std.h

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#ifndef USB_STD_H
#define USB_STD_H

#include <stdint.h>

enum usb_pid_t {
    PID_OUT = 0x1
  , PID_IN = 0x9
  , PID_SOF = 0x5
  , PID_SETUP = 0xD
  , PID_DATA0 = 0x3
  , PID_DATA1 = 0xB
  , PID_DATA2 = 0x7
  , PID_MDATA = 0xF
  , PID_ACK = 0x2
  , PID_NAK = 0xA
  , PID_STALL = 0xE
  , PIT_NYET = 0x6
  , PID_PRE = 0xC
  , PID_ERR = 0xC
  , PID_SPLIT = 0x8
  , PID_PING = 0x4
};

enum usb_request_code_t {
    GET_STATUS = 0 
  , CLEAR_FEATURE = 1 
  , SET_FEATURE = 3 
  , SET_ADDRESS = 5 
  , GET_DESCRIPTOR = 6 
  , SET_DESCRIPTOR = 7 
  , GET_CONFIGURATION = 8 
  , SET_CONFIGURATION = 9 
  , GET_INTERFACE = 10 
  , SET_INTERFACE = 11 
  , SYNCH_FRAME = 12 
};

#define REQ_DIR_MASK (0x1<<7)
#define REQ_DIR_OUT (0<<7)
#define REQ_DIR_IN (1<<7)
#define GET_REQUEST_DIRECTION(bmRequestType) (bmRequestType & REQ_DIR_MASK)

#define REQ_TYPE_MASK (0x3<<5)
#define REQ_TYPE_STANDARD (0<<5)
#define REQ_TYPE_CLASS (1<<5)
#define REQ_TYPE_VENDOR (2<<5)
#define GET_REQUEST_TYPE(bmRequestType) (bmRequestType & REQ_TYPE_MASK)

#define REQ_REC_MASK 0x1F
#define REQ_REC_DEVICE 0
#define REQ_REC_INTERFACE 1
#define REQ_REC_ENDPOINT 2
#define REQ_REC_OTHER 3
#define GET_REQUEST_RECIPIENT(bmRequestType) (bmRequestType & REQ_REC_MASK)

#define DEVICE_STATUS_SELF_POWERED 1
#define DEVICE_STATUS_REMOTE_WAKEUP 2
#define ENDPOINT_STATUS_HALTED 1

enum usb_feature_t {
  ENDPOINT_HALT = 0,
  REMOTE_WAKEUP = 1,
  TEST_MODE = 2
};


struct usb_setup_packet_t {
  uint8_t bmRequestType;
  uint8_t bRequest; 
  uint16_t wValue; 
  uint16_t wIndex; 
  uint16_t wLength; 
} __attribute__((packed));

#endif // USB_STD_H