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AP_GyroFFT: correct ref_energy indexing that could lead to free memory read 

Fix doc spelling mistakes
This commit is contained in:
Andy Piper 2022-10-03 07:49:55 +01:00 committed by Randy Mackay
parent 826d7bf984
commit 6fc232af92
1 changed files with 9 additions and 9 deletions
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18
libraries/AP_GyroFFT/AP_GyroFFT.cpp
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@ -575,7 +575,7 @@ bool AP_GyroFFT::pre_arm_check(char *failure_msg, const uint8_t failure_msg_len)
return false;
}
// make sure the frequency maxium is below Nyquist
// make sure the frequency maximum is below Nyquist
if (_fft_max_hz > _fft_sampling_rate_hz * 0.5f) {
hal.util->snprintf(failure_msg, failure_msg_len, "FFT config MAXHZ %dHz > %dHz", _fft_max_hz.get(), _fft_sampling_rate_hz / 2);
return false;
@ -868,7 +868,7 @@ float AP_GyroFFT::calculate_weighted_freq_hz(const Vector3f& energy, const Vecto
// @Description: FFT Filter Tuning
// @Field: TimeUS: microseconds since system startup
// @Field: PkAvg: peak noise frequency as an energy-weighted average of roll and pitch peak frequencies
// @Field: BwAvg: bandwidth of weighted peak freqency where edges are determined by FFT_ATT_REF
// @Field: BwAvg: bandwidth of weighted peak frequency where edges are determined by FFT_ATT_REF
// @Field: SnX: signal-to-noise ratio on the roll axis
// @Field: SnY: signal-to-noise ratio on the pitch axis
// @Field: SnZ: signal-to-noise ratio on the yaw axis
@ -917,7 +917,7 @@ void AP_GyroFFT::write_log_messages()
gcs().send_text(MAV_SEVERITY_WARNING, "FFT: f:%.1f, fr:%.1f, b:%u, fd:%.1f",
_debug_state._center_freq_hz_filtered[FrequencyPeak::CENTER][_update_axis], _debug_state._center_freq_hz[_update_axis], _debug_max_bin, _debug_max_bin_freq);
gcs().send_text(MAV_SEVERITY_WARNING, "FFT: bw:%.1f, e:%.1f, r:%.1f, snr:%.1f",
_debug_state._center_bandwidth_hz_filtered[FrequencyPeak::CENTER][_update_axis], _debug_max_freq_bin, _ref_energy[_update_axis][_debug_max_bin], _debug_snr);
_debug_state._center_bandwidth_hz_filtered[FrequencyPeak::CENTER][_update_axis], _debug_max_freq_bin, _ref_energy[_debug_max_bin][_update_axis], _debug_snr);
_last_output_ms = now;
}
#endif
@ -930,9 +930,9 @@ void AP_GyroFFT::write_log_messages()
// @Field: PkX: noise frequency of the peak on roll
// @Field: PkY: noise frequency of the peak on pitch
// @Field: PkZ: noise frequency of the peak on yaw
// @Field: BwX: bandwidth of the peak freqency on roll where edges are determined by FFT_ATT_REF
// @Field: BwY: bandwidth of the peak freqency on pitch where edges are determined by FFT_ATT_REF
// @Field: BwZ: bandwidth of the peak freqency on yaw where edges are determined by FFT_ATT_REF
// @Field: BwX: bandwidth of the peak frequency on roll where edges are determined by FFT_ATT_REF
// @Field: BwY: bandwidth of the peak frequency on pitch where edges are determined by FFT_ATT_REF
// @Field: BwZ: bandwidth of the peak frequency on yaw where edges are determined by FFT_ATT_REF
// @Field: EnX: power spectral density bin energy of the peak on roll
// @Field: EnY: power spectral density bin energy of the peak on roll
// @Field: EnZ: power spectral density bin energy of the peak on roll
@ -1166,7 +1166,7 @@ bool AP_GyroFFT::get_weighted_frequency(FrequencyPeak peak, float& weighted_peak
// calculate the SNR and center frequency energy
const float max_energy = MAX(1.0f, _state->get_freq_bin(bin));
const float ref_energy = MAX(1.0f, _ref_energy[_update_axis][bin]);
const float ref_energy = MAX(1.0f, _ref_energy[bin][_update_axis]);
snr = 10.f * (log10f(max_energy) - log10f(ref_energy));
// if the bin energy is above the noise threshold then we have a signal
@ -1226,13 +1226,13 @@ void AP_GyroFFT::update_ref_energy(uint16_t max_bin)
// determine a PS noise reference at each of the possible center frequencies
if (_noise_cycles == 0 && _noise_calibration_cycles[_update_axis] > 0) {
for (uint16_t i = 1; i < _state->_bin_count; i++) {
_ref_energy[_update_axis][i] += _state->get_freq_bin(i);
_ref_energy[i][_update_axis] += _state->get_freq_bin(i);
}
if (--_noise_calibration_cycles[_update_axis] == 0) {
for (uint16_t i = 1; i < _state->_bin_count; i++) {
const float cycles = (static_cast<float>(_window_size) / static_cast<float>(_samples_per_frame)) * 2;
// overall random noise is reduced by sqrt(N) when averaging periodigrams so adjust for that
_ref_energy[_update_axis][i] = (_ref_energy[_update_axis][i] / cycles) * sqrtf(cycles);
_ref_energy[i][_update_axis] = (_ref_energy[i][_update_axis] / cycles) * sqrtf(cycles);
}
WITH_SEMAPHORE(_sem);