在某些情况下，即便采用标准数据包格式，用户仍希望使用高级命令发送数据包。这可能是因为用户需要发送标准 TX 命令所不支持的更长前导码，侦听模式应用就是典型场景。

SysConfig (3) 和 SmartRF Studio (2) 均支持导入和导出 PHY 默认配置以外的其他命令。图 2-2 展示了如何使用 SysConfig 选择要导入到项目中的额外命令，而且图 2-3 展示了如何使用 SmartRF Studio 进行代码导出以完成此操作。

通过这种方式添加额外命令时，SmartRF Studio 与 SysConfig 生成的配置并不完全相同，因此示例代码的编写兼容了两种工具的输出结果。使用高级 TX 命令时，长度字节必须与有效载荷一起手动写入数据包，并且命令的 .pktLen 字段必须同时包含长度字段和有效载荷长度。代码示例如下所示。

1:  //---------------------------------------------------------------------------------------------
2:  // Transmit Standard Packet Format with CMD_PROP_TX_ADV (1 Length Byte)
3:  //---------------------------------------------------------------------------------------------
4:
5:  // Defines
6:  #define PAYLOAD_LENGTH 3 // Max 255 bytes
7:  #define LENGTH_FIELD   1
8:
9:  uint8_t packet[LENGTH_FIELD + PAYLOAD_LENGTH];
10:
11: static RF_Object rfObject;
12: static RF_Handle rfHandle;
13:
14: void *mainThread(void *arg0)
15: {
16:     RF_Params rfParams;
17:     RF_Params_init(&rfParams);
18:
19:     RF_cmdPropTxAdv.numHdrBits = 0x0; // Settings that must change to support 
20:                                       // the standard packet format
21:
22:     RF_cmdPropTxAdv.pktLen = LENGTH_FIELD + PAYLOAD_LENGTH; // Application specific settings
23:     RF_cmdPropTxAdv.pPkt = packet;                          
24:
25:     // Settings to modify if going from a PHY that uses the standard TX command 
26:     // to use the advanced TX command
27:     RF_cmdPropTxAdv.condition.rule = 0x1;
28:     RF_cmdPropTxAdv.pktConf.bUseCrc = 0x1;
29:
30:     rfHandle = RF_open(&rfObject, &RF_prop, (RF_RadioSetup*)&RF_cmdPropRadioDivSetup,
31:                        &rfParams);
31:     RF_postCmd(rfHandle, (RF_Op*)&RF_cmdFs, RF_PriorityNormal, NULL, 0);
32:
33:     while(1)
34:     {
35:         //-------------------------------------------------------------------------------------
36:         // Could be placed outside the while(1) since the packet does not change
37:         packet[0] = PAYLOAD_LENGTH;
38:
39:         for (uint16_t i = 1; i < (LENGTH_FIELD + PAYLOAD_LENGTH); i++)
40:         {
41:             packet[i] = i;
42:         }
43:         //-------------------------------------------------------------------------------------
44:         RF_runCmd(rfHandle, (RF_Op*)&RF_cmdPropTxAdv, RF_PriorityNormal, NULL, 0);
45:         RF_yield(rfHandle);
46:         usleep(500000);
47:     }
48: }