The header is written to the packet with least significant byte first, so the packet that the CMD_PROP_TX_ADV command should transmit, would be 0x07, 0x08, 0x01, 0x02, 0x03.

Since the length field is 11 bits the max number of payload bytes are 2045 when using a 2 byte long CRC, and 2043 when the CRC is 4 bytes long. The following shows code that can be used to transmit a packet using the advanced packet format.

1:  //---------------------------------------------------------------------------------------------
2:  // Transmit Advanced Packet Format with CMD_PROP_TX_ADV
3:  //---------------------------------------------------------------------------------------------
4:
5:  // Defines
6:  #define PAYLOAD_LENGTH 3 // Max 2045 or 2043, depending on FSC type
7:  #define HEADER_FIELD   2
8:
9:  // #define _802_15_4_G_HEADER   0x00 // MS = 0, FCS = 0 (4 bytes CRC), DW = 0 (Whitening Off)
10: #define _802_15_4_G_HEADER      0x08 // MS = 0, FCS = 0 (4 bytes CRC), DW = 1 (Whitening On)
11: // #define _802_15_4_G_HEADER   0x10 // MS = 0, FCS = 1 (2 bytes CRC), DW = 0 (Whitening Off)
12: // #define _802_15_4_G_HEADER   0x18 // MS = 0, FCS = 1 (2 bytes CRC), DW = 1 (Whitening On)
13:
14: uint8_t packet[HEADER_FIELD + PAYLOAD_LENGTH];
15: uint16_t header;
16:
17: static RF_Object rfObject;
18: static RF_Handle rfHandle;
19:
20: void *mainThread(void *arg0)
21: {
22:     RF_Params rfParams;
23:     RF_Params_init(&rfParams);
24:
25:     RF_cmdPropTxAdv.startTrigger.triggerType = 0x0; // Application specific settings
26:     RF_cmdPropTxAdv.startTrigger.pastTrig = 0x0;
27:     RF_cmdPropTxAdv.pktLen = HEADER_FIELD + PAYLOAD_LENGTH;
28:     RF_cmdPropTxAdv.preTrigger.triggerType = 0x0;
29:     RF_cmdPropTxAdv.preTrigger.pastTrig = 0x0;
30:     RF_cmdPropTxAdv.pPkt = packet;
31:
32:     rfHandle = RF_open(&rfObject, &RF_prop, (RF_RadioSetup*)&RF_cmdPropRadioDivSetup,
33:                        &rfParams);
34:     RF_postCmd(rfHandle, (RF_Op*)&RF_cmdFs, RF_PriorityNormal, NULL, 0);
35:
36:     while(1)
37:     {
38:         //-------------------------------------------------------------------------------------
39:         // Could be placed outside the while(1) since the packet does not change
40:         if((_802_15_4_G_HEADER == 0x00) || (_802_15_4_G_HEADER == 0x08))
41:         {
42:             header = (_802_15_4_G_HEADER << 8) + ((4 + PAYLOAD_LENGTH) & 0x07FF);
43:         }
44:         else
45:         {
46:             header = (_802_15_4_G_HEADER << 8) + ((2 + PAYLOAD_LENGTH) & 0x07FF);
47:         }
48:         packet[0] = (uint8_t)(header);
49:         packet[1] = (uint8_t)(header >> 8);
50:
51:         for (uint16_t i = 2; i < (HEADER_FIELD + PAYLOAD_LENGTH); i++)
52:         {
53:             packet[i] = i - 1;
54:         }
55:         //-------------------------------------------------------------------------------------
56:         RF_runCmd(rfHandle, (RF_Op*)&RF_cmdPropTxAdv, RF_PriorityNormal, NULL, 0);
57:         RF_yield(rfHandle);
58:         usleep(500000);
59:     }
60: }