yoyo1101,谢谢你百忙中的答复,毫无疑问,你是我心眼里最可爱的人, 以至我都想以身相许,可惜我也是男人呀. 下面咱还要提提我的问题呢. 问题在我看来是解决了,程序源代码如下,不知道是不是对呢? PCI-9114HG的multiple AD-Channels一起连续采集时,是怎样一个时序呢? 请结合以下程序给咱点拨点拨. 我在程序中设置Scan Rate为2000Hz(Per channel),即0.5ms;总采样频率为 2000Hz*32通道=64000Hz. PCI-9114HG在采集时是不是每个扫描间隔(即每0.5ms)每道转换一个样点, 这样0至31通道都各得到一个样点(姑且称为一帧)? 道间切换的时差是多少呢,可以不用考虑吗? 程序中32个通道每个通道都采了16K个样点,那么总计花了多少时间呢, 该怎么计算? 还有,the size of circular AI-Buffer是多少? AI_AsyncDblBufferHalfReady时即半满时,能读回来几个样点? //以下是程序源代码: // // P9114AsyncCAI.cpp // // // Before using this program,you must use the utility-- // "NuDAQ PCI Configuration Utility"--to allocate at least 256KBytes // memory spaces for AI-Buffer. // // 32Channels*2048Samples*4Bytes(size of per sample) = 256KBytes // #include <windows.h> #include <stdio.h> #include <conio.h> #include "dask.h" // PCI_9114HG : Continuous AI //constants definition #define CardNumber 0 #define ADChanCount 32 #define LastADChan (ADChanCount-1) #define ScanCount 2048 #define SampleRate 64000.0000 //Scan Rate(Hz): 64000.0000/32 = 2K //Sampling-Length per AD channel,in samples #define SampLen 16384 //variables definition I16 cardID = -1; I16 err=0; BOOLEAN fstop = 0; BOOLEAN HalfReady = 0; U32 AccessCnt = 0; U32 MemSize = 0; U32 InBuf[32*SampLen]; //AI data buffer F64 vaiData[32*SampLen];//volt-value of AI data //total numbers of current transferred samples U32 CurSamples = 0; int main(int argc, char* argv[]) { FILE* fp; int SampNo,ADChan; char szLine[1024]; char szTmp[100]; fp = fopen("D:\\P9114AsyncCAI.TXT","w+t"); if(fp==NULL) { printf("not found file.\n"); exit(1); } cardID = Register_Card(PCI_9114HG, CardNumber); if (cardID<0) { //Error occurs !! //ToDo : Handle error here printf("Error: Register_Card(). errcode=%d\n",cardID); exit(1); } err = AI_InitialMemoryAllocated(cardID,&MemSize); if (err!=NoError) { //Error occurs !! //ToDo : Handle error here printf("Error: AI_InitialMemoryAllocated().\n"); exit(1); } else printf("Ok : MemSize=%d KB!\n",MemSize); if (MemSize*1024 < ScanCount*ADChanCount*sizeof(U32) ) { //available memory size for analog input in the device driver //is smaller than the data size specified!! //ToDo : do something here printf("Error: AI-Buffer is too small!\n"); exit(1); } err = AI_AsyncDblBufferMode(cardID, 1);//enable double-buffer mode if (err!=NoError) { //Error occurs !! //ToDo : Handle error here printf("Error: AI_AsyncDblBufferMode().errcode = %d\n",err); exit(1); } err=AI_9114_Config(cardID, TRIG_INT_PACER); if (err!=NoError) { //Error occurs !! //ToDo : Handle error here printf("Error: AI_9114_Config().errcode=%d\n",err); exit(1); } err=AI_ContScanChannels (cardID, LastADChan, AD_B_10_V,NULL, ScanCount*ADChanCount, SampleRate, ASYNCH_OP); if (err!=NoError) { //Error occurs !! //ToDo : Handle error here printf("Error: AI_ContScanChannels(). errcode = %d\n",err); exit(1); } do { do { AI_AsyncDblBufferHalfReady (cardID, &HalfReady, &fstop); } while (!HalfReady); //half buffer data is ready for read AI_AsyncDblBufferTransfer (cardID, &InBuf[CurSamples] ); CurSamples += ScanCount/2; printf("CurSamples = %lu\n",CurSamples); } while (CurSamples<ADChanCount*SampLen); printf("sampling completed!\n"); err = AI_AsyncClear(cardID, &AccessCnt); if (err!=NoError) { //Error occurs !! //ToDo : Handle error here printf("Error: AI_AsyncClear().errcode=%d\n",err); } printf("Now converting the acquired data to volt values...\n"); err = AI_ContVScale(cardID,AD_B_10_V,InBuf,vaiData,ADChanCount*SampLen); if (err!=NoError) { //Error occurs !! //ToDo : Handle error here printf("Error: AI_C