+// Delays in SSP_CLK ticks.
+// SSP_CLK runs at 13,56MHz / 32 = 423.75kHz when simulating a tag
+#define DELAY_ISO15693_VCD_TO_VICC_SIM 132 // 132/423.75kHz = 311.5us from end of command EOF to start of tag response
+//SSP_CLK runs at 13.56MHz / 4 = 3,39MHz when acting as reader. All values should be multiples of 16
+#define DELAY_ISO15693_VCD_TO_VICC_READER 1056 // 1056/3,39MHz = 311.5us from end of command EOF to start of tag response
+#define DELAY_ISO15693_VICC_TO_VCD_READER 1024 // 1024/3.39MHz = 302.1us between end of tag response and next reader command
+
+void Iso15693InitReader();
+void CodeIso15693AsReader(uint8_t *cmd, int n);
+void CodeIso15693AsTag(uint8_t *cmd, size_t len);
+void TransmitTo15693Reader(const uint8_t *cmd, size_t len, uint32_t *start_time, uint32_t slot_time, bool slow);
+int GetIso15693CommandFromReader(uint8_t *received, size_t max_len, uint32_t *eof_time);
+void TransmitTo15693Tag(const uint8_t *cmd, int len, uint32_t *start_time);
+int GetIso15693AnswerFromTag(uint8_t* response, uint16_t max_len, uint16_t timeout, uint32_t *eof_time);
+void SnoopIso15693(uint8_t jam_search_len, uint8_t *jam_search_string);