remove #define SERIAL_PORT_2 3 from Ender-3 Pro CrealityV422 #818
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As this causes an IO conflict
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Description
UART3_TX_PIN is IO pin PB10
The Creality V4.2.2 uses this pin as #define BTN_EN1 PB10
These are in conflict.
Benefits
Conflict removed
Related Issues
Noticed while adding MarlinFirmware/Marlin#24795
also in ender 2 pro #817