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#ifndef RFID_H
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#define RFID_H
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/* First byte back from rfid reader */
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#define RFID_OK 1
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/* Bytes in serial number on rfid tags */
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#define RFID_SERNO_SIZE 4
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/* In rfid_read_safe, it must read the same value RFID_MIN_OK times. If it
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 * encounters RFID_MAX_ERRS read errors first, it will output all 0's. */
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#define RFID_MAX_ERRS 10
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#define RFID_MIN_OK 5
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/* Should be called before anything else */
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void rfid_init();
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/* Reads the serial number of an rfid tag into an internal buffer, accessible
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 * with rfid_get_serno */
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void rfid_read();
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/* Attempts to read the serial number multiple times, and only accepts it if it
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 * is the same every time. Use rfid_read instead until this one is proven
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 * necessary */
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void rfid_read_safe();
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/* Call this only after calling rfid_read. This will copy the value it read
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 * into serno, which should be at least RFID_SERNO_SIZE bytes */
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void rfid_get_serno(char *serno);
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/* Call this only after calling rfid_read. Returns 1 if serno matches the
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 * internal buffer of the most recently read serial number */
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char rfid_check_serno(char *serno);
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/* Call this only after calling rfid_read. Returns 1 if the internal buffer is
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 * nonzero, meaning a serial number was successfully read from an rfid tag */
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char rfid_nonzero();
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#endif