Re: [Discuss-gnuradio] Python and C++ codes of the blocks IEEE 802.11

[Cristian Rodríguez]

2017-06-25 5:23 GMT-05:00 Bastian Bloessl <address@hidden>:

Hi Christian,

> On 24. Jun 2017, at 22:50, Cristian Rodríguez <address@hiddencom> wrote:
>
> This parameter is no global, I mean, when I use the wifi_phy_hier.grc in the transceiver.grc or tx.grc, etc, If I modify the parameter before launch the simulation it is ok, the change has effect in the flowgraph, but if i add a QT GUI Range, and I modify it after the beginning of the simulation it doesn't have effect. Then I think the "set" of the parameter is no global (thinking in OOP).

Currently, the sensitivity is only through the constructor of the Sync Short block. That means it’s set when the block is instantiated and cannot be changed afterwards.

If you want to change the parameter while the flow graph is running (through a slider in the GUI, for example), you will have to extend the Sync Short block with a callback.
You could have a look at the Frame Equalizer block, for example. It allows changing the algorithm during run-time.

To extend Sync Short you have to:
- add the callback function to the XML description of the block:  (see here https://github.com/bastibl/gr-ieee802-11/blob/next/grc/ieee802_11_frame_equalizer.xml#L9)
- implement the callback for the block (note that the callback is a public function that has also to be added to the definition in /include/, and the use of a mutex since ‘work’ and the callback are called in different thread contexts).

If you implement this, please make a pull-request :-)

Thanks a lot for your answer Bastian.

I'll implement this and after i write again.
 

>
> Besides, this parameter is used in the WiFi Sync Short, and i want to modify this block to set that parameter as an input, and create another block in which i'm going to include a fuzzy system to set the parameter depending on other parameters.

For that use-case, I would extend the Sync Short block with an async message input (the gray ports in GRC) and let your fuzzy system send PMTs with the updated sensitivity values.

First i'll do the change in the xml, and when it is working i will introduce the other block.

Thanks for your time to read.

Best regards,

Cristian

 

Best,
Bastian




> But at the very first, I need to be able to modify the parameter Threshold (sensitivity) globally.
>
> <image.png>

>
> Thanks a lot for your time Marcus.
>
> Best regards,
>
> Cristian.
>
>
>
> Best regards,
>
> Marcus
>
>
> On 06/24/2017 11:17 PM, Cristian Rodríguez wrote:
>> Hi all,
>>
>> I hope all is going well.
>>
>> I was trying to modify the code of some blocks, where is usually the code of an specific block or flowgraph?
>>
>> Specifically, I want to modify the number of inputs in the wifi_phy_hier.grc, and put the variable Sensitivity as global, I mean, that i can modify it while the code is running, as rx_gain or tx_gain.
>>
>> But in general, where can i find the codes? Are there some predefined folders?
>>
>> Thanks in advance.
>>
>> Best regards,
>>
>> Cristian