Eric Blossom wrote:
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 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
_______________________________________________
Discuss-gnuradio mailing list
[email protected]
http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Does the firmware currently do anything with the Aux ADC? I see the
definitions for reading from the SPI controller, and the function
(firmware/lib/lsadc.c: lsadc_read_rx(int)) which appears to be the only
place that reads from the correct SPI device. Also, it looks like it
would be difficult to read the value directly from inside the FPGA: i.e.
if I wanted to use the RSSI value for an AGC or squelch control, I'd
probably be best served by periodically reading the value from within
the firmware, and pushing it back into a register in, e.g., dsp_rx_regs.
This would likely mean I'd have some additional inherent delay in using
the value in the DSP chain. Is there a better way - e.g. I assume it
would be possible to load the data from the SPI controller in the FPGA,
but does that come with a (much?) larger cost in terms of logic, and
therefore area/etc.?
Thanks,
Doug
--
Douglas Geiger
Code 5545
U.S. Naval Research Laboratory
Washington, DC 20375
(202) 767-9048
[email protected]
_______________________________________________
Discuss-gnuradio mailing list
[email protected]
http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
