From: ian <ian>
Date: Fri, 30 Dec 2005 01:48:04 +0000 (+0000)
Subject: make sure we do not answer Z to i2cmu_write_start when it's not ours, in case main... 
X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ijackson/git?a=commitdiff_plain;h=6483de41cba82447f16bc02a2187b0f7fa7e8aef;p=trains.git

make sure we do not answer Z to i2cmu_write_start when it's not ours, in case main program has just selected
---

diff --git a/detpic/panic.asm b/detpic/panic.asm
index 1be0db6..550aa4c 100644
--- a/detpic/panic.asm
+++ b/detpic/panic.asm
@@ -20,6 +20,7 @@ panicst_restart_i2c		equ	7
 panicst_acked			equ	5
 panicst_ferroerr		equ	4
 panicst_writeslave		equ	3
+panicst_onlyourwrite		equ	2
 
 panic_valcount			res	1
 
@@ -463,6 +464,7 @@ write_if_setbytetowrite
 	bc_w	7
 	mov_wf	panic_valcount
 	bs_f	panicst, panicst_writeslave
+	bs_f	panicst, panicst_onlyourwrite
 	return
 
 ;----------
@@ -500,9 +502,11 @@ pan_i2cmu_read_got_byte
 ;----------
 pan_i2cmu_write_next_byte
 	mov_fw	panic_valcount
-	bs_f	STATUS, Z
-	bt_f_if1 panicst, panicst_writeslave
 	bc_f	STATUS, Z
+	bt_f_if0 panicst, panicst_onlyourwrite
+	retlw	0x00
+	bt_f_if0 panicst, panicst_writeslave
+	bs_f	STATUS, Z
 	bc_f	panicst, panicst_writeslave
 	return