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Message-Id: <20201022102946.18916-1-yegorslists@googlemail.com>
Date: Thu, 22 Oct 2020 12:29:46 +0200
From: yegorslists@...glemail.com
To: linux-can@...r.kernel.org
Cc: mkl@...gutronix.de, netdev@...r.kernel.org,
Yegor Yefremov <yegorslists@...glemail.com>
Subject: [PATCH] can: j1939: convert PGN structure to a table
From: Yegor Yefremov <yegorslists@...glemail.com>
Use table markup to show the PGN structure.
Signed-off-by: Yegor Yefremov <yegorslists@...glemail.com>
---
Documentation/networking/j1939.rst | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)
diff --git a/Documentation/networking/j1939.rst b/Documentation/networking/j1939.rst
index faf2eb5c5052..f3fb9d880910 100644
--- a/Documentation/networking/j1939.rst
+++ b/Documentation/networking/j1939.rst
@@ -71,10 +71,14 @@ PGN
The PGN (Parameter Group Number) is a number to identify a packet. The PGN
is composed as follows:
-1 bit : Reserved Bit
-1 bit : Data Page
-8 bits : PF (PDU Format)
-8 bits : PS (PDU Specific)
+
+ ============ ============== =============== =================
+ PGN
+ ----------------------------------------------------------------
+ 25 24 23 ... 16 15 ... 8
+ ============ ============== =============== =================
+ R (Reserved) DP (Data Page) PF (PDU Format) PS (PDU Specific)
+ ============ ============== =============== =================
In J1939-21 distinction is made between PDU1 format (where PF < 240) and PDU2
format (where PF >= 240). Furthermore, when using the PDU2 format, the PS-field
--
2.17.0
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