Tooltron

#ifndef RFID_H

#define RFID_H

/* First byte back from rfid reader */

#define RFID_OK 1

/* Bytes in serial number on rfid tags */

#define RFID_SERNO_SIZE 4

/* In rfid_read_safe, it must read the same value RFID_MIN_OK times. If it

 * encounters RFID_MAX_ERRS read errors first, it will output all 0's. */

#define RFID_MAX_ERRS 10

#define RFID_MIN_OK 5

/* Should be called before anything else */

void rfid_init();

/* Reads the serial number of an rfid tag into an internal buffer, accessible

 * with rfid_get_serno */

void rfid_read();

/* Attempts to read the serial number multiple times, and only accepts it if it

 * is the same every time. Use rfid_read instead until this one is proven

 * necessary */

void rfid_read_safe();

/* Call this only after calling rfid_read. This will copy the value it read

 * into serno, which should be at least RFID_SERNO_SIZE bytes */

void rfid_get_serno(char *serno);

/* Call this only after calling rfid_read. Returns 1 if serno matches the

 * internal buffer of the most recently read serial number */

char rfid_check_serno(char *serno);

/* Call this only after calling rfid_read. Returns 1 if the internal buffer is

 * nonzero, meaning a serial number was successfully read from an rfid tag */

char rfid_nonzero();

#endif