Re: [Discuss-gnuradio] Pre-cog repo is down?

[George Sklivanitis]

John,

Thanks for the attachments.

I think that "the async. nature of the msg-based blocks means there's no back pressure on your vector_source block" was the problem. 

Thanks again, 

-George

On Tue, Feb 5, 2013 at 12:01 AM, John Malsbury <address@hidden> wrote:

George,

I don't have any hardware where I am, so I have the UHD source disabled.  The speed (or lack there of) of the python block may be what is causing this issue.  It's also possible that the async. nature of the msg-based blocks means there's no back pressure on your vector_source block and it is generating samples as quickly as the cpu allows.  (anyone, chime in if you know better?)  When I insert a throttle before the stream to blob conversion, things seem to work OK. 

See attached.

I've also attached another example for you to work with that has working mod and demod setup with a 'heartbeat' block that generates a periodic message.

-John

On Mon, Feb 4, 2013 at 8:28 PM, George Sklivanitis <address@hidden> wrote:

I am in v3.6.2.-3 and the problem still appears after removing the burst gate. 

Moreover, is there a way to test the data after the conversion of the stream to blobs, either through Octave or Matlab (by connecting a file sink at the flowgraph)?

-George

On Mon, Feb 4, 2013 at 11:23 PM, John Malsbury <address@hidden> wrote:

The file worked for me, but I'm testing with a machine with an older version of GNU Radio (3.6.2).  I will upgrade and retest.  In the meantime, can you remove the burst gate and tell me if the flowgraph runs without error?

-John

On Mon, Feb 4, 2013 at 8:06 PM, George Sklivanitis <address@hidden> wrote:

I am sorry, it was a typo.
The grc file generating the reported error is attached.

-George

On Mon, Feb 4, 2013 at 10:58 PM, John Malsbury <address@hidden> wrote:

...   GMSK_mod  -> packet_framer -> multiplier -> Burst-Tag   ...

the packet_framer should come before the modulator.  Not after.  Is this actually how it is connected or is there just a typo?

Send me the GRC file.

On Mon, Feb 4, 2013 at 7:54 PM, George Sklivanitis <address@hidden> wrote:

Hi John,

I suspected that this was where it has transferred. Though, by installing pre-cog along with the extras and using
the packet_framing of precog instead of extras I get the following error as I posted before,

gr_fir_fff: using SSE
Uhandler caught exception: in method 'gr_block_gw_message_type_work_args_return_value_set', argument 2 of type 'int'
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/gnuradio/extras/block_gateway.py", line 53, in eval
    try: self._callback()
  File "/usr/local/lib/python2.7/dist-packages/gnuradio/extras/block_gateway.py", line 124, in __gr_block_handle
    ) for i in self.__out_indexes],
TypeError: in method 'gr_block_gw_message_type_work_args_return_value_set', argument 2 of type 'int'
thread[thread-per-block[5]: <gr_block mod_pkts2 (3)>]: caught unrecognized exception

What is more, after replacing packet_framer with the framer of extras repo, by trying to simulate

only the PHY level of precog

transmitter
 (Vector_source -> stream_to_blob -> GMSK_mod  -> packet_framer -> multiplier -> Burst-Tag -> USRP_sink)

and on the other side
receiver:

(USRP_source -> packet_deframer -> GMSK_demod -> blob_to_s)

On 2/4/13 10:42 PM, John Malsbury wrote:

https://github.com/jmalsbury/pre-cog

On Mon, Feb 4, 2013 at 7:41 PM, George Sklivanitis <address@hidden> wrote:

Hello guys, 

Is https://github.com/buoyboy/pre-cog down 

or I am the only one not being able to have access?

-George

--
Sklivanitis Georgios
Postgraduate Student

_______________________________________________
Discuss-gnuradio mailing list
address@hidden
https://lists.gnu.org/mailman/listinfo/discuss-gnuradio

-- 
Sklivanitis Georgios
Ph.D Student
Communications Division,
Department of Electronics and Electrical Engineering
University at Buffalo, The State University of New York
North Campus, Office 205, Furnas Hall
Buffalo, NY 14260
www.acsu.buffalo.edu/~gsklivan

--
Sklivanitis Georgios
Postgraduate Student

Telecommunications Division
Technical University of Crete
ECE Dept.
Tel. : 28210 59257

--
Sklivanitis Georgios
Postgraduate Student

Telecommunications Division
Technical University of Crete
ECE Dept.
Tel. : 28210 59257

--
Sklivanitis Georgios
Postgraduate Student