ididntdoit
Apr 18th, 2009, 09:56 PM
I'm working on a school project and I'm just trying to enhance the code now for my own enjoyment and the problem that I'm having is that whenever a variable becomes larger then 32 (hexadecimal), the PIC project seems to just freeze. What is being done is a 'picture' is stored in 1s and 0s (1 will mean an of LED, 0 means on) with one group of 8 (a byte) being one line of the picture (the output is on an 8x8 LED matrix). Since what I'm drawing is longer than 8 lines (69h actually), there is a scrolling function written. The original program had a 16 line image scroll by. This looping function works great until I try to go past 32h. Then it seems to just freeze. Here is the code I have now:
TITLE "98-0380-AUS-P (picxie2) V1.00 - (C) 1998 Lewin Edwards (sysadm@zws.com)"
INCLUDE "P16F84.INC"
LIST P=16F84
__CONFIG B'11111111110001' ;All protection off, powerup timer on, WDT off, XT osc
;--------------------------------------------------------------------------
; Behavioral constants
DEFAULT_MULTIPLEX_RATE EQU H'50' ;Multiplex speed. Probably don't need to modify this.
DEFAULT_FRAME_RATE EQU H'20' ;Default number of times to display frame
SCREEN_HEIGHT EQU H'08' ;Number of lines on screen
SCREEN_WIDTH EQU H'08' ;Number of columns on screen
NUMBER_OF_LINES EQU H'30' ;Number of lines of text to display
REPEATS_DONE EQU H'02' ;Number of times to do the number of lines given
..
..
..
..
..
;---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
; SUBROUTINE Rotate screen buffer UP one line (top line of
; offscreen buffer becomes bottom line of onscreen)
; Scratch0 - line counter
; Scratch1 - swap holding register
;---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
RotateUp MOVLW NUMBER_OF_LINES*REPEATS_DONE
MOVWF Scratch0
; Setup destination pointer
MOVLW Screen0+1
MOVWF FSR
; Save the top line of the display
MOVF Screen0,0
MOVWF Scratch1
RULoop MOVF INDF,0 ;get line
DECF FSR,1 ;locate destination
MOVWF INDF ;put line data in new location
INCF FSR,1 ;locate next line source
INCF FSR,1
DECFSZ Scratch0,1
GOTO RULoop
MOVLW NUMBER_OF_LINES
MOVWF Scratch0
DECFSZ REPEATS_DONE,1
GOTO RULoop
MOVLW NUMBER_OF_LINES
MOVLW H'02'
MOVWF REPEATS_DONE
; Restore the top line of the display (now the bottom line)
MOVF Scratch1,0
MOVWF Screen0+NUMBER_OF_LINES*REPEATS_DONE
You'll notice that I have tried to get around this by only making the NUMBER_OF_LINES 32h, and then repeating that 32h REPEATS_DONE times. This does not freeze, it simply starts showing fully ON lines.
Can anyone show me how to make a variable (maybe the INDF pointer is the problem) go above 32h?
Thanks!:D
TITLE "98-0380-AUS-P (picxie2) V1.00 - (C) 1998 Lewin Edwards (sysadm@zws.com)"
INCLUDE "P16F84.INC"
LIST P=16F84
__CONFIG B'11111111110001' ;All protection off, powerup timer on, WDT off, XT osc
;--------------------------------------------------------------------------
; Behavioral constants
DEFAULT_MULTIPLEX_RATE EQU H'50' ;Multiplex speed. Probably don't need to modify this.
DEFAULT_FRAME_RATE EQU H'20' ;Default number of times to display frame
SCREEN_HEIGHT EQU H'08' ;Number of lines on screen
SCREEN_WIDTH EQU H'08' ;Number of columns on screen
NUMBER_OF_LINES EQU H'30' ;Number of lines of text to display
REPEATS_DONE EQU H'02' ;Number of times to do the number of lines given
..
..
..
..
..
;---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
; SUBROUTINE Rotate screen buffer UP one line (top line of
; offscreen buffer becomes bottom line of onscreen)
; Scratch0 - line counter
; Scratch1 - swap holding register
;---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
RotateUp MOVLW NUMBER_OF_LINES*REPEATS_DONE
MOVWF Scratch0
; Setup destination pointer
MOVLW Screen0+1
MOVWF FSR
; Save the top line of the display
MOVF Screen0,0
MOVWF Scratch1
RULoop MOVF INDF,0 ;get line
DECF FSR,1 ;locate destination
MOVWF INDF ;put line data in new location
INCF FSR,1 ;locate next line source
INCF FSR,1
DECFSZ Scratch0,1
GOTO RULoop
MOVLW NUMBER_OF_LINES
MOVWF Scratch0
DECFSZ REPEATS_DONE,1
GOTO RULoop
MOVLW NUMBER_OF_LINES
MOVLW H'02'
MOVWF REPEATS_DONE
; Restore the top line of the display (now the bottom line)
MOVF Scratch1,0
MOVWF Screen0+NUMBER_OF_LINES*REPEATS_DONE
You'll notice that I have tried to get around this by only making the NUMBER_OF_LINES 32h, and then repeating that 32h REPEATS_DONE times. This does not freeze, it simply starts showing fully ON lines.
Can anyone show me how to make a variable (maybe the INDF pointer is the problem) go above 32h?
Thanks!:D