CHDK is available as beta version for the Powershot A430 with firmware version 1.00b from the forum.
The trick with the ver.req file works on the A430 as well, with the following result:
Canon PowerShot A430 P-ID:30F8 PAL Firmware Ver GM1.00B E18 Dec 6 2005 09:17:55
Pressing+ buttons again results in:
Canon PowerShot A430 P-ID:30F8 PAL Adj Ver.005.001 ZoomLensError 2007.08.31 18:54:46
Further+ pressing does not change anything if the file was ver.req. However, if the file is called vers.req, a third screen is shown:
Canon PowerShot A430 P-ID:30F8 PAL Adj Ver.005.001 Total Shoot :6707 Open Shutter :0 Close Shutter:0
Normally it should show "No Error". It looks like my camera got a ZoomLensError on August 31, 2007. On that date the lens was hit hard, but the camera is still okay.
The number P-ID:XXXX is a hexadecimal code for the platform version id.
Platform codes for other models can be looked up under P-ID.
Following the example of the A530 page, everything that might be useful for a port of CHDK to A430 should be posted here.
Following information is probably generic to other models (A5xx, A6xx, A7xx series)
0xff800000: firmware flash data (probably)
0xffc00000: mirror copy of firmware flash? (to be determined)
0xc0220080: 0x46 enables orange focus assist LED, 0x44 disables it
0xc0220084: 0x46 enables blue print LED, 0x44 disables it
The blinker method was used to dump the firmware.
A blinker firmware was compiled using yagarto. In the XXXX.c file, the firmware ID must be replaced by the one given obtained via ver.req (XXX). If cygwin is installed on your computer, in make.bat, replace
zero | dd bs=1k count=100 >> main
by the following two lines:
c:\cygwin\bin\dd.exe bs=1k count=100 if=/dev/zero of=main.zero c:\cygwin\bin\cat.exe main.zero >> main
Phototransistor active circuit
The PC's microphone input has a 2.34V rail available on one of the channels, so I tried a few powered circuit (both photodiode and phototransistor). They give a much larger signal, but the shape of the signal still differs from the ones given as example.
The test circuit uses a small piece of breadboard. Bottom side has two rows of 3 tulip sockets. This is where I plug-in my phototransistors and filter cap. Top side has three rows of 3 tulip sockets. The one away from the cable, I plug my 1k trim in. The other two are used for bridging the circuit with the computer. These can be removed and replaced by filtering caps if needed.
The trimmer (blue on the photo above) has one of its legs bent so that it doesn't make contact. The two legs making contact with the circuit are the one under the screw and the middle one. The red component is a 1μF ceramic cap used to filter the output (see screenshots below).
Firmware recording using audacity
I am now trying for the blue LED with slower transfer speed. I used my amplified circuit and tried both the S1226-8BQ photodiode, YY66W (IR) and SFH300-3 phototransistors. Surprisingly enough, the IR phototransistor is the one that gives the largest signal (see screenshots). With a lower transfer speed, I now get the waveform I was expecting.
The effect of the 1μF cap is shown in screenshot 2 (screenshot 1 is without). The signal amplitude is more constant and will (probably) result in fewer decoding errors.
All in all, it now looks like I should be able to get a firmware dump.
It seems that the fastest speed (AF assist LED) is not an option for dumping the firmware. At that speed, the waveform is distorted and may not be decoded (see screenshot). Instead, the blue LED at the back of the camera was used to output the firmware, and an active circuit based around the YY66W phototransistor was used to read the firmware out.
- Firmware dump A430 FW 1.00B: dl site (Forum link: http://chdk.setepontos.com/index.php/topic,288.msg33967.html#msg33967)
Download location for firmware dumps:
- 22-Aug-2010: A430 1.00B beta port is in the CHDK trunk now.
- → The latest CHDK beta version for the A430 1.00B is available from here: forum link
- 21-Jun-2009: Porting the A430 with fw 1.00b has started: Forum link (by shentey)