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z80 & ez80 Assembly
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Jerros
Newbie
Joined: 03 Jul 2010
Posts: 8
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 Posted: 04 Jul 2010 03:36:56 am Post subject: |
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I've recently converted my programm for the TI 84+ to an APP, but now all of my sprites and text is messed up, though it worked fine before.
If anyone has a routine that shows small font text on specific coordinates, that'd be great!
You will get the credits ofcourse.
I'm a real newb in assembly, so don't be afraid to overexplain things.
Any help here would be greatly appreciated! |
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tr1p1ea
Elite
Joined: 03 Aug 2003
Posts: 870
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| Posted: 04 Jul 2010 07:26:30 am Post subject: |
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What are you using to display sprites and is this a single or multi-page APP?
The reason why things are not working is most likely because you are using BCALL's which are switching ROM pages around leaving your inputs pointing to unexpected data.
You can either copy data to RAM before displaying and then call _vPutS or work through the string one char at a time using _vPutMap. |
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Jerros
Newbie
Joined: 03 Jul 2010
Posts: 8
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| Posted: 04 Jul 2010 08:39:10 am Post subject: |
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Thanks for your reply.
It's currently a single-page App, though it might get larger in the furure.
How do I copy my data to the RAM?
That sounds like a real solution, can you give me an example script? (if its not to much trouble of course)
Currently I'm using this to display text:
LD HL, $3604
LD (PenCol), HL
LD HL, achtxtAB2
b_call(_VPutS) |
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calcdude84se
Member
Joined: 09 Aug 2009
Posts: 207
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| Posted: 04 Jul 2010 09:04:45 am Post subject: |
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For copying to RAM, just use ldir and copy to a safe RAM area like appBackupScreen, statVars, or something else, like this:
Code:
ld hl,achtxtAB2
ld de,safeRAM
ld bc,textlen ;the length of the text, including the ending 00h
ldir
and later on, when you want to display it:
Code:
ld hl,$3604
ld (penCol),hl
ld hl,safeRAM
b_call(_vPutS)
However, like tr1p1ea suggested, it might be easier to just display one character at a time with _vPutMap, and have a routine you call to display a string.
Code:
;_safeVPutS
loop:
ld a,(hl)
inc hl
or a ;Better than cp 0, this tests for the end of the string
ret z
b_call(_vPutMap)
jr loop
Last edited by Guest on 04 Jul 2010 09:08:18 am; edited 1 time in total |
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Jerros
Newbie
Joined: 03 Jul 2010
Posts: 8
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| Posted: 05 Jul 2010 05:25:40 am Post subject: |
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calcdude84se wrote:
For copying to RAM, just use ldir and copy to a safe RAM area like appBackupScreen, statVars, or something else, like this:
Code: ld hl,achtxtAB2
ld de,safeRAM
ld bc,textlen ;the length of the text, including the ending 00h
ldir
and later on, when you want to display it:
Code: ld hl,$3604
ld (penCol),hl
ld hl,safeRAM
b_call(_vPutS)
Works perfectly, thanyou so very very much!
After some messing around, I've made things work using your advice.
Like I said, I'm not very advanced into asm, so there was some experimenting involved, but thanks to you I can now display the text noramlly again!
thnks! |
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