Added ack payload. Added a sample using pingpair as a base with minimal changes.

nRF24L01.h

@@ -47,6 +47,8 @@
 #define RX_PW_P4    0x15
 #define RX_PW_P5    0x16
 #define FIFO_STATUS 0x17
+#define DYNPD	    0x1C
+#define FEATURE	    0x1D
 
 /* Bit Mnemonics */
 #define MASK_RX_DR  6
@@ -87,13 +89,25 @@
 #define TX_EMPTY    4
 #define RX_FULL     1
 #define RX_EMPTY    0
+#define DPL_P5	    5
+#define DPL_P4	    4
+#define DPL_P3	    3
+#define DPL_P2	    2
+#define DPL_P1	    1
+#define DPL_P0	    0
+#define EN_DPL	    2
+#define EN_ACK_PAY  1
+#define EN_DYN_ACK  0
 
 /* Instruction Mnemonics */
 #define R_REGISTER    0x00
 #define W_REGISTER    0x20
 #define REGISTER_MASK 0x1F
+#define ACTIVATE      0x50
+#define R_RX_PL_WID   0x60
 #define R_RX_PAYLOAD  0x61
 #define W_TX_PAYLOAD  0xA0
+#define W_ACK_PAYLOAD 0xA8
 #define FLUSH_TX      0xE1
 #define FLUSH_RX      0xE2
 #define REUSE_TX_PL   0xE3