Home » Archimedes archive » Acorn User » AU 1997-11 A.adf » Regulars1 » MikeC/Software/Shift
MikeC/Software/Shift
This website contains an archive of files for the Acorn Electron, BBC Micro, Acorn Archimedes, Commodore 16 and Commodore 64 computers, which Dominic Ford has rescued from his private collection of floppy disks and cassettes.
Some of these files were originally commercial releases in the 1980s and 1990s, but they are now widely available online. I assume that copyright over them is no longer being asserted. If you own the copyright and would like files to be removed, please contact me.
| Tape/disk: | Home » Archimedes archive » Acorn User » AU 1997-11 A.adf » Regulars1 |
| Filename: | MikeC/Software/Shift |
| Read OK: | ✔ |
| File size: | 04EB bytes |
| Load address: | 0000 |
| Exec address: | 0000 |
File contents
; Shift LED pattern
; Set Watchdog Time Out to about 20
LIST P=16C84
;
PORTB EQU 6
TRISB EQU 86H
OPTREG EQU 81H
STATUS EQU 3
CARRY EQU 0
RP0 EQU 5
MSB EQU 7 ;BIT POSITION OF LEFTMOST LED
FUSES EQU H'2007'
;
ORG FUSES
EQUB H'0D'
;
ORG H'00' ; START
CLRF PORTB ;ALL LEDS OFF
BSF STATUS,RP0 ;SELECT REGISTER BANK 1
CLRF TRISB^80H ;SET PORTB TO ALL OUTPUTS
MOVLW 0AH
MOVWF OPTREG^80H ;ASSIGN PRESCALER (1:4) TO WDT
BCF STATUS,RP0 ;SELECT REGISTER BANK 0
INCF PORTB,F ;TURN ON RIGHTMOST LED
BCF STATUS,CARRY ;CLEAR CARRY
LEFT SLEEP ;WAIT FOR WDT TIMEOUT
RLF PORTB,F ;TURN ON LED TO LEFT
BTFSS PORTB,MSB ;REACHED LEFTMOST?
GOTO LEFT ;LOOP IF NOT
RIGHT SLEEP ;WAIT FOR WDT TIMEOUT
RRF PORTB,F ;TURN ON LED TO RIGHT
BTFSS PORTB,0 ;REACHED RIGHTMOST?
GOTO RIGHT ;LOOP IF NOT
GOTO LEFT ;START NEW CYCLE
END
00000000 3b 20 20 53 68 69 66 74 20 4c 45 44 20 70 61 74 |; Shift LED pat| 00000010 74 65 72 6e 0a 3b 20 20 53 65 74 20 57 61 74 63 |tern.; Set Watc| 00000020 68 64 6f 67 20 54 69 6d 65 20 4f 75 74 20 74 6f |hdog Time Out to| 00000030 20 61 62 6f 75 74 20 32 30 0a 20 20 20 20 20 20 | about 20. | 00000040 20 20 4c 49 53 54 20 50 3d 31 36 43 38 34 0a 20 | LIST P=16C84. | 00000050 20 20 3b 0a 20 50 4f 52 54 42 20 20 20 45 51 55 | ;. PORTB EQU| 00000060 20 20 20 20 20 36 20 0a 20 54 52 49 53 42 20 20 | 6 . TRISB | 00000070 20 45 51 55 20 20 20 20 20 38 36 48 0a 20 4f 50 | EQU 86H. OP| 00000080 54 52 45 47 20 20 45 51 55 20 20 20 20 20 38 31 |TREG EQU 81| 00000090 48 0a 20 53 54 41 54 55 53 20 20 45 51 55 20 20 |H. STATUS EQU | 000000a0 20 20 20 33 0a 20 43 41 52 52 59 20 20 20 45 51 | 3. CARRY EQ| 000000b0 55 20 20 20 20 20 30 0a 20 52 50 30 20 20 20 20 |U 0. RP0 | 000000c0 20 45 51 55 20 20 20 20 20 35 0a 20 4d 53 42 20 | EQU 5. MSB | 000000d0 20 20 20 20 45 51 55 20 20 20 20 20 37 20 20 20 | EQU 7 | 000000e0 20 20 20 20 20 20 20 20 20 20 20 20 3b 42 49 54 | ;BIT| 000000f0 20 50 4f 53 49 54 49 4f 4e 20 4f 46 20 4c 45 46 | POSITION OF LEF| 00000100 54 4d 4f 53 54 20 4c 45 44 0a 20 46 55 53 45 53 |TMOST LED. FUSES| 00000110 20 20 20 45 51 55 20 20 20 20 20 48 27 32 30 30 | EQU H'200| 00000120 37 27 0a 0a 20 20 20 3b 0a 20 20 20 0a 20 20 20 |7'.. ;. . | 00000130 20 20 20 20 20 4f 52 47 20 20 20 20 20 46 55 53 | ORG FUS| 00000140 45 53 0a 20 20 20 20 20 20 20 20 45 51 55 42 20 |ES. EQUB | 00000150 20 20 20 48 27 30 44 27 0a 3b 0a 20 20 20 20 20 | H'0D'.;. | 00000160 20 20 20 4f 52 47 20 20 20 20 20 48 27 30 30 27 | ORG H'00'| 00000170 20 20 20 20 20 20 20 20 20 20 20 3b 20 53 54 41 | ; STA| 00000180 52 54 0a 0a 20 20 20 20 20 20 20 20 43 4c 52 46 |RT.. CLRF| 00000190 20 20 20 20 50 4f 52 54 42 20 20 20 20 20 20 20 | PORTB | 000001a0 20 20 20 20 3b 41 4c 4c 20 4c 45 44 53 20 4f 46 | ;ALL LEDS OF| 000001b0 46 0a 20 20 20 20 20 20 20 20 42 53 46 20 20 20 |F. BSF | 000001c0 20 20 53 54 41 54 55 53 2c 52 50 30 20 20 20 20 | STATUS,RP0 | 000001d0 20 20 3b 53 45 4c 45 43 54 20 52 45 47 49 53 54 | ;SELECT REGIST| 000001e0 45 52 20 42 41 4e 4b 20 31 20 20 20 0a 20 20 20 |ER BANK 1 . | 000001f0 20 20 20 20 20 43 4c 52 46 20 20 20 20 54 52 49 | CLRF TRI| 00000200 53 42 5e 38 30 48 20 20 20 20 20 20 20 3b 53 45 |SB^80H ;SE| 00000210 54 20 50 4f 52 54 42 20 54 4f 20 41 4c 4c 20 4f |T PORTB TO ALL O| 00000220 55 54 50 55 54 53 0a 20 20 20 20 20 20 20 20 4d |UTPUTS. M| 00000230 4f 56 4c 57 20 20 20 30 41 48 0a 20 20 20 20 20 |OVLW 0AH. | 00000240 20 20 20 4d 4f 56 57 46 20 20 20 4f 50 54 52 45 | MOVWF OPTRE| 00000250 47 5e 38 30 48 20 20 20 20 20 20 3b 41 53 53 49 |G^80H ;ASSI| 00000260 47 4e 20 50 52 45 53 43 41 4c 45 52 20 28 31 3a |GN PRESCALER (1:| 00000270 34 29 20 54 4f 20 57 44 54 0a 20 20 20 20 20 20 |4) TO WDT. | 00000280 20 20 42 43 46 20 20 20 20 20 53 54 41 54 55 53 | BCF STATUS| 00000290 2c 52 50 30 20 20 20 20 20 20 3b 53 45 4c 45 43 |,RP0 ;SELEC| 000002a0 54 20 52 45 47 49 53 54 45 52 20 42 41 4e 4b 20 |T REGISTER BANK | 000002b0 30 0a 20 20 20 20 20 20 20 20 49 4e 43 46 20 20 |0. INCF | 000002c0 20 20 50 4f 52 54 42 2c 46 20 20 20 20 20 20 20 | PORTB,F | 000002d0 20 20 3b 54 55 52 4e 20 4f 4e 20 52 49 47 48 54 | ;TURN ON RIGHT| 000002e0 4d 4f 53 54 20 4c 45 44 0a 20 20 20 20 20 20 20 |MOST LED. | 000002f0 20 42 43 46 20 20 20 20 20 53 54 41 54 55 53 2c | BCF STATUS,| 00000300 43 41 52 52 59 20 20 20 20 3b 43 4c 45 41 52 20 |CARRY ;CLEAR | 00000310 43 41 52 52 59 0a 4c 45 46 54 20 20 20 20 53 4c |CARRY.LEFT SL| 00000320 45 45 50 20 20 20 20 20 20 20 20 20 20 20 20 20 |EEP | 00000330 20 20 20 20 20 20 3b 57 41 49 54 20 46 4f 52 20 | ;WAIT FOR | 00000340 57 44 54 20 54 49 4d 45 4f 55 54 0a 20 20 20 20 |WDT TIMEOUT. | 00000350 20 20 20 20 52 4c 46 20 20 20 20 20 50 4f 52 54 | RLF PORT| 00000360 42 2c 46 20 20 20 20 20 20 20 20 20 3b 54 55 52 |B,F ;TUR| 00000370 4e 20 4f 4e 20 4c 45 44 20 54 4f 20 4c 45 46 54 |N ON LED TO LEFT| 00000380 0a 20 20 20 20 20 20 20 20 42 54 46 53 53 20 20 |. BTFSS | 00000390 20 50 4f 52 54 42 2c 4d 53 42 20 20 20 20 20 20 | PORTB,MSB | 000003a0 20 3b 52 45 41 43 48 45 44 20 4c 45 46 54 4d 4f | ;REACHED LEFTMO| 000003b0 53 54 3f 0a 20 20 20 20 20 20 20 20 47 4f 54 4f |ST?. GOTO| 000003c0 20 20 20 20 4c 45 46 54 20 20 20 20 20 20 20 20 | LEFT | 000003d0 20 20 20 20 3b 4c 4f 4f 50 20 49 46 20 4e 4f 54 | ;LOOP IF NOT| 000003e0 0a 52 49 47 48 54 20 20 20 53 4c 45 45 50 20 20 |.RIGHT SLEEP | 000003f0 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 00000400 20 3b 57 41 49 54 20 46 4f 52 20 57 44 54 20 54 | ;WAIT FOR WDT T| 00000410 49 4d 45 4f 55 54 0a 20 20 20 20 20 20 20 20 52 |IMEOUT. R| 00000420 52 46 20 20 20 20 20 50 4f 52 54 42 2c 46 20 20 |RF PORTB,F | 00000430 20 20 20 20 20 20 20 3b 54 55 52 4e 20 4f 4e 20 | ;TURN ON | 00000440 4c 45 44 20 54 4f 20 52 49 47 48 54 0a 20 20 20 |LED TO RIGHT. | 00000450 20 20 20 20 20 42 54 46 53 53 20 20 20 50 4f 52 | BTFSS POR| 00000460 54 42 2c 30 20 20 20 20 20 20 20 20 20 3b 52 45 |TB,0 ;RE| 00000470 41 43 48 45 44 20 52 49 47 48 54 4d 4f 53 54 3f |ACHED RIGHTMOST?| 00000480 0a 20 20 20 20 20 20 20 20 47 4f 54 4f 20 20 20 |. GOTO | 00000490 20 52 49 47 48 54 20 20 20 20 20 20 20 20 20 20 | RIGHT | 000004a0 20 3b 4c 4f 4f 50 20 49 46 20 4e 4f 54 0a 20 20 | ;LOOP IF NOT. | 000004b0 20 20 20 20 20 20 47 4f 54 4f 20 20 20 20 4c 45 | GOTO LE| 000004c0 46 54 20 20 20 20 20 20 20 20 20 20 20 20 3b 53 |FT ;S| 000004d0 54 41 52 54 20 4e 45 57 20 43 59 43 4c 45 0a 20 |TART NEW CYCLE. | 000004e0 20 20 20 20 20 20 20 45 4e 44 0a | END.| 000004eb
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