Re: [Discuss-gnuradio] FPGA mods

[Eric Blossom]

On Mon, Feb 26, 2007 at 03:49:19PM -0800, Dan Halperin wrote:
> Hi,
> 
> I'm working on FPGA mods to push a little bit of work off of the 
> computer onto the USRP's FPGA. If I understand correctly, the right way 
> to do what I want is to create a new config file (e.g. a modification of 
> usrp_std_config_2rxhb_2tx.vh) with my changes in the defines.
> 
> First, the comment: "// IF RX_ON is not defined, there is *no* transmit 
> circuitry built" -- that should be `receive circuitry', yes?

That's right.  I've fixed in svn.

> Second, in what applications are multiple receive and transmit channels 
> are used? They aren't used in tunnel.py right? I want to be doing RX and 
> TX on the RFX2400 as in tunnel.py; this application only uses one RX and 
> one TX channel, so I can define RX_SINGLE and TX_SINGLE instead of the 
> DUAL versions?

Yes.

However, because I was a lazy bum, I didn't add the conditionals
that distinguish between TX_SINGLE and TX_DUAL.

You'll need to add the appropriate `ifdef TX_EN_0 and TX_EN_1 gating in
usrp_std.v.  [Please send a patch.]

And send your new config file too.  I assume it's going to be
usrp_std_config_1rxhb_1tx.vh

Thanks,
Eric