Re: [Discuss-gnuradio] ramping down (tx_empy continued)

[Brett Trotter]

So, then we have to go dac side, with ramping, and pay attention to tx_enable
as well...
I'll see what I can do.


Eric Blossom wrote:
> 
> On Tue, Jan 16, 2007 at 09:54:00AM -0800, Brett Trotter wrote:
>> 
>> an additional note- tested with the original firmware and ctrl+c'ing
>> still
>> leaves the sine-wave, with my new firmware, it goes away as desired..
> 
> Good.
> 
>> I remain perplexed as to why letting the program end normally results in
>> the
>> tx_empty not happening or the clock stopping or whatever is causing the
>> transmitter to transmit the last sample.
> 
> I believe that what's happening is that when it ends normally, the
> host library disables the transmit path.  When it's killed with ^C it
> just blows out and doesn't disable the transmit path (Note that the
> python code handles ^C properly)
> 
> Thus, what's happening in the "normal termination" case is that the
> tx_chain is disabled, and therefore the zeros that you're inserting
> into the head of the tx signal processing path aren't being
> processed and never get to the DACs...
> 
> So much for the simple solution ;)
> 
> Eric
> 
> 
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