From 8901251abbec6d08a13912bab774a0b32c05f16f Mon Sep 17 00:00:00 2001
From: David Lamparter <equinox@diac24.net>
Date: Thu, 20 Sep 2012 11:01:58 +0200
Subject: can: update protocol spec

---
 .gitignore   |  2 ++
 protocol.tex | 95 +++++++++++++++++++++++++++++++++++++++++++++++++++++++-----
 2 files changed, 90 insertions(+), 7 deletions(-)

diff --git a/.gitignore b/.gitignore
index 18bc66d..20c7cf7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,4 +8,6 @@
 *.aux
 *.log
 *.pdf
+*.out
+*.toc
 eeprom
diff --git a/protocol.tex b/protocol.tex
index a5828e0..1b57783 100644
--- a/protocol.tex
+++ b/protocol.tex
@@ -1,7 +1,9 @@
 \documentclass[11pt]{article}
+\usepackage[usenames,dvipsnames]{xcolor}
+\usepackage{hyperref}
+\hypersetup{colorlinks=true,linkcolor=blue}
 \usepackage{xltxtra}
 \usepackage{longtable}
-\usepackage[usenames,dvipsnames]{xcolor}
 \usepackage[font=small,labelfont=bf]{caption}
 \setmainfont[Mapping=tex-text]{Delicious-Roman}
 \setlength{\parindent}{0pt}
@@ -15,6 +17,8 @@
 \title{subbus protocol}
 \maketitle
 
+\tableofcontents
+
 \section{packet types}
 
 \begin{table}[h]
@@ -84,26 +88,42 @@ Information response:
 \end{itemize}
 
 \subsection{information blocks}
-\subsubsection{root block}
+
+The following information blocks can be requested from a node through the
+discovery protocol:
+
+\begin{table}[h]\tt
+  \caption{\textnormal{information blocks}}
+  \begin{tabular}{rl}
+	block & usage\\
+	\hline
+	0	& \textnormal{root information block} \\
+	1-3	& \textnormal{reserved} \\
+	4-7	& \textnormal{device specific} \\
+	8-15	& \textnormal{text description of the sensor (64 bytes max, 0-padded)}
+  \end{tabular}
+\end{table}
+
+\newpage
+\subsection{block 0: root block}
 
 The root information block describes generic device properties and should
 always be queried to determine device characteristics:
 
 \begin{table}[h]\tt
   \caption{\textnormal{information block 0 contents (root)}}
-  \begin{tabular}{rrl}
+  \begin{tabular}{rll}
   	offset & type & field \\
 	\hline
 	0	& uint8\_t & \textnormal{actor type} \\
 	1	& uint8\_t & \textnormal{sensor type} \\
-	2	& uint8\_t & \textnormal{flags / reserved} \\
+	2	& uint8\_t & \textnormal{block 4-7 usage} \\
 	3	& uint8\_t & \textnormal{data size (1-8 bytes)} \\
-	4	& uint16\_t & \textnormal{sublab grid location}
+	4	& uint16\_t & \textnormal{sublab grid location} \\
+	6	& uint16\_t & \textnormal{reserved for future use}
   \end{tabular}
 \end{table}
 
-\subsubsection{type codes}
-
 Actor type codes (byte 0):
 
 \begin{longtable}{rl}
@@ -132,6 +152,67 @@ Sensor type codes (byte 1):
 	\texttt{ff}	& custom / broken / ...
 \end{longtable}
 
+Block 4-7 usage (byte 2):
+
+\begin{longtable}{rl}
+	type code & type \\
+	\hline
+	\texttt{00}	& none (unused) \\
+	\hline
+	\texttt{01}	& DALI device information \\
+\end{longtable}
+
+\subsection{DALI (subtype 0x01) information blocks}
+
+\subsubsection{block 4: reserved}
+
+Block 4 is not currently used with DALI devices.
+
+\subsubsection{block 5: direct bus access}
+Direct DALI bus access. TBA.
+
+\subsubsection{block 6: device ROM information}
+
+Requesting information block 6 from a DALI device acquires ROM information and the random search
+address from the device.  The request will take about 0.3s to complete since the information is
+not cached.
+
+\begin{table}[h]\tt
+  \caption{\textnormal{DALI information block 6 contents (6 bytes)}}
+  \begin{tabular}{rll}
+  	offset & type & field \\
+	\hline
+	0	& uint8\_t	& \textnormal{DALI version number} \\
+	1	& uint8\_t	& \textnormal{DALI device type} \\
+	2	& uint8\_t	& \textnormal{DALI physical minimum dimming level} \\
+	3	& uint8\_t[3]	& \textnormal{DALI device search address} \\
+  \end{tabular}
+\end{table}
+
+\subsubsection{block 7: device state}
+
+Requesting information block 7 from a DALI device polls all volatile and writable nonvolatile state.
+The request will take about 0.3s to complete since the information is not cached.  It is intended
+that this block can be written to.
+
+\begin{table}[h]\tt
+  \caption{\textnormal{DALI information block 7 contents (8 bytes)}}
+  \begin{tabular}{rll}
+  	offset & type & field \\
+	\hline
+	0	& uint8\_t	& \textnormal{DALI current actual power level} \\
+	1	& uint8\_t	& \textnormal{DALI maximum level} \\
+	2	& uint8\_t	& \textnormal{DALI minimum level} \\
+	3	& uint8\_t	& \textnormal{DALI power on level} \\
+	4	& uint8\_t	& \textnormal{DALI system failure level} \\
+	5	& uint8\_t	& \textnormal{DALI fade rate / fade time} \\
+	6	& uint8\_t	& \textnormal{DALI status information} \\
+	7	& uint8\_t	& \textnormal{DALI short address} \\
+  \end{tabular}
+\end{table}
+
+\newpage
+
 \section{sublab running nodes}
 \begin{longtable}{rlll}
 	address & actor type & sensor type & node \\
-- 
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