/****************************************************************************
* px4/sensors/test_gpio.c
*
* Copyright (C) 2012 PX4 Development Team. All rights reserved.
* Lorenz Meier <lm@inf.ethz.ch>
*
* 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 <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <debug.h>
#include <arch/board/board.h>
#include "tests.h"
#include <math.h>
#include <float.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Public Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: test_led
****************************************************************************/
int test_uart_loopback(int argc, char *argv[])
{
int uart5_nread = 0;
int uart2_nread = 0;
int uart5_nwrite = 0;
int uart2_nwrite = 0;
int uart1 = open("/dev/ttyS0", O_RDWR | O_NOCTTY); //
/* assuming NuttShell is on UART1 (/dev/ttyS0) */
int uart2 = open("/dev/ttyS1", O_RDWR | O_NONBLOCK | O_NOCTTY); //
int uart5 = open("/dev/ttyS2", O_RDWR | O_NONBLOCK | O_NOCTTY); //
if (uart2 < 0) {
printf("ERROR opening UART2, aborting..\n");
return uart2;
}
if (uart5 < 0) {
printf("ERROR opening UART5, aborting..\n");
exit(uart5);
}
uint8_t sample_uart1[] = {'C', 'O', 'U', 'N', 'T', ' ', '#', '\n'};
uint8_t sample_uart2[] = {'C', 'O', 'U', 'N', 'T', ' ', '#', 0};
uint8_t sample_uart5[] = {'C', 'O', 'U', 'N', 'T', ' ', '#', 0};
int i, r;
for (i = 0; i < 1000; i++) {
// printf("TEST #%d\n",i);
write(uart1, sample_uart1, sizeof(sample_uart1));
/* uart2 -> uart5 */
r = write(uart2, sample_uart2, sizeof(sample_uart2));
if (r > 0)
uart2_nwrite += r;
// printf("TEST #%d\n",i);
write(uart1, sample_uart1, sizeof(sample_uart1));
/* uart2 -> uart5 */
r = write(uart5, sample_uart5, sizeof(sample_uart5));
if (r > 0)
uart5_nwrite += r;
// printf("TEST #%d\n",i);
write(uart1, sample_uart1, sizeof(sample_uart1));
/* try to read back values */
do {
r = read(uart5, sample_uart2, sizeof(sample_uart2));
if (r > 0)
uart5_nread += r;
} while (r > 0);
// printf("TEST #%d\n",i);
write(uart1, sample_uart1, sizeof(sample_uart1));
do {
r = read(uart2, sample_uart5, sizeof(sample_uart5));
if (r > 0)
uart2_nread += r;
} while (r > 0);
// printf("TEST #%d\n",i);
// write(uart1, sample_uart1, sizeof(sample_uart5));
}
for (i = 0; i < 200000; i++) {
/* try to read back values */
r = read(uart5, sample_uart2, sizeof(sample_uart2));
if (r > 0)
uart5_nread += r;
r = read(uart2, sample_uart5, sizeof(sample_uart5));
if (r > 0)
uart2_nread += r;
if ((uart2_nread == uart2_nwrite) && (uart5_nread == uart5_nwrite))
break;
}
close(uart1);
close(uart2);
close(uart5);
printf("uart2_nwrite %d\n", uart2_nwrite);
printf("uart5_nwrite %d\n", uart5_nwrite);
printf("uart2_nread %d\n", uart2_nread);
printf("uart5_nread %d\n", uart5_nread);
return 0;
}
