Focus distance override and bracketing on IXUS cameras

[nirschi]

I'm able to test on an ixus850_sd800 but it's the camera of a friend...

There is absolutely no hurry. Complete you port first and then report.

nirschi

[nirschi]

int MfOn(void){
 x=1;
 SetProperyCase(12,&x,sizeof(x));
 ...

IXUS800 has exactly the same function, but crashes.
Source modules "MF.c" and "MFBar.c" have been stripped. Look for these strings.

Note: SetPropertyCase called, so there is no need to create a NHSTUB(MFon,addr).
Simply call shooting_set_prop(12,1) and see what happens...

[mkmenuts]

Is it possible for CHDK on SD700 to have a corrected copy of the function that crashes the camera?

If it works 90% of the time and crashes on a single input instance, it might not be so hard to complete it... (same for other IXUSes)

Just an idea.

mkmenuts

[quietschi]

Simply press "C" (code) key.

ROM:FF996198                 LDR     R3, =0xB7CA0
ROM:FF99619C                 MOV     R12, #1
ROM:FF9961A0                 STR     LR, [SP,#-4]!
ROM:FF9961A4                 MOV     R0, #0xC
ROM:FF9961A8                 ADD     R1, R3, #0x68
ROM:FF9961AC                 MOV     R2, #2
ROM:FF9961B0                 STRH    R12, [R3,#0x68]
ROM:FF9961B4                 BL      SetPropertyCase
ROM:FF9961B8                 BL      sub_FF998D00
ROM:FF9961BC                 MOV     R0, #0
ROM:FF9961C0                 LDR     PC, [SP],#4

short x; // located at 0xB7CA0+0x68
int MfOn(void){
 x=1;
 SetProperyCase(12,&x,sizeof(x));
 sub_FF998D00();
 return 0;
}

Ok, sorry everyday i learn something new.

btw have you read about the propcase for the ixus850_sd800 they are digicII based?

thanks quietschi

[nirschi]

Is it possible for CHDK on SD700 to have a corrected copy of the function that crashes the camera?
If it works 90% of the time and crashes on a single input instance, it might not be so hard to complete it... (same for other IXUSes)

Hi mkmenuts,

I thought about it, but it is an awful lot of work.

To me, it is very low priority. Just for perfection, I would not do the job.
Auto-focusing works very well for far distances, and full telephoto is meant for that.

I'm currently more interested in the macro range, as you surely noticed.
There auto-focusing begins to fight against you...

[nirschi]

btw have you read about the propcase for the ixus850_sd800 they are digicII based?

Confusing!

You forgot the link: http://chdk.setepontos.com/index.php/topic,445.msg3466.html#msg3466

EDIT: done http://tools.assembla.com/chdk/changeset/291

[jbourgui]

My goals is now to pimp IXUS cameras being always-with-you super macro tools.

@nirschi, I applaud your goal!!  MF on our IXUS cameras would rock!  I'm just wondering how all of this played out...  I have an SD500 (IXUS700), and would love to see if some of the manual focus bugs have been worked out...  I have never compiled my own build, but if it will help troubleshoot for the community, just let me know how, and I'll test for you!!

Also, the goal of having a MF "magnified zoomed focus preview window" is great for cams without that feature...  any success with that?

Cheers and my thanks for all of your hard work! 

-joe

[InnerBushman]

Hi.
IXUS 700 at your command waiting for test orders. I can't wait for manual focus (and focus bracketing) to work in my IXUS so keep up the good works guys ;]

Best regards,
Bushman

PS: tested this build: http://crteknologies.free.fr/publish/chdk/ixus700_sd500-101a_sdover.tar.gz
crashes every time, dunno how to work it around.