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hardware/sejfduino: note about rs485 input/output enable

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Piotr Dobrowolski 2022-06-17 21:33:57 +02:00
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hardware/sejfduino/ERRATA.md
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@ -9,5 +9,11 @@ in a pull-up configuration between reset line and ground.
Sensible place for that is between one C2 leg and reset line going next to it
to J6 programming header.
### #3: RS485 transceiver input/output enable is floating by default
This breaks programming serial communication, unless input/output enable pins
are properly set.
This is fixed by applying optiboot patch - `0001-Disable-RS485-transceiver-when-running-the-bootloade.patch`
## v2.1 - "pulled-up" green PCB
Errata #2 fixed.