ardupilot/libraries/AP_Compass/AP_Compass_QMC5883L.cpp

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/*
* Copyright (C) 2016 Emlid Ltd. All rights reserved.
*
* This file 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 file 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/>.
*
* Driver by RadioLink LjWang, Jun 2017
* GPS compass module See<http://www.radiolink.com>
*/
#include "AP_Compass_QMC5883L.h"
#if AP_COMPASS_QMC5883L_ENABLED
#include <stdio.h>
#include <utility>
#include <AP_HAL/AP_HAL.h>
#include <AP_HAL/utility/sparse-endian.h>
#include <AP_Math/AP_Math.h>
#define QMC5883L_REG_CONF1 0x09
#define QMC5883L_REG_CONF2 0x0A
// data output rates for 5883L
#define QMC5883L_ODR_10HZ (0x00 << 2)
#define QMC5883L_ODR_50HZ (0x01 << 2)
#define QMC5883L_ODR_100HZ (0x02 << 2)
#define QMC5883L_ODR_200HZ (0x03 << 2)
// Sensor operation modes
#define QMC5883L_MODE_STANDBY 0x00
#define QMC5883L_MODE_CONTINUOUS 0x01
#define QMC5883L_RNG_2G (0x00 << 4)
#define QMC5883L_RNG_8G (0x01 << 4)
#define QMC5883L_OSR_512 (0x00 << 6)
#define QMC5883L_OSR_256 (0x01 << 6)
#define QMC5883L_OSR_128 (0x10 << 6)
#define QMC5883L_OSR_64 (0x11 << 6)
#define QMC5883L_RST 0x80
#define QMC5883L_REG_DATA_OUTPUT_X 0x00
#define QMC5883L_REG_STATUS 0x06
#define QMC5883L_REG_ID 0x0D
#define QMC5883_ID_VAL 0xFF
extern const AP_HAL::HAL &hal;
AP_Compass_Backend *AP_Compass_QMC5883L::probe(AP_HAL::OwnPtr<AP_HAL::I2CDevice> dev,
bool force_external,
enum Rotation rotation)
{
if (!dev) {
return nullptr;
}
AP_Compass_QMC5883L *sensor = new AP_Compass_QMC5883L(std::move(dev),force_external,rotation);
if (!sensor || !sensor->init()) {
delete sensor;
return nullptr;
}
return sensor;
}
AP_Compass_QMC5883L::AP_Compass_QMC5883L(AP_HAL::OwnPtr<AP_HAL::Device> dev,
bool force_external,
enum Rotation rotation)
: _dev(std::move(dev))
, _rotation(rotation)
, _force_external(force_external)
{
}
bool AP_Compass_QMC5883L::init()
{
_dev->get_semaphore()->take_blocking();
_dev->set_retries(10);
#if 0
_dump_registers();
#endif
if(!_check_whoami()){
goto fail;
}
if (!_dev->write_register(0x0B, 0x01)||
!_dev->write_register(0x20, 0x40)||
!_dev->write_register(0x21, 0x01)||
!_dev->write_register(QMC5883L_REG_CONF1,
QMC5883L_MODE_CONTINUOUS|
QMC5883L_ODR_100HZ|
QMC5883L_OSR_512|
QMC5883L_RNG_8G)) {
goto fail;
}
// lower retries for run
_dev->set_retries(3);
_dev->get_semaphore()->give();
//register compass instance
_dev->set_device_type(DEVTYPE_QMC5883L);
if (!register_compass(_dev->get_bus_id(), _instance)) {
return false;
}
set_dev_id(_instance, _dev->get_bus_id());
printf("%s found on bus %u id %u address 0x%02x\n", name,
_dev->bus_num(), _dev->get_bus_id(), _dev->get_bus_address());
set_rotation(_instance, _rotation);
if (_force_external) {
set_external(_instance, true);
}
//Enable 100HZ
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_dev->register_periodic_callback(10000,
FUNCTOR_BIND_MEMBER(&AP_Compass_QMC5883L::timer, void));
return true;
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fail:
_dev->get_semaphore()->give();
return false;
}
bool AP_Compass_QMC5883L::_check_whoami()
{
uint8_t whoami;
//Affected by other devices,must read registers 0x00 once or reset,after can read the ID registers reliably
_dev->read_registers(0x00,&whoami,1);
if (!_dev->read_registers(0x0C, &whoami,1)||
whoami != 0x01){
return false;
}
if (!_dev->read_registers(QMC5883L_REG_ID, &whoami,1)||
whoami != QMC5883_ID_VAL){
return false;
}
return true;
}
void AP_Compass_QMC5883L::timer()
{
struct PACKED {
le16_t rx;
le16_t ry;
le16_t rz;
} buffer;
const float range_scale = 1000.0f / 3000.0f;
uint8_t status;
if(!_dev->read_registers(QMC5883L_REG_STATUS,&status,1)){
return;
}
//new data is ready
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if (!(status & 0x04)) {
return;
}
if(!_dev->read_registers(QMC5883L_REG_DATA_OUTPUT_X, (uint8_t *) &buffer, sizeof(buffer))){
return ;
}
auto x = -static_cast<int16_t>(le16toh(buffer.rx));
auto y = static_cast<int16_t>(le16toh(buffer.ry));
auto z = -static_cast<int16_t>(le16toh(buffer.rz));
#if 0
printf("mag.x:%d\n",x);
printf("mag.y:%d\n",y);
printf("mag.z:%d\n",z);
#endif
Vector3f field = Vector3f{x * range_scale , y * range_scale, z * range_scale };
// rotate to the desired orientation
if (is_external(_instance)) {
field.rotate(ROTATION_YAW_90);
}
accumulate_sample(field, _instance, 20);
}
void AP_Compass_QMC5883L::read()
{
drain_accumulated_samples(_instance);
}
void AP_Compass_QMC5883L::_dump_registers()
{
printf("QMC5883L registers dump\n");
for (uint8_t reg = QMC5883L_REG_DATA_OUTPUT_X; reg <= 0x30; reg++) {
uint8_t v;
_dev->read_registers(reg,&v,1);
printf("%02x:%02x ", (unsigned)reg, (unsigned)v);
if ((reg - ( QMC5883L_REG_DATA_OUTPUT_X-1)) % 16 == 0) {
printf("\n");
}
}
}
#endif // AP_COMPASS_QMC5883L_ENABLED