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Re: [Discuss-gnuradio] Seeking a method to expose a floating point value


From: Ed Coleman
Subject: Re: [Discuss-gnuradio] Seeking a method to expose a floating point value
Date: Tue, 19 Jul 2016 16:11:15 -0400

Hello Marcus:

Thank you for the quick reply.  My initial thought was that the external code would query the grc block at a rate of 32kHz.  I WAS assuming that there would be a unique value available every 1/32000s.   Since this is not the case, I'm left wondering how best to get all 32000samples per second out of this block and into an array in python so that I can manipulate the data.  It seems as though this may be a more in depth question than I realized.

-Ed


-------------------------

Hi Ed,

to what do you need that number "delivered"? That's the interesting point here; whether your external code "polls" a function, or expects to get a message of some sorts, or listens on a socket, or...

Also note that it's not really like there's a constant "trickle" of random numbers, one every 1s/32000; GNU Radio is buffer-based, meaning that throttle gets a block of e.g. 4096 input items, passes them, and then waits 4096/32000 until it looks for new input. 

Best regards,

Marcus


On 19.07.2016 20:32, Ed Coleman wrote:
Considering the simple flow graph attached, a random number is generated at a sample rate of 32kHz.  I’m seeking a method to ‘expose’ the floating point number to external python code. This code would need to be updated at every 'tic' of the sample rate.  Initially I had considered using the probe function but, from what I have read, it appears that is not appropriate for such a fast update rate.  Any suggestions would be appreciated.

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