endpoint_0.h

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#ifndef USB_ENDPOINT_0_H
#define USB_ENDPOINT_0_H

#include <stdint.h>
#include "usb/std.h"

enum control_stage_t {
    CTRL_IDLE 
  , CTRL_SETUP 
  , CTRL_STALL 
  , CTRL_DATA_IN 
  , CTRL_DATA_OUT 
  , CTRL_HANDSHAKE_IN 
  , CTRL_HANDSHAKE_OUT 
  , CTRL_POST_HANDSHAKE 
};

enum vendor_request_t {
  VENDOR_REQUEST_PUSH_FRAME = 1,
  VENDOR_REQUEST_DISPLAY_PROPERTIES = 2,
  VENDOR_REQUEST_EEPROM_WRITE = 3,
  VENDOR_REQUEST_EEPROM_READ = 4,
  VENDOR_REQUEST_FRAME_DRAW_STATUS = 5,
  VENDOR_REQUEST_FRAME_DRAW_SYNC = 6
};

struct control_transfer_t {
  enum control_stage_t stage;
  const struct usb_setup_packet_t* req;
  void* data;
  uint16_t data_length;
  uint16_t data_done;
  void (*callback_data)(struct control_transfer_t* transfer);
  void (*callback_handshake)(struct control_transfer_t* transfer);
  void (*callback_cancel)(struct control_transfer_t* transfer);
};

void process_setup(struct control_transfer_t* transfer);

void init_control_transfer(
      struct control_transfer_t* transfer
    , const struct usb_setup_packet_t* setup
);

void cancel_control_transfer(struct control_transfer_t* transfer);

void control_mark_data_done(struct control_transfer_t* transfer, uint16_t length);

#endif //USB_ENDPOINT_0_H