; Source created with Parsic Version 3.x

; at              : 2008.03.27. 19:23:52


; Project File    : C:\PROGRA~1\Parsic\628_9r4.PIC

; Project Version : 1.0.8

; Created         : 2008.03.01. 20:14:00

; Last change     : 2008.03.27. 19:16:36

	PROCESSOR 16F628

	INCLUDE P16F628.INC

	RADIX DEC


	__IDLOCS H'0100'

	__CONFIG _CP_OFF & _PWRTE_ON & _WDT_OFF & _BODEN_ON & _XT_OSC & _LVP_OFF & _MCLRE_OFF

; Diverses

ZERO	EQU Z	; ZERO-Flag
CARRY	 EQU C	; CARRY-Flag


; Variable

UD1_FD	= 32	; located in Bank 0
S0	= 33	; located in Bank 0
UA1RSFLAG	= 34	; located in Bank 0
TR1	= 35	; located in Bank 0
TR1_HI	= 36	; located in Bank 0
OS1_FD	= 37	; located in Bank 0
ZV1	= 38	; located in Bank 0
ZV1_FD	= 39	; located in Bank 0
UA1OUTBUF	= 40	; located in Bank 0
UA1OUTBUF1	= 41	; located in Bank 0
UA1OUTBUF2	= 42	; located in Bank 0
UA1OUTBUF3	= 43	; located in Bank 0
RAM	= 44	; located in Bank 0
SYS_WSAV	= 112	; located in Bank 0, 1, 2, 3
SYS_SSAV	= 113	; located in Bank 0, 1, 2, 3
SYS_FSAV	= 114	; located in Bank 0, 1, 2, 3

	ERRORLEVEL -302	; disable warning (Bankswitching)
	ERRORLEVEL -306	; disable warning (Pageswitching)

;****************************************
;Programmanfang
;****************************************

	ORG 0

	CLRF STATUS	; switch to RAM-Bank 0
	GOTO SYS_INIT
	NOP
	NOP

;****************************************
;Interrupt-Adress
;****************************************

	MOVWF SYS_WSAV	; save register
	SWAPF STATUS,W
	CLRF STATUS	; bank 0
	MOVWF SYS_SSAV
	MOVFW FSR
	MOVWF SYS_FSAV


	BTFSS INTCON,T0IF	; TMR0 ?
	GOTO NOTMR0INT
	BCF INTCON,T0IF	; Interrupt quitieren

	BCF STATUS,RP0	; Bank 0
	BCF STATUS,RP1	; Bank 0
	INCFSZ TR1,F
	GOTO SYS_INT_LABEL_0
	INCF TR1_HI,F

SYS_INT_LABEL_0
NOTMR0INT

;***************************************************
; UART -> UA1
;***************************************************


;---------------------------------------------------------

UA1CHKTX
	BCF STATUS,RP0	; Bank 0
	BCF STATUS,RP1	; Bank 0
	BTFSS PIR1,TXIF	; send byte ?
	GOTO UA1ENDINT	; no

	MOVFW UA1OUTBUF+1	; all transmitted ? 
	BTFSC STATUS,ZERO
	GOTO UA1TXINT1

	ERRORLEVEL -312
	BANKISEL UA1OUTBUF	; FILE INDIREKT
	ERRORLEVEL +312

	MOVFW UA1OUTBUF	; pointer
	INCF UA1OUTBUF,F	; pointer+1
	MOVWF FSR
	MOVFW INDF	; data
	MOVWF TXREG	; Transmit Register

	DECF UA1OUTBUF+1,F	; length-1
	GOTO EXITINT	; that's all

UA1TXINT1
	BSF STATUS,RP0	; Bank 1
	BCF STATUS,RP1	; Bank 1
	BTFSS TXSTA,TRMT	; last byte transmitted ?
	GOTO EXITINT	; no

	BCF TXSTA,TXEN	; transmitter off

	BCF STATUS,RP0	; Bank 0
	BSF UA1RSFLAG,2	; ready
	GOTO EXITINT

UA1ENDINT

EXITINT

	MOVFW SYS_FSAV
	MOVWF FSR
	SWAPF SYS_SSAV,W	; Register zurück
	MOVWF STATUS
	SWAPF SYS_WSAV,F
	SWAPF SYS_WSAV,W

	RETFIE


;****************************************
; Subroutines
;****************************************


;****************************************
;Initialisierung
;****************************************


SYS_INIT

	MOVLW B'00100000'
	MOVWF INTCON

; Set output before direction

	BCF STATUS,RP0	; Bank 0
	BCF STATUS,RP1	; Bank 0
	MOVLW B'00000000'
	MOVWF PORTA

	MOVLW B'10000000'
	MOVWF PORTB

	MOVLW 143
	BSF STATUS,RP0	; Bank 1
	MOVWF OPTION_REG


; Richtung setzen

	MOVLW B'11111111'
	MOVWF TRISA

	MOVLW B'01111111'
	MOVWF TRISB

	BCF STATUS,RP0	; Bank 0
	MOVLW 7	; Comparators off
	MOVWF CMCON
; init vars


; Clear RAM

	BCF STATUS,IRP
	MOVLW 32
	MOVWF FSR
CR1
	CLRF INDF
	INCF FSR,F
	BTFSS FSR,7
	GOTO CR1
	BSF FSR,5
CR2
	CLRF INDF
	INCF FSR,F
	MOVLW H'F0'
	SUBWF FSR,W
	BTFSS STATUS,ZERO
	GOTO CR2
	BSF STATUS,IRP
	MOVLW 32
	MOVWF FSR
CR3
	CLRF INDF
	INCF FSR,F
	MOVLW H'50'
	SUBWF FSR,W
	BTFSS STATUS,ZERO
	GOTO CR3


;*****************************************
; initalisize UA1
;*****************************************

	BCF STATUS,RP0	; Bank 0
	BCF STATUS,RP1	; Bank 0
	MOVLW B'10010000'	; serial enable,8-bit,continous-enable
	MOVWF RCSTA

	BSF STATUS,RP0	; Bank 1
	MOVLW 25
	MOVWF SPBRG	; BAUDRATE GENERATOR
	MOVLW B'00000100'	; 8-BIt,TRANSMIT DISABLED,ASYNCHRON,BRGH=1=HIGH SPEED
	MOVWF TXSTA
	BSF PIE1,TXIE	; enable INTERRUPT for transmit

	BSF INTCON,PEIE	; PERIPHERIE INT ENABLE

	BCF STATUS,RP0	; Bank 0
	BCF STATUS,RP1	; Bank 0
	CLRF TMR0
	BCF INTCON,T0IF
	BSF INTCON,GIE	; Interrupt freigeben

;**********************************
;******* Haupt-Programm ***********
;**********************************

MAIN

;***************************************************
; UDATA -> UD1
;***************************************************

	BCF STATUS,RP0	; Bank 0
	BCF STATUS,RP1	; Bank 0
	BTFSC S0,1	; active
	GOTO LABEL_UD1_1	; yes

; test positive edge

	BTFSS S0,0
	GOTO LABEL_UD1_SETFD
	BTFSC UD1_FD,0
	GOTO LABEL_UD1_SETFD
	BSF UD1_FD,0

	BCF UA1RSFLAG,2		; set not ready
	BSF S0,1	; active

	MOVLW LOW UA1OUTBUF+2	; set pointer (ADRESS)
	MOVWF UA1OUTBUF
	MOVLW H'AA'	; init checksum
	MOVWF UA1OUTBUF+3
	MOVLW 2	; 2 bytes
	MOVWF UA1OUTBUF+1
	BCF INTCON,GIE	; disable interrupts
	BTFSC INTCON,GIE	; disabled ?
	GOTO $-2	; no
	MOVFW ZV1
	MOVWF UA1OUTBUF+2
	ADDWF UA1OUTBUF+3,F
	BSF STATUS,RP0	; Bank 1
	BSF TXSTA,TXEN
	BSF INTCON,GIE	; enable interrupts
LABEL_UD1_1
	BCF STATUS,RP0	; Bank 0
	BCF STATUS,RP1	; Bank 0
	BTFSS UA1RSFLAG,2	; transmit ready ?
	GOTO LABEL_UD1_2	; no
	BCF S0,1	; not active

LABEL_UD1_2

LABEL_UD1_SETFD

; test negative edge

	BCF STATUS,RP0	; Bank 0
	BCF STATUS,RP1	; Bank 0
	BTFSC S0,0
	GOTO LABEL_UD1_EXIT
	BCF UD1_FD,0

LABEL_UD1_EXIT

;***************************************************
; Timer -> TR1
;***************************************************

	MOVLW 0	; Test auf >=
	BCF STATUS,RP0	; Bank 0
	BCF STATUS,RP1	; Bank 0
	SUBWF TR1_HI,W	;F-W -> W
	BTFSS STATUS,ZERO
	GOTO LABEL_TR1_CHECK
	MOVLW 195
	SUBWF TR1,W	;F-W -> W
LABEL_TR1_CHECK
	BTFSS STATUS,CARRY
	GOTO LABEL_TR1_ENDE

LABEL_TR1_RESET
	MOVLW 0	; Test auf >=
	SUBWF TR1_HI,F	;F-W -> F
	MOVLW 195
	SUBWF TR1,F	;F-W -> F
	BTFSS STATUS,CARRY
	DECF TR1_HI,F

LABEL_TR1_SET	; toggel output
	BTFSC S0,0
	GOTO LABEL_TR1_CLR
	BSF S0,0
	GOTO LABEL_TR1_ENDE
LABEL_TR1_CLR
	BCF S0,0
LABEL_TR1_ENDE

;***************************************************
; One Shot -> OS1
;***************************************************


	BCF STATUS,RP0	; Bank 0
	BCF STATUS,RP1	; Bank 0
	BTFSC PORTA,0
	GOTO LABEL_OS1_1
	BTFSC OS1_FD,0
	GOTO LABEL_OS1_1
	BSF OS1_FD,0
	BSF S0,3
	GOTO LABEL_OS1_2
LABEL_OS1_1
	BCF STATUS,RP0	; Bank 0
	BCF STATUS,RP1	; Bank 0
	BCF S0,3
	BTFSS PORTA,0
	GOTO LABEL_OS1_2
	BCF OS1_FD,0
LABEL_OS1_2
;***************************************************
; Zähler -> ZV1
;***************************************************

	BCF STATUS,RP0	; Bank 0
	BCF STATUS,RP1	; Bank 0
	BTFSS S0,2	; Reset ?
	GOTO LABEL_ZV1_COUNT
	CLRF ZV1
	GOTO LABEL_ZV1_SETOUT

LABEL_ZV1_COUNT

; Test auf positive Flanke

	BCF STATUS,RP0	; Bank 0
	BCF STATUS,RP1	; Bank 0
	BTFSS S0,3
	GOTO LABEL_ZV1_SETFD
	BTFSC ZV1_FD,0
	GOTO LABEL_ZV1_SETFD

	BSF ZV1_FD,0


	BTFSC S0,4	; Vorwärts oder Rückwärts ?
	GOTO LABEL_ZV1_BACKWARD

	INCF ZV1,F
	GOTO LABEL_ZV1_SETOUT

LABEL_ZV1_BACKWARD
	BCF STATUS,RP0	; Bank 0
	BCF STATUS,RP1	; Bank 0
	DECF ZV1,F

LABEL_ZV1_SETOUT


LABEL_ZV1_SETFD

; Test auf negative Flanke

	BCF STATUS,RP0	; Bank 0
	BCF STATUS,RP1	; Bank 0
	BTFSC S0,3
	GOTO LABEL_ZV1_EXIT
	BCF ZV1_FD,0

LABEL_ZV1_EXIT

;***************************************************
; Schmitt-Trigger 8-Bit -> ST1
;***************************************************

	BCF STATUS,RP0	; Bank 0
	BCF STATUS,RP1	; Bank 0
	BTFSC S0,2	; Ausgang gesetzt ?
	GOTO LABEL_ST1_MH	; dann mit Hysterese ?

	MOVLW 100
	GOTO LABEL_ST1_TEST

LABEL_ST1_MH

	MOVLW 100
LABEL_ST1_TEST

	SUBWF ZV1,W
	BTFSS STATUS,CARRY
	GOTO LABEL_ST1_RESET

	BSF S0,2	; if greater or equal
	GOTO LABEL_ST1_ENDE

LABEL_ST1_RESET
	BCF S0,2	; if less
LABEL_ST1_ENDE

;***************************************************
; GND
;***************************************************

	BCF S0,4	; immer Low

;****************************************

	GOTO MAIN


	END