; Source created with Parsic Version 3.x

; at              : 2010.03.24. 19:14:38


; Project File    : C:\PROGRA~1\Parsic\Projekt\Ld_vill2.PIC

; Project Version : 1.0.0

; Created         : 2010.03.24. 19:10:03

; Last change     : 2010.03.24. 19:14:34

	PROCESSOR 16F877

	INCLUDE P16F877.INC

	RADIX DEC


	__IDLOCS H'0100'

	__CONFIG _CP_OFF & _PWRTE_ON & _WDT_OFF & _BODEN_ON & _XT_OSC & _LVP_OFF & _CPD_OFF & _DEBUG_OFF

; Diverses

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


; Variable

TR1	= 32	; located in Bank 0
TR1_HI	= 33	; located in Bank 0
S0	= 34	; located in Bank 0
ZV1	= 35	; located in Bank 0
ZV1_FD	= 36	; located in Bank 0
RAM	= 37	; located in Bank 0
SYS_WSAV	= 114	; located in Bank 0, 1, 2, 3
SYS_SSAV	= 115	; located in Bank 0, 1, 2, 3
SYS_PSAV	= 116	; located in Bank 0, 1, 2, 3
SYS_FSAV	= 117	; 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
	MOVLW HIGH SYS_INIT	; set page
	MOVWF PCLATH
	GOTO SYS_INIT

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

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


	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


EXITINT
	MOVFW SYS_PSAV
	MOVWF PCLATH

	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'00000000'
	MOVWF PORTB

	MOVLW B'00000000'
	MOVWF PORTC

	MOVLW B'00000000'
	MOVWF PORTD

	MOVLW B'00000000'
	MOVWF PORTE

	MOVLW 143
	BSF STATUS,RP0	; Bank 1
	MOVWF OPTION_REG

	MOVLW 6	; all Digital
	MOVWF ADCON1

; Richtung setzen

	MOVLW B'11111111'
	MOVWF TRISA

	MOVLW B'11111100'
	MOVWF TRISB

	MOVLW B'11111111'
	MOVWF TRISC

	MOVLW B'11111111'
	MOVWF TRISD

	MOVLW B'00000111'
	MOVWF TRISE

; 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 16
	MOVWF FSR
CR3
	CLRF INDF
	INCF FSR,F
	MOVLW H'70'
	SUBWF FSR,W
	BTFSS STATUS,ZERO
	GOTO CR3
	MOVLW 144
	MOVWF FSR
CR4
	CLRF INDF
	INCF FSR,F
	MOVLW H'F0'
	SUBWF FSR,W
	BTFSS STATUS,ZERO
	GOTO CR4


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

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

MAIN

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

	MOVLW 1	; 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 135
	SUBWF TR1,W	;F-W -> W
LABEL_TR1_CHECK
	BTFSS STATUS,CARRY
	GOTO LABEL_TR1_ENDE

LABEL_TR1_RESET
	MOVLW 1	; Test auf >=
	SUBWF TR1_HI,F	;F-W -> F
	MOVLW 135
	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

;***************************************************
; Zähler -> ZV1
;***************************************************

	BCF STATUS,RP0	; Bank 0
	BCF STATUS,RP1	; Bank 0
	BTFSS S0,1	; 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 S0,0
	GOTO LABEL_ZV1_SETFD
	BTFSC ZV1_FD,0
	GOTO LABEL_ZV1_SETFD

	BSF ZV1_FD,0


	BTFSC S0,1	; 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

; Output Q0

	BCF STATUS,RP0	; Bank 0
	BCF STATUS,RP1	; Bank 0
	BTFSS ZV1,0
	GOTO LABEL_ZV1_SETOUT0
	BSF S0,2
	GOTO LABEL_ZV1_SETOUT0_END
LABEL_ZV1_SETOUT0
	BCF S0,2
LABEL_ZV1_SETOUT0_END

; Output Q1

	BTFSS ZV1,1
	GOTO LABEL_ZV1_SETOUT1
	BSF S0,3
	GOTO LABEL_ZV1_SETOUT1_END
LABEL_ZV1_SETOUT1
	BCF S0,3
LABEL_ZV1_SETOUT1_END


LABEL_ZV1_SETFD

; Test auf negative Flanke

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

LABEL_ZV1_EXIT

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

	BCF STATUS,RP0	; Bank 0
	BCF STATUS,RP1	; Bank 0
	BCF S0,1	; immer Low

;***************************************************
; UND - Gatter -> LG1
;***************************************************

LABEL_LG1_1
	BTFSS S0,0
	GOTO LABEL_LG1_FALSE

LABEL_LG1_TRUE
	BSF PORTB,0
	GOTO LABEL_LG1_ENDE
LABEL_LG1_FALSE
	BCF STATUS,RP0	; Bank 0
	BCF STATUS,RP1	; Bank 0
	BCF PORTB,0
LABEL_LG1_ENDE
;***************************************************
; UND - Gatter -> LG2
;***************************************************

LABEL_LG2_1
	BTFSS S0,3
	GOTO LABEL_LG2_FALSE

LABEL_LG2_TRUE
	BSF PORTB,1
	GOTO LABEL_LG2_ENDE
LABEL_LG2_FALSE
	BCF STATUS,RP0	; Bank 0
	BCF STATUS,RP1	; Bank 0
	BCF PORTB,1
LABEL_LG2_ENDE
;****************************************

	GOTO MAIN


	END