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/****************************************************************************
*
* Copyright (C) 2012 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 FMU communication for the PX4IO module.
*/
#include <nuttx/config.h>
#include <stdio.h>
#include <stdbool.h>
#include <fcntl.h>
#include <unistd.h>
#include <debug.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <nuttx/clock.h>
#include <drivers/drv_hrt.h>
#include <systemlib/hx_stream.h>
#include <systemlib/perf_counter.h>
#include "px4io.h"
#define FMU_MIN_REPORT_INTERVAL 5000 /* 5ms */
#define FMU_MAX_REPORT_INTERVAL 100000 /* 100ms */
static int fmu_fd;
static hx_stream_t stream;
static struct px4io_report report;
static void comms_handle_frame(void *arg, const void *buffer, size_t length);
void
comms_init(void)
{
fmu_fd = open("/dev/ttyS1", O_RDWR | O_NONBLOCK);
if (fmu_fd < 0)
lib_lowprintf("COMMS: fmu open failed %d\n", errno);
stream = hx_stream_init(fmu_fd, comms_handle_frame, NULL);
report.i2f_magic = I2F_MAGIC;
}
void
comms_check(void)
{
static hrt_abstime last_report_time;
hrt_abstime now, delta;
uint8_t c;
/* should we send a report to the FMU? */
now = hrt_absolute_time();
delta = now - last_report_time;
if ((delta > FMU_MIN_REPORT_INTERVAL) &&
(system_state.fmu_report_due || (delta > FMU_MAX_REPORT_INTERVAL))) {
system_state.fmu_report_due = false;
last_report_time = now;
/* populate the report */
for (int i = 0; i < system_state.rc_channels; i++)
report.rc_channel[i] = system_state.rc_channel_data[i];
report.channel_count = system_state.rc_channels;
report.armed = system_state.armed;
/* and send it */
hx_stream_send(stream, &report, sizeof(report));
}
/* feed any received bytes to the HDLC receive engine */
while (read(fmu_fd, &c, 1) == 1)
hx_stream_rx(stream, c);
}
static void
comms_handle_frame(void *arg, const void *buffer, size_t length)
{
struct px4io_command *cmd;
/* make sure it's what we are expecting */
if (length != sizeof(struct px4io_command))
return;
cmd = (struct px4io_command *)buffer;
/* fetch new PWM output values */
for (unsigned i = 0; i < PX4IO_OUTPUT_CHANNELS; i++)
system_state.fmu_channel_data[i] = cmd->servo_command[i];
system_state.arm_ok = cmd->arm_ok;
system_state.mixer_use_fmu = true;
system_state.fmu_data_received = true;
/* handle changes signalled by FMU */
if (!system_state.arm_ok && system_state.armed)
system_state.armed = false;
/* XXX do relay changes here */
for (unsigned i = 0; i < PX4IO_RELAY_CHANNELS; i++)
system_state.relays[i] = cmd->relay_state[i];
}
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