forked from Archive/PX4-Autopilot
137 lines
4.1 KiB
C
137 lines
4.1 KiB
C
/****************************************************************************
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*
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* Copyright (C) 2012 PX4 Development Team. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name PX4 nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/**
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* @file FMU communication for the PX4IO module.
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*/
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#include <nuttx/config.h>
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#include <stdio.h>
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#include <stdbool.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <debug.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <string.h>
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#include <nuttx/clock.h>
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#include <arch/board/up_hrt.h>
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#include <systemlib/hx_stream.h>
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#include <systemlib/perf_counter.h>
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#include "px4io.h"
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#define FMU_MIN_REPORT_INTERVAL 5000 /* 5ms */
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#define FMU_MAX_REPORT_INTERVAL 100000 /* 100ms */
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static int fmu_fd;
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static hx_stream_t stream;
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static struct px4io_report report;
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static void comms_handle_frame(void *arg, const void *buffer, size_t length);
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void
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comms_init(void)
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{
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fmu_fd = open("/dev/ttyS1", O_RDWR | O_NONBLOCK);
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if (fmu_fd < 0)
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lib_lowprintf("COMMS: fmu open failed %d\n", errno);
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stream = hx_stream_init(fmu_fd, comms_handle_frame, NULL);
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report.i2f_magic = I2F_MAGIC;
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}
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void
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comms_check(void)
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{
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static hrt_abstime last_report_time;
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hrt_abstime now, delta;
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uint8_t c;
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/* should we send a report to the FMU? */
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now = hrt_absolute_time();
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delta = now - last_report_time;
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if ((delta > FMU_MIN_REPORT_INTERVAL) &&
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(system_state.fmu_report_due || (delta > FMU_MAX_REPORT_INTERVAL))) {
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system_state.fmu_report_due = false;
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last_report_time = now;
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/* populate the report */
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for (unsigned i = 0; i < system_state.rc_channels; i++)
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report.rc_channel[i] = system_state.rc_channel_data[i];
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report.channel_count = system_state.rc_channels;
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report.armed = system_state.armed;
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/* and send it */
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hx_stream_send(stream, &report, sizeof(report));
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}
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/* feed any received bytes to the HDLC receive engine */
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while (read(fmu_fd, &c, 1) == 1)
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hx_stream_rx(stream, c);
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}
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static void
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comms_handle_frame(void *arg, const void *buffer, size_t length)
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{
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struct px4io_command *cmd;
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/* make sure it's what we are expecting */
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if (length != sizeof(struct px4io_command))
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return;
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cmd = (struct px4io_command *)buffer;
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/* fetch new PWM output values */
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for (unsigned i = 0; i < PX4IO_OUTPUT_CHANNELS; i++)
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system_state.fmu_channel_data[i] = cmd->servo_command[i];
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system_state.arm_ok = cmd->arm_ok;
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system_state.mixer_use_fmu = true;
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system_state.fmu_data_received = true;
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/* handle changes signalled by FMU */
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if (!system_state.arm_ok && system_state.armed)
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system_state.armed = false;
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/* XXX do relay changes here */
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for (unsigned i = 0; i < PX4IO_RELAY_CHANNELS; i++)
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system_state.relays[i] = cmd->relay_state[i];
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}
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