Re: [Discuss-gnuradio] Reprogram FPGA

[Eric Blossom]

On Tue, Jul 24, 2007 at 04:19:58PM -0700, Roshan Baliga wrote:
> S Mande wrote:
> >1) Do I need a 3rd party tool to transfer my code to the FPGA on USRP ? 
> >I remember using a JTAG cable and Active-HDL for this task when i worked 
> >with Aldec procesors.
> 
> I'm sure there are multiple ways to do this, but I just use the existing 
>  usrp framework to load the RBF file onto the fpga. That is, when I 
> generate a new RBF file, I throw it into 
> /usr/local/share/usrp/rev4/std_2rxhb_2tx.rbf and load it up with my own 
> C application that links to libusrp.so. It's the quick and dirty way, 
> but hey, it works.
> 
> >2) I believe that the firmware is loaded everytime I run GNU radio. Is 
> >it that I replace the existing fpga Verilog firmware code ( .v file 
> >) from its existing location .i.e. gnuradio folder
> >with my modified Verilog firmware code ?
> 
> The RBF file that is loaded is picked up from a predetermined location. 
> In my case, with a rev 4 usrp, it's 
> /usr/local/share/usrp/rev4/std_2rxhb_2tx.rbf. In your quartus project, 
> the file you want is in usrp/fpga/toplevel/usrp_std/usrp_std.rbf
> 
> If you replace the file in /usr/local... with a new rbf file, the 
> gnuradio code will load it next time you power cycle/run the USRP.
> 
> -Roshan

You can also specify the rbf file name in the usrp constructor:

  u = usrp.sourc_c(..., fpga_filename="myfile.rbf")

Eric