Re: [Discuss-gnuradio] question about headr_payload_demux module

[Martin Braun]

On 10.08.2014 10:21, Tiankun Hu wrote:
> Hi all,
> I am reading "header_payload_demux" module, I have some questions about it.
> 1, in "header_payload_demux_impl.cc" line 235, seems need update nread's
> value
>      nread += trigger_offset;
>      I think  without this update, the first header will check failed,
> if input data not include      complete "d_header_len" ofdm symbols

I don't have that line in my version of the HPD.
This is what I have on L235:

          in += trigger_offset * d_itemsize;

And this advances the input buffer pointer to the trigger position.

> 2, why in "case STATE_HEADER_RX_FAIL:" line 218, need consume one input
> item?

To avoid an infinite loop.

> 3, does the control message's handler function can disturb
> "general_work"(like a soft interrupt)?, or these handler only run
> before/after "general_work".

They are asynchronous and are always called when a message is passed.

MB