CHDK for PowerShot SD770 IS/DIGITAL IXUS 85 IS: Update: Pg2 RAW in 12bit

steve b

Hello Forum, First post and no doubt one you have seen a million times before from one camera model to the next.

I recieved a PowerShot SD770 IS / DIGITAL IXUS 85 IS for christmas (hopefully so did some clever clogs on these forums). Knowing nothing about CHDK it came as a suprise to me when a link on Reddit.com pointed me to this website and i started getting very excited about MoCap and Time Lapse among other things. since finding the site ive spent 4 hours searching, reading and watching (its 4:17AM and i should really be asleep) i really love what you've done with the software but was really disapointed to find that my camera is not yet supported. At a guess i would say this is a newish camera? and that not many if any developers have got their hands on one yet. so i was wondering how best to tackle getting things rolling on this model.

ive read a few pages on firmware dumps and submitting new models but according to this page SD770IS - CHDK Wiki a firmware dump already exists which i believe is the first step. so i was wondering what the best way is to get the port moving so i can start playing with all the new features?

i am willing to do as much as i can to help using the camera that i have, but my knowlege of programming and things is basic.

typically i was going to get the IXUS 80 which is supported, but the shop ran out of stock so i went for the slightly more expencive 85. i got my girlfriend a pink ixus 80 the week before and loved it so much i decided to get myself one, so i suppose at worst i can borrow hers to do some testing with lol.

thanks for reading!

reyalp

CHDK SD770 IS
Will you make a release for my Ixus 85is (sd770) ?

Basically, the next step is finding some who
1) Owns the camera, or at least has the use of one.
2) Knows C, ARM assembler, general reverse engineering skills, etc.
3) Is willing to devote a bunch of time to the project.

steve b

ok well check on step 1) i own the camera... lol
step 2) this could be tricky due to the fact that i dont know what an ARM Assembler is and C is well above my head.
check on step 3) im willing to spend a whole bunch of time on this.

so i suppose im going to have to find someone to fill in step 2 ive spent a little of this morning running through pages and pages of the forum seeing what is involved in the next steps, compiling and so on, but it is unfortunately out of my reach i think, the only compiling ive ever done i believe was VB in college and i dont even know if that was compiling so thats me out.

however im willing to try out suff on my camera and report back with results i would even video chat over msn etc with someone to run stuff if it helped, altho im sure no one really wants to work like that. and its probably difficult to get people to work on cameras they dont own. still if anyone wants to try...

failing that can you link me to anything that might give me a fightin chance at having a go with C ive coded other languages before but mainly ones that didnt require compiling so its possible i could get my head around it.

cheers

reyalp

failing that can you link me to anything that might give me a fightin chance at having a go with C ive coded other languages before but mainly ones that didnt require compiling so its possible i could get my head around it.

Compiling is the least of your problem. You are asking for the equivalent of several quarters of undergrad CS courses. You can certainly teach yourself this stuff on your own from books or information on the net, but it's up to you to find the resources you need and spend the time on it. If you really want to do this, Googling "learn c" "learn assembly language" etc will get you started, but don't expect to become a competent C programmer by just reading some tutorials. For most people, months of actually writing and debugging progressively more complicated programs is required to actually get it.

It's worth pointing out that if you spent the same amount of time working instead, you'd probably have enough money at the end to buy a nice DSLR, even at minimum wage (assuming you aren't in India or China etc) If you gave up after a week, you could still buy a decent powershot that's already supported.

I'm not specifically trying to discourage you, but you need to have a realistic idea of how far "I used a little bit of VB" is from where you would need to be.

Everybody who has a camera that isn't ported wants to help out, but there really isn't much you can do until a developer does most of the work.

HouseTribeca

Please someone get this thing made. I really need this in my life.

I got coal for christmas and this is all I really want. Someone kick off my new year with a CHDK for the SD770.

I'm even whining like a 7 year old for this thing...javascript:void(0);

fangbaby

I've also got a SD770.

I am a programmer, I know plenty of ARM assembly, C, and I have access to a lab with a scope and logic analyzer.

I don't have a ton of time, but I suspect that the meat of this porting is not that complicated if you have the skill set required.

Can someone with time do what they can to put relevant info here or in the wiki page? I'll see what I can do with the info that you find.

The wiki is here:
SD770IS - CHDK Wiki

sharky

😁 Partial success on the sd770 / ixus 85 IS

I'm using the base from the ixus80 sd1100 and after some hacking it now boots and shows the splash screen

keys are still broken, so I will post a binary image when that works (tomorrow ?)

cheers,
Sharky

sharky

here is the work-in-progress DISKBOOT.BIN for the ixus 85 IS / SD770 with firmware 100a

things that work:

- menu, histogram, debug stuff, various overrides

things that don't work:

- RAW stuff is not done yet, movie override not done yet

continuous bracketing crashes presumably due to broken RAW support

also, this image flashes the orange LED before and after loading the image. that's just a debug feature for now.

DISKBOOT.BIN

250.32KB

kayec

AWESOME !!!!!

BobWils13

The last time I checked this Wiki there was nothing happening on the SD770 IS...this conversation just made my day, most likely my week, and probably my month. Awesome, keep it up.

ROGUE

Wow, I'm glad there has been progress on building CHDK for the SD770/Ixus 85 IS. I know it's only a work in progress, so doesn't have all the features working yet, but it's great news to see that someone is working on it.

I hope that it won't be too long before all the bugs are worked out and we have a working full version of CHDK for this camera!

I look forward to trying the work in progress version soon 😀

fangbaby

Glad there is so much interest and that I won't have to do it 😀

Can't wait to load it up!

johnmcdonald98

did any one try?

steve b

ill give this a go in a mo let me know if you need any help testing etc as this is moving ill keep my eye on this thread!! woo

steve b

yep works tried in my cam boots meu can load svripts, not sure if its me being usless or just part of the process some of the scripts crashed they were for the 80 camera tho

but menu comes up, battery meter etc 😀 definately on its way!!

sharky

yeah there are a few crashes in there still

I have fixed most of them now I think, but the RAW data its saving seems to be wrong at the moment.

I'll get you an update soon

kayec

My brother borrowed my camera but i'll have it back next week and can't wait to try the install.

As for the RAW saving... maybe it's 12bit like the 790???? *wish* *hope* *dream*....

sharky

interesting you say that ..

some numbers I found in the ROM only add up if the CCD is 12 bit ..

on the other hand I have had no luck yet getting the raw data dumped yet, so this may be completely bogus 😀

trghpy

Hey gang I just got an SD770, and I'm currently "Attempting to fetch gcc-core-4.3.2.tar.bz2". 🤣 Zzz (for the last 12 hours)

Whats the status? How can I help?

-Mike

sharky

Status is that the DISKBOOT.BIN for download at the beginning of this thread kind-of-works.

Most important is that the RAW writing doesn't work at the moment. I have just found the RAW data in the cam's memory. Strangely enough though, the data is now 'windowed' which means we have to recode the raw dumping code a little to get the entire image (I'm getting only the first 1/3rd part at the moment).

However, I CAN report that we're getting 12 bits-per-pixel, which is a first for the Canon's supported by CHDK. Since I'm not getting the full image yet I'm note 100% sure about all this yet, but it looks like the data really is 12bit.