;******************************************** ; PFC-50 POCKET FREQUENCY COUNTER ;******************************************** ; ;WATCHDOG DISABLED ; ;********************************************************** LIST P=16F84A #include __CONFIG _XT_OSC & _WDT_OFF & _PWRTE_ON ERRORLEVEL -302 ; ;********************************************************** RS EQU 2H RW EQU 1H E EQU 0H O EQU 7H ; COUNT1 EQU 2CH COUNT2 EQU 2DH IN_REG EQU 2EH ADDCNT EQU 2FH GATE EQU 0CH CNT1 EQU 0DH CNT2 EQU 0EH CNT3 EQU 0FH CALC1 EQU 10H CALC2 EQU 11H CALC3 EQU 12H SUM1 EQU 13H SUM2 EQU 14H SUM3 EQU 15H RTCC2 EQU 16H TEMP1 EQU 17H TEMP2 EQU 18H COUNT3 EQU 19H COUNT4 EQU 1AH ;----------------------------------------------- ;----------------------------------------------- ;----------------------------------------------- ORG 0 GOTO START ; INT_DEL: MOVLW 0X05 ;DELAY 5.000 MS (4 MHZ CLOCK) MOVWF COUNT1 D1 MOVLW 0XA5 MOVWF COUNT2 D2 DECFSZ COUNT2,F GOTO D2 DECFSZ COUNT1,F GOTO D1 RETLW 0X00 ; MIRROR: CLRF TEMP2 MOVWF TEMP1 BTFSC TEMP1,0 BSF TEMP2,7 BTFSC TEMP1,1 BSF TEMP2,6 BTFSC TEMP1,2 BSF TEMP2,5 BTFSC TEMP1,3 BSF TEMP2,4 BTFSC TEMP1,4 BSF TEMP2,3 BTFSC TEMP1,5 BSF TEMP2,2 BTFSC TEMP1,6 BSF TEMP2,1 BTFSC TEMP1,7 BSF TEMP2,0 MOVF TEMP2,W RETURN ; LCD_OUT: CALL MIRROR MOVWF PORTB ;LOAD DATA INTO PORTB BSF STATUS,RP0 MOVLW B'00000000' ;DEFINE PORTB AS OUTPUT MOVWF TRISB BCF STATUS,RP0 BSF PORTA,RS ;RS = DATA BCF PORTA,RW ;R/W = WRITE BSF PORTA,E ;TOGGLE ENABLE BCF PORTA,E ; BSF STATUS,RP0 MOVLW B'11111111' ;DEFINE PORTB AS INPUT MOVWF TRISB BCF STATUS,RP0 ; BCF PORTA,RS ;RS = INSTRUCTION BSF PORTA,RW ;R/W = READ BSF PORTA,E ;ENABLE HIGH MOVF PORTB,W ;GET ADDRESS COUNTER CALL MIRROR MOVWF ADDCNT BSF ADDCNT,7 BCF PORTA,E ;ENABLE LOW OUT1 BSF PORTA,E ;ENABLE HIGH BTFSS PORTB,0 ;TEST BUSY FLAG GOTO OUT2 BCF PORTA,E ;ENABLE LOW GOTO OUT1 OUT2 BCF PORTA,E ;ENABLE LOW GOTO SHIFT ; INST: CALL MIRROR MOVWF PORTB ;LOAD INSTRUCTION INTO PORTB BSF STATUS,RP0 MOVLW B'00000000' ;DEFINE PORTB AS OUTPUT MOVWF TRISB BCF STATUS,RP0 BCF PORTA,RS ;RS = INSTRUCTION BCF PORTA,RW ;R/W = WRITE BSF PORTA,E ;TOGGLE ENABLE BCF PORTA,E BSF STATUS,RP0 MOVLW B'11111111' ;DEFINE PORTB AS INPUT MOVWF TRISB BCF STATUS,RP0 BSF PORTA,RW ;R/W = READ INST1: BSF PORTA,E ;ENABLE HIGH BTFSS PORTB,0 ;TEST BUSY FLAG GOTO INST2 BCF PORTA,E ;ENABLE LOW GOTO INST1 INST2: BCF PORTA,E ;ENABLE LOW RETLW 0X00 ; ;----------------------------------- ; LCD 16X1 SHIFT: BTFSS ADDCNT,0 ;SHIFT TO OPPOSITE SIDE OF DISPLAY? RETLW 0X00 BTFSS ADDCNT,1 RETLW 0X00 BTFSS ADDCNT,2 RETLW 0X00 MOVLW 0XC0 MOVF ADDCNT,W MOVLW 0XC0 GOTO INST ;------------------------------------ SUB BCF STATUS,O ;CLEAR OVERFLOW BIT MOVF CALC1,W ;SUBTRACT CALC1 FROM CNT1 SUBWF CNT1 ,F BTFSC STATUS,C GOTO SB1 MOVLW 0X01 ;BORROW FROM CNT2 IF OVERFLOW SUBWF CNT2 ,F BTFSC STATUS,C GOTO SB1 SUBWF CNT3 ,F ;BORROW FROM CNT3 IF CNT2 OVERFLOW BTFSS STATUS,C BSF STATUS,O ;SET OVERFLOW BIT IF RESULT IS NEGATIVE SB1 MOVF CALC2,W ;SUBTRACT CALC2 FROM CNT2 SUBWF CNT2 ,F BTFSC STATUS,C GOTO SB2 MOVLW 0X01 ;BORROW FROM CNT3 IF CNT2 OVERFLOW SUBWF CNT3 ,F BTFSS STATUS,C BSF STATUS,O ;SET OVERFLOW BIT IF RESULT IS NEGATIVE SB2 MOVF CALC3,W ;SUBTRACT CALC3 FROM CNT3 SUBWF CNT3 ,F BTFSS STATUS,C BSF STATUS,O ;SET OVERFLOW BIT IF RESULT IS NEGATIVE RETLW 0X00 ;----------------------------------- ADD MOVF CALC1,W ;ADD CALC1 TO CNT1 ADDWF CNT1 ,F BTFSS STATUS,C GOTO AD1 INCFSZ CNT2 ,F ;ADD TO CNT2 IF CNT1 OVERFLOW GOTO AD1 INCF CNT3 ,F ;ADD TO CNT3 IF CNT2 OVERFLOW AD1 MOVF CALC2,W ;ADD CALC2 TO CNT2 ADDWF CNT2 ,F BTFSC STATUS,C INCF CNT3 ,F ;ADD TO CNT3 IF CNT2 OVERFLOW MOVF CALC3,W ;ADD CALC3 TO CNT3 ADDWF CNT3 ,F RETLW 0X00 ;----------------------------------- CNVT MOVLW 0X07 ;7 DIGITS IN DISPLAY MOVWF COUNT1 MOVLW 0X19 ;SET FSR FOR MSB IN DISPLAY MOVWF FSR MOVLW 0X2F ;ONE LESS THAT ASCII "0" CNVT0: MOVWF INDF INCF FSR ,F DECFSZ COUNT1 ,F GOTO CNVT0 MOVLW 0X0F ;LOAD "1,000,000" IN CALC1-3 MOVWF CALC3 MOVLW 0X42 MOVWF CALC2 MOVLW 0X40 MOVWF CALC1 CNVT1: CALL SUB ;SUBTRACT NUMBER FROM COUNT INCF 19 ,F ;INCREMENT 1,000,000'S REGISTER MOVLW 0X3A XORWF 19,W BTFSC STATUS,Z GOTO OVERFLOW BTFSS STATUS,O ;CHECK IF OVERFLOW GOTO CNVT1 CALL ADD ;ADD BACK LAST NUMBER MOVLW 0X01 ;LOAD "100,000" IN CALC1-3 MOVWF CALC3 MOVLW 0X86 MOVWF CALC2 MOVLW 0XA0 MOVWF CALC1 CNVT2: CALL SUB ;SUBTRACT NUMBER FROM COUNT INCF 1A ,F ;INCREMENT 100,000'S REGISTER BTFSS STATUS,O ;CHECK IF OVERFLOW GOTO CNVT2 CALL ADD ;ADD BACK LAST NUMBER CLRF CALC3 ;LOAD "10,000" IN CALC1-3 MOVLW 0X27 MOVWF CALC2 MOVLW 0X10 MOVWF CALC1 CNVT3: CALL SUB ;SUBTRACT NUMBER FROM COUNT INCF 1B ,F ;INCREMENT 10,000'S REGISTER BTFSS STATUS,O ;CHECK IF OVERFLOW GOTO CNVT3 CALL ADD ;ADD BACK LAST NUMBER MOVLW 0X03 ;LOAD "1,000" IN CALC1-3 MOVWF CALC2 MOVLW 0XE8 MOVWF CALC1 CNVT4: CALL SUB ;SUBTRACT NUMBER FROM COUNT INCF 1C ,F ;INCREMENT 1,000'S REGISTER BTFSS STATUS,O ;CHECK IF OVERFLOW GOTO CNVT4 CALL ADD ;ADD BACK LAST NUMBER CLRF CALC2 ;LOAD "100" IN CALC1-3 MOVLW 0X64 MOVWF CALC1 CNVT5: CALL SUB ;SUBTRACT NUMBER FROM COUNT INCF 1D ,F ;INCREMENT 100'S REGISTER BTFSS STATUS,O ;CHECK IF OVERFLOW GOTO CNVT5 CALL ADD ;ADD BACK NUMBER MOVLW 0X0A ;LOAD "10" IN CALC1-3 MOVWF CALC1 CNVT6: CALL SUB ;SUBTRACT NUMBER FROM COUNT INCF 1E ,F ;INCREMENT 10'S REGISTER BTFSS STATUS,O ;CHECK IF OVERFLOW GOTO CNVT6 CALL ADD ;ADD BACK LAST NUMBER MOVF CNT1,W ;PUT REMAINDFER IN 1'S REGISTER ADDWF 1F ,F INCF 1F ,F RETLW 0X00 ;----------------------------------- COUNT: BSF STATUS,RP0 MOVLW B'00110111' ;TMR0 = EXT, 1/256 MOVWF OPTION_REG MOVLW B'00010000' ;DEFINE PORTA AS OUTPUT MOVWF TRISA BCF STATUS,RP0 BCF PORTA,3 BCF PORTA,2 CLRF CNT3 CLRF TMR0 CLRF RTCC2 BSF PORTA,2 ;TOGGLE TMR0 PIN BCF PORTA,2 MOVF GATE,W ;GET GATE TIME MOVWF COUNT1 BSF PORTA,3 ;START COUNT FR4 MOVLW 0XFA MOVWF COUNT2 GOTO FR6 FR5 NOP NOP NOP NOP NOP NOP FR6 MOVF TMR0,W ;TEST FOR TMR0 ROLLOVER (12) SUBWF RTCC2 ,F BTFSS STATUS,Z GOTO FR7 NOP GOTO FR8 FR7 BTFSC STATUS,C INCF CNT3 ,F FR8 MOVWF RTCC2 NOP NOP NOP DECFSZ COUNT2 ,F GOTO FR5 DECFSZ COUNT1 ,F GOTO FR4 BCF PORTA,3 ;STOP COUNT MOVF TMR0,W ;GET TMR0 COUNT MOVWF CNT2 SUBWF RTCC2 ,F ;TEST FOR TMR0 ROLLOVER BTFSS STATUS,C GOTO FR9 BTFSS STATUS,Z INCF CNT3 ,F FR9 CLRF CNT1 ;SET TO GET PRESCALER COUNT FR10 DECF CNT1 ,F BSF PORTA,2 ;TOGGLE TMR0 PIN BCF PORTA,2 MOVF TMR0,W ;TEST IF TMR0 HAS CHANGED XORWF CNT2,W BTFSC STATUS,Z GOTO FR10 RETLW 0X00 ; ;********************************************************* ; START MAIN PROGRAM ;********************************************************* ; START: CLRF PORTA ;INSTRUCTION, WRITE, ENABLE LOW CLRF PORTB ; BSF STATUS,RP0 MOVLW B'00010000' MOVWF TRISA MOVLW B'00000000' MOVWF TRISB BCF STATUS,RP0 CALL INT_DEL CALL INT_DEL CALL INT_DEL ; MOVLW 0X38 ;INITIALIZE DISPLAY CALL MIRROR MOVWF PORTB ; BSF PORTA,E ;TOGGLE ENABLE CALL INT_DEL BCF PORTA,E BSF PORTA,E ;TOGGLE ENABLE CALL INT_DEL BCF PORTA,E BSF PORTA,E ;TOGGLE ENABLE CALL INT_DEL BCF PORTA,E ; MOVLW 0X38 ;FUNCTION CALL INST MOVLW B'00001100' ;DISPLAY ON, CURSOR OFF CALL INST MOVLW B'00000001' ;CLEAR DISPLAY CALL INST MOVLW B'00000110' ;ENTRY MODE CALL INST ; ;*********************************** ; NEW LINES HERE FOR INTRO MOVLW 0X20 ;space CALL LCD_OUT MOVLW 0X46 ;F CALL LCD_OUT MOVLW 0X72 ;r CALL LCD_OUT MOVLW 0X65 ;e CALL LCD_OUT MOVLW 0X6B ;k CALL LCD_OUT MOVLW 0X76 ;v CALL LCD_OUT MOVLW 0X65 ;e CALL LCD_OUT MOVLW 0X6E ;n CALL LCD_OUT MOVLW 0X63 ;c CALL LCD_OUT MOVLW 0X69 ;i CALL LCD_OUT MOVLW 0X61 ;a CALL LCD_OUT MOVLW 0X6D ;m CALL LCD_OUT MOVLW 0X65 ;e CALL LCD_OUT MOVLW 0X72 ;r CALL LCD_OUT MOVLW 0X6F ;o CALL LCD_OUT ; MOVLW 0X06 ;CHANGE THE 6 TO A SMALLER NO. TO SPEED UP THE INTRO MOVWF COUNT3 WAIT1: MOVLW 0XC8 MOVWF COUNT4 WAIT2: CALL INT_DEL DECFSZ COUNT4 ,F GOTO WAIT2 DECFSZ COUNT3 ,F GOTO WAIT1 ;************************************ MOVLW B'00000001' ;CLEAR DISPLAY CALL INST ; MHZ MOVLW 0X14 ;0.1 SEC GATE MOVWF GATE CALL COUNT CALL CNVT ;CONVERT BINARY TO BCD MOVLW 0X30 ;TEST IF "0" XORWF 19,W BTFSS STATUS,Z GOTO MHZ1 MOVLW 0X30 ;TEST IF "0" XORWF 1A,W BTFSC STATUS,Z GOTO KHZ1 MHZ1 MOVLW 0X82 ;SET DISPLAY ADDRESS CALL INST MOVLW 0X02 ;OUTPUT FIRST 2 CHARACTERS MOVWF COUNT1 MOVLW 0X19 ;MSD OF FREQ MOVWF FSR MHZ2 MOVLW 0X30 ;TEST IF "0" XORWF INDF,W BTFSS STATUS,Z GOTO MHZ3 MOVLW 0X20 ;CHANGE PRECEEDING "0'S" TO "SPACE" CALL LCD_OUT INCF FSR ,F DECFSZ COUNT1 ,F GOTO MHZ2 GOTO MHZ4 MHZ3 MOVF INDF,W CALL LCD_OUT INCF FSR ,F DECFSZ COUNT1 ,F GOTO MHZ3 MHZ4 MOVLW 0X2E ;"." CALL LCD_OUT MOVLW 0X05 ;OUTPUT LAST 5 CHARACTERS MOVWF COUNT1 MHZ5 MOVF INDF,W CALL LCD_OUT INCF FSR ,F DECFSZ COUNT1 ,F GOTO MHZ5 MOVLW 0X20 ;"SPACE" CALL LCD_OUT MOVLW 0X4D ;"M" CALL LCD_OUT MOVLW 0X48 ;"H" CALL LCD_OUT MOVLW 0X7A ;"Z" CALL LCD_OUT MOVLW 0X20 ;"SPACE" CALL LCD_OUT MOVLW 0X20 ;"SPACE" CALL LCD_OUT GOTO MHZ ;----------------------------------- KHZ MOVLW 0X14 ;0.1 SEC GATE MOVWF GATE CALL COUNT CALL CNVT ;CONVERT BINARY TO BCD MOVLW 0X30 ;TEST IF 0 XORWF 19,W BTFSS STATUS,Z GOTO MHZ1 MOVLW 0X32 ;TEST IF < 2 SUBWF 1A,W BTFSC STATUS,C GOTO MHZ1 MOVLW 0X30 ;TEST IF "0" XORWF 1A,W BTFSS STATUS,Z GOTO KHZ1 MOVLW 0X30 ;TEST IF "0" XORWF 1B,W BTFSC STATUS,Z GOTO XKHZ KHZ1 MOVLW 0X82 ;SET DISPLAY ADDRESS CALL INST MOVLW 0X05 ;OUTPUT FIRST 5 CHARACTERS MOVWF COUNT1 MOVLW 0X19 ;MSD OF FREQ MOVWF FSR KHZ2 MOVLW 0X30 ;TEST IF "0" XORWF INDF,W BTFSS STATUS,Z GOTO KHZ3 MOVLW 0X20 ;CHANGE PRECEEDING "0'S" TO "SPACE" CALL LCD_OUT INCF FSR ,F DECFSZ COUNT1 ,F GOTO KHZ2 GOTO KHZ4 KHZ3 MOVF INDF,W CALL LCD_OUT INCF FSR ,F DECFSZ COUNT1 ,F GOTO KHZ3 KHZ4 MOVLW 0X2E ;"." CALL LCD_OUT MOVF INDF,W ;OUTPUT LAST 2 CHARACTERS CALL LCD_OUT INCF FSR ,F MOVF INDF,W CALL LCD_OUT MOVLW 0X20 ;"SPACE" CALL LCD_OUT MOVLW 0X4B ;"K" CALL LCD_OUT MOVLW 0X48 ;"H" CALL LCD_OUT MOVLW 0X7A ;"Z" CALL LCD_OUT MOVLW 0X20 ;"SPACE" CALL LCD_OUT MOVLW 0X20 ;"SPACE" CALL LCD_OUT GOTO KHZ ;----------------------------------- XKHZ MOVLW 0XC8 ;1 SEC GATE MOVWF GATE CALL COUNT CALL CNVT ;CONVERT BINARY TO BCD MOVLW 0X30 ;TEST IF 0 XORWF 19,W BTFSS STATUS,Z GOTO KHZ MOVLW 0X32 ;TEST IF < 2 SUBWF 1A,W BTFSC STATUS,C GOTO KHZ MOVLW 0X30 ;TEST IF 0 XORWF 1A,W BTFSS STATUS,Z GOTO XKHZ1 MOVLW 0X30 ;TEST IF 0 XORWF 1B,W BTFSC STATUS,Z GOTO HZ0 XKHZ1: MOVLW 0X82 ;SET DISPLAY ADDRESS CALL INST MOVLW 0X04 ;OUTPUT FIRST 4 CHARACTERS MOVWF COUNT1 MOVLW 0X19 ;MSD OF FREQ MOVWF FSR XKHZ2: MOVLW 0X30 ;TEST IF "0" XORWF INDF,W BTFSS STATUS,Z GOTO XKHZ3 MOVLW 0X20 ;CHANGE PRECEEDING "0'S" TO "SPACE" CALL LCD_OUT INCF FSR ,F DECFSZ COUNT1 ,F GOTO XKHZ2 GOTO XKHZ4 XKHZ3: MOVF INDF,W CALL LCD_OUT INCF FSR ,F DECFSZ COUNT1 ,F GOTO XKHZ3 XKHZ4: MOVLW 0X2E ;"." CALL LCD_OUT MOVF INDF,W ;OUTPUT LAST 3 CHARACTERS CALL LCD_OUT INCF FSR ,F MOVF INDF,W CALL LCD_OUT INCF FSR ,F MOVF INDF,W CALL LCD_OUT MOVLW 0X20 ;"SPACE" CALL LCD_OUT MOVLW 0X4B ;"K" CALL LCD_OUT MOVLW 0X48 ;"H" CALL LCD_OUT MOVLW 0X7A ;"Z" CALL LCD_OUT MOVLW 0X20 ;"SPACE" CALL LCD_OUT MOVLW 0X20 ;"SPACE" CALL LCD_OUT GOTO XKHZ ;----------------------------------- HZ MOVLW 0XC8 ;1 SEC GATE MOVWF GATE CALL COUNT CALL CNVT ;CONVERT BINARY TO BCD MOVLW 0X30 ;TEST IF "0" XORWF 19,W BTFSS STATUS,Z GOTO XKHZ1 MOVLW 0X30 ;TEST IF "0" XORWF 1A,W BTFSS STATUS,Z GOTO XKHZ1 MOVLW 0X32 ;TEST IF < 2 SUBWF 1B,W BTFSC STATUS,C GOTO XKHZ1 HZ0 MOVLW 0X82 ;SET DISPLAY ADDRESS CALL INST MOVLW 0X07 ;OUTPUT FIRST 7 CHARACTERS MOVWF COUNT1 MOVLW 0X19 ;MSD OF FREQ MOVWF FSR HZ1 MOVLW 0X30 ;TEST IF "0" XORWF INDF,W BTFSS STATUS,Z GOTO HZ2 MOVLW 0X20 ;CHANGE PRECEEDING "0'S" TO "SPACE" CALL LCD_OUT INCF FSR ,F DECFSZ COUNT1 ,F GOTO HZ1 GOTO HZ3 HZ2 MOVF INDF,W CALL LCD_OUT INCF FSR ,F DECFSZ COUNT1 ,F GOTO HZ2 HZ3 MOVLW 0X20 ;"SPACE" CALL LCD_OUT MOVLW 0X48 ;"H" CALL LCD_OUT MOVLW 0X7A ;"Z" CALL LCD_OUT MOVLW 0X20 ;"SPACE" CALL LCD_OUT MOVLW 0X20 ;"SPACE" CALL LCD_OUT MOVLW 0X20 ;"SPACE" CALL LCD_OUT MOVLW 0X20 ;"SPACE" CALL LCD_OUT GOTO HZ ;----------------------------------- OVERFLOW: MOVLW 0X01 ;CLEAR DISPLAY CALL INST MOVLW 0X84 ;DISPLAY ADDRESS CALL INST MOVLW 0X4F ;"O" CALL LCD_OUT MOVLW 0X76 ;"V" CALL LCD_OUT MOVLW 0X65 ;"E" CALL LCD_OUT MOVLW 0X72 ;"R" CALL LCD_OUT MOVLW 0X66 ;"F" CALL LCD_OUT MOVLW 0X6C ;"L" CALL LCD_OUT MOVLW 0X6F ;"O" CALL LCD_OUT MOVLW 0X77 ;"W" CALL LCD_OUT MOVLW 0X02 ;CURSOR AT HOME CALL INST GOTO MHZ ;----------------------------------- END