From: ian <ian>
Date: Tue, 20 Dec 2005 01:07:12 +0000 (+0000)
Subject: reset FSR2 to start of outbuf when we've set it up, so that we're not automatically... 
X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ijackson/git?a=commitdiff_plain;h=082e1fdd5ef07f67291bf58fbde1d3e73b7f3240;p=trains.git

reset FSR2 to start of outbuf when we've set it up, so that we're not automatically at end of message; do not loop copying messages to outbuf if buf0<7> is clear
---

diff --git a/detpic/detect.asm b/detpic/detect.asm
index 7560b96..f3ed1ca 100644
--- a/detpic/detect.asm
+++ b/detpic/detect.asm
@@ -304,13 +304,19 @@ i2csu_read_begin_either_tail
 	set_f	scand
 
 	mov_lfsr message_buffer, 1
+	bt_f_if0 buf0, 7
+	bra	msg_copy_exitnone
+	; some extra bytes to copy
+;...
 msg_copy_loop
 	mov_fw	POSTINC1
 	mov_wf	POSTINC2
 	bra_n	msg_copy_loop
-
+;...
+msg_copy_exitnone
 	mov_ff	FSR2L, outmsg_end
 	mov_ff	buf0_startval, buf0
+	mov_lfsr outbuf, 2
 
 reset_detectread
 ;  FSR1/buf0/message_buffer	any		set to empty