From: ian <ian>
Date: Mon, 28 Nov 2005 04:05:42 +0000 (+0000)
Subject: some notes about surrounding things
X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ijackson/git?a=commitdiff_plain;h=41e9cc6c6cfb55d218729aaf992809555b50b267;p=trains.git

some notes about surrounding things
---

diff --git a/detpic/detect.asm b/detpic/detect.asm
index 31698ed..f4c4ddc 100644
--- a/detpic/detect.asm
+++ b/detpic/detect.asm
@@ -3,7 +3,9 @@
 ; FSR2 is used as outgoing message buffer pointer (reading),
 ;  ie private to this file
 ;
-; FSR1 is used as pointer to where to add bytes of message
+; FSR1 is used as pointer to where to add bytes of message; it
+;  points to previous byte whose top bit must be set before
+;  adding another bit
 
 max_messages equ 4
 
@@ -14,12 +16,27 @@ max_messages equ 4
  scand res 1
  scane res 1
  buf0 res 1
+ message_buffer res max_messages
 
  udata
  outgoing_buffer res max_messages+2
- message_buffer res max_messages
 
 	code
+
+slave_add_short_message
+;  W		message		unchanged
+	bc_f	INTCON*,GIEH fixme check this works
+	bs_f	POSTINC1,7
+	mov_wf	INDF1
+	bs_f	INTCON*,GIEH
+	return
+
+
+init
+ set fsr2
+ set fsr1
+ ram locations see above
+
 			;	80 40 20 10  08 04 02 01
 			;	 7  6  5  4   3  2  1  0