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/****************************************************************************
*
* Copyright (c) 2014, 2015 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.
*
****************************************************************************/
/**
* @author Pavel Kirienko <pavel.kirienko@gmail.com>
*/
#include "mag.hpp"
#include <systemlib/err.h>
const char *const UavcanMagnetometerBridge::NAME = "mag";
UavcanMagnetometerBridge::UavcanMagnetometerBridge(uavcan::INode& node) :
UavcanCDevSensorBridgeBase("uavcan_mag", "/dev/uavcan/mag", MAG_DEVICE_PATH, ORB_ID(sensor_mag)),
_sub_mag(node)
{
_device_id.devid_s.devtype = DRV_MAG_DEVTYPE_HMC5883;
_scale.x_scale = 1.0F;
_scale.y_scale = 1.0F;
_scale.z_scale = 1.0F;
}
int UavcanMagnetometerBridge::init()
{
int res = device::CDev::init();
if (res < 0) {
return res;
}
res = _sub_mag.start(MagCbBinder(this, &UavcanMagnetometerBridge::mag_sub_cb));
if (res < 0) {
log("failed to start uavcan sub: %d", res);
return res;
}
return 0;
}
ssize_t UavcanMagnetometerBridge::read(struct file *filp, char *buffer, size_t buflen)
{
static uint64_t last_read = 0;
struct mag_report *mag_buf = reinterpret_cast<struct mag_report *>(buffer);
/* buffer must be large enough */
unsigned count = buflen / sizeof(struct mag_report);
if (count < 1) {
return -ENOSPC;
}
if (last_read < _report.timestamp) {
/* copy report */
lock();
*mag_buf = _report;
last_read = _report.timestamp;
unlock();
return sizeof(struct mag_report);
} else {
/* no new data available, warn caller */
return -EAGAIN;
}
}
int UavcanMagnetometerBridge::ioctl(struct file *filp, int cmd, unsigned long arg)
{
switch (cmd) {
case SENSORIOCSQUEUEDEPTH: {
return OK; // Pretend that this stuff is supported to keep APM happy
}
case MAGIOCSSCALE: {
std::memcpy(&_scale, reinterpret_cast<const void*>(arg), sizeof(_scale));
return 0;
}
case MAGIOCGSCALE: {
std::memcpy(reinterpret_cast<void*>(arg), &_scale, sizeof(_scale));
return 0;
}
case MAGIOCSELFTEST: {
return 0; // Nothing to do
}
case MAGIOCGEXTERNAL: {
return 1; // declare it external rise it's priority and to allow for correct orientation compensation
}
case MAGIOCSSAMPLERATE: {
return 0; // Pretend that this stuff is supported to keep the sensor app happy
}
case MAGIOCCALIBRATE:
case MAGIOCGSAMPLERATE:
case MAGIOCSRANGE:
case MAGIOCGRANGE:
case MAGIOCSLOWPASS:
case MAGIOCEXSTRAP:
case MAGIOCGLOWPASS: {
return -EINVAL;
}
default: {
return CDev::ioctl(filp, cmd, arg);
}
}
}
void UavcanMagnetometerBridge::mag_sub_cb(const uavcan::ReceivedDataStructure<uavcan::equipment::ahrs::Magnetometer> &msg)
{
lock();
_report.range_ga = 1.3F; // Arbitrary number, doesn't really mean anything
_report.timestamp = msg.getMonotonicTimestamp().toUSec();
_report.x = (msg.magnetic_field[0] - _scale.x_offset) * _scale.x_scale;
_report.y = (msg.magnetic_field[1] - _scale.y_offset) * _scale.y_scale;
_report.z = (msg.magnetic_field[2] - _scale.z_offset) * _scale.z_scale;
unlock();
publish(msg.getSrcNodeID().get(), &_report);
}
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