ardupilot/Tools/AntennaTracker/sensors.pde

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// -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*-
static void init_barometer(void)
{
gcs_send_text_P(SEVERITY_LOW, PSTR("Calibrating barometer"));
barometer.calibrate();
gcs_send_text_P(SEVERITY_LOW, PSTR("barometer calibration complete"));
}
// read the barometer and return the updated altitude in meters
static void update_barometer(void)
{
barometer.read();
}
/*
update INS and attitude
*/
static void update_ahrs()
{
ahrs.update();
}
/*
read and update compass
*/
static void update_compass(void)
{
if (g.compass_enabled && compass.read()) {
ahrs.set_compass(&compass);
compass.learn_offsets();
} else {
ahrs.set_compass(NULL);
}
}
/*
if the compass is enabled then try to accumulate a reading
*/
static void compass_accumulate(void)
{
if (g.compass_enabled) {
compass.accumulate();
}
}
/*
try to accumulate a baro reading
*/
static void barometer_accumulate(void)
{
barometer.accumulate();
}
/*
read the GPS
*/
static void update_GPS(void)
{
gps.update();
static uint32_t last_gps_msg_ms;
static uint8_t ground_start_count = 5;
if (gps.last_message_time_ms() != last_gps_msg_ms &&
gps.status() >= AP_GPS::GPS_OK_FIX_3D) {
last_gps_msg_ms = gps.last_message_time_ms();
if(ground_start_count > 1) {
ground_start_count--;
} else if (ground_start_count == 1) {
// We countdown N number of good GPS fixes
// so that the altitude is more accurate
// -------------------------------------
if (current_loc.lat == 0) {
ground_start_count = 5;
} else {
// Now have an initial GPS position
// use it as the HOME position in future startups
current_loc = gps.location();
set_home(current_loc);
// set system clock for log timestamps
hal.util->set_system_clock(gps.time_epoch_usec());
if (g.compass_enabled) {
// Set compass declination automatically
compass.set_initial_location(gps.location().lat, gps.location().lng);
}
ground_start_count = 0;
}
}
}
}