From 4772b911900cd53acf401433ae02f079aeed81ab Mon Sep 17 00:00:00 2001
From: ceb <ceb>
Date: Sun, 23 Jan 2005 23:50:48 +0000
Subject: [PATCH] start if i2c program added PIC ID info into README.protocol

---
 cebpic/README.protocol | 13 +++++++++++++
 cebpic/i2c-test.asm    | 20 ++++++++++++++++++++
 2 files changed, 33 insertions(+)

diff --git a/cebpic/README.protocol b/cebpic/README.protocol
index f97fa8a..5b5582c 100644
--- a/cebpic/README.protocol
+++ b/cebpic/README.protocol
@@ -1,3 +1,6 @@
+NMRA
+====
+
 NMRA packets from the computer to the PIC should consist of 8-bit bytes.
 
 bits 6-0 contain the data to be sent to the track
@@ -13,3 +16,13 @@ Messages longer than this will cause things to get confused at the moment.
 baud rate 9600
 most significant bit first
 8n1
+
+
+Flash memory
+============
+
+Byte 20 0000h bit 0 is 1 for the main PIC and 0 otherwise
+
+
+I2C
+===
diff --git a/cebpic/i2c-test.asm b/cebpic/i2c-test.asm
index 901e6cb..baffa73 100644
--- a/cebpic/i2c-test.asm
+++ b/cebpic/i2c-test.asm
@@ -106,6 +106,26 @@ initialise
 	bcf	IPR1,5,0	; set to low-priority interrupt
 
 
+;----------------------------------------------------------------------------
+
+; i2c setup
+
+; p68
+; p314
+; p 275 ID locs
+
+; test whether master PIC (location 20 0000h bit 0; 1 if true)
+; by doing:
+; set tblptr (tblptru/tblptrh/tblptrl)
+; tblrd *
+; result in tablat
+
+; i2c_master_setup if so, i2c_slave_setup if not
+
+
+
+
+
 ;----------------------------------------------------------------------------
 
 ; interrupt set-up
-- 
2.30.2