需要添加头文件吗?
main.c:34: error: `VM_UART_RATE_9K6' undeclared (first use in this function)
main.c:34: error: (Each undeclared identifier is reported only once
main.c:34: error: for each function it appears in.)
main.c:34: error: `VM_UART_STOP_TWO' undeclared (first use in this function)
main.c:34: error: `VM_UART_PARITY_NONE' undeclared (first use in this function)