不懂这是什么意思呀，步骤跟正点原子里面的操作完全一样，为啥我编译就有warning
..HALLIBSrcstm32f4xx_ll_usb.c(786): warning:  #3108-D: attribute "__packed__" does not apply here
        USBx_DFIFO(ch_ep_num) = *((__packed uint32_t *)src);
..HALLIBSrcstm32f4xx_ll_usb.c(812): warning:  #3108-D: attribute "__packed__" does not apply here
      *(__packed uint32_t *)dest = USBx_DFIFO(0);
..HALLIBSrcstm32f4xx_ll_usb.c: 2 warnings, 0 errors
是因为我的是盗版么？