程序出现问题，请大神指教！！

weisheng

linking...
.\out\wifi.axf: Error: L6218E: Undefined symbol enter_interrupt (referred from usart.o).
.\out\wifi.axf: Error: L6218E: Undefined symbol exit_interrupt (referred from usart.o).
.\out\wifi.axf: Error: L6218E: Undefined symbol local_irq_restore (referred from usart.o).
.\out\wifi.axf: Error: L6218E: Undefined symbol local_irq_save (referred from usart.o).
.\out\wifi.axf: Error: L6218E: Undefined symbol mem_free (referred from camera.o).
.\out\wifi.axf: Error: L6218E: Undefined symbol mem_malloc (referred from camera.o).
Not enough information to list image symbols.
Finished: 1 information, 0 warning and 6 error messages.
".\out\wifi.axf" - 6 Error(s), 9 Warning(s).
Target not created.
Build Time Elapsed:  00:01:49

flyleaf

提示里的函数没有定义