How do I get callback or windows messaging Events working on a 6534 card do pattern output?

Question

Hi,
I am working on a fast track project and I am trying unsuccesfully to get my buffered output to work. I have 827 different size buffers of data that I need to output to a digital output. I need to wait until each buffer is output, then call some other functions before outputing the next buffer.
Although I only want to set one bit on and off I have i16 buffers that contains my data. I have based my program on the 6523SingleBufferedOutput NI-DAQ example. However I do not want to poll the number of buffer elements remaining, I want to use the NI-DAQ event message to tell my code when the DIG_Block_Out function is complete. This appears to be message type 2. I am basing the ev
ent code from another example in the Function Reference Manual. I have tried both a callback and an window message, but neither function is ever called. I am not sure if the problem is to do with the event configuration or the DO not completing. It does look like only part of my data is being output, however I tried with message type to send a message after n scans and it did not call my functions either.
I can send code to anyone who is willing to help. Help would be really be appreciated as I am behind now on my project,
Thanks,
David

Answer 1

Here is the code
CImagePipeline::CImagePipeline(CGilbertDlg* pGilbertDlg, CSettings* pPrintSettings, CFloydFile* pDataFile) :
m_pGilbertDlg(pGilbertDlg), m_pPrintSettings(pPrintSettings), m_pImageFile(pDataFile), m_nPgTB(0), m_nReqInt(0),
iRetVal(0), iDevice(1), iGroup (1), iGroupSize (2), iPort (0), iDir (1)
, iPgConfig (1), iReqSource (0), iExtGate (0), iStartTrigON (1), iStartTrigOFF (0)
, iStartPol (0), iStopTrig (0), iStopPol (0), ulPtsAfterStopTrig (0), ulPattern (0)
, ulPatternMask (0), iResource (11), ulRemaining (1), ulAlignIndex (0), iIgnoreWarning (0)
, iYieldON (1), iDBModeON (1), iDBModeOFF(0), iOldDataStop(1), iPartialTransfer(0), lTimeout(180)
, m_nStatus(0), iStatus(0), ulCount(0), ulBufferSize(0)
CalculateTimebase();
Cleanup();
CleanupNIDAQEvents();
ReformatPipelineData();
m_nStatus = Configure();
iStatus = SetupNIDAQEvents();
if (iStatus != 0)
iRetVal = NIDAQErrorHandler(iStatus, "SetupNIDAQEvents",
iIgnoreWarning);
//##ModelId=3D496BB30271
CImagePipeline::~CImagePipeline()
CleanupNIDAQEvents();
Cleanup();
i16 CImagePipeline:etupNIDAQEvents()
// declare/initialize local variables
short iErr = 0,
iDevCode = 0,
iTimeBase = 0;
static short
ipBuffer[1000] = {0};
unsigned short
uSampInterval = 0;
unsigned long
ulCount = 1000;
char cpChanStr[5] = {0};
* INITIALIZE DAQ Device (optional)
iErr = Init_DA_Brds(iDevice, &iDevCode);
CHECK_RETURN_CONDITION(iErr);
* CONFIGURE DAQ Event
// setup channel string for DAQ Event
wsprintf(cpChanStr, "DOGRP%-d\0", iGroup);
// call Config_DAQ_Event_Message
iErr = Config_DAQ_Event_Message(iDevice,
(i16) 1, // add message
cpChanStr, // channel string
(i16) 1,// daq event type
(i32) 1,// DAQTrigVal0
(i32) 0,// DAQTrigVal1
(u32) 0,// trigSkipCount
(u32) 0,// preTrigScans
(u32) 0,// postTrigScans
m_pGilbertDlg->m_hWnd,// handle
(i16) WM_NIDAQ_MSG,// message
(u32) NULL);// callbackAddr
CHECK_RETURN_CONDITION(iErr);
iErr = Config_DAQ_Event_Message(iDevice,
(i16) 1, // add message
cpChanStr, // channel string
(i16) 2,// daq event type
(i32) 0,// DAQTrigVal0
(i32) 0,// DAQTrigVal1
(u32) 0,// trigSkipCount
(u32) 0,// preTrigScans
(u32) 0,// postTrigScans
NULL,// handle
(i16) NULL,// message
(u32) &mycallback);// callbackAddr
CHECK_RETURN_CONDITION(iErr);
return 0;
// FUNCTION: CleanupNIDAQEvents
// CHANGE THIS AS NECESSARY
void CImagePipeline::CleanupNIDAQEvents()
* Stop async operation
DAQ_Clear(iDevice);
* CLEAR all DAQ Events!
Config_DAQ_Event_Message(iDevice,
(i16) 0,
(i16) 2,
(i32) 0,
(i32) 0,
(u32) 0,
(u32) 0,
(u32) 0,
NULL,
(i16) NULL,
(u32) NULL);
void mycallback(short handle, short msg, unsigned short wParam, unsigned long lParam)
short doneFlag = (wParam & 0xFF00) >> 8;
if (doneFlag)
if (!SetEvent(CGilbertDlg::m_hTrackDone))
DWORD dwErrorCode = GetLastError();
void CImagePipeline::GenerateSingleTrackData(int trackNum)
static i16 piBuffer[400] = {0};
u32 ulCount = 200;
iStatus = NIDAQMakeBuffer(piBuffer, ulCount, WFM_DATA_I16);
if (iStatus == 0)
m_nStatus = Configure();
ulBufferSize = ulCount * 2;
iStatus = Align_DMA_Buffer(iDevice, iResource, piBuffer,
ulCount, ulBufferSize, &ulAlignIndex);
iRetVal = NIDAQErrorHandler(iStatus, "Align_DMA_Buffer",
iIgnoreWarning);
/* Start the pattern generation output of 100 "items" upon the
digital start trigger. */
iStatus = DIG_Block_Out(iDevice, iGroup, piBuffer, ulCount+1);
iRetVal = NIDAQErrorHandler(iStatus, "DIG_Block_Out",
iIgnoreWarning);
else {
AfxMessageBox(" The buffer was not made correctly. Check the parameters for NIDAQMakeBuffer.");
short CImagePipeline::Configure()
short status = 0;
iStatus = DIG_Grp_Config(iDevice, iGroup, iGroupSize, iPort,
iDir);
if (iStatus != 0)
iRetVal = NIDAQErrorHandler(iStatus, "DIG_Grp_Config",
iIgnoreWarning);
status = iStatus;
/* Configure internally timed pattern generation with timebase
m_nPgTB, interval m_nReqInt, and no external gating. */
iStatus = DIG_Block_PG_Config(iDevice, iGroup, iPgConfig,
iReqSource, m_nPgTB, m_nReqInt, iExtGate);
if (iStatus != 0)
iRetVal = NIDAQErrorHandler(iStatus, "DIG_Block_PG_Config",
iIgnoreWarning);
status = iStatus;
/* Configure for digital start trigger. */
iStatus = DIG_Trigger_Config(iDevice, iGroup, iStartTrigOFF,
iStartPol, iStopTrig, iStopPol, ulPtsAfterStopTrig, ulPattern,
ulPatternMask);
if (iStatus != 0)
iRetVal = NIDAQErrorHandler(iStatus, "DIG_Trigger_Config",
iIgnoreWarning);
status = iStatus;
return status;
int CImagePipeline::Cleanup()
/* CLEANUP - Don't check for errors on purpose. */
/* Set trigger mode to initial state. */
iStatus = DIG_Trigger_Config(iDevice, iGroup, iStartTrigOFF,
iStartPol, iStopTrig, iStopPol, ulPtsAfterStopTrig, ulPattern,
ulPatternMask);
/* Clear the block operation. */
iStatus = DIG_Block_Clear(iDevice, iGroup);
/* Unconfigure group. */
iStatus = DIG_Grp_Config(iDevice, iGroup, 0, 0, 0);
int numTracks = m_pImageFile->m_FileHeader.get_NumTracks();
for (int trackNum = 0; trackNum < numTracks; trackNum++)// loop through all tracks
if (m_vTrackData.size()>0)
if (m_vTrackData.at(trackNum))
delete m_vTrackData.at(trackNum);
return iStatus;
void CImagePipeline::CleanupNIDAQEvents()
* Stop async operation
DAQ_Clear(iDevice);
* CLEAR all DAQ Events!
Config_DAQ_Event_Message(iDevice,
(i16) 0,
(i16) 2,
(i32) 0,
(i32) 0,
(u32) 0,
(u32) 0,
(u32) 0,
NULL,
(i16) NULL,
(u32) NULL);