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[Discuss-gnuradio] FPE with FM Rcvr

From: Ron Hall
Subject: [Discuss-gnuradio] FPE with FM Rcvr
Date: Thu, 31 Mar 2011 04:31:17 +0000

Working the following issue...any ideas?

System: Ubuntu 10.10, Gnuradio 3.3.0, uhd (Mar 2011), USRP2, TVRX

Using the attached grc model results in a floating point exception:

gnuradio_core_runtime.py (1476)
   top_block.py (96)
     top_block_gui.py (72)
       USRP2_WX.py (326)

General output in GRC:

Generating: "/home/jim/radiostuff/refs/gen/USRP2_WX.py"

Executing: "/home/jim/radiostuff/refs/gen/USRP2_WX.py"

linux; GNU C++ version 4.4.5; Boost_104200; UHD_003.000.000-3235792

Current recv frame size: 1476 bytes
Current send frame size: 1472 bytes
Making transport for DSP0...
Current recv sock buff size: 50000000 bytes
Making transport for DSP1...
Current recv sock buff size: 50000000 bytes
Making transport for ERR0...
mboard0 MIMO master

    The hardware does not support the requested RX sample rate:
    Target sample rate: 3.200000 MSps   
    Actual sample rate: 3.225806 MSps   #Betting this is the culprit but haven't completed a trace
>>> gr_fir_ccc: using SSE

>>> Done

I'm looking through the UHD spec to see if there is a function that easily resolves this but nothing has jumped out, yet.

It might be a memory issue. An attempt to sample at the 6Mz limit with the TVRX (board responds with ~5.88...) results in gr_buffer:allocate_buffer: failed to allocate buffer of size 18760, which points to an installation issue that make check should have handled...a reinstall and closer scrutiny of the output should highlight any neglected warnings/errors.

Attachment: USRP2_WX.grc
Description: Binary data

Attachment: USRP2_WX.py
Description: Text Data

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