qmk_firmware

commit fd01feae4b4dc01ff797754748fa822b2a07fbcb
parent b5104c3a93942aa531540d5f46bd58cd5b3cdb46
Author: coliss86 <coliss86@users.noreply.github.com>
Date:   Sun, 19 Jun 2022 00:32:22 +0200

Add a note about using differents MCU family (#17416)


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docs/feature_split_keyboard.md
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2
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1 file changed, 2 insertions(+), 0 deletions(-)
diff --git a/docs/feature_split_keyboard.md b/docs/feature_split_keyboard.md
@@ -10,6 +10,8 @@ For this, we will mostly be talking about the generic implementation used by the
 
 !> ARM split supports most QMK subsystems when using the 'serial' and 'serial_usart' drivers. I2C slave is currently unsupported.
 
+!> Both sides must use the same MCU family, for eg two Pro Micro-compatible controllers or two Blackpills. Currently, mixing AVR and ARM is not possible as ARM vs AVR uses different method for serial communication, and are not compatible. Moreover Blackpill's uses 3.3v logic, and atmega32u4 uses 5v logic.
+
 ## Compatibility Overview
 
 | Transport                    | AVR                | ARM                |