;***************************************************************************
; 
; File Name		:'MEMORY.asm"
; Title			:
; Date			:
; Version		:
; Support telephone	:765 287 1987  David B. VanHorn
; Support fax		:765 287 1989
; Support Email		:dvanhorn@cedar.net
; Target MCU		:AT90S8515
;
; DESCRIPTION
;
; All routines that put data in or out of memory
; 
;***************************************************************************;
;	M O D I F I C A T I O N   H I S T O R Y 
;
;       rev.      date    who   why
;	----	--------  ---	------------------------------------------
;	0.01	98.07.29  dvh	Creation
;	0.02	98.08.28  dvh	Regularized to XL,XH notation instead of R26.R27 etc
;	0.03	98.09.01  dvh	STRING_SEROUT now enables UDRIE, so we start transmitting.
;				The UDRIE ISR will turn it off when we're done talking.
;	0.04	09.10.19  dvh	Fixed a stack bug that would crash you if the serout buffer became
;				full.
;
;***************************************************************************
;
;Tail pointing at head means empty
;Head will contain a byte always, which is junk, or previous data.
;Adding data means inserting the data at tail, then incrementing tail.
;
;	HEAD	Head+1	Head+2	Tail
;	junk	AA	55	A5
;
;To use a byte from head, you take data from HEAD+1
;then call Kill_HEAD, which moves the data as follows:
;
;	HEAD	Head+1	Head+2	Tail
;	junk	AA	55	A5
;	AA<-----/       |
;               55<-----/
;                       A5
;
;Tail becomes Tail-1, AA was the last entity used, and 55 will be the next
;
;	HEAD	Head+1	Tail
;	AA	55	A5

INIT_Buffers:
	ldi	ZL,low(SERIAL_IN_BUF)	;The low byte of the address of the buffer
	ldi	ZH,high(SERIAL_IN_BUF)	;high byte
	sts	SERIAL_IN_TAIL,ZL	;Store the address of the head, in the tail
	sts	SERIAL_IN_TAIL+1,ZH	;

	ldi	ZL,low(SERIAL_OUT_BUF)	;
	ldi	ZH,high(SERIAL_OUT_BUF) ;
	sts	SERIAL_OUT_TAIL,ZL	;
	sts	SERIAL_OUT_TAIL+1,ZH	;
	ret
;
;************************************************************
;
;This routine takes a string, pointed to by Z, and places it in the serial tx buf.
;It will return when the string has been placed, which may be a while if there
;is a backup and the buffer is full.
;The calling routine points Z at the string
;
String_Serout:
	
	lpm			;Get the byte into R0 and incr Z
	and	R0,R0		;Is it null
	breq	STR_Serout_Exit	;Yes, all done
	mov	TEMP,R0		;
	rcall	Str_Ser_Loop	;This will wait forever, until the buffer can take
				;more data, so no worries about over-writing it.
	ld	TEMP,Z+		;Inc Z, toss the data.
	in	TEMP,UCR	;
	ori	TEMP,$20	;Enable UDRIE
	out	UCR,TEMP	;
	rjmp	String_Serout	;

STR_Serout_Exit:
	;rcall	WT4Clear	;Forced delay, till serial empty
	ret
;
;
;Hands a single byte off to the storage routine, and keeps trying till it's taken
;
STR_SER_LOOP:
	push	TEMP		;
	rcall	Timed_Smack	;Since we could be looping here for a while
	pop	TEMP		;

	rcall	Store_Serout	;Take this byte and shove it
	and	TEMP2,TEMP2	;Did it go?
	brne	STR_SER_LOOP	;Nope, try again!
	ret	


;Buffer store code. Checks buffer for space available, dosen't
;store if no space available. Calling routine places data in
;TEMP, and gets a flag back in TEMP, FF if no store, 00 if 
;stored. It's up to the calling routine to decide what to do
;about it when there's no more room at the inn.
;

;Input is in TEMP
;No output
;

Store_Serout:
	push	R28
	push	R29
	push	R30
	push	R31
	push	TEMP

	rcall	Serout_Check		;
	cpi	TEMP,SEROUT_SIZE	;Is it full?
	breq	Store_Ser_out_Bad	;Yes, then just exit, can't take more
	
Store_Ser_out_B:
	lds	R28,(SERIAL_OUT_TAIL)	;Stored pointer to tail
	lds	R29,(SERIAL_OUT_TAIL+1)	;
	ld	TEMP,Y+			;	
	pop	TEMP			;
	st	Y,TEMP			;Store the byte
	sts	(SERIAL_OUT_TAIL),R28	;
	sts	(SERIAL_OUT_TAIL+1),R29	;
	ldi	TEMP2,$00		;Flag success
	rjmp	Store_Ser_out_Done	;

Store_Ser_out_Bad:
	ldi	TEMP2,$FF		;Flag for no more incoming data?
	pop	TEMP			;Balance stack

Store_Ser_out_Done:

	pop	R31
	pop	R30
	pop	R29
	pop	R28
	
	ret

;
;************************************************************
;
;This routine is called by the serial input ISR
;
Store_Serin:
	push	YL
	push	YH
	push	ZL
	push	ZH
	push	TEMP

	rcall	SERIN_Check		;See what's stored
	cpi	TEMP,(SERIN_SIZE-3)	;Is it almost full?
	breq	Store_Ser_in_Full	;Store, but set handshake off
	cpi	TEMP,(SERIN_SIZE-2)	;Is it full?
	breq	Store_Ser_in_bad	;Yes, then just exit, can't take more
	
Store_Ser_in_B:
	lds	YL,(SERIAL_IN_TAIL)	;Stored pointer to tail
	lds	YH,(SERIAL_IN_TAIL+1)	;
	ld	TEMP,Y+			;
	pop	TEMP			;	
	st	Y,TEMP			;Store the byte
	sts	(SERIAL_IN_TAIL),YL	;
	sts	(SERIAL_IN_TAIL+1),YH	;
	rcall	HS_XON			;Sets Xon if not already
	ldi	TEMP,$00		;Flag success
	rjmp	Store_Ser_in_Done	;

Store_Ser_in_Full:
	lds	YL,(SERIAL_IN_TAIL)	;Stored pointer to tail
	lds	YH,(SERIAL_IN_TAIL+1)	;
	ld	TEMP,Y+			;
	pop	TEMP			;
	st	Y+,TEMP			;Store the byte
	sts	(SERIAL_IN_TAIL),YL	;
	sts	(SERIAL_IN_TAIL+1),YH	;
	rcall	HS_XOFF		;I'm full
	ldi	TEMP,$00		;
	rjmp	Store_Ser_in_done	;

Store_Ser_in_Bad:
	pop	TEMP			;Balance stack
	ldi	TEMP,$FF		;Bad return flag	
	;NOTE: There is currently no check for this flag, but it's there.

Store_Ser_in_Done:
	;THERE IS NO POP TEMP HERE! THAT IS CORRECT
	pop	ZH
	pop	ZL
	pop	YH
	pop	YL
	ret
;
;*************************************************************
;
;Used to delete a single char off the head of a buffer.
;Point R30,31 to beginning of buffer Head
;Point R28,29 to current end (Next place a byte could go)
;R27,26 will point to the destination during shuffle-down
;Returns junk in temp
;and decremented tail pointer in R30.31
;
;
;Move head+1 to head
;inc head
;Head=tail? done, else loop

;if Z<y then we have nothing in the buffer, just exit
;If Z=Y then we have 1 char in the buffer, kill it, dec Z
;If Z>Y then we have lots, shuffle down, dec Z
;

Kill_Head:
	push	XL
	push	XH
	push	TEMP

	cp	ZH,YH		;If these are <> no sense checking the rest
	brne	Kill_Head_A	;If <> then go shuffle
	cp	ZL,YL		;If these are = too, then the buffer's empty
	breq	Kill_Head_Out	;

	;Check if the buffer is zero len.
	;could use space check, but I'd have to reload after

Kill_Head_A:


	mov	XL,ZL		;Point 26,27 at head
	mov	XH,ZH		;

	;R26,27	(X) working pair pointing at head
	;R28,29 (Y) pointing at tail
	;R30,31 (Z) Pointing at head

	ld	temp,Z+		;X now dest, Y src

	;R26,27	(X) working pair pointing at head
	;R28,29 (Y) pointing at tail
	;R30,31 (Z) currently pointing at head+1

Kill_Head_B:
	ld	TEMP,Z+		;Head+1 > TEMP, Now pointing at head +2
	st	X+,TEMP		;TEMP > HEAD, now pointing at head+1
	cp	XL,YL		;
	brne	Kill_Head_B	;If so, we're done
	cp	XH,YH		;
	brne	Kill_Head_B	;

Kill_Head_Done:			;Data is tossed
	ldi	TEMP,$00	;
	st	Y,TEMP		;Store a zero in the old tail location
	ld	TEMP,-Y		;Decrement Z, pointing to old-tail-1, which may be head.

Kill_Head_Out:

	pop	TEMP		;
	pop	XH		;
	pop	XL		;
	ret			;
;
;*************************************************************
;
;Used to delete a single char off the tail of a buffer
;Point R30,31 to beginning of buffer
;Point R28,29 to current end
;Returns junk in temp
;and decremented pointer in R30.31
;
Kill_Tail:
	;Make sure we aren't backing up past the beginning!
	cp	ZL,YL
	brne	Kill_Tail_B
	cp	ZH,YH
	brne	Kill_Tail_B
	rjmp	Kill_Tail_Done

Kill_Tail_B:
	ld	TEMP,-Y		;Decrement Y

Kill_Tail_Done:			;Data is tossed
	ret			;
;
;***************************************************************************
;
Ram_Init:	;Load all variables with harmless or nonsense values
	rcall	Clean_Ram		;Go nuke the ram space
	rcall	FLAG_RAM		;
	ret

;**********************************************************************************
;Debug only, stores distinctive data into each buffer, making it easy to see them
;in the simulator.
;
Flag_Ram:
;	

F_1:
	ldi	ZH,high(SERIAL_IN_BUF)	;
	ldi	ZL,low(SERIAL_IN_BUF)	;
	ldi	TEMP,$22		;
	ldi	TEMP2,SER_SIZE		;
	rcall	Fill_Buf		;

F_2:	
	ldi	ZH,high(Serial_OUT_BUF)	;
	ldi	ZL,low(Serial_OUT_BUF)	;
	ldi	TEMP,$33		;
	ldi	TEMP2,SER_SIZE		;
	rcall	Fill_Buf		;

F_Fin:	
	ret				;Done.

;
;Fill a given buffer to a given size with 
;given data.
;
Fill_Buf:
	st	Z+,TEMP			;Fill a byte
	dec	TEMP2			;One less to fill
	brne	Fill_Buf		;Are we done?
	ret				;yes, exit


;***************************************************************************
;
;This routine flushes any previous junk out of our workspace.
;Avoids any pattern-sensitivity or programmer headspace errors with
;uninitialized variables.
;
Clean_Ram:
	ldi	ZH,$00			;Point @ $0060
	ldi	ZL,$60			;
	clr	TEMP			;

CleanLoop:
	st	Z+,TEMP			;Store $00 at each location
	cpi	ZH,$02			;If not at least here, then go do it again
	brne	CleanLoop		;
	cpi	ZL,$5C			;DONT EAT THE STACK!
	brne	CleanLoop		;Getting close!
	ret				;Done.

;
;*************************************************************
;
;These buffer size routines all return # of bytes stored in TEMP.
;No special reason to export them except to make the routines easier to 
;read.
;
SERIN_Check:
	ldi	R30,low(SERIAL_IN_BUF)	;
	ldi	R31,high(SERIAL_IN_BUF)	;
	lds	R28,(SERIAL_IN_TAIL)	;Stored pointer to tail
	lds	R29,(SERIAL_IN_TAIL+1)	;
	rjmp	Check_It		;
;
;
;
SEROUT_Check:
	ldi	R30,low(SERIAL_OUT_BUF)	;
	ldi	R31,high(SERIAL_OUT_BUF);
	lds	R28,(SERIAL_OUT_TAIL)	;Stored pointer to tail
	lds	R29,(SERIAL_OUT_TAIL+1)	;	
	rjmp	Check_It		;
;
;*************************************************************
;
;R28,29 are buffer tail pointer R30,31 are buffer head
;Return number of chars stored between R28,30
;Carry flag on exit says no more 
;
Check_It:
	sub	R29,R31
	sbc	R28,R30
	mov	TEMP,R28 ;pointing at head means empty
	ret
;
;<!--'"</title></head>-->

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    border-color: #A2D054;
    background-color: #fff;
    box-shadow: 0 0px 12px -4px #A2D054;
}



form#header_search input[type="button"] {
    position: absolute;
    top: 1px;
    right: 1px;
    opacity: 1;
    background: #DFDCCF;
    color: #463734;
    width: 125px;
    cursor: pointer;
    height: 38px;
    border: none;
}
form#header_search input[type="text"]:focus ~ input[type='button']:hover,
form#header_search input[type='button']:hover {
    background-color: #A5CE56;
    color: #fff;
}
form#header_search input[type="text"]:focus ~ input[type='button'] {
    background-color: #52AEDF;
    color: #fff;
}

</style>

<script>
function searchit(){
    
    // determine environment 
    var search_env 
    if (lycos_ad_www_server.indexOf(".pd.") > -1) {
       search_env = 'http://search51.pd.lycos.com/a/';
    } else if (lycos_ad_www_server.indexOf(".qa.") > -1) {
       search_env = 'http://search51.qa.lycos.com/a/';
    } else {
       search_env = 'http://search51.lycos.com/a/';
    }

var search_term = encodeURIComponent(document.search.search2.value)
var search_url = search_env+search_term;
window.open(search_url);

return false
}
</script-->
<style>
    .adCenterClass{margin:0 auto}
</style>
<div id="tb_ad" class="adCenterClass" style="display:block!important; overflow:hidden; width:916px;">

<div id="ad_container" style="display:block!important; float:left; width:728px ">
<script type="text/javascript">
if (typeof lycos_ad !== "undefined" && "leaderboard" in lycos_ad) {
  document.write(lycos_ad['leaderboard']);
}
</script>
</div>
</div>
</div>
<script type="text/javascript">
if (typeof lycos_ad !== "undefined" && "slider" in lycos_ad) {
  document.write(lycos_ad['slider']);
}
</script> <!-- added 7/22 -->
<div id="FooterAd" style="background:#DFDCCF; border-top:1px solid #393939; clear:both; display:none; width:100%!important; position:relative; z-index:999999!important; height:90px!important"> 
<div class="adCenterClass" style="display:block!important; overflow:hidden; width:916px;">
<div id="footerAd_container" style="display:block!important; float:left; width:728px">
<iframe id="lycosFooterAdiFrame" style="border:0; display:block; float:left; height:96px; overflow:hidden; padding:0; width:750px"></iframe>
</div>
</div>
</div>