[Discuss-gnuradio] UHD driver/firmware stability

[Elvis Dowson]

Hi Josh,

                   Is the UHD driver/firmware stable? Or are the current versions still under development? 

Test case 01: Incorrect sample rate value (e.g. 100k) raises an exception, subsequent attempts with correct values do not get a response from the USRP2.

Regarding the previous crash when passing incorrect sample rate values, I tried to replicate the crash again, with 100k sample rate setting, and it terminates. 

terminate called after throwing an instance of 'std::runtime_error'

  what():  No devices found for ----->

addr: 192.168.10.2

However, after you set it back to a valid value of say 100M, it still doesn't work, requiring a full reboot of the USRP2. 

Perhaps this was because of an unhandled exception?

Test case 02: Setting the correct sample rate (e.g. 25M) works once, after that it doesn't work. 

Attempt #1 - 25M sample rate setting

Generating: "/home/elvis/Desktop/grc-examples/top_block.py"

Executing: "/home/elvis/Desktop/grc-examples/top_block.py"

Current recv sock buff size: 50000000 bytes

Current send sock buff size: 50000000 bytes

Using: WBX TX (0x0053)

Using: WBX RX (0x0052)

RX samples per packet: 362

TX samples per packet: 363

Recv pirate num frames: 33967

gr_block_executor: source <gr_block uhd simple source (1)> produced no output.  We're marking it DONE.

>>> Done

Attempt # 2 - 25M sample rate setting

Generating: "/home/elvis/Desktop/grc-examples/top_block.py"

Executing: "/home/elvis/Desktop/grc-examples/top_block.py"

terminate called after throwing an instance of 'std::runtime_error'

  what():  No devices found for ----->

addr: 192.168.10.2

Test case 03: Setting the maximum USRP2 sample rate (100M) doesnt work, it switches to 25Msps.

Generating: "/home/elvis/Desktop/grc-examples/top_block.py"

Executing: "/home/elvis/Desktop/grc-examples/top_block.py"

Current recv sock buff size: 50000000 bytes

Current send sock buff size: 50000000 bytes

Using: WBX TX (0x0053)

Using: WBX RX (0x0052)

RX samples per packet: 362

TX samples per packet: 363

Recv pirate num frames: 33967

The hardware does not support the requested sample rate:

    Target sample rate: 100.000000 MSps

    Actual sample rate: 25.000000 MSps

gr_block_executor: source <gr_block uhd simple source (1)> produced no output.  We're marking it DONE.

Best regards,

Elvis Dowson