Adding EOB when using Vectors

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#1

?Dear All,

I am trying to use TX_TIME, SOB, EOB. How do I add the EOB when I am
using a vector?

The block I have created takes in vector of 47520 samples, i.e. one
item, I want to add TX_TIME and SOB to the first sample. This is no
problem, I add it to the item. After the following ‘vector_to_stream’
conversion, the TX_TIME and SOB map through to item 0, 47520, 95040 etc.

But how do I get the EOB to be on item 47519?

Regards,

David

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#2

Use tagged streams. usrp_sink will place the EOB on your last sample,
even if bursts are of different lengths in that case.

M

#3

Thanks. Does it matter what the tag is, does it have to be “packet_len”?

DH

From: [email protected]n.invalid
[email protected]n.invalid on
behalf of Martin B. [email protected]
Sent: 23 January 2015 18:18
To: [email protected]
Subject: Re: [Discuss-gnuradio] Adding EOB when using Vectors

Use tagged streams. usrp_sink will place the EOB on your last sample,
even if bursts are of different lengths in that case.

M

On 01/23/2015 06:47 PM, David Halls wrote:

conversion, the TX_TIME and SOB map through to item 0, 47520, 95040 etc.

Cambridge CB4 0GZ, England. Web: www.toshiba.eu/research/trl

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#4

Thanks Martin,

Unfortunately I couldn’t get this to work, even when adding packet_len.

To solve the problem I added another custom sync block called ‘add_EOB’
that takes in packet_len and adds EOB on the relevant item.

            for(int i=0; i<noutput_items; i++)

{
if( nitems_written(0)+i == (d_samples-1)+d_burst_num*d_samples )
{
add_item_tag(0, //stream ID
nitems_written(0)+i,
pmt::string_to_symbol(“tx_eob”), //tag name
pmt::from_bool(1)//, //set this true to indicate end of burst
//pmt::string_to_symbol(id.str())
);
d_burst_num++;
}
out[i] = in[i];
}

From: [email protected]n.invalid
[email protected]n.invalid on
behalf of Martin B. [email protected]
Sent: 23 January 2015 18:56
To: [email protected]
Subject: Re: [Discuss-gnuradio] Adding EOB when using Vectors

It hast to be whatever you set it to when you make the block. See the
make() function in the manual for a description.

Cheers,
M

On 01/23/2015 07:20 PM, David Halls wrote:

Subject: Re: [Discuss-gnuradio] Adding EOB when using Vectors

I am trying to use TX_TIME, SOB, EOB. How do I add the EOB when I am

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#5

It hast to be whatever you set it to when you make the block. See the
make() function in the manual for a description.

Cheers,
M