关于DMA传输数据。DMA的数据保存到哪了？程序最后是DMA数据存储，我想知道这个数据存到哪里了，我该怎么找到这个数据

[bifeng8467]

程序如下：
using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
using Spcm;

namespace CSharp
{
class CSharp
{
static int Main()
{
IntPtr hDevice, pBuffer;
GCHandle hBufferHandle;
int lErrorVal, lCardType, lSerialNumber, lMaxChannels, lBytesPerSample, lValue;
uint dwErrorReg, dwErrorCode;
long i, llMemSet, llAverage, llInstMem, llMaxSamplerate;
short nMin, nMax;
short[] nData;
sbyte[] byData;

StringBuilder sErrorText = new StringBuilder(1024);

llMemSet = 16384;

// ----- open card -----
hDevice = Drv.spcm_hOpen("/dev/spcm0");
if ((int)hDevice == 0)
{
Console.WriteLine("Error: Could not open card\n");
return 1;
}

// ----- get card type -----
dwErrorCode = Drv.spcm_dwGetParam_i32(hDevice, Regs.SPC_PCITYP, out lCardType);
dwErrorCode = Drv.spcm_dwGetParam_i32(hDevice, Regs.SPC_PCISERIALNR, out lSerialNumber);

switch (lCardType & CardType.TYP_SERIESMASK)
{
case CardType.TYP_M2ISERIES:
Console.WriteLine("M2i.{0:x} sn {1}\n", lCardType & CardType.TYP_VERSIONMASK, lSerialNumber);
break;

case CardType.TYP_M2IEXPSERIES:
Console.WriteLine("M2i.{0:x}-Exp sn {1}\n", lCardType & CardType.TYP_VERSIONMASK, lSerialNumber);
break;

case CardType.TYP_M3ISERIES:
Console.WriteLine("M3i.{0:x} sn {1}\n", lCardType & CardType.TYP_VERSIONMASK, lSerialNumber);
break;

case CardType.TYP_M3IEXPSERIES:
Console.WriteLine("M3i.{0:x}-Exp sn {1}\n", lCardType & CardType.TYP_VERSIONMASK, lSerialNumber);
break;

case CardType.TYP_M4IEXPSERIES:
Console.WriteLine("M4i.{0:x}-x8 sn {1}\n", lCardType & CardType.TYP_VERSIONMASK, lSerialNumber);
break;

default: Console.WriteLine("Typ: {0:x} not supported so far\n", lCardType);
break;
}

// ----- get max memsize -----
dwErrorCode = Drv.spcm_dwGetParam_i64(hDevice, Regs.SPC_PCIMEMSIZE, out llInstMem);
Console.WriteLine(" Installed memory : {0} MByte", llInstMem / 1024 / 1024);

// ----- get max samplerate -----
dwErrorCode = Drv.spcm_dwGetParam_i64(hDevice, Regs.SPC_MIINST_MAXADCLOCK, out llMaxSamplerate);
Console.WriteLine(" Max sampling rate : {0} MS/s", llMaxSamplerate / 1000000);

// ----- get max number of channels -----
dwErrorCode = Drv.spcm_dwGetParam_i32(hDevice, Regs.SPC_MIINST_MODULES, out lValue);
dwErrorCode = Drv.spcm_dwGetParam_i32(hDevice, Regs.SPC_MIINST_CHPERMODULE, out lMaxChannels);
lMaxChannels *= lValue;
Console.WriteLine(" Channels : {0}", lMaxChannels);

// ----- get kernel version -----
dwErrorCode = Drv.spcm_dwGetParam_i32(hDevice, Regs.SPC_GETKERNELVERSION, out lValue);
Console.WriteLine(" Kernel Version : {0}.{1} build {2}", lValue >> 24, (lValue >> 16) & 0xff, lValue & 0xffff);

// ----- get library version -----
dwErrorCode = Drv.spcm_dwGetParam_i32(hDevice, Regs.SPC_GETDRVVERSION, out lValue);
Console.WriteLine(" Library Version : {0}.{1} build {2}", lValue >> 24, (lValue >> 16) & 0xff, lValue & 0xffff);

// ----- get bytes per sample -----
dwErrorCode = Drv.spcm_dwGetParam_i32(hDevice, Regs.SPC_MIINST_BYTESPERSAMPLE, out lBytesPerSample);

// ----- setup card -----
dwErrorCode = Drv.spcm_dwSetParam_i32(hDevice, Regs.SPC_AMP0, 1000);
dwErrorCode = Drv.spcm_dwSetParam_i32(hDevice, Regs.SPC_CARDMODE, Regs.SPC_REC_STD_SINGLE);
dwErrorCode = Drv.spcm_dwSetParam_i32(hDevice, Regs.SPC_CHENABLE, 1);

// Hint : To program all 64 channels of a digital card, the following typecast is necessary
//dwErrorCode = Drv.spcm_dwSetParam_i64(hDevice, Regs.SPC_CHENABLE, unchecked((long)0xFFFFFFFFFFFFFFFF));

dwErrorCode = Drv.spcm_dwSetParam_i64(hDevice, Regs.SPC_MEMSIZE, llMemSet);
dwErrorCode = Drv.spcm_dwSetParam_i64(hDevice, Regs.SPC_POSTTRIGGER, llMemSet/2);
dwErrorCode = Drv.spcm_dwSetParam_i32(hDevice, Regs.SPC_CLOCKMODE, Regs.SPC_CM_INTPLL);
dwErrorCode = Drv.spcm_dwSetParam_i32(hDevice, Regs.SPC_SAMPLERATE, 100000);
dwErrorCode = Drv.spcm_dwSetParam_i32(hDevice, Regs.SPC_TRIG_ORMASK, Regs.SPC_TMASK_SOFTWARE);

// ----- check error code and print error message -----
if (dwErrorCode != 0)
{
Drv.spcm_dwGetErrorInfo_i32 (hDevice, out dwErrorReg, out lErrorVal, sErrorText);
Console.WriteLine("\nError occurred : {0}", sErrorText);
}

// ----- start card and wait until acquisition has finished -----
Console.Write("\n Start acquisition ..... ");
dwErrorCode = Drv.spcm_dwSetParam_i32 (hDevice, Regs.SPC_M2CMD, Regs.M2CMD_CARD_START | Regs.M2CMD_CARD_ENABLETRIGGER | Regs.M2CMD_CARD_WAITREADY);
Console.WriteLine("done");

// ----- set data transfer function -----
if (lBytesPerSample == 2)
{
// ----- 12, 14, 16 bit per sample -----
nData = new short[llMemSet];
byData = null;

// ----- lock memory -----
hBufferHandle = GCHandle.Alloc(nData, GCHandleType.Pinned);
}
else
{
// ----- 8 bit per sample -----
byData = new sbyte[llMemSet];
nData = null;

// ----- lock memory -----
hBufferHandle = GCHandle.Alloc(byData, GCHandleType.Pinned);
}

// ----- get pointer to locked memory -----
pBuffer = hBufferHandle.AddrOfPinnedObject();

dwErrorCode = Drv.spcm_dwDefTransfer_i64(hDevice, Drv.SPCM_BUF_DATA, Drv.SPCM_DIR_CARDTOPC, 0, pBuffer, 0, (ulong)(lBytesPerSample * llMemSet));

// ----- start DMA data transfer and wait until transfer has finished -----
Console.Write(" Start data transfer ... ");
dwErrorCode = Drv.spcm_dwSetParam_i32(hDevice, Regs.SPC_M2CMD, Regs.M2CMD_DATA_STARTDMA | Regs.M2CMD_DATA_WAITDMA);
Console.WriteLine("done");


求问最后这个DMA存到哪了

[bifeng8467]

这个类的源代码应该怎么弄那

[shoppo0505]

Drv类源代码没有，不知道如何处理的。