|
From: | Jose Torres Diaz |
Subject: | Re: [Discuss-gnuradio] Problems passing the control between blocks - message passing |
Date: | Thu, 18 Oct 2012 09:46:41 +1030 |
So, block 2 is never processing the data? What are you using to set the "N"? Does the uhd_amsg_source have the same i/o as the original block - no inputs, one msg output?
If you're looking to something to generate periodic msg's with arbirtrary key and value, the heart_beat block in my pre-cog branch might help...
-JohnOn Tue, Oct 16, 2012 at 11:34 PM, Jose Torres Diaz <address@hidden> wrote:
Hi John,
I wrote the code in C++ based on UHD_AMsg_source.cc, provided in GRExtras. In my work function, I've finished it using return -1 (ie. the block has finished processing correctly) as shown below:
int work(
const InputItems &,
const OutputItems &
){
//work definition here (ie. generate a packet and post downstream)
return -1; //done running, work done status
}
However, in that way the block in GNU Radio Companion runs only once. The other possibility is not to use "return" at all, but in that case what I have is:
1. BLOCK 1 generates a packet
2. BLOCK 1 post the packet downstream
Step 1 and 2 repeats "N times". When finishes, it gives the control to BLOCK 2 to process the message. However, I need a sequence as follows:
1. BLOCK 1 generates a packet
2. BLOCK 1 post the packet downstream
3. BLOCK 2 process the packet
4. BLOCK 2 post the message again downstream and so on...
Step 1 to 4 should repeat "N times".
Thanks again for your help,
JoseOn Wed, Oct 17, 2012 at 4:52 PM, John Malsbury <address@hidden> wrote:Jose,
Try a while(1) with a block and a blocking call to pop msg's off the queue:
self.pop_msg_queue()
Should help you avoid the return -1
Or maybe I've misunderstood your problem...?
-JohnOn Tue, Oct 16, 2012 at 11:18 PM, Jose Torres Diaz <address@hidden> wrote:
_______________________________________________Hi All,
I'm working with 2 blocks that I've created using "UHD_AMsg_Source" as a reference model. In these blocks, I am passing pmt_dict type as messages, ie:
this->post_msg(0, AMSG_KEY, dictionary,_id);
Where, dictionary contains data/metadata that I can read in the next block downstream.
BLOCK 1 -- (pmt_dict included in the message) --> BLOCK 2
The blocks are working ok, but the problem is that when I want to generate several packets and post them downstream, BLOCK 1 runs until finishes and then BLOCK 2 takes the control until finishes. The problem is the "return" sentence in my work function. I did 2 possible ways
Option 1: Using -1
work {
//work here
return -1
}
In this way BLOCK 1 stops working after one iteration and it does not run as many times as I want.
Option 1: Not using return
work {
//work here
}
In this way BLOCK 1 runs many times and posts messages downstream all those times, but it gives the control to BLOCK 2 when it finishes. Then, BLOCK 2 takes the messages from the message queue. However, this implementation is not useful for me. BLOCK 1 should post a message downstream and then, BLOCK 2 takes the message and work with the packet.
Any suggestion is welcome, thanks a lot for your time,
Regards,
Jose
Discuss-gnuradio mailing list
address@hidden
https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Prev in Thread] | Current Thread | [Next in Thread] |