typedef struct USBReq USBReq;
typedef struct USBPkt USBPkt;
typedef struct USBQueue USBQueue;
typedef struct USBEp USBEp;

struct USBReq {
	uint8_t bmRequestType;
	uint8_t bRequest;
	uint16_t wValue;
	uint16_t wIndex;
	uint16_t wLength;
	
	uint16_t ptr, len;
	uint8_t *data;
};

struct USBPkt {
	uint16_t len;
	uint16_t ptr;
	USBPkt *next;
	uint8_t data[0];
};

struct USBQueue {
	USBEp *ep;
	USBPkt *first, **nextp;
	int qalloc, maxq;
};

struct USBEp {
	uint8_t devep;
	uint8_t targep;
	uint16_t fifosz;
	uint16_t fifoad;
	USBQueue *q;
};

extern USBQueue msgq;
extern USBQueue corrq;