New 8k USB buffer granularity

[shclift]

We have a real-time application using xA4s where RF-to-host latency is critical, but maximum throughput is not. We are using asynchronous mode. To get acceptable latency we size the transfers to get a USB transfer rate of around 10 kHz. With the increased buffer granularity the host will have to deal with an increased data rate, up to 4x faster depending on the bandwidth configuration.

Is there a way with the 2.6.0 release to build the firmware, FPGA code, library etc with the original buffer size? If not, we may have to stay with the old firmware etc and forgo any 2.6.0 improvements.

[rthomp10]

Give branch ryan/build-smaller-buffer-size a try. The FX3 and HDL builds will accept arguments that will revert the buffer size changes and version numbers.

Assets: assets.tar.gz

#HDL
./build_bladerf.sh -L 
#FX3
cmake -DLOW_LATENCY_GPIF_BUFFERS=ON 

[shclift]

Thanks! I'll try it.