Re: [Discuss-gnuradio] Dynamically changing parameters of a block

[kaleem ahmad]

Any suggestions!!!!!!!!!!!!!!!


kaleem ahmad wrote:
> 
> Hi Eric and others,
> 
> I also have a similar problem, but it is not limited to 'gain control',
> Actually I want to implement an echo back or ping pong transmission
> system.
> 
> First I implemented two separate transmitt and receive flow graphs in two
> separate transmit(), and receive() functions as mentioned in the
> following:
> 
> Master Transceiver:
> 
>       Transmit()            Transmitt one data packet
>       Receive()             Wait in receive for the echoed back packet or
> timeout
> 
> Slave Transceiver:
> 
>       if (Receive()):             Always wait in receive
>              Transmit()            Transmitt back the received data packet
> 
> But in this method I get an error 'cant open usb device....cant open USRP
> 0/1'
> 
> Then I found flowgraph.disconnect() method and thought that I should
> implement a single flowgraph which can dynamically connect different
> blocks to transmit and then disconnect and connect with receive blocks and
> so on...
> 
> Is it possible and is there any example code which doing something like
> this or otherwise can you please suggest me some way to do this.
> 
> Thanks
> 
> Kaleem Ahmad
> 
> 
> 
> Eric Blossom wrote:
>> 
>> On Fri, Sep 26, 2008 at 06:40:29PM -0700, Karthik Vijayraghavan wrote:
>>> Suppose I have myblock = gr.multiply_const_ff(var_value) sitting
>>> somewhere in my flowgraph. I want the user to be able to change the
>>> value of var_value by using a slider. I know how to make a slider, but
>>> I am not able to find information on how to dynamically change the
>>> block at runtime. One option that I can think of is to
>>> 
>>> 1. Stop the flow graph
>>> 2. Disconnect the block in question with any block it may be connected
>>> to
>>> 3. Redefine the block with new parameters
>>> 4. Reconnect the block
>>> 5. Restart the flow graph
>>> 
>>> I tried the above method, but I did know how to redefine an existing
>>> block. Do I have to somehow "destroy" or "clear" the existing block
>>> before defining another block with the same name?
>>> 
>>> Karthik
>> 
>> 
>> No need for all of that, just call 
>> 
>>   myblock.set_k(new_value)
>> 
>> while it's running.
>> 
>> Eric
>> 
>> 
>> _______________________________________________
>> Discuss-gnuradio mailing list
>> address@hidden
>> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>> 
>> 
> 
> 

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