Re: [Discuss-gnuradio] UHD and gr_block_executor error: "source <gr_block gr uhd usrp source (1)> produced no output. We're marking it DONE."

[Christopher Dean]

Hi Josh,

See below...

On 8/2/2011 3:19 PM, Josh Blum wrote:
> >      UHD source block got error code 0x9
> >      gr_block_executor: source<gr_block gr uhd usrp source (1)>  produced
> > no output.  We're marking it DONE.
> >
> > and, much more frequently,
> >
> >      UHD source block got error code 0x10
> >      gr_block_executor: source<gr_block gr uhd usrp source (1)>  produced
> > no output.  We're marking it DONE.
> They are totally bogus error codes.
> http://www.ettus.com/uhd_docs/doxygen/html/structuhd_1_1rx__metadata__t.html
>
> What do you mean by connecting A or B.

By connecting or disconnecting A or B, I mean using gr_block's connect 
and disconnect methods to connect A or B to the source.  Class A and 
class B are both subclasses of gr.hier_block2, so they each contain a 
part of a flowgraph.  Self.tb, below, is our instance of gr_top_block.

    self.tb.stop()
    self.tb.wait()
    self.tb.lock()
    self.tb.connect(self.tb.u_src, self.tb.b_flow)
    self.tb.disconnect(self.tb.u_src, self.tb.a_flow)
    self.tb.unlock()
    self.tb.start()

> Can you send some psudocode that
> demonstrates what you are doing that causes the problem?

The problem itself arises during this next block, which immediately 
follows the code above:

    if self.tb.tx_freq != self.minFreq:
        self.tb.lock()
        self.tb.set_snk_freq(self.minFreq)
        self.tb.unlock()
        self.tb.tx_beacon = True
    if self.rx_scan_freq != self.origTxFreq + index * self.step_size:
        self.tb.lock()
        self.rx_scan_freq = self.origTxFreq + index * self.step_size
        result = self.tb.set_src_freq(self.rx_scan_freq)
        self.tb.unlock()
        time.sleep(0.1)

Thanks!

Chris

> > I've tried leaving A and B connected the entire time, connecting B
> > before disconnecting A, disconnecting A before connecting B, but none of
> > these have alleviated the issue.  The error messages don't typically
> > occur until we've switched to B.  Also, I've been unable to find what
> > either of these error codes stand for in the GR and UHD documentation.
>
>
>
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