-extern void ReaderTransmit(uint8_t *frame, int len, uint32_t *timing);
-extern void ReaderTransmitBitsPar(uint8_t *frame, int bits, uint32_t par, uint32_t *timing);
-extern void ReaderTransmitPar(uint8_t *frame, int len, uint32_t par, uint32_t *timing);
-extern int ReaderReceive(uint8_t *receivedAnswer);
-extern int ReaderReceivePar(uint8_t *receivedAnswer, uint32_t *parptr);
+extern void ReaderTransmit(uint8_t *frame, uint16_t len, uint32_t *timing);
+extern void ReaderTransmitBitsPar(uint8_t *frame, uint16_t bits, uint8_t *par, uint32_t *timing);
+extern void ReaderTransmitPar(uint8_t *frame, uint16_t len, uint8_t *par, uint32_t *timing);
+extern int ReaderReceive(uint8_t *receivedAnswer, uint8_t *par);