Started rf24 with SPI.

rf24/nRF24L01.h

@@ -0,0 +1,26 @@
+#ifndef NRF24L01_H_
+#define NRF24L01_H_
+
+#define CONFIG      0x00
+#define MASK_RX_DR  6
+#define MASK_TX_DS  5
+#define MASK_MAX_RT 4
+#define EN_CRC      3
+#define CRCO        2
+#define PWR_UP      1
+#define PRIM_RX     0
+
+#define STATUS      0x07
+#define RX_DR       6
+#define TX_DS       5
+#define MAX_RT      4
+#define RX_P_NO     3 // 3 bits
+#define TX_FULL     0
+
+#define R_REGISTER  0x00
+#define W_REGISTER  0x20
+#define REG_MASK    0x1f
+
+// TODO
+
+#endif