Hi, Please help me .
I'm Using NI PCI6259 and VC + + 2008.
• to solve problems
-> Multiple analog output channels using different frequencies,
Each different and each channel frequency can be adjusted would like to export the output to an analog waveform.
(Ex: AO0 = 503Hz, AO1 = 15Hz / AO0 = 497Hz, AO1 = 15Hz)
• Issues and Questions
-> PCI-6259 in the 'DAQmxCreateAOFuncGenChan' do you disable the function, correct?
If so, 'DAQmxCreateAOVoltageChan' to be controlled through the output waveform,
Sampling Rate is common to the two channels.
Channel're going to be controlled by manipulating the buffer data is not only that correct?
For example,
Using 75KHz external Sample clock
AO0 => 500Hz, AO1 => 15Hz output to be generated
F (analog) = F (update) / (samples / cycle) by the formula in
The number of 150 samples per channel AO0, AO1 5000 the number of samples per set
If the total number of buffers is set to 15000, 500Hz and 15Hz can be generated in the output.
In order to control the frequency of data samples per channel is set to 148 and 5000, the
The total number of sample data set, how do I do?
148 * 5000 => 74000 buffer, this correct?
Attach a sample source.
Please comment if any.
//////////////////////////// sample code///////////////////////////////
/ / The following code is an external clock source (PFI13) receives the analog output 15Hz, 500Hz, 15Hz to generate output code.
/ / 15Hz, 501Hz, 15Hz or 15Hz, 499Hz, 15Hz output for information on how to export?
int32 error=0;
char errBuff[2048]={'\0'};
int i=0;
int32 written;
int nSamples = 15000;
int dSamplesPerSecond = 5000;//sample per ch0
int dSamplesPerSecond2 = 150;//sample per ch1
int dSamplesPerSecon3 = 5000;//sample per ch2
//generating waveform data
//Ch1
double *data1 = new double[];
data1 = m_Cls_FunGen.FunctionGenerator(1, dSamplesPerSecond, 5); //waveform, numCycles, numSamplesPerCycle, amplitude
//Ch2
double *data2 = new double[];
data2 = m_Cls_FunGen.FunctionGenerator(3, 100, dSamplesPerSecond2, 5); //waveform, numCycles, numSamplesPerCycle, amplitude
//Ch3
double *data3 = new double[];
data3 = m_Cls_FunGen.FunctionGenerator(3, 3, dSamplesPerSecon3, 5); //waveform, numCycles, numSamplesPerCycle, amplitude
double *data = new double[nSamples * 3];
for(int i = 0; i < nSamples; ++i)
data[i] = data1[i];
for(int i = nSamples; i < nSamples*2; ++i)
data[i] = data2[i - nSamples];
for(int i = nSamples*2; i < nSamples*3; ++i)
data[i] = data3[i - nSamples*2];
/*********************************************/
// DAQmx Create Code
/*********************************************/
DAQmxErrChk (DAQmxCreateTask("", &AOAlltaskHandle));
DAQmxErrChk (DAQmxCreateAOVoltageChan(AOAlltaskHandle, "Dev1/ao1:3", "", (float)(-10), (float)(10), DAQmx_Val_Volts, NULL));
/*********************************************/
// DAQmx Configure Code
/*********************************************/
DAQmxErrChk (DAQmxCfgSampClkTiming(AOAlltaskHandle, "/Dev1/PFI13", 1000.0, DAQmx_Val_Rising, DAQmx_Val_ContSamps, nSamples));
//Set Trig
DAQmxErrChk (DAQmxCfgDigEdgeStartTrig(AOAlltaskHandle, "/Dev1/PFI13", DAQmx_Val_Rising));
/*********************************************/
// DAQmx Write Code - numSampsPerChan, autoStart, timeout, dataLayout, writeArray
/*********************************************/
DAQmxErrChk (DAQmxWriteAnalogF64(AOAlltaskHandle, nSamples, 0, 10.0 ,DAQmx_Val_GroupByChannel,data, &written,NULL));
/*********************************************/
// DAQmx Start Code
/*********************************************/
DAQmxErrChk (DAQmxStartTask(AOAlltaskHandle));
