;-------------------------------------------------------------------------;
; A countdown timer for Psychoanalysis ;
; ORIGINAL CODE April '99 Stan Ockers (ockers@anl.gov) ;
; Re-written by Brendon Archibald April 2007 ;
; Optimized for battery operation ;
; Moddified for use in the 16F628A uP - Use internal OSC No XTAL required ;
; My mods mostly have ;* comments original code is just ; ;
; Modifications from original code include: ;
; 1\ Auto restart when reached zero. ;
; 2\ 0 Digit blanking on least significant digits. ;
; 3\ Improved alarm noise by stopping interupts. ;
; 4\ Combined Set and Select switch functions (long press for Set) ;
; Changed set routine, now start button increments digits and ;
; 5\ select button locks in digits. ;
; 6\ Add power off feature combined with Start switch (long press) ;
; 7\ Add 2 min Auto shutdown timer when not counting. ;
; 8\ Whist in power down uP sleeps till start button pressed ;
; 9\ Remove CD4511 from original design - Use retlw table for segments ;
; Counts down from 0-99 min and 1-59 sec giving an alarm at 0 ;
; Initial counts are held in data EEPROM ;
; and can be selected and set with one button ;
; ;
; *RAO-RA3 to bases of NPN transistors connect to cathode's of displays. ;
; **RB0-RB6 to 7segment display digits a, b, c, d, e, f & g. ;
; * RA6 to Decimal Point Anode, Cathode to ground. ;
; RB7 to start pushbutton used to start countdown and power off . ;
; RA4 is an output whilst counting (Active low Open Drain) ;
; RA5 with pull-up resistor goes to PB to select from 15 starting counts ;
; RA7 go's to piezo element via 100r resistor which gives an alarm. ;
;-------------------------------------------------------------------------;
list p=16f628A ; list directive to define processor
#include <p16F628A.inc> ; processor specific variable definitions
errorlevel -302 ; suppress message 302 from list file
__CONFIG _CP_OFF & _DATA_CP_OFF & _LVP_OFF & _BOREN_OFF & _MCLRE_OFF & _WDT_OFF & _PWRTE_ON & _INTOSC_OSC_NOCLKOUT ;* Config's for MPLAB
;-------------------------------------------------------------------------;
; Here we define our own personal registers and give them names ;
; *All moved to 16F6xx register locations* ;
;-------------------------------------------------------------------------;
SEC EQU H'20' ; this register holds the value of seconds
SEC10 EQU H'21' ; holds value of 10's of seconds
MIN EQU H'22' ; holds value of minutes
MIN10 EQU H'23' ; holds value of 10's of minutes
DIGCTR EQU H'24' ; 8 bit counter, only 2 lowest bits actually used
DIGIT EQU H'25' ; hold digit number to access table
INTCNT EQU H'26' ; counts # interrupts to determine when 1 sec up
FUDGE EQU H'27' ; allows slight adjustment every 7 interrupts
RUNFLG EQU H'28' ; bit 0 only, tells if countdown in progress
SECNT EQU H'29' ; used in counting 50, 20 msec delays for 1 sec
CNTMSEC EQU H'2A' ; used in timing of milliseconds
ALARM EQU H'2B' ; bit 0 used as flag for when to alarm, ALSO SETS ALARM LENGTH
DISPSET EQU H'2C' ;* bit 0 tells if in SETDISP and avoid bit blanking routine
NOISELP EQU H'2D' ;* USED FOR NOISE LOOP
BEEPS EQU H'2E' ;* USED FOR NUMBER OF BEEPS
AUTOFF EQU H'2F' ;* USED FOR AUTO OFF TIMER
BEEPDUR EQU H'30' ;* TEMP REG FOR BEEP DURATION
PORTA_TEMP EQU H'31' ;* temporarily holds value of PORTA (MASKED)
DPLATCH EQU H'32' ;* Holds latched value for DP
DPCNT EQU H'33'
W_TEMP EQU H'70' ; temporarily holds value of W
STATUS_TEMP EQU H'71' ; temporarily holds value of STATUS
OFFSET EQU H'72' ; hold offset of address in EEPROM
;-------------------------------------------------------------------------;
; Here we give names to some numbers to make their use more clear ;
;-------------------------------------------------------------------------;
#DEFINE START_PB D'7'
;#DEFINE SET_PB D'6' ;** Delete use of set button on RB6
#DEFINE SELECT_PB D'5'
#DEFINE DP D'6'
#DEFINE RA7 D'7'
#DEFINE OUTPUT D'4'
;#DEFINE RB5 D'5' ;** Not needed anymore
;-------------------------------------------------------------------------;
; We set the start of code to orginate at location zero ;
;-------------------------------------------------------------------------;
ORG 0
GOTO MAIN ; jump to the main routine
NOP
NOP
NOP
GOTO INTERRUPT ; interrupt routine
;-------------------------------------------------------------------------;
;* Lookup table for 7segment display - replaces CD/HEF4511 display driver ; ;
;-------------------------------------------------------------------------;
SEGMENT ADDWF PCL,f ; Bit table data for 7 segment digits
RETLW B'00111111' ; "0" _a_
RETLW B'00000110' ; "1" f| |b
RETLW B'01011011' ; "2" |_g_|
RETLW B'01001111' ; "3" e| |c
RETLW B'01100110' ; "4" |_d_|
RETLW B'01101101' ; "5"
RETLW B'01111101' ; "6" g to a
RETLW B'00000111' ; "7"
RETLW B'01111111' ; "8"
RETLW B'01101111' ; "9"
RETLW B'00000000' ; "10 = blank"
RETLW B'01011100' ; "11 = o"
RETLW B'01110001' ; "12 = F"
RETLW B'01101101' ; "13 = S"
RETLW B'01111001' ; "14 = E"
RETLW B'01110000' ; "15 = t"
;-------------------------------------------------------------------------;
; This table is used to get a bit pattern that will turn on a digit ;
; But only if next segment is not = 0 ie. O bit blanking ;
; Bit blanking not used if in SETDISP routine ie. DISPSET flag set ;
; I know this can be done a better way but it worked so... ;
;-------------------------------------------------------------------------;
BITPAT2 ADDWF PCL,f ;* get bit pattern for transistors - NO BIT BLANKING
RETLW H'01' ;* 0001
RETLW H'02' ;* 0010
RETLW H'04' ;* 0100
RETLW H'08' ;* 1000
BLANK1 MOVF MIN10,f ;* check MIN10 for zero
BTFSS STATUS,Z ;*
SHOWMIN RETLW H'04' ;* 0100
MOVF MIN,f ;* check MIN for zero
BTFSS STATUS,Z
GOTO SHOWMIN ;* NOT 0 SO SHOW BIT
GOTO BLANKDIG ;* MIN10 & MIN = 0 SO BLANK BIT
BLANK2 MOVF MIN10,f ;* check MIN10 for zero
BTFSS STATUS,Z
GOTO SHOWSEC10
MOVF MIN,f ;* check MIN for zero
BTFSS STATUS,Z
SHOWSEC10 RETLW H'02' ;* 0010
MOVF SEC10,f ;* check SEC10 for zero
BTFSS STATUS,Z
GOTO SHOWSEC10 ;* NOT 0 SO SHOW BIT
GOTO BLANKDIG ;* MIN10 & MIN & SEC10 = 0 SO BLANK BIT
BITPAT BTFSC DISPSET,0 ;* If in display set mode
GOTO BITPAT2 ;* then goto BITBAT2 otherwise continue
BITPAT1 ADDWF PCL,f ;* get bit pattern for tranys, 0 turns segment on
SHOWSEC RETLW H'01' ;* 0001 Seconds never blank
GOTO BLANK2 ;* SEC10 digit call - Blank if MIN & SEC10 = 0
GOTO BLANK1 ;* MIN10 digit call - Blank if MIN10 & MIN = 0
MOVF MIN10,f ;* check MIN10 for zero
BTFSS STATUS,Z ;* If MIN10 = 0 Blank MIN10 Segment
SHOWMIN10 RETLW H'08' ;* 1000
BLANKDIG RETLW H'00' ;* 0000 Blank DIGITS if 0
;-------------------------------------------------------------------------;
; Initialization routine sets up ports and timer ;
;-------------------------------------------------------------------------;
INIT CLRF PORTB ; initialize PORTB
CLRF PORTA ; initialize PORTA
MOVLW H'07' ;* 16F6XX Specific - Turn comparators off and
MOVWF CMCON ;* enable pins for I/O functions
BSF STATUS,RP0 ; Select Bank1
MOVLW B'10000000' ; RB7 input all others outputs
MOVWF TRISB ;* Updated command from original code
MOVLW B'00100000' ; Port RA5 input, others outputs
MOVWF TRISA ;* Updated command from original code
MOVLW H'03' ; prescaler on TMR0 and 1:16
MOVWF OPTION_REG ;* write to OPTION register * Updated command
BCF STATUS,RP0 ; back to bank0
MOVLW H'A0' ; GIE & T0IE set T0IF cleared
MOVWF INTCON
MOVLW H'F4' ; initialize INTCNT
MOVWF INTCNT
MOVLW H'06' ; initialize FUDGE
MOVWF FUDGE
CLRF OFFSET ; initialize OFFSET
MOVLW D'122' ;* initialize DPCNT
MOVWF DPCNT ;*
BSF PORTA,OUTPUT ;* Set OUTPUT RA4 (Counting not in Progress)
RETURN
;-------------------------------------------------------------------------;
; This is the interrupt routine that is jumped to when TMR0 overflows ;
;-------------------------------------------------------------------------;
INTERRUPT MOVWF W_TEMP ; save W
SWAPF STATUS,W ; save status
MOVWF STATUS_TEMP ; without changing flags
BCF STATUS,RP0 ; return to bank 0
BCF STATUS,RP1 ; return to bank 0 (shut ric up)
MOVF PORTA,W ;* Save PORTA to w reg
ANDLW B'11010000' ;* Mask off RA7,RA6 & RA4 (Outputs)
MOVWF PORTA_TEMP ;* Save it for later
MOVWF PORTA ;* Load it back into PORTA i.e. blank digits only
INCF DIGCTR,f ; next digit #
MOVF DIGCTR,W ; get it into W
ANDLW H'03' ; mask off 2 lowest bits
MOVWF DIGIT ; save it for later
ADDLW H'20' ;* point at register to display - moved due to 16F6XX
MOVWF FSR ; use as pointer
MOVF INDF,W ; get value of reg pointed to into W
CALL SEGMENT ;* Call segment lookup, return with value in w
MOVWF PORTB ; load w into portb - output to 7seg display's
MOVF DIGIT,W ; recall digit #
CALL BITPAT ;* get bit pattern, return with value in w
ADDWF PORTA_TEMP,W ;*Add bit pattern to PORTA_TEMP keep value in W
MOVWF PORTA ; load w into porta - i.e select segment/ETC
DECFSZ DPCNT,f ;* Decrement and check if DPCNT = 0
GOTO CONTINT ;* Not 0 so continue interrupt
COMF DPLATCH,F ;* Is 0 so invert DPLATCH
;MOVLW D'122' ;* Reset DPCNT
;MOVWF DPCNT ;*
CONTINT DECFSZ INTCNT,f ; finished 1 sec ?
GOTO RESTORE ; not yet, return and enable inter.
CALL EVERYSEC ; go to every second routine
MOVLW H'F4' ; reset INTCNT to normal value
MOVWF INTCNT
DECFSZ FUDGE,f ; time for fudge?
GOTO RESTORE ; not yet, continue on
MOVLW H'06' ; reset FUDGE to 6
MOVWF FUDGE
INCF INTCNT,f ; INTCNT to 245
RESTORE SWAPF STATUS_TEMP,W ; get original status back
MOVWF STATUS ; into status register
SWAPF W_TEMP,f ;* old no flags trick again
SWAPF W_TEMP,W ;* to restore W
BCF INTCON,T0IF ; clear the TMR0 interrupt flag
RETFIE ; finished
;-------------------------------------------------------------------------;
; This routine is called by the interrupt routine every second ;
;-------------------------------------------------------------------------;
EVERYSEC BTFSS RUNFLG,0 ; return if runflg not set
RETURN
BSF DPLATCH,0
MOVLW D'122' ;* Reset DPCNT
MOVWF DPCNT
DECF SEC,f ; decrement seconds digit
INCFSZ SEC,W ; test for underflow
GOTO CKZERO
MOVLW H'09'
MOVWF SEC ; reset sec to 9
DECF SEC10,f ; decrement SEC10
INCFSZ SEC10,W ; check underflow
GOTO CKZERO
MOVLW H'05'
MOVWF SEC10 ; reset SEC10 to 5
DECF MIN,f ; decrement MIN
INCFSZ MIN,W ; check underflow
GOTO CKZERO
MOVLW H'09'
MOVWF MIN ; reset MIN to 9
DECF MIN10,f ; decrement MIN10
CKZERO MOVF SEC,f ; test SEC for zero
BTFSS STATUS,Z
RETURN
MOVF SEC10,f ; check SEC10 for zero
BTFSS STATUS,Z
RETURN
MOVF MIN,f ; check MIN for zero
BTFSS STATUS,Z
RETURN
MOVF MIN10,f ; check MIN10 for zero
BTFSS STATUS,Z
RETURN
CLRF RUNFLG ; stop the countdown
BCF PORTA,DP ;* clear decimal point
BSF ALARM, 0 ; set the alarm flag
RETURN
;-------------------------------------------------------------------------;
; This routine is called by the MAINLOOP to set or clear the DP ;
;-------------------------------------------------------------------------;
DPSET BTFSC DPLATCH,0 ;* Test DPLATCH bit0
GOTO DPOFF ;* If 0 clear decimal point
BSF PORTA,DP ;* If 1 turn on decimal point
RETURN
DPOFF BCF PORTA,DP ;* TURN OFF decimal point
RETURN
;-------------------------------------------------------------------------;
; This is a routine to read a byte from the data EEPROM ;
;-------------------------------------------------------------------------;
READEE BSF STATUS,RP0 ;* change to bank 1 - needed it
MOVWF EEADR ; set up eeprom address from W
BSF EECON1,RD ; set the read bit
MOVF EEDATA,W ; return value in W
BCF STATUS,RP0 ;* back to bank 0
RETURN
;-------------------------------------------------------------------------;
; This routine fills the display registers from data EEPROM ;
;-------------------------------------------------------------------------;
GETEE MOVLW H'01' ; EEprom location 1 +
ADDWF OFFSET,W ; offset from start
CALL READEE ; into W
MOVWF SEC ; into SEC register
MOVLW H'02' ; location 2 +
ADDWF OFFSET,W ; offset from start
CALL READEE ; into W
MOVWF SEC10 ; into SEC10 register
MOVLW H'03' ; location 3 +
ADDWF OFFSET,W ; offset from start
CALL READEE ; into W
MOVWF MIN ; into MIN register
MOVLW H'04' ; location 4 +
ADDWF OFFSET,W ; offset from start
CALL READEE ; into W
MOVWF MIN10 ; into MIN10 register
RETURN
;-------------------------------------------------------------------------;
; This routine writes a byte to data EEPROM ;
;-------------------------------------------------------------------------;
WRITECHK BCF INTCON,GIE ; clear GIE, disable interrupts
WRITEEE BTFSC INTCON,GIE ;* Check if interrupt is disabled
GOTO WRITECHK ;* If not disabled then do so
BSF STATUS,RP0 ; Change to bank1
CLRF EECON1
BSF EECON1,WREN ; enable write
MOVLW H'55' ; magic sequence
MOVWF EECON2
MOVLW H'AA'
MOVWF EECON2
BSF EECON1,WR ;* Write data to EEPROM
EELOOP BTFSC EECON1,WR ; wait for WR to go low i.e. Finished write
GOTO EELOOP ; not yet check again
BCF EECON1,WREN ;* Finished write, disable write enable
BCF EECON1,EEIF ; clear the interrupt flag
BCF STATUS,RP0 ; return to bank0
BSF INTCON, GIE ; re-enable interrupts
RETURN
;-------------------------------------------------------------------------;
; This routine puts display registers into data EEPROM ;
;-------------------------------------------------------------------------;
PUTEE
MOVF SEC,W
BSF STATUS,RP0 ;* change to bank 1 to make it work
MOVWF EEDATA
MOVLW H'01' ; EEPROM location 1 +
ADDWF OFFSET,W ; offset from start
MOVWF EEADR
CALL WRITEEE ; put SEC digit into EEprom
MOVF SEC10,W
BSF STATUS,RP0 ;* change to bank 1 to make it work
MOVWF EEDATA
MOVLW H'02' ; EEPROM location 2 +
ADDWF OFFSET,W ; offset from start
MOVWF EEADR
CALL WRITEEE ; put SEC10 digit into EEprom
MOVF MIN,W
BSF STATUS,RP0 ;* change to bank 1 to make it work
MOVWF EEDATA
MOVLW H'03' ; EEPROM location 3 +
ADDWF OFFSET,W ; offset from start
MOVWF EEADR
CALL WRITEEE ; put MIN digit into EEprom
MOVF MIN10,W
BSF STATUS,RP0 ;* change to bank 1 to make it work
MOVWF EEDATA
MOVLW H'04' ; EEPROM location 4 +
ADDWF OFFSET,W ; offset from start
MOVWF EEADR
CALL WRITEEE ; put MIN10 digit into EEprom
RETURN
;-------------------------------------------------------------------------;
; This is the main routine, the program starts here ;
;-------------------------------------------------------------------------;
MAIN CALL INIT ; set up ports etc.
;-------------------------------------------------------------------------;
; We will return to this point when alarm is shut off. ;
;-------------------------------------------------------------------------;
EE2D CALL GETEE ; put eeprom in display regs.
BCF RUNFLG, 0 ; clear run flag so no countdown
BCF ALARM, 0 ; clear alarm flag
BCF DISPSET,0 ;* Initialise DISPSET flag (Enable Blanking)
CALL WAITSTARTUP ; wait till no switches pressed
CALL WAITSELECT
;-------------------------------------------------------------------------;
; This loop checks for either pushbutton and acts accordingly ;
; If however no switches are pressed for over a preset time call the ;
; SHUTOFF routine. ;
;-------------------------------------------------------------------------;
; Setup AUTOFF TIMEOUT with interrupt gives 2 min delay
KEYCHKLOOP MOVLW H'78' ;* 120 INTO AUTO OFF COUNTER
MOVWF AUTOFF ;* 120 X .8SEC = 96sec BEFORE AUTO OFF
MOVLW H'C8' ;* 200 INTO FIRST COUNTER
MOVWF SECNT ;* 200 X 4MSEC = .8SEC or so
AUTOFFLOOP MOVLW H'04' ;* 4MSEC DELAY
CALL NMSEC
BTFSS PORTB,START_PB ; check for start pressed
GOTO STARTLONG ;* yes, check for long press
BTFSS PORTA,SELECT_PB ; No, check select pushbutton pressed
GOTO SELLONG ;* yes, check for long press.
DECFSZ SECNT,f ;* no switches, decrement secnt, check for 0
GOTO AUTOFFLOOP ;* secnt not 0 so loop
DECFSZ AUTOFF,f ;* secnt is 0, decrement autoff, check for 0
GOTO AUTOFFLOOP ;* autoff not 0 so loop
GOTO SHUTOFF ;* autoff is 0 so GOTO SHUTOFF
;-------------------------------------------------------------------------;
; Long Start press routine - If short press then skip to STARTCNT if long ;
; then blank display, stop interrupts and SLEEP till start pressed again. ;
; Upon Start press restart interupts and goto EE2D i.e. LIKE POWER UP
;-------------------------------------------------------------------------;
STARTLONG MOVLW H'23' ;* 35 DELAYS
MOVWF SECNT ;* INTO SECNT REGISTER
STARTLOOP CALL DLY20 ;* CALL 20 MSEC DELAY
BTFSC PORTB,START_PB ;* Check, START BUTTON
GOTO STARTCNT ;* IF IT IS (i.e SHORT PRESS) START COUNT
DECFSZ SECNT,f ;* IF NOT DECREMENT SECNT AND CHECK IF IT REACHES ZERO
GOTO STARTLOOP ;* IF IT HASNT GO AND CHECK BUTTON AGAIN
CALL SHORTBEEP ;* Make a small noise
SHUTOFF MOVLW H'0A' ;* IF THE START BUTTON IS STILL DOWN AFTER 35 LOOPS
MOVWF MIN10 ;* Blank 10's of minutes,
MOVLW H'0B' ;* put a o in
MOVWF MIN ;* minutes
MOVLW H'0C' ;* Put an "F" in
MOVWF SEC10 ;* 10's of seconds
MOVWF SEC ;* and seconds
CALL WAITSTARTUP
MOVLW H'02' ;* NUMBER OF BEEPS
MOVWF BEEPS ;* LOAD 5 INTO BEEPS
MOVLW H'02' ;* duration of beeps
MOVWF BEEPDUR ;* ETC
CLRF PORTB
CALL BEEP ;* CALL BEEP
MOVLW D'250'
CALL NMSEC
BCF INTCON, GIE ;* COME BACK FROM BEEP - DISABLE INTERUPTS
CLRF PORTB
MOVLW B'00010000' ;* select transistors - i.e. ALL OFF
MOVWF PORTA ;*
MOVLW H'08' ;* Set INTCON RBIE - wake on PORTB
MOVWF INTCON ;* Also GIE & T0IE & T0IF cleared
CLRF TMR0 ;* and clear timer 0 - SOUNDED LIKE A GOOD IDEA?
SLEEP ;* Goto sleep, wait for button
NOP ;* Required delay?
;BCF INTCON, RBIF ;* DIDNT WORK AND DIDNT SEEM TO NEED IT??
CALL SHORTBEEP ;* Make a small noise
MOVLW H'A0' ;* WAKE UP - GIE & T0IE set T0IF cleared
MOVWF INTCON ;* i.e. restart interupts
GOTO EE2D ;* Reload last eeprom & wait for start etc
;-------------------------------------------------------------------------;
; If start key has been pressed then start countdown process, ;
; I initially released this code with only the setting of the ;
; run flag included. If you think about it you must also reset ;
; TMR0 to zero. TMR0 is free running and could have any value ;
; 0-255 when the button in pressed. Also INTCNT has to be ;
; initialized because the previous count could have been cancelled. ;
;-------------------------------------------------------------------------;
STARTCNT CALL SHORTBEEP ;* Make a small noise
CALL WAITSTARTUP ; wait for release of start key
SUBSTART MOVLW D'244' ; reset INTCNT
MOVWF INTCNT
CLRF DPLATCH ; reset DPLATCH
CLRF TMR0 ; and clear timer 0
BSF RUNFLG, 0 ; start the countdown
;BCF PORTA,OUTPUT ;* Clear OUTPUT RA4 (Counting in Progress)
;-------------------------------------------------------------------------;
; Once started just loop looking for cancel or reaching 0000 ;
;-------------------------------------------------------------------------;
MAINLOOP BTFSS PORTB,START_PB ; countdown in progress, check start
GOTO STOPCNT ; Yes, Stop count
CALL DPSET ;* No start switch, Set or clear decimal point
BTFSS ALARM, 0 ; Reached 0000 yet?
GOTO MAINLOOP ; no, ALARM = 0 continue looping
BCF INTCON, GIE ; yes, ALARM = 1 disable interrupts
BCF PORTA,DP ;* Clear decimal point
BSF PORTA,OUTPUT ;* Set OUTPUT RA4 (Counting not in Progress)
CALL SOUNDALARM ; CALL SOUNDALARM routine and come back
BSF INTCON, GIE ; RE-ENABLE interrupts
CALL GETEE ; put eeprom in display regs.
BCF ALARM, 0 ; clear alarm flag
GOTO SUBSTART ; ***Auto Restart triger point***
STOPCNT BCF PORTA,DP ;* Clear decimal point
;BSF PORTA,OUTPUT ;* Set OUTPUT RA4 (Counting not in Progress)
CALL SHORTBEEP ;* Make a small noise
GOTO EE2D
;-------------------------------------------------------------------------;
; This code sounds the alarm ;
; Produces 1 long 1KHz tone at end of time out - ;
;-------------------------------------------------------------------------;
SOUNDALARM MOVLW B'00111111' ;* LOAD a "0" ONTO SEGMENTS
MOVWF PORTB ;* Load into PORTB
MOVLW H'01' ;* NUMBER OF BEEPS
MOVWF BEEPS
MOVLW H'14' ; ? delays of ? msec = ?sec or so into BEEPDUR reg
MOVWF BEEPDUR
BEEP BCF INTCON, GIE ;* DISABLE INTERUPTS T0 CLEAN UP SOUND
BEEP2 MOVFW BEEPDUR ;* LOAD BEEPDUR INTO W
MOVWF ALARM ; LOAD W INTO ALARM REG - lazy and use ALARM reg for tone duration
NOISE MOVLW H'FF' ; 255 delays of 400 usec = 954usec or so
MOVWF NOISELP ; into NOISELP register
NOISELOOP MOVF PORTA,W
ANDLW B'11010000'
XORLW B'10000000' ;* TOGGLE PORTA RA7 (Buzzer)
MOVWF PORTA
MOVLW H'08' ; delay 8x10=80 microseconds (Freq of buzz)
CALL N10USEC
INCF DIGCTR,f ;* If RA7 is a 0 increment digit #
MOVF DIGCTR,W ;* get it into W
ANDLW H'03' ;* mask off 2 lowest bits
CALL BITPAT2 ;* get bit pattern for transistors
ADDWF PORTA,f ;* As a result gives basic multiplex display
DIGDIS DECFSZ NOISELP,f ; finished delay?
GOTO NOISELOOP ;* NO - DO IT AGAIN
DECFSZ ALARM,f ; Check alarm reg for 0, decrement if not
GOTO NOISE ;* and loop
MOVLW B'00010000' ;* select transistors - i.e. ALL OFF
MOVWF PORTA ;*
MOVLW H'C8' ;* DELAY BETWEEN BEEPS
CALL NMSEC ;*
DECFSZ BEEPS,f
GOTO BEEP2
STOPBEEP BSF INTCON, GIE ; RE-ENABLE interrupts
RETURN
SHORTBEEP MOVLW D'100' ; 100 delays of 80usec = 8msec or so
MOVWF NOISELP
BEEPLOOP MOVLW B'10000000' ;* XOR (TOGGLE) RA7
XORWF PORTA,1
MOVLW H'08' ; delay 8x10=80 microseconds (Freq of buzz)
CALL N10USEC
DECFSZ NOISELP,f ; finished delay?
GOTO BEEPLOOP ;* NO - DO IT AGAIN
BCF PORTA,RA7 ;* YES BEEP PROCESS FINISHED CLEAR SPEAKER PIN
RETURN ;* GO BACK
;-------------------------------------------------------------------------;
; Wait for release of start button ;
;-------------------------------------------------------------------------;
WAITSTARTUP BTFSS PORTB,START_PB ; wait for release
GOTO WAITSTARTUP ; not released yet
CALL DLY20 ; debounce release
BTFSS PORTB,START_PB ; 2nd check, make sure released
GOTO WAITSTARTUP ; keep checking
RETURN
;-------------------------------------------------------------------------;
; Wait for release of select button ;
;-------------------------------------------------------------------------;
WAITSELECT BTFSS PORTA,SELECT_PB ; wait for release
GOTO WAITSELECT ; not yet
CALL DLY20 ; debounce release
BTFSS PORTA,SELECT_PB ; 2nd check, make sure released
GOTO WAITSELECT ; keep checking
RETURN
;-------------------------------------------------------------------------;
; Routine to follow sets the countdown time digit by digit ;
;-------------------------------------------------------------------------;
SETDISP2 BSF DISPSET, 0 ;* set the DISPSET flag - Disable bitblanking
MOVLW H'0A' ; put 10 in
MOVWF MIN10 ; 10's of minutes
MOVLW D'13' ; put S in
MOVWF MIN ; minutes
MOVLW D'14' ; put E in
MOVWF SEC10 ; 10's of seconds
MOVLW D'15' ; put t in
MOVWF SEC ; seconds
CALL SHORTBEEP ;* Make a small noise
CALL WAITSELECT
MOVLW H'0A' ; put 10 in digits, (no display)
MOVWF MIN ; minutes
MOVWF SEC10 ; 10's of seconds
MOVWF SEC ; seconds
STARTMIN10 CLRF MIN10 ; 0 now in MIN10
CALL WAITSELECT ;*
WAIT1 BTFSS PORTB,START_PB ; set key pressed?
GOTO MOREMIN10 ;*
BTFSS PORTA,SELECT_PB ;*
GOTO SETMIN ; yes MIN10 now set
GOTO WAIT1
MOREMIN10 CALL SHORTBEEP ;* Make a small noise
CALL WAITSTARTUP ; wait for release of set key
INCF MIN10,f ; every increment 10's MIN
MOVLW H'0A' ; reached 10?
SUBWF MIN10,W
BTFSC STATUS,Z ; Z set if reached 10
GOTO STARTMIN10 ; start again with 0
GOTO WAIT1 ; Check buttons again
SETMIN CALL SHORTBEEP ;* Make a small noise
STARTMIN CLRF MIN ; 0 into MIN
CALL WAITSELECT
WAIT2 BTFSS PORTB,START_PB ;*
GOTO MOREMIN
BTFSS PORTA,SELECT_PB ;*
GOTO SETSEC10 ;* yes, finished with MIN
GOTO WAIT2 ; Check buttons again
MOREMIN CALL SHORTBEEP ;* Make a small noise
CALL WAITSTARTUP ;*
INCF MIN,f ; every second increment MIN
MOVLW H'0A' ; reached 10?
SUBWF MIN,W
BTFSC STATUS,Z ; Z set if reached 10
GOTO STARTMIN ; put zero in if Z set
GOTO WAIT2 ; Check buttons again
SETSEC10 CALL SHORTBEEP ;* Make a small noise
STARTSEC10 CLRF SEC10 ; 0 into SEC10
CALL WAITSELECT ;*
WAIT3 BTFSS PORTB,START_PB ;*
GOTO MORESEC10 ;* yes quit incrementing
BTFSS PORTA,SELECT_PB ;*
GOTO SETSEC
GOTO WAIT3 ; continue wait
MORESEC10 CALL SHORTBEEP ;* Make a small noise
CALL WAITSTARTUP ;*
INCF SEC10,f ; every second increment 10's SEC
MOVLW H'06' ; reached 6?
SUBWF SEC10,W
BTFSC STATUS,Z ; Z set if reached 6
GOTO STARTSEC10 ; put zero in if Z set
GOTO WAIT3 ; Check buttons again
SETSEC CALL SHORTBEEP ;* Make a small noise
STARTSEC CLRF SEC
CALL WAITSELECT
;-------------------------------------------------------------------------;
; Subroutine to avoid a set time of 0000 ;
;-------------------------------------------------------------------------;
MOVF MIN10,f ; check MIN10 for zero
BTFSS STATUS,Z
GOTO WAIT4 ; Zero SEC reg and continue increment
MOVF MIN,f ; check MIN for zero
BTFSS STATUS,Z
GOTO WAIT4 ; Zero SEC reg and continue increment
MOVF SEC10,f ; check SEC10 for zero
BTFSS STATUS,Z
GOTO WAIT4 ; Zero SEC reg and continue increment
INCF SEC,f ; Put 1 in SEC reg and continue increment
WAIT4 BTFSS PORTB,START_PB ;*
GOTO MORESEC ;* yes finished setting digits
BTFSS PORTA,SELECT_PB ;*
GOTO FINSET ;* yes finished setting digits
GOTO WAIT4 ; continue wait
MORESEC CALL SHORTBEEP ;* Make a small noise
CALL WAITSTARTUP ;*
INCF SEC,f ;* increment SEC
MOVLW H'0A' ; reached 10?
SUBWF SEC,W
BTFSC STATUS,Z ; Z set if reached 10
GOTO STARTSEC ; Return to STARTSEC and start again
GOTO WAIT4 ; Not 10 continue to increment
FINSET CALL SHORTBEEP ;* Make a small noise
MOVLW D'100'
CALL NMSEC
CALL SHORTBEEP ;* Make a small noise
CALL WAITSELECT ;*
CALL PUTEE ; put new digits into EEPROM
BCF DISPSET, 0 ;* CLEAR the DISPSET flag - Enable bitblanking
GOTO KEYCHKLOOP ; start checking buttons again
;-------------------------------------------------------------------------;
; Selects starting count by incrementing OFFSET ;
;-------------------------------------------------------------------------;
SELLONG MOVLW H'23' ;* 700msec delay
MOVWF SECNT ;*
SELLOOP CALL DLY20 ;*
BTFSC PORTA,SELECT_PB ;* wait for release
GOTO SETSELECT ;* is released - (short press)
DECFSZ SECNT,f ;* not released, decrement SECNT check if 0
GOTO SELLOOP ;* not 0 do it again
GOTO SETDISP2 ;* is 0 (long press)
SETSELECT CALL SHORTBEEP
MOVLW D'4' ; offset up 4
ADDWF OFFSET,F ; next offset position
MOVLW D'60' ; reached 16th yet?
SUBWF OFFSET,W ; will give zero if yes
BTFSC STATUS,Z ; skip if not 64
CLRF OFFSET ; reset position to zero
;MOVLW 0 ; EEPROM location (LEFT ALL THIS OUT)
;MOVWF EEADR ; set up address (BECAUSE IT DIDNT WORK)
;MOVF OFFSET,W ; offset # into W (AND I FIGURED, OFFSET)
;MOVWF EEDATA ; set up data (WASNT CHANGED AFTER POWER UP)
;BCF INTCON,GIE ; clear GIE, disable interrupts (AND IT WOULD WEAR)
;CALL WRITEEE ; save # in location 0 (OUT EEPROM, AS I)
;BSF INTCON,GIE ; re-enable interrupts (WAS HAPPY TO HAVE)
CALL GETEE ; get new start count into display (LAST SETTING)
CALL WAITSELECT ; make sure select switch is up (TO LEAVE IT OUT)
GOTO KEYCHKLOOP ; start checking buttons again
;-------------------------------------------------------------------------;
; The following are various delay routines based on instruction length. ;
; The instruction length is assumed to be 1 microsecond (4Mhz crystal). ;
;-------------------------------------------------------------------------;
DLY20 MOVLW D'20' ; delay for 20 milliseconds
;*** N millisecond delay routine ***
NMSEC MOVWF CNTMSEC ; delay for N (in W) milliseconds
MSECLOOP MOVLW D'248' ; load takes 1 microsec
CALL MICRO4 ; by itself CALL takes ...
; 2 + 247 X 4 + 3 + 2 = 995
NOP ; 1 more microsec
DECFSZ CNTMSEC,f ; 1 when skip not taken, else 2
GOTO MSECLOOP ; 2 here: total 1000 per msecloop
RETURN ; final time through takes 999 to here
; overhead in and out ignored
;*** 1 millisecond delay routine ***
ONEMSEC MOVLW D'249' ; 1 microsec for load W
; loops below take 248 X 4 + 3 = 995
MICRO4 ADDLW H'FF' ; subtract 1 from 'W'
BTFSS STATUS,Z ; skip when you reach zero
GOTO MICRO4 ; loops takes 4 microsec, 3 for last
RETURN ; takes 2 microsec
; call + load W + loops + return =
; 2 + 1 + 995 + 2 = 1000 microsec
;*** N 10 microsecond delay routine ***
N10USEC MOVWF CNTMSEC ;* delay for N (in W) milliseconds
USECLOOP MOVLW D'1' ;* load takes 1 microsec
CALL MICRO4 ;* by itself CALL takes ...
;* 1 + 4 + 3 + 2 = 10
DECFSZ CNTMSEC,f ;* 1 when skip not taken, else 2
GOTO USECLOOP ;* 2 here: total 10 per usecloop
RETURN ;* final time through takes 9 to here
;* overhead in and out ignored
;-------------------------------------------------------------------------;
; Here we set up the initial values of the digits in data EEPROM ;
;-------------------------------------------------------------------------;
ORG H'2100'
DE 0, 0, 0, 1, 0 ; 1st starting # (Should be 1 minute)
DE 0, 0, 2, 0 ; 2nd starting # (Should be 2 minutes)
DE 0, 0, 3, 0 ; 3rd starting # (Should be 3 minutes)
DE 0, 0, 4, 0 ; 4th starting # (Should be 4 minutes)
DE 0, 0, 5, 0 ; 5th starting # (Should be 5 minutes)
DE 0, 0, 6, 0 ; 6th starting # 6 min
DE 0, 0, 7, 0 ; 7th starting # 7 min
DE 0, 0, 8, 0 ; 8th starting # 8 min
DE 0, 0, 9, 0 ; 9th starting # 9 min
DE 0, 0, 0, 1 ; 10th starting # 10 min
DE 0, 0, 0, 2 ; 11th starting # 20 min
DE 0, 0, 0, 3 ; 12th starting # 30 min
DE 0, 0, 0, 4 ; 13th starting # 40 min
DE 0, 0, 0, 5 ; 14th starting # 50 min
DE 0, 0, 0, 6 ; 15th starting # 60 min
END
| file: /Techref/microchip/cntdn/cntdwn_16F628no4511_V3.asm, 39KB, , updated: 2007/4/3 17:55, local time: 2024/11/8 15:50,
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