added data structures

added audio support
added rfid support
added spi support

ext/rfid/MFRC522.h

@@ -0,0 +1,74 @@
+#ifndef MFRC522_H
+#define MFRC522_H
+
+#include "../../io/SoftSPI.h"
+
+/**
+ * RFID reader based on MFRC522
+ * attached via SPI
+ *
+ * http://www.nxp.com/documents/data_sheet/MFRC522.pdf
+ *
+ */
+class MFRC522 {
+
+	struct OP {
+		uint8_t addr : 7;		// bits 0-6
+		uint8_t rw : 1;			// bit 7 [MSB] 1 = read, 0 = write
+	};
+
+	enum class Register {
+
+		COMMAND_REG = 0x01,
+		INTERRUPTS_REG = 0x02,
+		ERROR_REG = 0x06,
+		STATUS1_REG = 0x07,
+		STATUS2_REG = 0x08,
+		FIFI_DATA_REG = 0x09,	// access fifo buffer
+		FIFO_SIZE_REG = 0x0A,	// number of available fifo data
+		MOD_REG = 0x11,
+		DEMOG_REG = 0x19,
+
+		TEST_SEL_1_REG = 0x31,
+		TEST_SEL_2_REG = 0x32,
+		VERSION_REG = 0x37,		// software version
+
+	};
+
+	struct CommandReg {
+		uint8_t command : 4;
+		uint8_t power_down : 1;
+		uint8_t receiver_off : 1;
+		uint8_t reserved : 2;
+	};
+
+	struct InterruptsReg {
+		uint8_t timerInterruptEnable : 1;
+		uint8_t errorInterruptEnable : 1;
+		uint8_t loAlertInterruptEnable : 1;
+		uint8_t hiAlertInterruptEnable : 1;
+		uint8_t idleInterruptEnable : 1;
+		uint8_t rxInterruptEnable : 1;
+		uint8_t txInterruptEnable : 1;
+		uint8_t inverted : 1;
+	};
+
+private:
+
+	SoftSPI spi;
+
+public:
+
+	MFRC522() {
+		;
+	}
+
+	/** init */
+	void init() {
+		spi.init();
+	}
+
+
+};
+
+#endif // MFRC522_H