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menu "Hardware Drivers Config" menu "On-chip Peripheral Drivers" menu "UART Drivers" config BSP_USING_UART1 bool "Enable UART1 PA9/10(T/R)" select RT_USING_SERIAL default n config BSP_USING_UART2 bool "Enable UART2 PA2/3(T/R)" select RT_USING_SERIAL default y endmenu endmenu endmenu