From: ian <ian>
Date: Sun, 25 Dec 2005 23:26:45 +0000 (+0000)
Subject: delete old design comment from ceb for detect
X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ijackson/git?a=commitdiff_plain;h=33e9423051fcff5141c891a7d60156c9bd79f6d0;p=trains.git

delete old design comment from ceb for detect
---

diff --git a/detpic/detect.asm b/detpic/detect.asm
index 6ebbd1a..318b45d 100644
--- a/detpic/detect.asm
+++ b/detpic/detect.asm
@@ -425,103 +425,3 @@ read_detection_head_master_badmore
 
 ;======================================================================
  include final.inc
-
-
-
-;****************************************************************************
-
-        code
-
-;****************************************************************************
-; needs conditional for master
-
-; MASTER PIC
-; triggered whenever there is space in the serial buffer
-
-; reads detection data from subpics over i2c and sends new data out to
-; external computer
-
-
-
-
-
-; Associated registers etc.:
-; subpic s	? bits		current subpic for dtction data retrieval
-; Psa-e		40 registers	current state of detection data from
-; 				ports a-e of all subpics (including self)
-; Csa-e		40 registers	current state of knowledge of
-; 				external computer
-; ???		???		bits for keeping track of subpic #
-; ???		???		bits for keeping track of detect msg creation
-; 				and posn in Psa-e checking
-; Ma-e		5 bytes		bitmask for reading detect data from ports
-
-
-
-; ask sub-pic s for data
-; (i.e. send i2c request - will need to work out how to differentiate this
-; from requests fior other data from subpics, or make a general routine to
-; handle all sorts of data a subpic might send back)
-
-; if no change, advance subpic # and return
-
-; if change, copy data from subpic x into xa-e
-
-; compare Psa-e with Csa-e
-
-; if no change, advance subpic # and return
-
-; if change, for each different bit, create detect msg & send to serial buffer
-; also flip state of bit in C
-
-; advance subpic # and return
-
-
-; NB for self, can skip i2c and just read straight from legs according to
-;  bitmask Ma-e
-
-; will need to use external routines for: i2c, serial_send
-
-
-
-
-;****************************************************************************
-; needs conditional for slave
-
-; SLAVE PIC
-; main loop of slave program
-
-; Reads from detection legs as defined by bitmasks Ma-e applied to ports a-e.
-; Writes the result into registers Pa-e. On i2c interrupt, checks that there
-; is new data to send to the master pic and if so sends it. Current state of
-; master's knowledge is stored in Ca-e for comparison with Pa-e.
-;
-; Associated registers etc.:
-; Pa-e		5 registers	data from detection legs
-; Ma-e		5 registers	bitmask defining detction legs
-; Ca-e		5 registers	current state of data held in master
-;				for this slave pic
-; ???		1 bit		'something to send' y/n
-; ???		?  bits		'currently reading from port' 1-5 (=a-e)
-
-; disable interrupts
-
-; read data from detection legs associated with current port
-
-; invert bits; OR with Pn; AND with Mn; store in Pn
-
-; compare Pn and Cn; if different, set 'something to send'
-
-; enable interrupts
-
-; advance port #
-
-; on i2c interrupt:
-; check 'something to send'
-; if=0, send 'no change' (precise message = ?)
-; if=1, clear 'something to send'; copy Pa-e -> Ca-e; blank Pa-e; write Ca-e
-; to i2c output buffer; start sending (check whether this will be sent
-; automatically or whether I will need to pay it attention);
-; return
-
-; will need to use external i2c send function/buffers, maybe?