#define BUFSIZE 64

struct cdc;

struct cdc *cdc_open (uint8_t num);
void cdc_wait_configured (struct cdc *);
void cdc_wait_connection (struct cdc *);
int cdc_send (struct cdc *s, const char *buf, int count);
int cdc_recv (struct cdc *s, char *buf, uint32_t *timeout);