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/****************************************************************************
*
* Copyright (c) 2012, 2013 PX4 Development Team. All rights reserved.
*
* 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 PX4 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.
*
****************************************************************************/
/**
* @file test_ppm_loopback.c
* Tests the PWM outputs and PPM input
*
*/
#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 <drivers/drv_pwm_output.h>
#include <drivers/drv_rc_input.h>
#include <uORB/topics/rc_channels.h>
#include <systemlib/err.h>
#include "tests.h"
#include <math.h>
#include <float.h>
int test_ppm_loopback(int argc, char *argv[])
{
int _rc_sub = orb_subscribe(ORB_ID(input_rc));
int servo_fd, result;
servo_position_t data[PWM_OUTPUT_MAX_CHANNELS];
servo_position_t pos;
servo_fd = open(PWM_OUTPUT_DEVICE_PATH, O_RDWR);
if (servo_fd < 0) {
printf("failed opening /dev/pwm_servo\n");
}
printf("Servo readback, pairs of values should match defaults\n");
unsigned servo_count;
result = ioctl(servo_fd, PWM_SERVO_GET_COUNT, (unsigned long)&servo_count);
if (result != OK) {
warnx("PWM_SERVO_GET_COUNT");
return ERROR;
}
for (unsigned i = 0; i < servo_count; i++) {
result = ioctl(servo_fd, PWM_SERVO_GET(i), (unsigned long)&pos);
if (result < 0) {
printf("failed reading channel %u\n", i);
}
//printf("%u: %u %u\n", i, pos, data[i]);
}
// /* tell safety that its ok to disable it with the switch */
// result = ioctl(servo_fd, PWM_SERVO_SET_ARM_OK, 0);
// if (result != OK)
// warnx("FAIL: PWM_SERVO_SET_ARM_OK");
// tell output device that the system is armed (it will output values if safety is off)
// result = ioctl(servo_fd, PWM_SERVO_ARM, 0);
// if (result != OK)
// warnx("FAIL: PWM_SERVO_ARM");
int pwm_values[] = {1200, 1300, 1900, 1700, 1500, 1250, 1800, 1400};
// for (unsigned i = 0; (i < servo_count) && (i < sizeof(pwm_values) / sizeof(pwm_values[0])); i++) {
// result = ioctl(servo_fd, PWM_SERVO_SET(i), pwm_values[i]);
// if (result) {
// (void)close(servo_fd);
// return ERROR;
// } else {
// warnx("channel %d set to %d", i, pwm_values[i]);
// }
// }
warnx("servo count: %d", servo_count);
struct pwm_output_values pwm_out = {.values = {0}, .channel_count = 0};
for (unsigned i = 0; (i < servo_count) && (i < sizeof(pwm_values) / sizeof(pwm_values[0])); i++) {
pwm_out.values[i] = pwm_values[i];
//warnx("channel %d: disarmed PWM: %d", i+1, pwm_values[i]);
pwm_out.channel_count++;
}
result = ioctl(servo_fd, PWM_SERVO_SET_DISARMED_PWM, (long unsigned int)&pwm_out);
/* give driver 10 ms to propagate */
/* read low-level values from FMU or IO RC inputs (PPM, Spektrum, S.Bus) */
struct rc_input_values rc_input;
orb_copy(ORB_ID(input_rc), _rc_sub, &rc_input);
usleep(100000);
/* open PPM input and expect values close to the output values */
bool rc_updated;
orb_check(_rc_sub, &rc_updated);
if (rc_updated) {
orb_copy(ORB_ID(input_rc), _rc_sub, &rc_input);
// int ppm_fd = open(RC_INPUT_DEVICE_PATH, O_RDONLY);
// struct rc_input_values rc;
// result = read(ppm_fd, &rc, sizeof(rc));
// if (result != sizeof(rc)) {
// warnx("Error reading RC output");
// (void)close(servo_fd);
// (void)close(ppm_fd);
// return ERROR;
// }
/* go and check values */
for (unsigned i = 0; (i < servo_count) && (i < sizeof(pwm_values) / sizeof(pwm_values[0])); i++) {
if (fabsf(rc_input.values[i] - pwm_values[i]) > 10) {
warnx("comparison fail: RC: %d, expected: %d", rc_input.values[i], pwm_values[i]);
(void)close(servo_fd);
return ERROR;
}
}
} else {
warnx("failed reading RC input data");
return ERROR;
}
warnx("PPM LOOPBACK TEST PASSED SUCCESSFULLY!");
return 0;
}
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