;***************************************************************************
; 
; File Name		:'DS1602.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
;
;Handlers for Dallas DS1602 RTC chip on port A4,5,6
;
; DEFINITIONS
;
; 
;***************************************************************************;
;	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	97.07.21  dvh	Creation
;	0.02	97.09.22  dvh	Created skeleton
;	0.03	97.10.13  dvh	coding for DS1602
;	0.04	97.10.16  dvh	Coded all commands and conversations
;	0.05	97.10.21  dvh	Tested most functions OK
;	0.06	97.10.22  dvh	Debugged data output from RTC
;
;Routine	Input		Output
;
;Get_Rtime	None		TIME_Buf	;WORKING
;Get_Etime	None		Time_Buf	;WORKING
;Put_Rtime	Time_Buf	None		;
;Put_Etime	Time_Buf	None		;
;Clear_Rtime	None		Timer cleared	;WORKING
;Clear_Etime	None		Timer cleared	;WORKING
;Set_Time_Trim	Temp		None		;00ABC000
;********************************************************************
;I/O is coded to port A, bits 4,5,6 change this in the last routines, 
;below WRITE_RTC_BUF
;Requires an 8 byte buffer in memory, located at RTC_BUF
;********************************************************************
;This clock chip counts seconds from powerup, or you can load the seconds
;counter to any value and continue counting upward. This makes a unix-like
;clock very easy to implement. There are two counters, one can be set to 
;some start time, and the other can be reset at powerup, or used for other
;purposes.
;********************************************************************
;Get the time buffer out of the RTC.
;
GET_RTIME:	;Takes Binary from clock, loads to RTC_BUF

	push	TEMP

	rcall	Open_Clock	;
	ldi	TEMP,$81	;RTC command, Read Continuous counter
	rcall	PUT_RTC_BYTE	;
	rcall	Read_RTC_Buf	;reads into the FIRST four bytes of RTC_BUF
	rcall	Close_Clock	;

	pop	TEMP
	ret

;********************************
;
;Put the time buffer into the RTC
;
PUT_RTIME:	;Takes binary data from RTC_BUF 

	push	TEMP

	rcall	Open_Clock	;
	ldi	TEMP,$80	;RTC command
	rcall	PUT_RTC_BYTE	;
	rcall	Write_RTC_Buf	;
	rcall	Close_Clock	;

	pop	TEMP
	ret
;
;Get the time buffer out of the RTC.
;
GET_ETIME:	;Takes Binary from clock, loads to RTC_BUF

	push	TEMP

	rcall	Open_Clock	;
	ldi	TEMP,$41	;RTC command
	rcall	PUT_RTC_BYTE	;
	rcall	Read_RTC_Buf2	;Reads into the LAST 4 bytes of RTC_BUF
	rcall	Close_Clock	;

	pop	TEMP
	ret

;********************************
;
;Put the time buffer into the RTC
;
PUT_ETIME:	;Takes binary data from RTC_BUF 

	push	TEMP

	rcall	Open_Clock
	ldi	TEMP,$40	;RTC command, Write VCC Active counter
	rcall	PUT_RTC_BYTE	;
	rcall	Write_RTC_Buf	;
	rcall	Close_Clock	;

	pop	TEMP
	ret
;
;
;
Clear_ETIME:	;Nukes elapsed time counter (Powerup)

	push	TEMP
	
	rcall	Open_Clock	;
	ldi	TEMP,$02	;RTC command, Clear VCC Active counter
	rcall	PUT_RTC_BYTE	;
	rcall	Close_Clock

	pop	TEMP
	ret
;
;
;
Clear_RTIME:	;Nukes Realtime time counter (Powerup)

	push	TEMP

	rcall	Open_Clock	;
	ldi	TEMP,$04	;RTC command, Clear Continuous counter
	rcall	PUT_RTC_BYTE	;
	rcall	Close_Clock	;

	pop	TEMP
	ret
;
;
;
Set_TIME_Trim:

	;Input bits in position in TEMP
	push	TEMP

	rcall	Open_Clock	;
	pop	TEMP		;
	ori	TEMP,$C0	;
	andi	TEMP,$F8	;
	rcall	PUT_RTC_BYTE	;
	rcall	Close_Clock	;

	pop	TEMP		;
	ret




;**********************************
;
;A pair of nearly identical buffer read 
;and write routines
;
Read_RTC_BUF:
	rcall	GET_RTC_Byte
	sts	(RTC_BUF+0),TEMP
	rcall	GET_RTC_Byte
	sts	(RTC_BUF+1),TEMP
	rcall	GET_RTC_Byte
	sts	(RTC_BUF+2),TEMP
	rcall	GET_RTC_Byte
	sts	(RTC_BUF+3),TEMP
	ret

Read_RTC_BUF2:
	rcall	GET_RTC_Byte
	sts	(RTC_BUF+4),TEMP
	rcall	GET_RTC_Byte
	sts	(RTC_BUF+5),TEMP
	rcall	GET_RTC_Byte
	sts	(RTC_BUF+6),TEMP
	rcall	GET_RTC_Byte
	sts	(RTC_BUF+7),TEMP
	ret

Write_RTC_BUF:
	lds	TEMP,(RTC_BUF+0)
	rcall	Put_RTC_Byte
	lds	TEMP,(RTC_BUF+1)
	rcall	Put_RTC_Byte
	lds	TEMP,(RTC_BUF+2)
	rcall	Put_RTC_Byte
	lds	TEMP,(RTC_BUF+3)
	rcall	Put_RTC_Byte
	ret
;********************************
;
;Move a nybble out of the RTC.
;Output in TEMP
;
GET_RTC_Byte:
	push	LOOP		;
	rcall	GET_RTC_BIT	;
	rcall	GET_RTC_BIT	;
	rcall	GET_RTC_BIT	;
	rcall	GET_RTC_BIT	;
	rcall	GET_RTC_BIT	;
	rcall	GET_RTC_BIT	;
	rcall	GET_RTC_BIT	;
	rcall	GET_RTC_BIT	;
	cbi	PORTA,6		;
	sbi	PORTA,5		;Make sure data always goes high on exit (OC!)
	pop	LOOP		;
	ret			;
;

;
;Move a byte out to the RTC.
;Input in Temp
;
Put_RTC_Byte:
	push	LOOP		;
	rcall	PUT_RTC_BIT	;
	rcall	PUT_RTC_BIT	;
	rcall	PUT_RTC_BIT	;
	rcall	PUT_RTC_BIT	;
	rcall	PUT_RTC_BIT	;
	rcall	PUT_RTC_BIT	;
	rcall	PUT_RTC_BIT	;
	rcall	PUT_RTC_BIT	;
	cbi	PORTA,6		;
	sbi	PORTA,5		;Make sure data always goes high on exit (OC!)
				;Exits with data high, and clock low
	pop	LOOP		;
	ret			;
;
;**********************************
;
;Lowest level, what it takes to clock a bit
;I/O in TEMP
;
;PA6	RTC Clock
;PA5	RTC Data
;PA4	RTC /RESET
;
;
;
GET_RTC_BIT:
	sbi	PORTA,5		;Set for read (Open collector)
	sbi	PORTA,6		;
	in	LOOP,PINA	;Read data into LOOP from PINA (bit 5)
	rol	Loop		;5-6
	rol	Loop		;6-7
	rol	Loop		;7-C
	ror	TEMP		;C-7 Puts into msb, first bit ends up as lsb
	cbi	PORTA,6		;Set clock low(next data is now ready)
	ret
;
;
;
Put_RTC_BIT:
	ror	TEMP		;LSB First
	brcs	P_RTC_One	;

P_RTC_Zero:
	cbi	PORTA,5		;Make data bit zero
	rjmp	P_RTC_Clock	;

P_RTC_One:
	sbi	PORTA,5		;Make data bit one
		
P_RTC_Clock:
	sbi	PORTA,6		;Clock 1
	cbi	PORTA,6		;Clock 0
	ret
;
;
;
Open_Clock:
	cbi	PORTA,6		;Take clock low
	sbi	PORTA,4		;Take /reset high
	ret
;
;
;
Close_Clock:
	sbi	PORTA,6		;Take clock high(jic), see appnote
	cbi	PORTA,4		;Take /reset low, NEVER while clock is low
	ret
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