Re: [Discuss-gnuradio] UHD and gr_block_executor error: "source produced no output. We're marking it DONE."

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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