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/* main.c */
extern int main(void);
/* cdcacm.c */
extern ring_t cdcacm_rx_ring;
extern ring_t cdcacm_tx_ring;
extern uint8_t usbd_control_buffer[128];
extern usbd_device *usbd_dev;
extern void cdcacm_tick(void);
extern void usb_init(void);
/* dfu.c */
extern const struct usb_dfu_descriptor dfu_function;
extern const struct usb_interface_descriptor dfu_iface;
extern int dfu_control_request(usbd_device *usbd_dev, struct usb_setup_data *req, uint8_t **buf, uint16_t *len, usbd_control_complete_callback *complete);
/* ring.c */
extern void ring_init(ring_t *r, uint8_t *buf, size_t len);
extern int ring_write_byte(ring_t *r, uint8_t c);
extern int ring_empty(ring_t *r);
extern int ring_read_byte(ring_t *r, uint8_t *c);
extern int ring_write(ring_t *r, uint8_t *buf, size_t len);
/* usart.c */
extern ring_t usart_rx_ring;
extern ring_t usart_tx_ring;
extern void usart1_isr(void);
extern void usart_kick(void);
extern int _write(int file, char *ptr, int len);
extern void usart_init(void);
/* ticker.c */
extern unsigned led;
extern void delay_us(uint32_t d);
extern void sys_tick_handler(void);
extern void ticker_init(void);
/* timex.c */
extern ring_t timex_ring;
extern void timex_tick(void);
extern void timex_init(void);
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