mirror of https://github.com/ArduPilot/ardupilot
95 lines
3.5 KiB
C++
95 lines
3.5 KiB
C++
/// -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*-
|
|
/*
|
|
This program is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
/*
|
|
* AP_OpticalFlow_PX4.cpp - ardupilot library for PX4Flow sensor
|
|
*
|
|
*/
|
|
|
|
#include <AP_HAL/AP_HAL.h>
|
|
#include "OpticalFlow.h"
|
|
|
|
#if CONFIG_HAL_BOARD == HAL_BOARD_PX4
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <fcntl.h>
|
|
#include <unistd.h>
|
|
|
|
#include <drivers/drv_px4flow.h>
|
|
#include <uORB/topics/optical_flow.h>
|
|
|
|
extern const AP_HAL::HAL& hal;
|
|
|
|
AP_OpticalFlow_PX4::AP_OpticalFlow_PX4(OpticalFlow &_frontend) :
|
|
OpticalFlow_backend(_frontend)
|
|
{}
|
|
|
|
|
|
void AP_OpticalFlow_PX4::init(void)
|
|
{
|
|
_fd = open(PX4FLOW0_DEVICE_PATH, O_RDONLY);
|
|
|
|
// check for failure to open device
|
|
if (_fd == -1) {
|
|
return;
|
|
}
|
|
|
|
// change to 10Hz update
|
|
if (ioctl(_fd, SENSORIOCSPOLLRATE, 10) != 0) {
|
|
hal.console->printf("Unable to set flow rate to 10Hz\n");
|
|
}
|
|
}
|
|
|
|
// update - read latest values from sensor and fill in x,y and totals.
|
|
void AP_OpticalFlow_PX4::update(void)
|
|
{
|
|
// return immediately if not initialised
|
|
if (_fd == -1) {
|
|
return;
|
|
}
|
|
|
|
struct optical_flow_s report;
|
|
while (::read(_fd, &report, sizeof(optical_flow_s)) == sizeof(optical_flow_s) &&
|
|
report.timestamp != _last_timestamp) {
|
|
struct OpticalFlow::OpticalFlow_state state;
|
|
state.device_id = report.sensor_id;
|
|
state.surface_quality = report.quality;
|
|
if (report.integration_timespan > 0) {
|
|
float yawAngleRad = _yawAngleRad();
|
|
float cosYaw = cosf(yawAngleRad);
|
|
float sinYaw = sinf(yawAngleRad);
|
|
const Vector2f flowScaler = _flowScaler();
|
|
float flowScaleFactorX = 1.0f + 0.001f * flowScaler.x;
|
|
float flowScaleFactorY = 1.0f + 0.001f * flowScaler.y;
|
|
float integralToRate = 1e6f / float(report.integration_timespan);
|
|
// rotate sensor measurements from sensor to body frame through sensor yaw angle
|
|
state.flowRate.x = flowScaleFactorX * integralToRate * (cosYaw * float(report.pixel_flow_x_integral) - sinYaw * float(report.pixel_flow_y_integral)); // rad/sec measured optically about the X body axis
|
|
state.flowRate.y = flowScaleFactorY * integralToRate * (sinYaw * float(report.pixel_flow_x_integral) + cosYaw * float(report.pixel_flow_y_integral)); // rad/sec measured optically about the Y body axis
|
|
state.bodyRate.x = integralToRate * (cosYaw * float(report.gyro_x_rate_integral) - sinYaw * float(report.gyro_y_rate_integral)); // rad/sec measured inertially about the X body axis
|
|
state.bodyRate.y = integralToRate * (sinYaw * float(report.gyro_x_rate_integral) + cosYaw * float(report.gyro_y_rate_integral)); // rad/sec measured inertially about the Y body axis
|
|
} else {
|
|
state.flowRate.zero();
|
|
state.bodyRate.zero();
|
|
}
|
|
_last_timestamp = report.timestamp;
|
|
|
|
_update_frontend(state);
|
|
}
|
|
}
|
|
|
|
#endif // CONFIG_HAL_BOARD == HAL_BOARD_PX4
|