Input data format for limeTRX

Projects LimeSDR
1

I seek confirmation of the data format for sending a test file with limeTRX. Is it interleaved 16 bit I/Q samples as used by gr-limesuiteng plugin?
I tried:
testing$ limeConfig --device=LimeSDR-USB --initialize -
-rxen=0 --txen=1 --samplerate=5e6 --txlo=800e6 --txlpf=50e6 --txpath=“Band1”

testing$ limeTRX --device=LimeSDR-USB --input=‘/testNGsource/ramp_10s.bin’

where the input file was generated with the flowgraph below. A tone at the LO frequency is generated as from a d.c. input but the waveform that I would see from the same file fed to the LimeSuiteNG sink block is not evident

make_baseband_data
make_baseband_data1176×480 57.4 KB

in the signal sent from the limeTRX CLI utility.

2

Currently limeTRX reads/writes raw memory, so it’s CPU architecture dependent. Most commonly it’s 16bit little endian integers. It writes to file only the first Rx channel, and transmits from file over all Tx channels.
I think GNU Radio File sink stores data in 16bit big endian integers.

3

You have the “File sink” output set to write “short int”, but you can set it to write what ever type you please.