Post #3499685
2026-06-25 06:57 UTC
It appears that the DIR pin is operating backwards. When asserted, that should step in, towards track zero, and outwards when deasserted. So the T1200 is at track 0 and wants to step to track 1, but it's instead trying to go the other direction and staying at track 0. Repeat ad infinitum. I think I can pretty easily invert the GPIO signals.
Replies (1)
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@bytex64@awesome.garden 2026-06-25 07:26
Manual testing shows it working now (thanks to the RP2040 designers for putting selectable inverters on both inputs and outputs before the mux), but now the laptop doesn’t want to start so I guess I’ll be testing it tomorrow.