#define RCDO       (-3)       /* Error Code for Remote Carrier Drop Out */
#define CTSTIMEOUT (-4)       /* Error Code for Clear To Send Timeout in sendline() */

int    UsbActive(void);
int    printfUSB(char * str, ...);

size_t fast_fread(void *_ptr, size_t _size, size_t _nmemb, FILE *_stream);

int    ModemIRQActive(void);
int    ModemCDActive(void);
int    ModemCTSActive(void);