mirror of https://github.com/ArduPilot/ardupilot
222 lines
7.0 KiB
C++
222 lines
7.0 KiB
C++
/*
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <utility>
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#include <AP_HAL/AP_HAL.h>
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#include <AP_Math/AP_Math.h>
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#include <stdio.h>
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#include "AP_Compass_MAG3110.h"
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extern const AP_HAL::HAL &hal;
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/*
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EN:
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at first glance, the magnetometer MAG3110 consists only of flaws:
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* noisy, with a bad characteristic, with very large difference on axes
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* it can't be calibrated in any way, you just have to believe what he has been measured
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* There are no adjustments and settings, it just sends data with some unknown sensitivity. Or does not sends :)
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* One and a half setup registers, in which only the frequency of operation and the number of averagings are specified
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This is a device, wooden to the waist. But of all these shortcomings, its sole and basic virtue arises:
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* He will never comes buggy or clevers.
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And since we do not need much from a magnetometer and it is required to calibrate the Ardupilot itself, the device
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appears in a completely new light - as a reliable info "north is there." What we really need.
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RUS:
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на первый взгляд, магнитометр MAG3110 состоит из одних лишь недостатков:
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* шумный, с кривой характеристикой,
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* никак не калибруется, приходится просто верить тому что он намерял
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* нет никаких регулировок и настроек, он просто выдает данные с некой неизвестной чувствительностью. Или не выдает :)
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* полтора настроечных регистра, в которых задается только частота работы и количество усреднений
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Такой вот девайс, по пояс деревянный. Но из всех этих недостатков проистекает его единственное и основное достоинство:
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* он никогда не глючит и не умничает.
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А так как нам от магнитометра особо много и не требуется, а калибровать Ардупилот и сам умеет, то девайс
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предстает в совсем новом свете - как надежный указатель "север там". Что нам собственно и надо.
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*/
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/*
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the vector length filter can help with noise on the bus, but may
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interfere with higher level processing. It should really be moved
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into the AP_Compass_backend code, with a parameter to enable it.
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*/
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#ifndef MAG3110_ENABLE_LEN_FILTER
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#define MAG3110_ENABLE_LEN_FILTER 0
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#endif
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// Registers
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#define MAG3110_MAG_REG_STATUS 0x00
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#define MAG3110_MAG_REG_HXL 0x01
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#define MAG3110_MAG_REG_HXH 0x02
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#define MAG3110_MAG_REG_HYL 0x03
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#define MAG3110_MAG_REG_HYH 0x04
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#define MAG3110_MAG_REG_HZL 0x05
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#define MAG3110_MAG_REG_HZH 0x06
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#define MAG3110_MAG_REG_WHO_AM_I 0x07
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#define MAG3110_MAG_REG_SYSMODE 0x08
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#define MAG3110_MAG_REG_CTRL_REG1 0x10
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#define MAG3110_MAG_REG_CTRL_REG2 0x11
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#define BIT_STATUS_REG_DATA_READY (1 << 3)
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AP_Compass_MAG3110::AP_Compass_MAG3110(AP_HAL::OwnPtr<AP_HAL::Device> dev)
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: _dev(std::move(dev))
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{
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}
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AP_Compass_Backend *AP_Compass_MAG3110::probe(AP_HAL::OwnPtr<AP_HAL::Device> dev,
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enum Rotation rotation)
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{
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if (!dev) {
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return nullptr;
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}
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AP_Compass_MAG3110 *sensor = new AP_Compass_MAG3110(std::move(dev));
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if (!sensor || !sensor->init(rotation)) {
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delete sensor;
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return nullptr;
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}
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return sensor;
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}
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bool AP_Compass_MAG3110::init(enum Rotation rotation)
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{
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bool success = _hardware_init();
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if (!success) {
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return false;
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}
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_initialised = true;
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// perform an initial read
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read();
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/* register the compass instance in the frontend */
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_dev->set_device_type(DEVTYPE_MAG3110);
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if (!register_compass(_dev->get_bus_id(), _compass_instance)) {
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return false;
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}
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set_dev_id(_compass_instance, _dev->get_bus_id());
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set_rotation(_compass_instance, rotation);
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set_external(_compass_instance, true);
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// read at 75Hz
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_dev->register_periodic_callback(13333, FUNCTOR_BIND_MEMBER(&AP_Compass_MAG3110::_update, void));
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return true;
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}
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bool AP_Compass_MAG3110::_hardware_init()
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{
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AP_HAL::Semaphore *bus_sem = _dev->get_semaphore();
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bus_sem->take_blocking();
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// initially run the bus at low speed
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_dev->set_speed(AP_HAL::Device::SPEED_LOW);
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bool ret=false;
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_dev->set_retries(5);
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uint8_t sig = 0;
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bool ack = _dev->read_registers(MAG3110_MAG_REG_WHO_AM_I, &sig, 1);
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if (!ack || sig != 0xC4) goto exit;
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ack = _dev->write_register(MAG3110_MAG_REG_CTRL_REG1, 0x01); // active mode 80 Hz ODR with OSR = 1
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if (!ack) goto exit;
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hal.scheduler->delay(20);
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ack = _dev->write_register(MAG3110_MAG_REG_CTRL_REG2, 0xA0); // AUTO_MRST_EN + RAW
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if (!ack) goto exit;
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ret = true;
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_dev->set_retries(3);
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printf("MAG3110 found on bus 0x%x\n", (uint16_t)_dev->get_bus_id());
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exit:
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_dev->set_speed(AP_HAL::Device::SPEED_HIGH);
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bus_sem->give();
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return ret;
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}
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// Read Sensor data
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bool AP_Compass_MAG3110::_read_sample()
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{
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{
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uint8_t status;
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bool ack = _dev->read_registers(MAG3110_MAG_REG_STATUS, &status, 1);
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if (!ack || (status & BIT_STATUS_REG_DATA_READY) == 0) {
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return false;
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}
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}
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uint8_t buf[6];
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bool ack = _dev->read_registers(MAG3110_MAG_REG_HXL, buf, 6);
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if (!ack) {
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return false;
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}
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_mag_x = (int16_t)(buf[0] << 8 | buf[1]);
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_mag_y = (int16_t)(buf[2] << 8 | buf[3]);
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_mag_z = (int16_t)(buf[4] << 8 | buf[5]);
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return true;
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}
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#define MAG_SCALE (1.0f/10000 / 0.0001f * 1000) // 1 Tesla full scale of +-10000, 1 Gauss = 0,0001 Tesla, library needs milliGauss
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void AP_Compass_MAG3110::_update()
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{
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if (!_read_sample()) {
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return;
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}
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Vector3f raw_field = Vector3f((float)_mag_x, (float)_mag_y, (float)_mag_z) * MAG_SCALE;
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accumulate_sample(raw_field, _compass_instance);
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}
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// Read Sensor data
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void AP_Compass_MAG3110::read()
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{
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if (!_initialised) {
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return;
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}
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drain_accumulated_samples(_compass_instance);
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}
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