以下代码可用于使用高级数据包格式接收数据包。此代码仅可用于默认通过高级命令进行导出/导入的 PHY 设置。

1:   //--------------------------------------------------------------------------------------------
2:   // Receive Advanced Packet Format with CMD_PROP_RX_ADV
3:   //--------------------------------------------------------------------------------------------
4:
5:   // Defines
6:   #define DATA_ENTRY_HEADER_SIZE  8 // Constant header size of a Generic Data Entry
7:   #define NUM_DATA_ENTRIES        2 // NOTE: Only two data entries supported
8:   #define CRC                     4 // 4/2 (based on FCS) if .rxConf.bIncludeCrc = 0x1, else 0
9:   #define RSSI                    1 // 1 if .rxConf.bAppendRssi = 0x1, 0 otherwise
10:  #define TIMESTAMP               4 // 4 if .rxConf.bAppendTimestamp = 0x1, 0 otherwise
11:  #define STATUS                  1 // 1 if .rxConf.bAppendStatus = 0x1, 0 otherwise
12:  #define HEADER_FIELD            2 // RF_cmdPropRx.rxConf.bIncludeHdr = 0x1
13:  #define MAX_LENGTH              2047 // Max length the radio will accept (incl. CRC bytes)
14:  #define NUM_APPENDED_BYTES      HEADER_FIELD + RSSI + TIMESTAMP + STATUS
15:
16:  uint8_t packet[MAX_LENGTH + NUM_APPENDED_BYTES - HEADER_FIELD]; // Header/Length stored in 
17:  uint16_t packetLength;                                          // packetLength variable
18:
19:  static void callback(RF_Handle h, RF_CmdHandle ch, RF_EventMask e);
20:
21:  static RF_Object rfObject;
22:  static RF_Handle rfHandle;
23:
24:  static uint8_t rxDataEntryBuffer[RF_QUEUE_DATA_ENTRY_BUFFER_SIZE(NUM_DATA_ENTRIES, 
25:                                   MAX_LENGTH, NUM_APPENDED_BYTES)]__attribute__((aligned(4)));
26:  static dataQueue_t dataQueue;
27:  static rfc_dataEntryGeneral_t* currentDataEntry;
28:  static uint8_t* packetDataPointer;
29:  rfc_propRxOutput_t rxStatistics;
30:  uint16_t crc16;
31:  uint32_t crc32;
32:  int8_t rssi;
33:  uint32_t timestamp;
34:  uint8_t status;
35:
36:  void *mainThread(void *arg0)
37:  {
38:      RF_Params rfParams;
39:      RF_Params_init(&rfParams);
40:
41:      if(RFQueue_defineQueue(&dataQueue, rxDataEntryBuffer, sizeof(rxDataEntryBuffer), 
42:                             NUM_DATA_ENTRIES, MAX_LENGTH + NUM_APPENDED_BYTES))
43:      {
44:          while(1);
45:      }
46:
47:      RF_cmdPropRxAdv.pktConf.bRepeatOk = 0x1; // Application specific settings
48:      RF_cmdPropRxAdv.pktConf.bRepeatNok = 0x1;
49:      RF_cmdPropRxAdv.rxConf.bAutoFlushCrcErr = 0x1;
50:      RF_cmdPropRxAdv.maxPktLen = MAX_LENGTH;
51:      RF_cmdPropRxAdv.pQueue = &dataQueue;
52:
53:      RF_cmdPropRxAdv.pOutput = (uint8_t*)&rxStatistics; // Optional (for debug)
54:
55:      rfHandle = RF_open(&rfObject, &RF_prop, (RF_RadioSetup*)&RF_cmdPropRadioDivSetup, 
56:                         &rfParams);
57:      RF_postCmd(rfHandle, (RF_Op*)&RF_cmdFs, RF_PriorityNormal, NULL, 0);
58:      RF_runCmd(rfHandle, (RF_Op*)&RF_cmdPropRxAdv, RF_PriorityNormal, 
59:                &callback, RF_EventRxEntryDone);
60:      while(1);
61:  }
62:

63:  //--------------------------------------------------------------------------------------------
64:  // Callback for Receiving Advanced Packet Format with CMD_PROP_RX_ADV
65:  //--------------------------------------------------------------------------------------------
66:
67:  void callback(RF_Handle h, RF_CmdHandle ch, RF_EventMask e)
68:  {
69:      if(e & RF_EventRxEntryDone)
70:      {
71:          currentDataEntry = RFQueue_getDataEntry();
72:
73:          uint16_t header = ((uint16_t)(*(uint8_t*)(&currentDataEntry->data + 1) << 8) |
74:                             (uint16_t)(*(uint8_t*)(&currentDataEntry->data + 0) << 0));
75:
76:          bool fcs = (bool)(0x1000 & header);
77:
78:          packetLength = 0x07FF & header;
79:
80:          packetDataPointer = (uint8_t*)(&currentDataEntry->data + HEADER_FIELD);
81:
82:          memcpy(packet, packetDataPointer,
83:                 (packetLength + NUM_APPENDED_BYTES - HEADER_FIELD));
84:
85:          // The FCS field in the header tell us if the CRC is 2 or 4 bytes long
86:          if(fcs) // FCS = 1 -> 2 bytes CRC
87:          {
88:              crc16 = ((uint16_t)(packet[packetLength - 2] <<  8) +
89:              (uint16_t)(packet[packetLength - 1] <<  0));
90:          }
91:          else // FCS = 0 -> 4 bytes CRC
92:          {
93:              crc32 = ((uint32_t)(packet[packetLength - 4] << 24) +
94:                       (uint32_t)(packet[packetLength - 3] << 16) +
95:                       (uint32_t)(packet[packetLength - 2] <<  8) +
96:                       (uint32_t)(packet[packetLength - 1] <<  0));
97:          }
98:
99:          rssi = packet[packetLength + 0];
100:
101:         timestamp = ((uint32_t)(packet[packetLength + 1] << 0 ) +
102:                      (uint32_t)(packet[packetLength + 2] << 8 ) +
103:                      (uint32_t)(packet[packetLength + 3] << 16) +
104:                      (uint32_t)(packet[packetLength + 4] << 24));
105:
106:         status = packet[packetLength + 5];
107:
108:         RFQueue_nextEntry();
109:     }
110: }

此格式支持的最大数据包长度为 2047 字节（这包括 CRC（2 或 4 字节））。

请注意，IEEE 802.15.4g 未指定有效载荷（PSDU 数据）的格式。PSDU 仅被描述为位流，其内部数据格式由上层 MAC 规范决定。

在第 3.1.1 节和第 3.1.2 节中的代码示例中，有效载荷采用 MSB 优先的方式发送。为兼容 SmartRF Studio（默认情况下以 LSB 优先方式发送有效载荷），可以使用以下代码（RX 和 TX 端均适用）。

1:  //---------------------------------------------------------------------------------------------
2:  // Code for Converting Payload from MSB First to LSB First
3:  //---------------------------------------------------------------------------------------------
4:
5:  uint8_t lsbFirst(uint8_t b)
6:  {
7:      b = (b & 0xF0) >> 4 | (b & 0x0F) << 4;
8:      b = (b & 0xCC) >> 2 | (b & 0x33) << 2;
9:      b = (b & 0xAA) >> 1 | (b & 0x55) << 1;
10:     return b;
11: }