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