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flowc_sender.c
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flowc_sender.c
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/****************************************************************************
* apps/examples/flowc/flowc_sender.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include "config.h"
#include <stdint.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <fcntl.h>
#include <termios.h>
#include <string.h>
#include <errno.h>
#include "flowc.h"
/****************************************************************************
* Public Data
****************************************************************************/
static char g_tty_devname[MAX_DEVNAME] =
CONFIG_EXAMPLES_FLOWC_SENDER_DEVNAME;
/****************************************************************************
* Private Functions
****************************************************************************/
static inline void fill_buffer(FAR uint8_t *buf)
{
FAR uint8_t *ptr;
int ch;
for (ch = 0x20; ch < 0x7f; ch++)
{
*ptr++ = ch;
}
}
/****************************************************************************
* flowc_cmdline
****************************************************************************/
static int flowc_cmdline(int argc, char **argv)
{
/* Currently only a single command line option is supported: The receiver
* IP address.
*/
if (argc == 2)
{
strncpy(g_tty_devname, argv[1], MAX_DEVNAME);
}
else if (argc != 1)
{
fprintf(stderr, "ERROR: Too many arguments\n");
fprintf(stderr, "USAGE: %s [<tty-devname>]\n", argv[0]);
return 1;
}
return 0;
}
/****************************************************************************
* Public Functions
****************************************************************************/
int flowc_sender(int argc, char **argv)
{
uint8_t outbuf[SENDSIZE];
#ifdef CONFIG_EXAMPLES_FLOWC_OUTPUT
struct termios term;
#endif
ssize_t nsent;
int ret;
int fd;
int i;
/* Parse the command line */
ret = flowc_cmdline(argc, argv);
if (ret != 0)
{
return ret;
}
/* Open the serial device */
fd = open(g_tty_devname, O_WRONLY);
if (fd < 0)
{
printf("sender ERROR: Failed to open %s: %d\n", g_tty_devname, errno);
return 1;
}
#ifdef CONFIG_EXAMPLES_FLOWC_OUTPUT
/* Set output flow control */
tcgetattr(fd, &term);
#ifdef CCTS_OFLOW
term.c_cflag |= CCTS_OFLOW;
#else
term.c_cflag |= CRTSCTS;
#endif
tcsetattr(fd, TCSANOW, &term);
#endif
/* Set up the output buffer */
fill_buffer(outbuf);
/* Then send the buffer multiple times as fast as possible */
for (i = 0; i < NSENDS; i++)
{
/* Send the message */
nsent = write(fd, outbuf, SENDSIZE);
if (nsent < 0)
{
printf("sender: %lu. write failed: %d\n",
(unsigned long)i*SENDSIZE, errno);
close(fd);
return 1;
}
else if (nsent != SENDSIZE)
{
printf("sender: %lu. Bad send length: %ld Expected: %d\n",
(unsigned long)i*SENDSIZE, (long)nsent, SENDSIZE);
close(fd);
return 1;
}
}
close(fd);
return 0;
}