#define RT_USING_SERIAL
#define RT_USING_USART1
#define RT_USING_UART4
#define RT_SERIAL_USING_DMA
//#define RT_USING_POSIX
/* RT-Thread Components */
.\Objects\UART_DEVICE_REGISTER.axf: Error: L6218E: Undefined symbol rt_data_queue_init (referred from serial.o).
.\Objects\UART_DEVICE_REGISTER.axf: Error: L6218E: Undefined symbol rt_data_queue_peak (referred from serial.o).
.\Objects\UART_DEVICE_REGISTER.axf: Error: L6218E: Undefined symbol rt_data_queue_pop (referred from serial.o).
.\Objects\UART_DEVICE_REGISTER.axf: Error: L6218E: Undefined symbol rt_data_queue_push (referred from serial.o).
Not enough information to list image symbols.
Not enough information to list load addresses in the image map.
Finished: 2 information, 0 warning and 4 error messages.
".\Objects\UART_DEVICE_REGISTER.axf" - 4 Error(s), 0 Warning(s).
Target not created.
Build Time Elapsed: 00:00:10