diskio.c代码
#include <stdint.h> #include <stdbool.h> #include "inc/hw_types.h" #include "driverlib/sysctl.h" #include "usblib/usblib.h" #include "usblib/usbmsc.h" #include "usblib/host/usbhost.h" #include "usblib/host/usbhmsc.h" #include "diskio.h" #include "ff.h"
extern tUSBHMSCInstance *psMSCInstance;
错误提示：tUSBHMSCInstance *psMSCInstance未被定义，psMSCInstance这个应该是用来读取USB状态的，请问main中哪个函数用来读取状态啊？