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>
Add gain and attenuation settings that were present
only in the 52MHz transceiver. This patch also
fixes SETRXGAIN failed warnings at startup.
Signed-off-by: Thomas Tsou <ttsou@vt.edu>
The underrun behaviour of the USRP2 is different from the USRP1, and
the adaptive latency mechanism is not directly transferable. Instead,
fix the latency with a higher starting value, which effectively
buffers more samples on the host in front of the Ethernet interface.
An alternative may be to use the adaptive approach with USRP2
specific upper and lower bounds. For now, just use preprocessor
directives until a better solution comes around.
Signed-off-by: Thomas Tsou <ttsou@vt.edu>
Thomas Tsou