; Source created with Parsic Version 3.x

; at              : 2009.02.09. 20:00:59


; Project File    : C:\PROGRA~1\Parsic\HE\LPA01.PIC

; Project Version : 1.0.3

; Created         : 2009.02.09. 19:44:53

; Last change     : 2009.02.09. 20:00:58

	PROCESSOR 16F876

	INCLUDE P16F876.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_HI	= 36	; located in Bank 0
ZV1_FD	= 37	; located in Bank 0
ADC0	= 38	; located in Bank 0
ADC0_HI	= 39	; located in Bank 0
RAM	= 40	; 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_TMP1	= 117	; located in Bank 0, 1, 2, 3
SYS_TMP2	= 118	; located in Bank 0, 1, 2, 3
SYS_FSAV	= 119	; 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
;****************************************

;***************************************************
; Read  -> AN0
;***************************************************

READ_AN0

	MOVLW B'100'
	BSF STATUS,RP0	; Bank 1
	BCF STATUS,RP1	; Bank 1
	MOVWF ADCON1
	BSF TRISA,0
	BSF ADCON1,ADFM	; Right-Justified

	MOVLW B'11000001'	; CH0
	BCF STATUS,RP0	; Bank 0
	MOVWF ADCON0
	MOVLW 5
	MOVWF SYS_TMP1

SYS_ADC_LABEL_0
	DECFSZ SYS_TMP1,F
	GOTO SYS_ADC_LABEL_0

	BSF ADCON0,GO	; Start convert

SYS_ADC_LABEL_1

	BTFSC ADCON0,GO	; ready ?
	GOTO SYS_ADC_LABEL_1	; no

	BSF STATUS,RP0	; Bank 1
	MOVFW ADRESL
	BCF STATUS,RP0	; Bank 0
	MOVWF ADC0
	MOVFW ADRESH
	MOVWF ADC0_HI

	MOVLW 6
	BSF STATUS,RP0	; Bank 1
	MOVWF ADCON1
	MOVLW B'11111111'
	MOVWF TRISA
	RETURN


;****************************************
;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 143
	BSF STATUS,RP0	; Bank 1
	MOVWF OPTION_REG

	MOVLW 6	; all Digital
	MOVWF ADCON1

; Richtung setzen

	MOVLW B'11111111'
	MOVWF TRISA

	MOVLW B'11111110'
	MOVWF TRISB

	MOVLW B'11111111'
	MOVWF TRISC

; 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

	CALL READ_AN0
;***************************************************
; 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 20
	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 20
	SUBWF TR1,F	;F-W -> F
	BTFSS STATUS,CARRY
	DECF TR1_HI,F

LABEL_TR1_SET	; toggel output
	BTFSC S0,4
	GOTO LABEL_TR1_CLR
	BSF S0,4
	GOTO LABEL_TR1_ENDE
LABEL_TR1_CLR
	BCF S0,4
LABEL_TR1_ENDE

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

	BCF STATUS,RP0	; Bank 0
	BCF STATUS,RP1	; Bank 0
	BTFSS S0,0	; Reset ?
	GOTO LABEL_ZV1_COUNT
	CLRF ZV1
	CLRF ZV1_HI
	GOTO LABEL_ZV1_SETOUT

LABEL_ZV1_COUNT

; Test auf positive Flanke

	BCF STATUS,RP0	; Bank 0
	BCF STATUS,RP1	; Bank 0
	BTFSS S0,4
	GOTO LABEL_ZV1_SETFD
	BTFSC ZV1_FD,0
	GOTO LABEL_ZV1_SETFD

	BSF ZV1_FD,0


	BTFSC S0,5	; Vorwärts oder Rückwärts ?
	GOTO LABEL_ZV1_BACKWARD

	INCFSZ ZV1,F
	GOTO LABEL_ZV1_SETOUT
	INCF ZV1_HI,F
	GOTO LABEL_ZV1_SETOUT

LABEL_ZV1_BACKWARD
	BCF STATUS,RP0	; Bank 0
	BCF STATUS,RP1	; Bank 0
	DECF ZV1,F
	INCFSZ ZV1,W
	GOTO LABEL_ZV1_SETOUT
	DECF ZV1_HI,F

LABEL_ZV1_SETOUT


LABEL_ZV1_SETFD

; Test auf negative Flanke

	BCF STATUS,RP0	; Bank 0
	BCF STATUS,RP1	; Bank 0
	BTFSC S0,4
	GOTO LABEL_ZV1_EXIT
	BCF ZV1_FD,0

LABEL_ZV1_EXIT

;***************************************************
; Schmitt-Trigger 16-Bit -> ST1
;***************************************************

	BCF STATUS,RP0	; Bank 0
	BCF STATUS,RP1	; Bank 0
	MOVFW ADC0
	MOVWF SYS_TMP1
	MOVFW ADC0_HI
	MOVWF SYS_TMP2

	BTFSS S0,0	; Ausgang gesetzt ?
	GOTO LABEL_ST1_TEST	; without Hysterese

	MOVLW HIGH 0
	SUBWF SYS_TMP2,F
	MOVLW LOW 0
	SUBWF SYS_TMP1,F
	BTFSS STATUS,CARRY
	DECF SYS_TMP2,F

LABEL_ST1_TEST
	MOVFW SYS_TMP2
	BCF STATUS,RP0	; Bank 0
	BCF STATUS,RP1	; Bank 0
	SUBWF ZV1_HI,W

	BTFSS STATUS,ZERO
	GOTO LABEL_ST1_TEST2

	MOVFW SYS_TMP1
	SUBWF ZV1,W

LABEL_ST1_TEST2
	BCF STATUS,RP0	; Bank 0
	BCF STATUS,RP1	; Bank 0
	BTFSS STATUS,CARRY
	GOTO LABEL_ST1_RESET

LABEL_ST1_SET
	BSF S0,0	; if greater or equal
	GOTO LABEL_ST1_ENDE

LABEL_ST1_RESET
	BCF S0,0	; if less
LABEL_ST1_ENDE

;***************************************************
; RS-FLIP-FLOP -> RS1
;***************************************************

	BTFSC S0,1
	GOTO LABEL_RS1_RESET
	BTFSS S0,2
	GOTO LABEL_RS1_ENDE
	BSF S0,3	; Ausgang setzen
	GOTO LABEL_RS1_ENDE
LABEL_RS1_RESET
	BCF STATUS,RP0	; Bank 0
	BCF STATUS,RP1	; Bank 0
	BCF S0,3	; Ausgang zurücksetzen
LABEL_RS1_ENDE

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

LABEL_LG1_1
	BCF STATUS,RP0	; Bank 0
	BCF STATUS,RP1	; Bank 0
	BTFSS S0,3
	GOTO LABEL_LG1_FALSE
LABEL_LG1_2
	BTFSS S0,0
	GOTO LABEL_LG1_FALSE

LABEL_LG1_TRUE
	BSF S0,1
	GOTO LABEL_LG1_ENDE
LABEL_LG1_FALSE
	BCF STATUS,RP0	; Bank 0
	BCF STATUS,RP1	; Bank 0
	BCF S0,1
LABEL_LG1_ENDE
;***************************************************
; UND - Gatter -> LG2
;***************************************************

LABEL_LG2_1
	BTFSS S0,0
	GOTO LABEL_LG2_FALSE
LABEL_LG2_2
	BTFSC S0,3
	GOTO LABEL_LG2_FALSE

LABEL_LG2_TRUE
	BSF S0,2
	GOTO LABEL_LG2_ENDE
LABEL_LG2_FALSE
	BCF STATUS,RP0	; Bank 0
	BCF STATUS,RP1	; Bank 0
	BCF S0,2
LABEL_LG2_ENDE
;***************************************************
; GND
;***************************************************

	BCF S0,5	; immer Low

;***************************************************
; UND - Gatter -> LG3
;***************************************************

LABEL_LG3_1
	BTFSS S0,3
	GOTO LABEL_LG3_FALSE

LABEL_LG3_TRUE
	BSF PORTB,0
	GOTO LABEL_LG3_ENDE
LABEL_LG3_FALSE
	BCF STATUS,RP0	; Bank 0
	BCF STATUS,RP1	; Bank 0
	BCF PORTB,0
LABEL_LG3_ENDE
;****************************************

	GOTO MAIN


	END