最近一直在看SKYWORKS805芯片的GSM通信源代码，有几处源代码的意思不是很懂。想请教一下各位，有人知道下面源代码操作的意义是什么吗？
第一处：
#define HWTraceDoAGCBound(P1,P2,P3,P4,P5)GSMExternalTrace(4096,P1,P2,P3,P4,P5)
#define HWTraceDoAGCTweak(P1,P2,P3,P4,P5)GSMExternalTrace(4097,P1,P2,P3,P4,P5)
#define HWTraceAGCOldBound(P1,P2,P3,P4)GSMExternalTrace(4098,P1,P2,P3,P4)
#define HWTraceFCChFirst(P1)GSMExternalTrace(4099,P1)
#define HWTraceFCChSecond(P1)GSMExternalTrace(4100,P1)
#define HWTraceFCChFrgve(P1)GSMExternalTrace(4101,P1)
#define HWTraceFCChLastFrgve(P1)GSMExternalTrace(4102,P1)
#define HWTraceFCChSChFrgve(P1)GSMExternalTrace(4103,P1)
#define HWTraceFCChEval(P1,P2,P3,P4)GSMExternalTrace(4104,P1,P2,P3,P4)
#define HWTraceDoSingleRACh(P1,P2)GSMExternalTrace(4105,P1,P2)
#define HWTraceGotDLFACCh()GSMExternalTrace(4106)
#define HWTraceDoTCh(P1,P2)GSMExternalTrace(4107,P1,P2)
#define HWTraceDoFACCh(P1,P2,P3)GSMExternalTrace(4108,P1,P2,P3)
#define HWTraceDoTChSACCh(P1,P2)GSMExternalTrace(4109,P1,P2)

#pragma arm section code = "IRAM_SKY_CODE"

void GSMExternalTrace(UINT32 Trace, ...)

{
va_list ArgPtr;
UINT16 Control;
INT16ParamsSize;
UINT8*TraceBuffer;

if (!TraceHostConnected)
return;

if ((ParamsSize = GetParamsControl(Trace, &Control))<0)
return;



TraceBuffer = CreateBuffer(Trace, (UINT16)ParamsSize);
if (TraceBuffer == NULL)

return;

va_start(ArgPtr, Trace);
FillParams(&TraceBuffer[7], ArgPtr, Control, ParamsSize);
#ifdef __GPRS_SIM__
GSMSendMessage(TRSAP, TRInfoInd, TraceBuffer);
#else
SEND(TRInfoInd)(TraceBuffer);
#endif
#ifndef __C166__
va_end(ArgPtr);
#endif
}

#pragma arm section code

这个函数在很多地方用到，不是很明白。

第二处：
#define DSP_WRITE_IA_ASYNC0x01
#define DSP_WRITE_IA_SYNCA0x02
#define DSP_WRITE_IA_SYNCB0x03
#define DSP_WRITE_IA_SYNCC0x04
#define DSP_WRITE_IA_SYNCD0x05

#define DSP_WRITE_IA_ASYNC_CMD(DSP_WRITE_IA_ASYNC<<8)
#define DSP_WRITE_IA_SYNCA_CMD(DSP_WRITE_IA_SYNCA<<8)
#define DSP_WRITE_IA_SYNCB_CMD(DSP_WRITE_IA_SYNCB<<8)
#define DSP_WRITE_IA_SYNCC_CMD(DSP_WRITE_IA_SYNCC<<8)
#define DSP_WRITE_IA_SYNCD_CMD(DSP_WRITE_IA_SYNCD<<8)

#define DSP_WRITE_IA_ASYNC_LEN(x)(DSP_WRITE_IA_ASYNC_CMD+x)
#define DSP_WRITE_IA_SYNCA_LEN(x)(DSP_WRITE_IA_SYNCA_CMD+x)
#define DSP_WRITE_IA_SYNCB_LEN(x)(DSP_WRITE_IA_SYNCB_CMD+x)
#define DSP_WRITE_IA_SYNCC_LEN(x)(DSP_WRITE_IA_SYNCC_CMD+x)
#define DSP_WRITE_IA_SYNCD_LEN(x)(DSP_WRITE_IA_SYNCD_CMD+x)

加这个“X”是什么意思？