Protocol Formatter (Async): Difference between revisions

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(Created page with "Category:Block Docs Category:Stub Docs This is the template for the "Page-per-block Docs". This first section should describe what the block...")
 
(add example flowgraph)
 
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[[Category:Block Docs]]
[[Category:Block Docs]]
[[Category:Stub Docs]]
Uses a header format object to append a header onto a PDU.
This is the template for the [[:Category:Block_Docs|"Page-per-block Docs"]]. This first section should describe what the block does and how to use it, using however many paragraphs necessary. Note that the title of the wiki page should match the block's name in GRC, i.e. the one defined in the block's .grc file.  Look at the [[FFT]] Block for a good example.
 
This block takes in PDUs and creates a header, generally for MAC-level processing. Each received PDU is assumed to be its own frame, so any fragmentation would be done upstream in or before the flowgraph.
 
The header that is created and transmitted out of the 'header' message port as a PDU. The header is based entirely on the object, which is an object derived from the header_format_base class. All of these packet header format objects operate the same: they take in the payload data as well as possible extra metadata info about the PDU; the format object then returns the output PDU as a PMT argument along with any changes to the metadata info PMT.
 
For different packet header formatting needs, we can define new classes that inherit from the header_format_base block and which overload the header_format_base::format function.


As this is a basic template, it's also in the [[:Category:Stub_Docs|"Stub Docs category"]]. Please improve it.


== Parameters ==
== Parameters ==
(''R''): <span class="plainlinks">[https://wiki.gnuradio.org/index.php/GNURadioCompanion#Variable_Controls ''Run-time adjustable'']</span>


; Param 1 (''R'')
; Format Obj.
: Description of parameter, provide any tips or recommended values.  Note that the name of the parameter above should match the param's label that shows up in grc (e.g. Sample Rate).
: The format object to use when reading the header. This block uses a format object derived from a header_format_base class.


; Param 2
== Example Flowgraph ==
: blah blah blah


== Example Flowgraph ==
This flowgraph can be found at [https://github.com/gnuradio/gnuradio/blob/master/gr-digital/examples/packet/packet_tx.grc]


Insert description of flowgraph here, then show a screenshot of the flowgraph and the output if there is an interesting GUI.  Currently we have no standard method of uploading the actual flowgraph to the wiki or git repo, unfortunately.  The plan is to have an example flowgraph showing how the block might be used, for every block, and the flowgraphs will live in the git repo.
[[File:Packet_tx_fg.png|746px]]


== Source Files ==
== Source Files ==


; C++ files
; C++ files
: [https://github.com/gnuradio/gnuradio TODO]
: [https://github.com/gnuradio/gnuradio/blob/master/gr-digital/lib/protocol_formatter_async_impl.cc]


; Header files
; Header files
: [https://github.com/gnuradio/gnuradio TODO]
: [https://github.com/gnuradio/gnuradio/blob/master/gr-digital/lib/protocol_formatter_async_impl.h]


; Public header files
; Public header files
: [https://github.com/gnuradio/gnuradio TODO]
: [https://github.com/gnuradio/gnuradio/blob/master/gr-digital/include/gnuradio/digital/protocol_formatter_async.h]


; Block definition
; Block definition
: [https://github.com/gnuradio/gnuradio TODO]
: [https://github.com/gnuradio/gnuradio/blob/master/gr-digital/grc/digital_protocol_formatter_async.block.yml]

Latest revision as of 14:23, 6 April 2021

Uses a header format object to append a header onto a PDU.

This block takes in PDUs and creates a header, generally for MAC-level processing. Each received PDU is assumed to be its own frame, so any fragmentation would be done upstream in or before the flowgraph.

The header that is created and transmitted out of the 'header' message port as a PDU. The header is based entirely on the object, which is an object derived from the header_format_base class. All of these packet header format objects operate the same: they take in the payload data as well as possible extra metadata info about the PDU; the format object then returns the output PDU as a PMT argument along with any changes to the metadata info PMT.

For different packet header formatting needs, we can define new classes that inherit from the header_format_base block and which overload the header_format_base::format function.


Parameters

Format Obj.
The format object to use when reading the header. This block uses a format object derived from a header_format_base class.

Example Flowgraph

This flowgraph can be found at [1]

Packet tx fg.png

Source Files

C++ files
[2]
Header files
[3]
Public header files
[4]
Block definition
[5]
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