Forum: GNU Radio TX modulator shadow?

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Ac73d95c8ccddff9ecae369bcb80a923?d=identicon&s=25 George Nychis (Guest)
on 2007-02-25 02:43
(Received via mailing list)
Hey all,

I was wondering what the following does when initializing the host end
of the
transmit chain:

   for (int i = 0; i < MAX_CHAN; i++){
     d_tx_modulator_shadow[i] = (TX_MODULATOR_DISABLE_NCO

Thanks :)

- George
745d8202ef5a58c1058d0e5395a78f9c?d=identicon&s=25 Eric Blossom (Guest)
on 2007-02-25 03:14
(Received via mailing list)
On Sat, Feb 24, 2007 at 08:42:35PM -0500, George Nychis wrote:
> Thanks :)
> - George

It keeps us from having to make a round-trip to the AD9862 over the
USB when we need to know the current contents of a particular
register.  The registers in question contain info that may come from
different sources.  In this particular case, AD9862 register 20
contains bits for "Negative Fine Tune", "Fine Mode", "Real Mix",
"Negative Coarse Tune", and "Coarse Modulation".

We want to be able to do a "read-modify-write" without having to pay
the overhead for the read.

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