/// HIFN Gets all data packets that are available from a Sink VChan. The function allocates dynamically a data packet array with nPackets elements of DataPacket_type*
/// HIFN If there are no data packets in the Sink VChan, dataPackets = NULL, nPackets = 0 and the function returns immediately with 0 (success).
/// HIFN If an error is encountered, the function returns a negative value with error information and sets dataPackets to NULL and nPackets to 0.
/// HIRET 0 if successful, and negative error code otherwise.
/// OUT dataPackets, nPackets
int GetAllDataPackets (SinkVChan_type* sinkVChan, DataPacket_type*** dataPackets, size_t* nPackets, char** errorMsg)
{
INIT_ERR
CmtTSQHandle sinkVChanTSQHndl = sinkVChan->tsqHndl;
// init
*dataPackets = NULL;
*nPackets = 0;
// get number of available packets
CmtErrChk( CmtGetTSQAttribute(sinkVChanTSQHndl, ATTR_TSQ_ITEMS_IN_QUEUE, nPackets) );
if (!*nPackets) return 0; // no data packets, return with success
// get data packets
nullChk( *dataPackets = malloc (*nPackets * sizeof(DataPacket_type*)) );
CmtErrChk( CmtReadTSQData(sinkVChanTSQHndl, *dataPackets, *nPackets, 0, 0) );
return 0;
CmtError:
Cmt_ERR
Error:
// cleanup
OKfree(*dataPackets);
*nPackets = 0;
RETURN_ERR
}
/* Perform the Read data and Plot data actions */
void CVICALLBACK readDataAndPlot(CmtTSQHandle queueHandle, unsigned int event,
int value, void *callbackData){
unsigned char data[READ_LENGTH];
int tsqRValue = value, tsqREvent = event; //Thread Safe Result Value.
switch(tsqREvent){
case EVENT_TSQ_ITEMS_IN_QUEUE:
/* Read data from the thread safe queue and plot on the graph */
while(tsqRValue >= READ_LENGTH){
CmtReadTSQData(tsqHdl, data, READ_LENGTH, TSQ_INFINITE_TIMEOUT, 0);
/* Start to calculate the 陀螺仪的x,y,z 以及加计的x,y,z */
resultCounter = 0; //用来重新自增计数 resultData[x][resultCounter]中的采集次数
if(dataSrc <=1)
getFinalRightData(&data[0]);
else
simulateData();
/* Plot the data. */
if(tabFlag==0){ //Child Panels Mode
for(int i=0; i<validMonNum; i++){
if(1 == signalShowingStat[i])
PlotStripChart(CPanels[i], PGraphs[i], resultData[i], READ_LENGTH/24, 0, 0, VAL_DOUBLE);
}
}else{ //Tab pages mode
int i = 0;
GetActiveTabPage(panelHdl, tabCtrl, &i);
if(1 == signalShowingStat[i])
PlotStripChart(TPanels[i], PGraphs[i], resultData[i], READ_LENGTH/24, 0, 0, VAL_DOUBLE);
}
tsqRValue -= READ_LENGTH;
}//while(tsqR...)
break;
}//Switch()
}
/// HIFN Attempts to get one data packet from a Sink VChan before the timeout period.
/// HIFN On success, it return 0, otherwise a negative numbers. If an error is encountered, the function returns error information.
/// OUT dataPackets, nPackets
int GetDataPacket (SinkVChan_type* sinkVChan, DataPacket_type** dataPacketPtr, char** errorMsg)
{
#define GetDataPacket_Err_Timeout -1
INIT_ERR
CmtTSQHandle sinkVChanTSQHndl = sinkVChan->tsqHndl;
int itemsRead = 0;
char* msgBuff = NULL;
*dataPacketPtr = NULL;
// get data packet
CmtErrChk( itemsRead = CmtReadTSQData(sinkVChanTSQHndl, dataPacketPtr, 1, (int)sinkVChan->readTimeout, 0) );
// check if timeout occured
if (!itemsRead) {
nullChk( msgBuff = StrDup("Waiting for ") );
nullChk( AppendString(&msgBuff, sinkVChan->baseClass.name, -1) );
nullChk( AppendString(&msgBuff, " Sink VChan data timed out.", -1) );
SET_ERR(GetDataPacket_Err_Timeout, msgBuff);
}
return 0;
CmtError:
Cmt_ERR
Error:
// cleanup
OKfree(msgBuff);
RETURN_ERR
}
