add filtered second and third harmonics and log them
make sure we use all of the gyro samples available on each axis rather than skipping
separate gyro update from fft start to minimize time in fast loop
add FFT_HMNC_PEAK to allow users to select which noise peak and which axis will be tracked.
make sure the self-test runs once and display the results
report self-test failure reason. make sure self-test runs for all windows.
always give logging a chance to run at IO_PRIORITY
add log message documentation
make sure the engine still runs even when the arming check has been disabled
record last FFT update time and cycle time and fallback to throttle estimate when update is too old
delay for longer in FFT thread between cycles to cope on F4
try really hard to get a viable frequency estimate
change range on MAXHZ/MINHZ to reflect that 50Hz is actually quite dangerous
swap the center peak for one of the shoulders if there is temporarily a closer match with the frequency trend
when FFT is disabled still log harmonic notch frequency
use distance matrix to find most appropriate peak
use a median filter to remove outliers before filtering
discount peaks that are relatively too low in energy
make sure harmonic fit is tracked for both potential targets
convert all gyro buffers to ObjectBuffer<float> for lock-free access
run all FFT steps inside the FFT thread
calculate cycle time and loop delay correctly
drop samples when the ring buffer is full
add dynamic gyro windows
control inclusion based on HAL_WITH_DSP and GYROFFT_ENABLED
target appropriate ARM cpus
constrain window sizes to be achievable
improve FFT signal accuracy through configurable window overlap and quinn's estimator
calculate energy weighted center frequency
add support for learning hover frequency and throttle reference
calculate power spectrum rather than amplitude
record noise as a per-bin power spectrum
calculate true SNR per-bin and use that to determine there is a signal
add user config for SNR signal level
constrain frequency scanning to MAXHZ
calculate and learn the peak bandwidth at the configured attenuation
allow enabling/disabling dynamically through rc function
MAXHZ should be below Nyquist
Incorporate full range of MAXHZ to MINHZ
update FFT analysis in a separate thread
allocate memory in a specific region
constrain window size by CPU class
do not allocate any resources when not enabled
Prevent self-check and analysis interfering with each other
put configuration and initialization to AP_Vehicle
add logging
fix significant issues with threading, locking and sample buffer access
use both calculated noise peaks together with the harmonic notch configuration to detemine which peak represents the fundamental harmonic that should be tracked
record harmonic fit
add CMSIS 5 libraries and headers
allow larger FFT lengths on Linux and SITL
Andy Piper