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ardupilot/libraries/AP_ExternalAHRS/AP_ExternalAHRS_MicroStrain...

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/*
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/>.
*/
/*
support for MicroStrain CX5/GX5-45 serially connected AHRS Systems
*/
#define ALLOW_DOUBLE_MATH_FUNCTIONS
#include "AP_ExternalAHRS_config.h"
#if AP_EXTERNAL_AHRS_MICROSTRAIN5_ENABLED
#include "AP_ExternalAHRS_MicroStrain5.h"
#include "AP_Compass/AP_Compass_config.h"
#include <AP_Baro/AP_Baro.h>
#include <AP_Compass/AP_Compass.h>
#include <AP_GPS/AP_GPS.h>
#include <AP_HAL/utility/sparse-endian.h>
#include <AP_InertialSensor/AP_InertialSensor.h>
#include <GCS_MAVLink/GCS.h>
#include <AP_Logger/AP_Logger.h>
#include <AP_BoardConfig/AP_BoardConfig.h>
#include <AP_SerialManager/AP_SerialManager.h>
extern const AP_HAL::HAL &hal;
static constexpr uint8_t gnss_instance = 0;
AP_ExternalAHRS_MicroStrain5::AP_ExternalAHRS_MicroStrain5(AP_ExternalAHRS *_frontend,
AP_ExternalAHRS::state_t &_state): AP_ExternalAHRS_backend(_frontend, _state)
{
auto &sm = AP::serialmanager();
uart = sm.find_serial(AP_SerialManager::SerialProtocol_AHRS, 0);
baudrate = sm.find_baudrate(AP_SerialManager::SerialProtocol_AHRS, 0);
port_num = sm.find_portnum(AP_SerialManager::SerialProtocol_AHRS, 0);
if (!uart) {
GCS_SEND_TEXT(MAV_SEVERITY_ERROR, "MicroStrain5 ExternalAHRS no UART");
return;
}
if (!hal.scheduler->thread_create(FUNCTOR_BIND_MEMBER(&AP_ExternalAHRS_MicroStrain5::update_thread, void), "AHRS", 2048, AP_HAL::Scheduler::PRIORITY_SPI, 0)) {
AP_BoardConfig::allocation_error("MicroStrain5 failed to allocate ExternalAHRS update thread");
}
hal.scheduler->delay(5000);
GCS_SEND_TEXT(MAV_SEVERITY_INFO, "MicroStrain5 ExternalAHRS initialised");
}
void AP_ExternalAHRS_MicroStrain5::update_thread(void)
{
if (!port_open) {
port_open = true;
uart->begin(baudrate);
}
while (true) {
build_packet();
hal.scheduler->delay_microseconds(100);
}
}
// Builds packets by looking at each individual byte, once a full packet has been read in it checks the checksum then handles the packet.
void AP_ExternalAHRS_MicroStrain5::build_packet()
{
if (uart == nullptr) {
return;
}
WITH_SEMAPHORE(sem);
uint32_t nbytes = MIN(uart->available(), 2048u);
while (nbytes--> 0) {
uint8_t b;
if (!uart->read(b)) {
break;
}
DescriptorSet descriptor;
if (handle_byte(b, descriptor)) {
switch (descriptor) {
case DescriptorSet::IMUData:
post_imu();
break;
case DescriptorSet::GNSSData:
case DescriptorSet::GNSSRecv1:
case DescriptorSet::GNSSRecv2:
break;
case DescriptorSet::FilterData:
post_filter();
break;
case DescriptorSet::BaseCommand:
case DescriptorSet::DMCommand:
case DescriptorSet::SystemCommand:
break;
}
}
}
}
// Posts data from an imu packet to `state` and `handle_external` methods
void AP_ExternalAHRS_MicroStrain5::post_imu() const
{
{
WITH_SEMAPHORE(state.sem);
state.accel = imu_data.accel;
state.gyro = imu_data.gyro;
state.quat = imu_data.quat;
state.have_quaternion = true;
}
{
AP_ExternalAHRS::ins_data_message_t ins {
accel: imu_data.accel,
gyro: imu_data.gyro,
temperature: -300
};
AP::ins().handle_external(ins);
}
#if AP_COMPASS_EXTERNALAHRS_ENABLED
{
AP_ExternalAHRS::mag_data_message_t mag {
field: imu_data.mag
};
AP::compass().handle_external(mag);
}
#endif
#if AP_BARO_EXTERNALAHRS_ENABLED
{
const AP_ExternalAHRS::baro_data_message_t baro {
instance: 0,
pressure_pa: imu_data.pressure,
// setting temp to 25 effectively disables barometer temperature calibrations - these are already performed by MicroStrain
temperature: 25,
};
AP::baro().handle_external(baro);
}
#endif
}
void AP_ExternalAHRS_MicroStrain5::post_filter() const
{
{
WITH_SEMAPHORE(state.sem);
state.velocity = Vector3f{filter_data.ned_velocity_north, filter_data.ned_velocity_east, filter_data.ned_velocity_down};
state.have_velocity = true;
state.location = Location{filter_data.lat, filter_data.lon, gnss_data[gnss_instance].msl_altitude, Location::AltFrame::ABSOLUTE};
state.have_location = true;
state.last_location_update_us = AP_HAL::micros();
}
AP_ExternalAHRS::gps_data_message_t gps {
gps_week: filter_data.week,
ms_tow: filter_data.tow_ms,
fix_type: AP_GPS_FixType(gnss_data[gnss_instance].fix_type),
satellites_in_view: gnss_data[gnss_instance].satellites,
horizontal_pos_accuracy: gnss_data[gnss_instance].horizontal_position_accuracy,
vertical_pos_accuracy: gnss_data[gnss_instance].vertical_position_accuracy,
horizontal_vel_accuracy: gnss_data[gnss_instance].speed_accuracy,
hdop: gnss_data[gnss_instance].hdop,
vdop: gnss_data[gnss_instance].vdop,
longitude: filter_data.lon,
latitude: filter_data.lat,
msl_altitude: gnss_data[gnss_instance].msl_altitude,
ned_vel_north: filter_data.ned_velocity_north,
ned_vel_east: filter_data.ned_velocity_east,
ned_vel_down: filter_data.ned_velocity_down,
};
if (gps.fix_type >= AP_GPS_FixType::FIX_3D && !state.have_origin) {
WITH_SEMAPHORE(state.sem);
state.origin = Location{int32_t(filter_data.lat),
int32_t(filter_data.lon),
int32_t(gnss_data[gnss_instance].msl_altitude),
Location::AltFrame::ABSOLUTE};
state.have_origin = true;
}
uint8_t gps_instance;
if (AP::gps().get_first_external_instance(gps_instance)) {
AP::gps().handle_external(gps, gps_instance);
}
}
int8_t AP_ExternalAHRS_MicroStrain5::get_port(void) const
{
if (!uart) {
return -1;
}
return port_num;
};
// Get model/type name
const char* AP_ExternalAHRS_MicroStrain5::get_name() const
{
return "MicroStrain5";
}
bool AP_ExternalAHRS_MicroStrain5::healthy(void) const
{
uint32_t now = AP_HAL::millis();
return (now - last_imu_pkt < 40 && now - last_gps_pkt < 500 && now - last_filter_pkt < 500);
}
bool AP_ExternalAHRS_MicroStrain5::initialised(void) const
{
return last_imu_pkt != 0 && last_gps_pkt != 0 && last_filter_pkt != 0;
}
bool AP_ExternalAHRS_MicroStrain5::pre_arm_check(char *failure_msg, uint8_t failure_msg_len) const
{
if (!healthy()) {
hal.util->snprintf(failure_msg, failure_msg_len, "MicroStrain5 unhealthy");
return false;
}
if (gnss_data[gnss_instance].fix_type < 3) {
hal.util->snprintf(failure_msg, failure_msg_len, "MicroStrain5 no GPS lock");
return false;
}
if (filter_status.state != 0x02) {
hal.util->snprintf(failure_msg, failure_msg_len, "MicroStrain5 filter not running");
return false;
}
return true;
}
void AP_ExternalAHRS_MicroStrain5::get_filter_status(nav_filter_status &status) const
{
memset(&status, 0, sizeof(status));
if (last_imu_pkt != 0 && last_gps_pkt != 0) {
status.flags.initalized = true;
}
if (healthy() && last_imu_pkt != 0) {
status.flags.attitude = true;
status.flags.vert_vel = true;
status.flags.vert_pos = true;
if (gnss_data[gnss_instance].fix_type >= 3) {
status.flags.horiz_vel = true;
status.flags.horiz_pos_rel = true;
status.flags.horiz_pos_abs = true;
status.flags.pred_horiz_pos_rel = true;
status.flags.pred_horiz_pos_abs = true;
status.flags.using_gps = true;
}
}
}
// get variances
bool AP_ExternalAHRS_MicroStrain5::get_variances(float &velVar, float &posVar, float &hgtVar, Vector3f &magVar, float &tasVar) const
{
velVar = gnss_data[gnss_instance].speed_accuracy * vel_gate_scale;
posVar = gnss_data[gnss_instance].horizontal_position_accuracy * pos_gate_scale;
hgtVar = gnss_data[gnss_instance].vertical_position_accuracy * hgt_gate_scale;
tasVar = 0;
return true;
}
#endif // AP_EXTERNAL_AHRS_MICROSTRAIN5_ENABLED
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