Linux Receiver Operator Version of Signal Generator Example

Robotics & Edge Computing Jetson Systems Jetson Thor
1

linux_signal_generator.txt (16.4 KB)

Hello, I am trying to modify the ROCE based Signal Generator Holoscan example to use Linux sockets (LinuxReceiverOperator).

I’m seeing the following error about not being able to start the Linux Receiver.

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image2239×1281 256 KB

Please see the attached code.

Any help would be appreciated.

-JS

4

I think this might be a step in the correct direction and it seems to work.

To get waveforms displayed increment / decrement + - values.
Mouse-over shows signal values too.
Click Show Time Domain checkbox for print of values in another segment.
After running python linux_signal_generator.py there’s an 11 second warm up delay as noted below.

python linux_signal_generator.py --tx-hololink 192.168.0.2 --rx-hololink 192.168.0.2

python linux_signal_generator_loopback.py  


  Both apps share the same HSB device since Tx and Rx are on the same unit. The pipeline will be:

  SignalGeneratorOp → IQEncoderOp → UdpTransmitterOp
		                                           ↓
                                     HSB FPGA port 4791
                                     (TX FIFO → I2S path → RX data plane)
 		                                          ↓
                           LinuxReceiverOperator → IQDecoderOp → SignalViewerOp


  The 11 register writes with 1-second sleeps (0x70000014, 0x80000000–0x80000010, 0x01200000–0x0120000C) initialize that I2S chain — clock dividers,
  AF/AE FIFO thresholds, enable, pause, and host-pause mapping — before UdpTransmitterOp starts sending data on port 4791. That sequencing is why
  RoceReceiverInitializer.initialize() must complete (and _init_done must fire) before the Tx thread starts.


End-to-end hardware loop working — SignalGeneratorOp → IQEncoderOp → UdpTransmitterOp → HSB FPGA TX → HSB FPGA RX → LinuxReceiverOp 
  → IQDecoderOp → SignalViewerOp — all on a single hololink-sensor-bridge at 192.168.0.2
  
# linux_signal_generator.py is untested on hsb <-> hsb; but should work. I don't have 2 hsb to test.

linux_signal_generator_loopback.py.txt (9.2 KB)
linux_signal_generator.py.txt (16.1 KB)

5

Thank you so much for this! This was really helpful!