Problem wiht peek32 method

GNU Radio
1

Hello!

I am working with USRP2 under Ubuntu 10.10 with the GNU Radio driver.

I was successful adding some setting registers to the FPGA code and
configuring them with the poke32 method (class usrp2_source_32fc_sptr,
module usrp2). What I am not able to perform is a reading of this
setting
registers using the peek32 method. I have several settings registers
with
different values but I always get “0” as result of peek32.

I read in the USRP-user mailing list that “none of the registers that
control setting have readback hardware”. Is this assumption also valid
for
the GNU Radio driver? Is there no way to read back a setting register?

Thanks!

Greetings.

Eduardo.

2

Hello!

I am working with USRP2 under Ubuntu 10.10 with the GNU Radio driver.

I was successful adding some setting registers to the FPGA code and
configuring them with the poke32 method (class usrp2_source_32fc_sptr,
module usrp2). What I am not able to perform is a reading of this
setting
registers using the peek32 method. I have several settings registers
with
different values but I always get “0” as result of peek32.

I read in the USRP-user mailing list that “none of the registers that
control setting have readback hardware”. Is this assumption also valid
for
the GNU Radio driver? Is there no way to read back a setting register?

Thanks!

Greetings.

Eduardo.

3

On Wed, Jun 15, 2011 at 01:26, Eduardo Lloret F.
[email protected]wrote:

I read in the USRP-user mailing list that “none of the registers that
control setting have readback hardware”. Is this assumption also valid for
the GNU Radio driver? Is there no way to read back a setting register?

This is correct. A common solution is to update a “shadow” copy of what
you
last poked into the register in a variable in your application. The
setting
registers don’t change except in response to a write from the host, so
the
shadow copy value remains accurate.

Johnathan