[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Discuss-gnuradio] Fewer than 8 bits per sample FPGA support

From: Eric Blossom
Subject: Re: [Discuss-gnuradio] Fewer than 8 bits per sample FPGA support
Date: Tue, 13 Mar 2007 08:08:18 -0700
User-agent: Mutt/1.5.9i

On Tue, Mar 13, 2007 at 01:10:53PM +0100, Davide Anastasia wrote:
> Il giorno dom, 04/03/2007 alle 22.55 -0800, Peter Monta ha scritto:
> > > The "short" version doesn't touch the data.  You'll be able to
> > unpack
> > > it youself.
> > 
> > Strange, I had some problem with rx_cfile not seeming to respect
> > the width parameter.  I'll try it again. 
> Hi List,
> I'm sorry to reuse this old topic, but I'm working on this feature.
> I recompile FPGA firmware using Peter' mod to obtain 1, 2, 4 and 8 bit
> width sampling. I'm using this firmware and the script attached to try
> it, but seems it doesn't work. I don't know if Peter (or someone else)
> use correctly this mod.
> I receive that:
> address@hidden:/home/rocker/Tesi/My Works/GNU Radio
> Experiment/rx_cfile# ./usrp_rx_cfile.py -m -f 1.575G -w 4 -R A -d 16 -N
> 1000 output.samples.4
> Upload new firmware!
> Using 4 bit sampling
> format = 0x248
> set_format = False
> Using RX d'board A: DBS Rx
> USB sample rate 4M
> Format setting fail.

I suspect you're getting caught by the sanity check in the host
library code.

Take a look at usrp_standard.cc, usrp_standard_rx::set_format and
remove the test for rx_format_is_valid.

I think the right way to work around this is to add another field to
the FPGA capability register that indicates whether or not the shifter
is implemented.


reply via email to

[Prev in Thread] Current Thread [Next in Thread]