//************************************
// Method: setupCLK
// FullName: fetch::device::NationalInstrumentsDAQ::setupCLK
// Access: public
// Returns: void
// Qualifier:
//
// set up counter for sample clock
// - A finite pulse sequence is generated by a pair of on-board counters.
// In testing, it appears that after the device is reset, initializing
// the counter task doesn't work quite right. First, I have to start the
// task with the paired counter once. Then, I can set things up normally.
// After initializing with the paired counter once, things work fine until
// the device (or computer) is reset. My guess is this is a fault of the
// board or driver software.
// - below, we just cycle the counters when config gets called. This ensures
// everything configures correctly the first time, even after a device
// reset or cold start.
//************************************
void NationalInstrumentsDAQ::setupCLK(float64 nrecords, float64 record_frequency_Hz)
{
TaskHandle clk = 0;
int32 N = _config->ao_samples_per_waveform();
float64 hz = computeSampleFrequency(nrecords, record_frequency_Hz);
const char *dev =_config->name().c_str(),
*ctr =_config->ctr().c_str(),
*armstart_in =_config->armstart().c_str(),
*gate_out =_config->frame_trigger_out().c_str(),
*trig =_config->trigger().c_str();
float64 lvl =_config->level_volts();
char term_ctr[1024]={0},
term_gate[1024]={0},
term_arm_out[1024]={0};
make_terminal_name(term_ctr ,sizeof(term_ctr) ,dev,ctr);
make_terminal_name(term_gate ,sizeof(term_gate) ,dev,ctr);
strcat(term_gate,"Gate");
make_terminal_name(term_arm_out,sizeof(term_arm_out),dev,gate_out);
DAQERR( DAQmxClearTask(_clk.daqtask) ); // Once a DAQ task is started, it needs to be cleared before restarting
DAQERR( DAQmxCreateTask("fetch_CLK",&_clk.daqtask));
clk = _clk.daqtask;
DAQERR(DAQmxCreateCOPulseChanFreq (clk,term_ctr,NULL,DAQmx_Val_Hz,DAQmx_Val_Low,0.0,hz,0.5));
DAQERR(DAQmxCfgImplicitTiming (clk,DAQmx_Val_FiniteSamps,N));
DAQERR(DAQmxCfgDigEdgeStartTrig (clk,"AnalogComparisonEvent",DAQmx_Val_Rising));
DAQERR(DAQmxSetArmStartTrigType (clk,DAQmx_Val_DigEdge)); // Arm trigger has to be through clk
DAQERR(DAQmxSetDigEdgeArmStartTrigSrc (clk,armstart_in));
DAQERR(DAQmxSetDigEdgeArmStartTrigEdge(clk,DAQmx_Val_Rising));
DAQERR(DAQmxSetStartTrigRetriggerable (clk,1));
DAQERR(DAQmxConnectTerms(term_gate,term_arm_out,DAQmx_Val_DoNotInvertPolarity));
}
/******************************************************************************
**
** Fonction de démarage du comptage de la voie A du compteur incrémentale.
**
******************************************************************************/
bool NI6211::startCounter()
{
int32 error=0;
taskCounter = new TaskHandle;
/*------ DAQmx Configure Code Reading Task ------*/
DAQmxErrChk (DAQmxCreateTask("",taskCounter));
DAQmxErrChk (DAQmxCreateCIAngEncoderChan(*taskCounter,"Equilibreuse/ctr0","",DAQmx_Val_X1,TRUE,999,DAQmx_Val_AHighBLow,DAQmx_Val_Ticks,1000,0,NULL));
DAQmxErrChk (DAQmxSetArmStartTrigType(*taskCounter,DAQmx_Val_DigEdge));
DAQmxErrChk (DAQmxSetDigEdgeArmStartTrigSrc(*taskCounter,"/Equilibreuse/PFI2"));
/*------ DAQmx Start Code ------*/
DAQmxErrChk (DAQmxStartTask(*taskCounter));
Erreur:
checkError(error);
return 0;
}
