SX100 IS - page 28 - Firmware Dumping - CHDK Forum
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SX100 IS

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Offline yogaman

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Re: SX100 IS
« Reply #270 on: 15 / July / 2009, 20:27:47 »
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Focus Bracketing fails due to Set_Focus not working.


My SX100IS with 1.00B DryOS, running CHDK 0.9.8-770 released on Jun 4, 2009, cannot set_focus correctly.
I've tried various values for the set_focus parameter, but the call to set_focus X seems to cause the next get_focus to return either 74, apparently if 3000 < X < 20000, or else 65535, but range boundaries are not nailed down yet.

Before call to set_focus, the value from get_focus can be seen to vary by exiting the script and changing the focus manually or via AF. (Not confirmed that returned value reflects actual focus setting; I've seen 4454, 655, 621 and a few others

Can I buy a clue, please? Or does focus bracketing work fine for everyone else?

If there's a better place to post this request, please advise.

Update:
get_focus seems to be returning a number related to the Telephoto position.

« Last Edit: 15 / July / 2009, 21:58:28 by yogaman »
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Offline yogaman

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Re: SX100 IS
« Reply #271 on: 15 / July / 2009, 22:00:57 »
Interesting anomalous behavior:

This seems likely to be related to my just previous difficulty with set_focus.

In Manual mode, Manual Focus with Telephoto in a middle position, focus approx 5-10 feet,
1. Enter ALT mode.
2. Move Telephoto lever toward minimum (0.3 inches).
3. Exit ALT mode.
4. Re-engage Manual Focus by pressing <- button, then FUNC SET button. (It seems to lose track that it was in MF; the display icon seems correct, but the focus wheel either adjusts exposure or does nothing. Perhaps this is the correct state; I haven't seen the state machine.)
5. Notice that Focus position is near minimum.

Similarly moving Telephoto lever to the right during ALT mode causes Focus to be set at/near Infinity upon exit from ALT mode.

I haven't looked at the code (or downloaded tools, etc), but I wonder if some kind programmer has possibly confused the Telephoto functions with the Focus functions.

Is the focus wheel on the SX100 different from other Canon cameras?

Again, if there's a better place to report such, please advise.
« Last Edit: 15 / July / 2009, 22:04:17 by yogaman »
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Offline yogaman

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Re: SX100 IS
« Reply #272 on: 15 / July / 2009, 22:38:44 »
OK, I peeked at the source code. In trunk\platform\sx100is\100b\, stubs_entry_2.S, line 69 says:

NHSTUB(MoveFocusLensToDistance, 0xFFDC0C60)   // In SX100 MoveIrisToAvWithoutBacklash_2

Unlike many of the lines in that file, the first two characters are not //.

My guess is that this comment is somehow closely related to my previous posts.

I hope this information helps someone who is knowledgeable resolve this issue.
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Offline yogaman

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Re: SX100 IS
« Reply #273 on: 26 / July / 2009, 15:08:23 »
I've confirmed that the set_focus and get_focus functions do not work on the sx100is 1.00b as described in the uBASIC documentation.


For set_focus x, x<1326, get_focus returns 65,535
For set_focus x, x>1726, get_focus returns 74
For set_focus x, 1327<x<1726, get_focus returns a value between 4008 and 75, with bigger set_focus values returning smaller get_focus values, with very gradual increments near 1725 and very rapid increments near 1327.

It appears that 74 represents the closest focus position.
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Offline VMark

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Re: SX100 IS
« Reply #274 on: 06 / August / 2009, 08:17:14 »
Hello ALL,
I have also SX 100 IS 1.00b, with the same problem - small green arrows are in the wrong place. This problem exists from the very beginning (when I started CHDK), I tested with 0.9.6-710 and 0.9.8-788 also, same results.

My results:
- The camera shows the green arrows WHERE THE PREVIOUS mode wanted to.
Examples:
- I switch on cam in Av mode, I cannot change F value, nor eV.
(CONCLUSION: Cannot change anything, because previous was "off" mode)
- Now I change to Tv mode. Now I can change eV and an empty value between shutter speed and eV (position of F but no number and and does not change anything if I turn lower or higher) BUT I cannot change the shutter speed.
(CONCLUSION: Can change eV and position of F because previous mode was Av).
- If I change to P mode, I can change eV and an empty value in the position of shutter speed.
(CONCLUSION: Can change eV and position of shutter speed because the previous mode was Tv.

The same situation with all modes.

My workaround was:
Change mode and immediately back to my desired mode.
(CONCLUSION: Can change values which is approptiate for the desired mode, because the previous mode was the same...)

BUT the below quoted workaround is better (tried and worked - until next switch on - naturally).


Probably this logic could help who has programming ability and willing to change this issue...

Quote from: jiminez on 18 / September / 2008, 16:23:11
SX100IS 1.00b workaround.    In summary it seems that some with SX100 firmware 1.00b are having issues and some are not.        I am in the category of those who are experiencing some problems, however, I am able to get everything working with a little workaround.


This is the startup process I have to use:  (When I press the on/off button it takes me to view picture mode instead of take a photograph mode)  I then press the shutter release which takes me to take a picture mode.  Next I have to make sure to switch the rotary selector on top to M full manual mode.  Then I press the view photo button twice, the first time takes me to view the last picture, and the second time returns me to take a photo in full manual mode.  Now the rotary selector on the back functions as it should.

...

« Last Edit: 01 / October / 2009, 16:45:50 by VMark »
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Offline zerox

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Re: SX100 IS
« Reply #275 on: 06 / November / 2009, 17:56:54 »
Is there any SX100IS developers who can create "extra long exposure"  function ( http://chdk.setepontos.com/index.php?topic=3461.0 ) for this camera?

Thanks :)
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Offline srsa_4c

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Re: SX100 IS
« Reply #276 on: 24 / August / 2011, 16:36:31 »
Extra long exposure support for the 1.00c revision.

If somebody with a greater knowledge of DryOS could review the way exp_drv_task is started, that would be great. I simply copied the method from the ixus80 port (which runs the same DryOS revision), but used only one taskCreateHook() function, twice*. Before this change, there was no taskCreateHook() here, all other tasks are started by modified original code, I think.

/platform/sx100is/sub/100c/boot.c excerpt
Code: [Select]
void taskCreateHook(int *p) { //function taken from the ixus80 port, adapted of course
 p-=16;
 if (p[0]==0xffc98f18)  p[0]=(int)exp_drv_task;
}

//#define DEBUG_LED 0xC02200C4
void boot() { //#fs
    long *canon_data_src = (void*)0xFFEBE450;
    long *canon_data_dst = (void*)0x1900;
    long canon_data_len = 0xf6c4 - 0x1900; // data_end - data_start
    long *canon_bss_start = (void*)0xf6c4; // just after data
    long canon_bss_len = 0x9F498 - 0xf6c4;

    long i;

// Code taken from VxWorks CHDK. Changes CPU speed?
    asm volatile (
"MRC     p15, 0, R0,c1,c0\n"
"ORR     R0, R0, #0x1000\n"
"ORR     R0, R0, #4\n"
"ORR     R0, R0, #1\n"
"MCR     p15, 0, R0,c1,c0\n"
    :::"r0");

    for(i=0;i<canon_data_len/4;i++)
canon_data_dst[i]=canon_data_src[i];

    for(i=0;i<canon_bss_len/4;i++)
canon_bss_start[i]=0;

    *(int*)0x1930=(int)taskCreateHook; //from ixus80 port
    *(int*)0x1934=(int)taskCreateHook; //from ixus80 port (was taskCreateHook2...)
The camera seems to work ok, extra long expos are available.

Attached is a source patch for chdk trunk rev. 1304.

Edit

Just noticed, this is in the "Firmware dumping" section. I decided to post here, because this was/is this model's porting thread.

Edit 2:

I have found at least the sx220 port doing the same (*) with its taskHook() function, so my version should be ok too.
« Last Edit: 25 / August / 2011, 11:06:56 by srsa_4c »
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