***************************************************************************
; 
; File Name		:'DS1820.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
;
; DEFINITIONS
;
;	TEMP_BUF	Temp sensor bytes end up in here
;
; 
;***************************************************************************;
;	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	98.09.28  dvh	Creation  A basic handler for the DS182 connected
;				on port A7 (near end of code)
;
;******************************************************************************
;
;Uses a 9 byte buffer at TEMP_BUF, and a byte flag "TEMP_FLAG"
;
;Ram Data:
;Byte 	0	Temp LSB	First byte transmitted
;	1	Temp MSB	
;	2	TH/User 1
;	3	TH/User 2
;	4	Res
;	5	Res
;	6	Count remain
;	7	Count per Deg C.
;	8	CRC		Last byte transmitted
;
;
;****************************************************************
Update_Temp:
	rcall	Start_Temp		;Start if needed,
	rcall	Poll_Temp		;check if done
	rcall	Get_Temp		;If done, then get the data
;
;
;Gets all 9 bytes of temp
;
;Flag:  $FF Conversion started
;	$01 Conversion Done
;	$00 Not in use
;
Start_TEMP:
	lds	TEMP,TEMP_FLAG	;Already converting?
	and	TEMP,TEMP	;
	brne	Start_Temp_Done	;Yes, just exit

	rcall	Reset_1820	;Reset the chip
	rcall	Skip_Rom	;Skip rom ID
	rcall	Convert_T	;Start temp conversion
	ldi	TEMP,$FF	;
	sts	TEMP_FLAG,TEMP	;Flag conversion started

Start_Temp_Done:
	ret

Poll_Temp:
	lds	TEMP,TEMP_FLAG	;
	inc	TEMP		;
	brne	Poll_Temp_Done
	rcall	Check_Temp	;Poll till not busy
	;Sets flag to $01 if temp convert is done
Poll_Temp_Done:
	ret

Get_Temp:
	lds	TEMP,TEMP_FLAG	;Ready to get?
	dec	TEMP		;
	brne	Get_Temp_Done	;Nope, just bail

	rcall	Reset_1820	;Reset the chip again
	rcall	Skip_Rom	;Skip rom ID
	rcall	Read_Scratchpad	;read the data into TEMP_BUF
	rcall	Reset_1820	;Reset it again
	ldi	TEMP,$00	;
	sts	TEMP_FLAG,TEMP	;Signal done
Get_Temp_Done:
	ret			;

;
;Gets 8 bytes from rom, device ID, serno and CRC
GET_SERNO:
	rcall	Reset_1820	;Reset the chip
	rcall	Read_Rom	;Get rom data into Temp_Buf
	rcall	Reset_1820	;Reset it again
	ret

;
;This routine verifies the presence of a Dallas 1820 chip
;It can't be fooled by hung hi or hung lo lines.
;
RESET_1820:
	push	TEMP		;Save it
	cbi	PORTA,7		;Go tri-state
	sbi	DDRA,7		;Make this pin drive low

;
;
;This should be a 1Ms Delay
;
	ldi	TEMP,$0C	;
RST_A:	ldi	TEMP2,220	;Calculated for 8 mhz xtal
	mov	LOOP,TEMP2
RST_B:	dec	LOOP		;1 FF*2+
	brne	RST_B		;1 0F*3
	dec	TEMP		;1
	brne	RST_A		;1

	;At this point, at least 1mS has passed, maybe up to 2ms.
	cli			;***Shut off ints
	sbi	PORTA,7		;Drive high
	cbi	DDRA,7		;then go O/C again

	;At this point, the I/O goes high, for a min of 15 and max of 60uS

	ldi	TEMP,5		;5*3=15!
RST_BB:	dec	TEMP		;
	rcall	Three_uS	;
	brne	RST_BB		;

	in	TEMP,PINA	;Check that the temp sensor
	andi	TEMP,$80	;output actually went high
	breq	RST1820_BAD	;

	;Then goes low for a min of 60 and a max of 240uS
	;Sampling must then occur not sooner 61uS or later than 75

RST1820_C:
	ldi	TEMP,20		;20*3=60
RST_C:	dec	temp		;
	rcall	Three_uS	;
	brne	RST_C		;

	;Make sure that the device is present by sensing a low state 
	;at this point in the transaction
	in	TEMP,PINA	;
	andi	TEMP,$80	;
	brne	RST1820_BAD	;If it's high at this point, there's no sensor

	SEI	;***Restore ints!

	ldi	TEMP2,10	;
	mov	LOOP,TEMP2	;
RST_D:	dec	LOOP		;
	rcall	Three_uS	;
	breq	RST1820_BAD	;If it never goes high, it's still cat-food

	ldi	TEMP,7		;Wait before checking
RST_DA:	dec	TEMP		;
	rcall	Three_uS	;
	brne	RST_DA		;
	in	TEMP,PINA	;
	andi	TEMP,$80	;
	breq	RST_D		;

RST1820_OK:
	ldi	TEMP,$00	;
	sts	TEMP_STAT,TEMP	;Signal that the sensor is OK	
	rjmp	RST_1820_DONE

RST1820_BAD:
	sei			;JIC
	ldi	TEMP,$FF	;
	sts	TEMP_STAT,TEMP	;Show what part of the conversation we are objecting to

RST_1820_DONE:
	pop	TEMP		;
	ret
;

;
;Gets serno, Family code, CRC (Only one device on bus!)
;*** Working!
Read_Rom:
	push	TEMP
	ldi	TEMP,$33
	mov	TEMP2,TEMP
	rcall	Write_Byte

	rcall	read_byte		;Get Family code
	sts	(SERNO_BUF+0),TEMP2
	rcall	read_byte		;Get Serno lsb
	sts	(SERNO_BUF+1),TEMP2
	rcall	read_byte		;Get Serno
	sts	(SERNO_BUF+2),TEMP2
	rcall	read_byte		;Get Serno
	sts	(SERNO_BUF+3),TEMP2
	rcall	read_byte		;Get Serno
	sts	(SERNO_BUF+4),TEMP2
	rcall	read_byte		;Get Serno
	sts	(SERNO_BUF+5),TEMP2
	rcall	read_byte		;Get Serno MSB
	sts	(SERNO_BUF+6),TEMP2
	rcall	read_byte		;Get CRC
	sts	(SERNO_BUF+7),TEMP2
	pop	TEMP
	ret
;
;Address a single device (takes a 64 bit ROM number)
;
Match_Rom:
	push	TEMP
	;Not implemented.
	pop	TEMP
	ret
;
;Read rom W/O serno, single device only
;
Skip_Rom:
	ldi	TEMP,$CC
	mov	TEMP2,TEMP
	rcall	Write_Byte
	ret

;
;Scan for devices
;
Search_Rom:
	push	TEMP
	;Not implemented
	pop	TEMP
	ret
;
;Same as search rom, but they only respond if the temp
;has been exceeded (internal alarms)
;
Alarm_Search:
	push	TEMP
	;Not implemented
	pop	TEMP
	ret

;Starts the conversion process
;May take up to .5 sec
;Polling the device returns a zero until it is ready
;
Convert_T:
	;Send $44 as protocol
	ldi	TEMP,$44
	mov	TEMP2,TEMP
	rcall	Write_Byte
	ret


Check_Temp:
	clr	TEMP2
	rcall	READ_BIT	;
	and	TEMP2,TEMP2	;Is there a one?
	breq	Check_TEMP_Done	;No, leave it alone
	ldi	TEMP,$01	;
	mov	TEMP2,TEMP	;
	sts	TEMP_FLAG,TEMP2	;Flag conversion done
Check_Temp_Done:
	ret


Read_Scratchpad:
	;Send $BE as protocol
	ldi	TEMP,$BE
	mov	TEMP2,TEMP
	rcall	Write_Byte

	rcall	read_byte
	sts	(TEMP_BUF+0),TEMP2	;Always pull in all the data!
	rcall	read_byte
	sts	(TEMP_BUF+1),TEMP2
	rcall	read_byte
	sts	(TEMP_BUF+2),TEMP2
	rcall	read_byte
	sts	(TEMP_BUF+3),TEMP2
	rcall	read_byte
	sts	(TEMP_BUF+4),TEMP2
	rcall	read_byte
	sts	(TEMP_BUF+5),TEMP2
	rcall	read_byte
	sts	(TEMP_BUF+6),TEMP2
	rcall	read_byte
	sts	(TEMP_BUF+7),TEMP2
	rcall	read_byte
	sts	(TEMP_BUF+8),TEMP2

	ret

;
;Assumes byte in TEMP2
;
Write_Byte:
	push	LOOP
	ldi	TEMP,8
	mov	LOOP,TEMP

WB_A:	ror	TEMP2	;LSB to carry
	brcs	W_one

W_Zero:	rcall	Write_0_Bit
	rjmp	W_Done

W_One:	rcall	Write_1_Bit
	rjmp	W_Done

W_Done:	
	dec	LOOP
	brne	WB_A

	pop	LOOP
	ret
;
;Get a byte from the temp sensor
;
Read_Byte:
	push	LOOP		;
	ldi	TEMP2,8		;
	mov	LOOP,TEMP2
R_B_A:	rcall	Read_Bit	;
	dec	Loop		;
	brne	R_B_A		;
	pop	loop		;
	ret

;
;Get a single bit, as fast as possible
;1/15/98 updated for true O/C operation
;
Read_BIT:
	cbi	PORTA,7		;Tri-state
	sbi	DDRA,7		;Make it low
	rcall	Three_uS	;Wait
	sbi	PORTA,7		;Set Output High
	cbi	DDRA,7		;Back to O/C

	ldi	TEMP,4		;15uS timewaster
RB_A:	dec	TEMP		;
	rcall	Three_uS	;
	brne	RB_A		;

	in	TEMP,PINA	;Read the bit
	rol	TEMP		;Put it in the Carry
	ror	TEMP2		;Store it in TEMP2(Register)


RB_B:
	rcall	Three_uS	
	in	TEMP,PINA	;
	andi	TEMP,$80	;
	breq	RB_B		;Wait till it goes high
	ret

WRITE_0_BIT:
	cbi	PORTA,7		;Tri-state
	sbi	DDRA,7		;Force low
	rcall	Seventy_uS	;
	sbi	PORTA,7		;Force high
	cbi	DDRA,7		;O/C high
	rcall	Three_uS	;
	ret

WRITE_1_BIT:
	cbi	PORTA,7		;
	sbi	DDRA,7		;
	rcall	Three_uS	;
	sbi	PORTA,7		;
	cbi	DDRA,7		;
	rcall	Seventy_uS	;
	RET			;


;
;Hand-tweaked time delays, Check using PortB,7
;
;
;
Seventy_uS:
	push	LOOP		;
	ldi	TEMP2,16	;16 call and returns takes 70uS (Go figure)
	mov	LOOP,TEMP2	;

WR_1_L:	dec	loop		;
	rcall	Three_uS	;
	brne	WR_1_L		;
	pop	Loop		;
	ret

Three_US:
	nop			;24 nops @ 8 Mhz, + call and return overhead,
	nop			;=3uS
	nop			;
	nop			;
	nop			;
	nop			;
	nop			;
	nop			;
	nop			;
	nop			;
	nop			;
	nop			;
	nop			;
	nop			;
	nop			;
	nop			;
	nop			;
	nop			;
	nop			;
	nop			;
	nop			;
	nop			;
	nop			;
	nop			;
	ret
	
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    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>