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trides
Joined: 13 Dec 2008
Posts: 19
Location: Indonesia
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 Posted: Thu Jun 25, 2009 5:18 am Post subject: sampling more than 50000 per second |
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Dear sir,
With the help from the available examples, I try to input analog data as in this code below :
| Code: |
#include "HdwLib.h"
#include "UtilLib.h"
#include "DspLib.h"
#include "..\HdwLib\UserData.h"
#include "..\HdwLib\DigitalIo.h"
#include <ctype>
#include <cstdlib>
using namespace II;
IntBuffer varku;
class LoopThread : public Thread
{
public:
LoopThread(AdcStream & ain, UserData & digio, IIPriority priority)
: Ain(ain), Thread(priority), Looping(false), FCount(0), DigIO(digio) { }
// Methods
void Start()
{ Looping = true; Starting.Release(); }
void Stop()
{ Looping = false; Stopping.Acquire(); }
// Properties
int Count() const
{ return FCount; }
protected:
// Data
AdcStream & Ain;
UserData & DigIO;
Semaphore Starting;
Semaphore Stopping;
bool Looping;
// Fields
int FCount;
// Methods
void Execute()
{
while (!Terminated())
{
FCount = 0;
Starting.Acquire();
// echo input to output
while(Looping)
{
Ain.Get();
varku = Ain.Buffer();
++FCount;
DigIO.Data(varku[2]);
}
Stopping.Release();
//
}
}
};
//---------------------------------------------------------------------------
// IIMain() -- Loop analog input to output
//---------------------------------------------------------------------------
void IIMain()
{
AdcStream Ain;
UserData DigIO;
DigIO.Config(15);
LoopThread Loop(Ain, DigIO, tpNormal);
Loop.Resume();
volatile bool status;
float SampleRate;
SampleRate = 50000;
BasicTmb Timebase;
Timebase.Rate(SampleRate);
Ain.Device().Attach(Timebase);
int EventsPerBuffer = 1;
int NumChannels = 10;
for (int i = 0; i < NumChannels; ++i)
Ain.Device().Channels().Enabled(i, true);
Ain.Events(EventsPerBuffer);
status = Ain.Open();
// echo input to output
Loop.Start();
while(!cio.KbdHit())
{
Sleep(50);
}
Loop.Stop();
// Terminate streaming
status = Ain.Close();
}
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I have sucsessfully done the acquisition with sample rate 50000. But when I change with more than 50000, it does not work. Can you tell me where the problem is ?
Second question, is there any example using the AdcFramedTmb ? I tried to change the timebase to this one for the code above, but it does not work either.
Thank you very much
--trides--[/quote] |
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jhenderson
Site Admin
Joined: 07 Mar 2006
Posts: 1177
Location: So. Cal. USA
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| Posted: Thu Jun 25, 2009 6:02 am Post subject: |
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What is the failure mode when you exceed 50 kHz sampling rate? Try running the stock AnalogIn example .out file. Does it fail in a similar manner or does it work properly?
The Framed timebase will be of limited use on a Delfin, since the pipeline of the sigma-delta converters on the card will create a substantial amount of latency (see other Forum threads). |
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