; OSTC - diving computer code

; Copyright (C) 2008 HeinrichsWeikamp GbR



;    This program is free software: you can redistribute it and/or modify

;    it under the terms of the GNU General Public License as published by

;    the Free Software Foundation, either version 3 of the License, or

;    (at your option) any later version.



;    This program is distributed in the hope that it will be useful,

;    but WITHOUT ANY WARRANTY; without even the implied warranty of

;    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

;    GNU General Public License for more details.



;    You should have received a copy of the GNU General Public License

;    along with this program.  If not, see <http://www.gnu.org/licenses/>.





; Syncs RTC with PC

; written by: Matthias Heinrichs, info@heinrichsweikamp.com

; written: 13/10/07

; last updated: 08/08/31

; known bugs:

; ToDo: 



; routine echoes the "b" command as ready signal

; PC has to send 6 bytes

; Byte1: hours

; Byte2: minutes

; Byte3: seconds

; Byte4: month

; Byte5: day

; Byte6: year

; All bytes will be checked for plausibility and the clock will be set

; after a timeout of about 20ms, the routine ends



sync_clock:

	bcf		uart_settime				; clear flag

	bcf		PIE1,RCIE					; no interrupt for UART

	call	set_LEDusb			; LEDusb ON

	bcf		PIR1,RCIF					; clear flag



	movlw	"b"							; send echo

	movwf	TXREG						

	call	rs232_wait_tx					; wait for UART

	

	call	rs232_get_byte					; hours

	movff	RCREG, hours



	movlw	d'24'

	cpfslt	hours

	clrf	hours



	call	rs232_get_byte					; minutes

	movff	RCREG, mins



	movlw	d'60'

	cpfslt	mins

	clrf	mins



	call	rs232_get_byte					; seconds

	movff	RCREG, secs



	movlw	d'60'

	cpfslt	secs

	clrf	secs



	call	rs232_get_byte					; month

	movff	RCREG, month



	movlw	d'12'

	cpfsgt	month

	bra	sync_clock0

	movwf	month					



sync_clock0:

	call	rs232_get_byte					; day

	movff	RCREG, day



	movff	month,lo		; new month

	dcfsnz	lo,F

	movlw	.31

	dcfsnz	lo,F

	movlw	.28

	dcfsnz	lo,F

	movlw	.31

	dcfsnz	lo,F

	movlw	.30

	dcfsnz	lo,F

	movlw	.31

	dcfsnz	lo,F

	movlw	.30

	dcfsnz	lo,F

	movlw	.31

	dcfsnz	lo,F

	movlw	.31

	dcfsnz	lo,F

	movlw	.30

	dcfsnz	lo,F

	movlw	.31

	dcfsnz	lo,F

	movlw	.30

	dcfsnz	lo,F

	movlw	.31

	cpfsgt	day						; day ok?

	bra	sync_clock1				; OK

	movlw	.1						; not OK, set to 1st

	movwf	day



sync_clock1:

	call	rs232_get_byte					; year

	movff	RCREG, year



	movlw	d'100'

	cpfslt	year

	clrf	year



	call	clear_LEDusb				; LEDusb OFF

	bcf		PIR1,RCIF					; clear flag

	bsf		oneminupdate				; set flag, so new time and date will be updated in surfacemode at once

	bsf		PIE1,RCIE					; enable interrupt for UART

	goto	surfloop_loop					; return to surface loop