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If you are familiar with the TX19A architecture (TMP19A43CDXBG on 600D), this bug might be patchable directly in camera software, without any wires. We've got a memory dumper for the CPU that handles lens communication (Canon calls it MPU), but never tried to reprogram it.
I thought of patching it on the camera, but it would be good to just have the lens work on any other camera too. And there's plenty of space inside for an attiny, and I needed to take it apart for cleaning anyway :-)
Very cool hack, looking forward to any juicy details you might have. Just FYI, one of these pins might show some diagnostic messages from the MPU over UART: https://www.magiclantern.fm/forum/index.php?topic=7531.msg188817#msg188817 …
Ah, didn't know there were UARTs on there. I pick up some pogo pins and 3D print a jig to see if there's anything interesting. The main issue with the lens proto is there is no framing. Plan is to take a Canon lens and try all 00-ff commands to find out the argument count.
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