Re: [Discuss-gnuradio] Auxiliary ADC

[Eric Blossom]

On Wed, Jan 20, 2010 at 07:20:43PM +0100, Christoph Thein wrote:
> 
> > On 01/19/2010 10:35 AM, Christoph Thein wrote:
> > >> On 01/19/2010 09:47 AM, Christoph Thein wrote:
> > >>> Hi,
> > >>>
> > >>> is there a possibility to read the data coming from the auxiliary ADC
> > >>> (AD7922) at the moment?  I couldn't find any hint in the code or on the
> > >>> mailing list that could point me to a good direction to start.
> > >>>
> > >>> Just out of interest: What should the auxiliary DAC (AD5623) be used
> > >>> for?
> > >>
> > >> The aux ADCs can be read, and they are used with some of the
> > >> daughterboards to measure received signal level (RFX900-RFX2400) or
> > >> temperature (WBX).
> > >>
> > >> The AUX DACs are used to set gains on most of the daughterboards.
> > >>
> > >> Matt
> > >
> > > Hi Matt,
> > >
> > > Thanks for your answer.
> > >
> > > is the measuring also possible for the RXCV2450 or what is missing to
> > > achieve it?
> > 
> > Yes, the XCVR2450 also has RSSI measurement capabilities.
> > 
> > Matt
> > 
> 
> The USRP1 uses the read_aux_adc function to get the values. Does the 
> read_gpio 
> replace it for the USRP2? If not how is the USRP2 accessing the aux ADC?
> 
> Cheers,
> Christoph

At this point, firmware in the USRP2 controls the daughterboards, and
the read_aux_adc functionality is not exported to the host.

Eric