config RT_USING_UART1
    bool "Enable UART1 (PA9/10)"
    default y

config RT_USING_UART2
    bool "Enable UART2 (PA2/3)"
    default y

config RT_USING_UART3
    bool "Enable UART3 (PB10/11)"
    default y

config RT_USING_UART4
    bool "Enable UART4 (PC10/11)"
    default n