amstan
Joined 4 years ago
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Joined 4 years ago
[1] https://en.wikipedia.org/wiki/Advanced_eXtensible_Interface
Op probably missed https://github.com/FrameworkComputer/FrameworkDebugger#jspi. Though, the connector is not populated for cost reasons.
Otherwise, I agree with the author, this is a pain.
[1] https://github.com/tinygrad/asm2464pd-firmware/blob/master/U...
The safest thing is to have a 4th vref/vccio pin, then the debugger should power its tx signal from that pin, at whatever voltage it's at. Same for the RX pin, it's not nice to have a pullup to a certain voltage when the target is off.
https://people.kernel.org/bleung/how-to-design-a-proper-usb-...