 0)
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{
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int errcode = errno;
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message("user_start: ERROR: Failed to open /dev/ttyUSB0 for writing: %d\n", errcode);
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/* ENOTCONN means that the USB device is not yet connected */
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if (errcode == ENOTCONN)
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{
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message("user_start: Not connected. Wait and try again.\n");
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sleep(5);
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}
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else
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{
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/* Give up on other errors */
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message("user_start: Aborting\n");
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return 2;
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}
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}
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}
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while (outfd < 0);
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/* Open the USB serial device for reading (non-blocking) */
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infd = open("/dev/ttyUSB0", O_RDONLY|O_NONBLOCK);
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if (infd < 0)
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{
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message("user_start: ERROR: Failed to open /dev/ttyUSB0 for reading: %d\n", errno);
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close(outfd);
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return 3;
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}
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message("user_start: Successfully opened the serial driver\n");
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/* Then say hello -- forever */
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count = 0;
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for (;;)
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{
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if (count < 8)
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{
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message("user_start: Saying hello\n");
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nbytes = write(outfd, g_shortmsg, sizeof(g_shortmsg));
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count++;
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}
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else
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{
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message("user_start: Reciting QEI's speech of 1588\n");
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nbytes = write(outfd, g_longmsg, sizeof(g_longmsg));
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count = 0;
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}
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if (nbytes < 0)
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{
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message("user_start: ERROR: write failed: %d\n", errno);
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close(infd);
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close(outfd);
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return 4;
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}
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/* Poll for incoming messages */
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message("user_start: Waiting\n");
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for (i = 0; i < 5; i++)
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{
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nbytes = read(infd, g_iobuffer, IOBUFFER_SIZE);
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if (nbytes < 0)
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{
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int errorcode = errno;
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if (errorcode != EAGAIN)
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{
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message("user_start: ERROR: read failed: %d\n", errno);
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close(infd);
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close(outfd);
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return 6;
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}
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}
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else
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{
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message("user_start: Received %d bytes:\n", nbytes);
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if (nbytes > 0)
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{
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message("user_start: ");
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(void)fwrite(g_iobuffer, 1, nbytes, stdout);
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}
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}
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sleep(1);
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}
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}
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/* Won't get here, but if we did this what we would have to do */
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close(infd);
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close(outfd);
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return 0;
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}
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