USB-I2C/firmware/usb.h

/* Minimal polled USB CDC-ACM device stack for ATmega8U2 (no LUFA, no interrupts) */
#ifndef USB_H
#define USB_H

#include <stdint.h>
#include <stdbool.h>

#define USB_PACKET 64

void    usb_init(void);
void    usb_task(void);              /* call often: reset + EP0 handling   */
bool    usb_ready(void);             /* true once host configured device   */
uint8_t usb_rx(uint8_t *buf);        /* copy one OUT packet (<=64B), 0=none */
void    usb_tx(const uint8_t *buf, uint8_t n);  /* send one IN packet (<=64B), drops on timeout */

#endif