Re: [Discuss-gnuradio] writing to fpga registers

[Eric Blossom]

On Thu, Oct 19, 2006 at 05:40:05AM -0700, seph 004 wrote:
> Hi
> 
> I am having a bit of trouble trying to work out how to write to FPGA 
> registers from a c++ program. I found two methods that would do it, namely 
> '_write_fpga_reg' in 'usrp_basic' and 'usrp_write_fpga reg' in 'usrp_prims'. 
> I tried to use the usrp_prims method, but it requires a handle on the usb 
> which if, I'm not mistaken is already held by usrp_standard_tx.
> 
> I'm trying to transmit with usrp_standard_tx, then write the registers, then 
> receive with usrp_standard_rx. For the usrp_basic method, I'm not sure how to 
> use that method as my attempts have produced segmentation faults. This is 
> what i tried:
> 
> usrp_basic *ucom;
> 
> then to write 
> 
> bool fine1 = ucom->_write_fpga_reg (77, 10);
> 
> Regards
> Lance

You don't want to instantiate usrp_basic.  Use usrp_standard_tx or 
usrp_standard_rx.

Eric