Re: [Discuss-gnuradio] RS232_RXD/TXD on daughtercard interface

[Matt Ettus]

On 01/19/2010 09:41 AM, John Orlando wrote:
> Hi all,
> A while back I noticed there are two signals called RS232_RXD and
> RS232_TXD exposed on the PMC connector going to the daughtercard slots
> on the USRP.  Tracing these back on the USRP schematic, they go to the
> Cypress EZUSB chip.  I searched around a bit but didn't find any
> reference to any daughtercard using these, nor did grep find any
> reference to these in the 3.2.2 release of GNUradio.  Is there any way
> to send/receive UART data to these lines from within GNUradio?  If
> not, what was the intent with these lines?
>
> Thanks much...


Those have never been used.  The original intention was to use it as a 
UART.  The USRP2 does not connect to those pins, so it's not a good idea 
to use them.

Matt