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A7iv Rev engineer multi interface flash protocol

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Josef_Underwater View Drop Down
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Post Options Post Options   Quote Josef_Underwater Quote  Post ReplyReply Direct Link To This Post Topic: A7iv Rev engineer multi interface flash protocol
    Posted: 23 December 2023 at 12:30
Dear All,
I work on decoding the multi interface flash protocol to diy a converter from Sony A7iv to optic fibre (connecting to underwater strobe).
Already have recorded signals for stand-by and trigger communication between camera and strobe. So, timings and HEX data available.

IŽm looking now for fellows, who can help interpret the gathered data.

Based on that, IŽll design microcontroller firmware to talk to the camera.

Anyone keen on sharing?
Best! Josef
 



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neilt3 View Drop Down
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Post Options Post Options   Quote neilt3 Quote  Post ReplyReply Direct Link To This Post Posted: 23 December 2023 at 13:14
Welcome to the forum .

Presumably you've already seen the information on this website regards pin layout ?

https://www.mhohner.de/sony-minolta/flashcomp_techref.php#multi

Other than that , I can't help .

see my photostream on flickr;
http://www.flickr.com/photos/neilt3/
C & C welcome.
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Josef_Underwater View Drop Down
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Post Options Post Options   Quote Josef_Underwater Quote  Post ReplyReply Direct Link To This Post Posted: 23 December 2023 at 15:39
THX!! Also for the warm welcome!

Yes, I know this one: it has been of great use already for finding the right wires to capture serial clk/data and F1 signals.
Will try to upload logic analyzer screenshots and HEX data

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Micholand View Drop Down
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Post Options Post Options   Quote Micholand Quote  Post ReplyReply Direct Link To This Post Posted: 23 December 2023 at 15:45
Presumably the flash timing diagrams on the Multi-Interface-Shoe are similar to the old info given on mhohner's site or do they differ on the newer a7IV (see links below)?! For which flash modes did you capture timings?



/Michael

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Josef_Underwater View Drop Down
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Post Options Post Options   Quote Josef_Underwater Quote  Post ReplyReply Direct Link To This Post Posted: 24 December 2023 at 11:56
THX Michael!

Ah, I created a misunderstanding: by "timing" I didnŽt mean the real/final flash light timing but the timing on the digital interface (serial clock and data).

Check out screenshot on https://magentacloud.de/s/4iNDY7tR7zfKmBG to see, what I mean.
There is also a sample of 14 byte /8 bit data in stand-by mode, which comes every 46.5ms, alternating with a 24 byte / bit data set

This protocol seems to be different to what Sebi discovered quite a while ago in his phantastic work, shown here: https://www.dyxum.com/dforum/topic8297.html

Best! Josef
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