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AP_Compass: publish raw and unfiltered field for HMC5843 compass

This commit is contained in:
Siddharth Bharat Purohit 2015-07-30 21:59:38 -07:00 committed by Andrew Tridgell
parent 8cdc9748b3
commit cdd8bae6ac
2 changed files with 46 additions and 30 deletions
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74
libraries/AP_Compass/AP_Compass_HMC5843.cpp
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@ -178,37 +178,53 @@ void AP_Compass_HMC5843::accumulate(void)
// have the right orientation!) // have the right orientation!)
return; return;
} }
uint32_t tnow = hal.scheduler->micros();
if (_accum_count != 0 && (tnow - _last_accum_time) < 13333) {
// the compass gets new data at 75Hz
return;
}
if (!_bus_sem->take(1)) { uint32_t tnow = hal.scheduler->micros();
// the bus is busy - try again later if (_accum_count != 0 && (tnow - _last_accum_time) < 13333) {
return; // the compass gets new data at 75Hz
} return;
bool result = read_raw(); }
_bus_sem->give();
if (result) { if (!_bus_sem->take(1)) {
// the _mag_N values are in the range -2048 to 2047, so we can // the bus is busy - try again later
// accumulate up to 15 of them in an int16_t. Let's make it 14 return;
// for ease of calculation. We expect to do reads at 10Hz, and }
// we get new data at most 75Hz, so we don't expect to bool result = read_raw();
// accumulate more than 8 before a read _bus_sem->give();
_mag_x_accum += _mag_x;
_mag_y_accum += _mag_y; if (result) {
_mag_z_accum += _mag_z; // the _mag_N values are in the range -2048 to 2047, so we can
_accum_count++; // accumulate up to 15 of them in an int16_t. Let's make it 14
if (_accum_count == 14) { // for ease of calculation. We expect to do reads at 10Hz, and
_mag_x_accum /= 2; // we get new data at most 75Hz, so we don't expect to
_mag_y_accum /= 2; // accumulate more than 8 before a read
_mag_z_accum /= 2; // get raw_field - sensor frame, uncorrected
_accum_count = 7; Vector3f raw_field = Vector3f(_mag_x, _mag_y, _mag_z);
}
_last_accum_time = tnow; // rotate raw_field from sensor frame to body frame
} rotate_field(raw_field, _compass_instance);
// publish raw_field (uncorrected point sample) for calibration use
publish_raw_field(raw_field, tnow, _compass_instance);
// correct raw_field for known errors
correct_field(raw_field, _compass_instance);
// publish raw_field (corrected point sample) for EKF use
publish_unfiltered_field(raw_field, tnow, _compass_instance);
_mag_x_accum += _mag_x;
_mag_y_accum += _mag_y;
_mag_z_accum += _mag_z;
_accum_count++;
if (_accum_count == 14) {
_mag_x_accum /= 2;
_mag_y_accum /= 2;
_mag_z_accum /= 2;
_accum_count = 7;
}
_last_accum_time = tnow;
}
} }

2
modules/PX4NuttX

@ -1 +1 @@
Subproject commit d447403a17ff7433ba99d65c5ce60324f5791ce2 Subproject commit 7c5ef883fc3307b44bef9d5f7b51cb144cdf400a