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Canon switched the OS from VxWorks (used on earlier cams) to their own DRYOS with the A720. That means that a lot of reverse engineering was done to find out how to hook an extension like CHDK into the A720. |
Canon switched the OS from VxWorks (used on earlier cams) to their own DRYOS with the A720. That means that a lot of reverse engineering was done to find out how to hook an extension like CHDK into the A720. |
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See [http://forums.dpreview.com/forums/read.asp?forum=1010&message=25508181 dpreview-posting] and [http://www.canon.com/technology/canon_tech/explanation/dryos.html Canon page on DRYOS] |
See [http://forums.dpreview.com/forums/read.asp?forum=1010&message=25508181 dpreview-posting] and [http://www.canon.com/technology/canon_tech/explanation/dryos.html Canon page on DRYOS] |
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| − | : Most of the porting work is nearly done now! |
+ | : Most of the porting work is nearly done now! |
A (nearly) complete port of Allbest's branch is finished. Only few features are missing, such as |
A (nearly) complete port of Allbest's branch is finished. Only few features are missing, such as |
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Revision as of 15:34, 26 April 2008
Camera technical data
| Release date: | August 2007 |
| Sensor CCD size: | 8.0 MP 1/2.5" |
| Lens (35mm equiv) zoom | 35-210, 6x |
| LCD size | 2.5" fixed |
| Card | SD / SDHC / MMC |
| Size (mm) | 96.5 x 66.0 x 43.2 |
| Weight (body) | 200 g |
Specification from Digital Photography Review: Canon A720 IS
Inside this decent camera, the OS is the new DryOS, see also DryOS Porting.
Firmware info
Firmware information is given if ver.req exists on the SD.
In PLAY mode (with ver.req) press FUNCSET and DISP simultaneously:
Canon PowerShot A720 IS P-ID:315D PAL D Firmware Ver GM1.00C E18 Jul 5 2007 11:32:58
Subsequent press of DISP (while still holding FUNCSET) reveals:
Adj Ver.012.006 ZoomLensError 2007.10.22 00:41:26
After another subsequent press of DISP (while still holding FUNCSET) reveals:
Adj Ver.012.006 IS Firm Ver. 3.00 IS Param Ver. 3.11
Firmware Dump
Firmware extraction using the blinker was some trouble but worked.
Here is the file: A720IS-100c.zip
Since DryOS firmware update procedure requires faultless PS.fi2 file, "Firm Update..." menu entry can't be used to run blinker.
Fortunately it is still possible to run blinker from "diskboot.bin" file on bootable and write protected memory card.
LED memory adresses
#define AF 0xC02200c0 // AF-Beam (red) #define DP 0xC02200c4 // direct-print (blue) #define OR 0xC02200c8 // orange state-led (bi-state with green) #define GR 0xC02200cc // green state-led (bi-state with orange) #define YE 0xC02200d0 // Yellow state-led #define PW 0xC02200d4 // Power (green)
Current Status
Canon switched the OS from VxWorks (used on earlier cams) to their own DRYOS with the A720. That means that a lot of reverse engineering was done to find out how to hook an extension like CHDK into the A720. See dpreview-posting and Canon page on DRYOS
- Most of the porting work is nearly done now!
A (nearly) complete port of Allbest's branch is finished. Only few features are missing, such as
usb-support for remote shooting- works now.- long filename support in filemanager
You need to:
- download Allbest's branch for the A720 from http://malbe.nm.ru/chdk/
- Enable bootdisk-support, see Bootable SD card and/or http://chdk.setepontos.com/index.php/topic,234.msg2508.html#msg2508
The dcraw beginning with version 8.82 supports RAW format for A720 IS.