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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 Sensible place for that is between one C2 leg and reset line going next to it
to J6 programming header. 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 ## v2.1 - "pulled-up" green PCB
Errata #2 fixed. Errata #2 fixed.