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Re: [Discuss-gnuradio] Reading registers on the USRP
From: |
kevinmbo |
Subject: |
Re: [Discuss-gnuradio] Reading registers on the USRP |
Date: |
Thu, 14 Feb 2008 12:06:34 -0500 (EST) |
User-agent: |
SquirrelMail/1.4.10a |
I've read that post before. It more or less gave me reassurances on what
I had gathered that had to be done to implement a simple in-line
multiplier in the TX chain. The post tells me what registers are
readback, but not how to read them back. When I came across the post
originally, it pointed me in the right direction to where I should connect
the output of my new module.
-Kevin
> address@hidden wrote:
>> Hi,
>>
>> I'm having a little trouble reading the readback registers that are on
>> the
>> USRP. I know that most registers are write only with their contents
>> mirrored on the computer. The reason I want read those registers back
>> is
>> because of a custom unit I am testing. I currently load a custom
>> implementation on the USRP that consists of 1 TX chain and 2 custom
>> units,
>> one of which feeds back information into the unused readback ports
>> (rssi0
>> to rssi3). I'm able to read from the capabilities register using
>> '_read_fpga_register(FR_RB_CAPS)' and it returns a value that makes
>> sense.
>> When I try reading from any other register, the value returned is
>> consistently '0'. I'm reading the registers in a loop in case the value
>> changes after a given amount of time. I'm not sure what to try next,
>> can
>> someone give me a new direction?
>>
>> -Kevin
>
> This post might help:
>
> http://lists.gnu.org/archive/html/discuss-gnuradio/2007-05/msg00356.html
>
> -Roshan
>