If no bursts were received over a long enough duration
then the threshold would roll into negative territory.
The energy detection is based on a comparison with the
squared threshold, so all handsets would become
effectively barred after a certain period of
inactivity.
In theory, this bug also exists in the mainline tree,
but there the daughterboard receive gain is fixed at
max, which always allows the ADC to generate sufficient
noise to trigger the energy dectector and keep the
system in a valid steady state.
To fix, simply add a negative value check like those
already in place for other locations.
Signed-off-by: Thomas Tsou <ttsou@vt.edu>
UHD will internally accept floats with a range of +/-1.0,
which corresponds to a 16-bit signed integer range of
apporximately +/- 32000. Set the default amplitude to .3,
which is a safe value agaist saturation elsewhere in the
transmit chain.
The non-UHD maximum amplitude is unchanged at 13500.
Remove digital gain control because it's unnecessary and
causes extra load on enbedded systems.
Signed-off-by: Thomas Tsou <ttsou@vt.edu>
The output of the modulator or resampler is scaled and
converted from floating point to fixed point. The scaling
factor is the leftover dB in RF attention (relative to max
transmit power), which is handled prior to the integer
conversion. This should work across all daughterboards and
non-UHD installations.
Signed-off-by: Thomas Tsou <ttsou@vt.edu>
Push the ability to set thread priority out to the 52M
Transceiver interface, because that's where the thread
control exists.
Signed-off-by: Thomas Tsou <ttsou@vt.edu>
Thomas Tsou