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xIII
Registered: Nov 2008
Posts: 210 |
KickAss coding question
If I use a for loop and load a value from a table which is stored to a label inside the for loop the value is always the first value of the table ?
just an example:
.for (var i=0; i<38; i++) {
lda valuefromtable+i
sta store+1
store:
lda #$00
sta $d020
}
rts
valuefromtable: .byte 0,1,2,3,4,5,6,7,8,9,10
Question: how can this be solved ? or what am I doing wrong ? |
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Cruzer
Registered: Dec 2001
Posts: 1048 |
This should work. Maybe the issue is that there's only 11 elements in the table, but 38 loop iterations. |
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xIII
Registered: Nov 2008
Posts: 210 |
@CRUZER: it's just an example ofcourse :) but even if you add more values to the table it doesn't work :(
This is what I get (in vice monitor):
.C:6000 AD A3 61 LDA $61A3
.C:6003 8D 07 60 STA $6007
.C:6006 A9 00 LDA #$00
.C:6008 8D 20 D0 STA $D020
.C:600b AD A4 61 LDA $61A4
.C:600e 8D 12 60 STA $6012
.C:6011 A9 00 LDA #$00
.C:6013 8D 20 D0 STA $D020
.C:6016 AD A5 61 LDA $61A5
.C:6019 8D 1D 60 STA $601D
.C:601c A9 00 LDA #$00
.C:601e 8D 20 D0 STA $D020
.C:6021 AD A6 61 LDA $61A6
.C:6024 8D 28 60 STA $6028
.C:6027 A9 00 LDA #$00
.C:6029 8D 20 D0 STA $D020
.C:602c AD A7 61 LDA $61A7
.C:602f 8D 33 60 STA $6033
.C:6032 A9 00 LDA #$00
.C:6034 8D 20 D0 STA $D020
.C:6037 AD A8 61 LDA $61A8
.C:603a 8D 3E 60 STA $603E
.C:603d A9 00 LDA #$00
.C:603f 8D 20 D0 STA $D020
... |
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Burglar
Registered: Dec 2004
Posts: 1031 |
the result you got is correct. what are you trying to achieve? |
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Nith
Registered: Jan 2013
Posts: 15 |
For me it doesn' t make much sense to mix the self modification of the code with it's actual execution.. You could just leave out the sta store+1 and the lda #$00 and you will get the same result with less code |
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Dr.Science
Registered: Oct 2011
Posts: 39 |
I think xIII wants to get directly something like this as result:
LDA #$00
STA $d020
LDA #$01
STA $d020
LDA #$02
STA $d020
LDA #$03
STA $d020
etc. etc.
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Knut Clausen
Registered: Apr 2013
Posts: 18 |
My guess is that you need to have another look at how the kickassembler preprocessing works. Once you do that, your output will make sense.
I'm not sure what you want to accomplish, but here are two possible solutions.
1: Load numbers by memory reference:
.for (var i=0; i<11; i++) {
lda valuefromtable+i
sta $d020
}
rts
valuefromtable: .byte 0,1,2,3,4,5,6,7,8,9,10
2: Load numbers by actual value:
.var colorsList = List()
.eval colorsList.add(0,1,2,3,4,5,6,7,8,9,10 )
.for (var i=0; i<colorsList.size(); i++) {
lda # colorsList.get(i)
sta $d020
}
rts |
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Oswald
Registered: Apr 2002
Posts: 5017 |
or how the big boys do it:
lda #<speed
sta fc
lda #>speed
sta fd
lda #$00
sta i
loop
ldx i
lda table,x
sta mod+1
ldy #$00
copy
lda sample,y
sta (fc),y
iny
cpy #end-start
bne copy
tya
clc
adc fc
sta fc
bcc *+4
inc fd
inc y
lda y
cmp #38
bne loop
ldy #$00
lda #$60
sta (fc),y
rts
sample
start
mod lda #$00
sta $d020
end
table .byte 0,1,2,3,4,5,6,7 |
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Cruzer
Registered: Dec 2001
Posts: 1048 |
xIII: The result you get in the Vice monitor seems correct. My guess is now that the code hasn't been executed yet, and the values from the table therefore haven't been copied to the lda's. |
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Oswald
Registered: Apr 2002
Posts: 5017 |
the first problem that we dont even know whats the problem...
I think kickass is to be used by experienced programmers (such as myself), if you cant write the code generator in native assembly its not for you.
inc i instead of inc y btw. |
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Ash Checksum
Registered: Nov 2013
Posts: 6 |
Word. I think also cars should be only used by people who can build an engine. |
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Mixer
Registered: Apr 2008
Posts: 422 |
Quote: Word. I think also cars should be only used by people who can build an engine.
I like that sentence, because it is so true. |
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Oswald
Registered: Apr 2002
Posts: 5017 |
if you dont learn your shit, then you will end up putting up questions like the above.
especially the dissassembly, and not understanding kickass did exactly what he was asking for is like a disaster. its not like he cant build an engine, he doesnt even knows which pedal does what. |
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xIII
Registered: Nov 2008
Posts: 210 |
@Cruzer/Burglar: I was expecting a different value after LDA when I checked the result of the parsing by Kickass. But I know now that the code is OK once I run it!
Just add this question to the list: 'stupid coding questions by xIII' ;)
Knut: thanks
Nith: it was just a fast example.
Oswald: Maybe... one day... if I keep trying... if I keep asking... I'll be a big boy too... maybe... probably not... but maybe... ok... not... but I don't care :) |
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Burglar
Registered: Dec 2004
Posts: 1031 |
@oswald, isnt learning exactly what he's trying to achieve?
experienced coders (such as myself) don't mind giving noob coders some explanations and pointers ;) |
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Oswald
Registered: Apr 2002
Posts: 5017 |
me too, but its frustrating when the asker disappears, and leaves us here wondering what he even wanted :)
knut has the right answers. |
