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ACagliano
Super-Expert
Joined: 08 Feb 2010
Posts: 922
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 Posted: 16 Jan 2012 12:02:05 am Post subject: Swapping Flash Pages |
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I'm just curious, since I've gotten a bit into app writing, how you would swap a flash page, call a routine on another page, then return to the page you were on.
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Xeda112358
Power User
Joined: 09 Nov 2010
Posts: 345
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| Posted: 16 Jan 2012 01:02:32 am Post subject: |
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I typically copy some code to RAM to do that task. For example, if you are not using the region. You can copy the code like this:
Code:
CallIXNextPage:
ld de,8000h
push de
ld hl,CallData
ld bc,CallDataEnd-CallData
ldir
ld (8006h),ix
ret
CallData:
in a,(6)
inc a
out (6),a
call yerackshulcall
in a,(6)
dec a
out (6),a
ret
CallDataEnd:
You store the location of the call in ix and then you call CallIXNextPage. That will just call something on the next page. That code can be better tailored to what you need, but I am not sure of the circumstances :/ |
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KermMartian
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Joined: 14 Mar 2005
Posts: 55733
Location: Earth, Sol, Milky Way
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| Posted: 16 Jan 2012 09:25:30 am Post subject: |
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I do almost the exact same thing, except that I throw the new page to be loaded into th eaccumulator before CallData since I generally want to reuse the routine for plenty of different page swaps.
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ACagliano
Super-Expert
Joined: 08 Feb 2010
Posts: 922
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| Posted: 16 Jan 2012 10:02:48 am Post subject: |
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Well, I was actually interested in, say, calling the DCS GUI functions from within another app.
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Xeda112358
Power User
Joined: 09 Nov 2010
Posts: 345
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| Posted: 16 Jan 2012 12:47:05 pm Post subject: |
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Another thing you can do is keep a spot of memory that contains the page your app is on and then you don't need to save your app page again, you can just load from that spot in memory before restoring the flash page  |
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KermMartian
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Joined: 14 Mar 2005
Posts: 55733
Location: Earth, Sol, Milky Way
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| Posted: 16 Jan 2012 01:24:56 pm Post subject: |
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| Xeda112358 wrote: | | Another thing you can do is keep a spot of memory that contains the page your app is on and then you don't need to save your app page again, you can just load from that spot in memory before restoring the flash page |
The only difficulty there is making sure the code on whatever you call into won't directly or indirectly wipe out (a) the part of memory where your routine stub is and/or (b) the part of memory where the return page is stored.
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ACagliano
Super-Expert
Joined: 08 Feb 2010
Posts: 922
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| Posted: 08 Feb 2012 07:02:03 pm Post subject: |
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.in App programming, can I use the .branch directive to add a DCS GUI function to the branch table? Or any other app routine, for that matter?
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KermMartian
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Joined: 14 Mar 2005
Posts: 55733
Location: Earth, Sol, Milky Way
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| Posted: 08 Feb 2012 07:45:01 pm Post subject: |
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No, because it's in another App. .branch is only for routines in your own app, on any of its pages.
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ACagliano
Super-Expert
Joined: 08 Feb 2010
Posts: 922
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| Posted: 09 Feb 2012 09:14:51 am Post subject: |
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Is there any way, at all, to use a routine from another app?
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benryves
Cemetech Expert
Joined: 12 Aug 2008
Posts: 1357
Location: London, United Kingdom
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| Posted: 09 Feb 2012 09:29:35 am Post subject: |
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| Yes. You will first need to swap the relevant application's page in manually; to do this, use the FindApp routine to search for the application and which page it's on. To swap the page in output the page number to port memPageAPort. Naturally, doing so will swap out the page you were previously on, so you'll likely need to copy a small stub of code to RAM so you have a safe location to invoke the function from. |
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ACagliano
Super-Expert
Joined: 08 Feb 2010
Posts: 922
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| Posted: 09 Feb 2012 09:40:17 am Post subject: |
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Code:
ld hl, $ ;is there a symbol for the current executing address?
push hl
ld hl, code to copy
ld de, saferam1
ld bc, size of code
ldir
jr z, saferam1
@saferam1
//code I copied
pop hl
jr hl ?? Can I do that?
Is that good?
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benryves
Cemetech Expert
Joined: 12 Aug 2008
Posts: 1357
Location: London, United Kingdom
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| Posted: 09 Feb 2012 09:43:29 am Post subject: |
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Don't bother with all that manual pushing and popping - just call saferam1 and ret when you're done.
You might also find the .relocate directive useful. |
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