Test and Measurement Forum

Hi,

I'm using the ps3000 API to get some measurements from a 3204. But I have a problem when using the streaming mode and stopping it again. It then just freeze in the ps300_stop function, and ill have to plug the cable for it to continue. PicoScope 6 and Picolog works fine. It seems like I cant interrupt the streaming.

The smallest code i get it with. (C#)

short[] bufferA = new short[60000];
short[] bufferB = new short[60000];

PS3000 ps = new PS3000();
ps.Open();

ps.SetChannel(PS3000.Channel.ChannelA, true, PS3000.Coupling.DC, PS3000.Range.Range5V);
ps.SetEts(PS3000.EtsMode.Off, 0, 0);
ps.SetTrigger(PS3000.Channel.None, 0, PS3000.TriggerThresholdDirection.Rising, 0, 0);

ps.RunStreaming(30, 60000, 0);

Thread.Sleep(10000);

short numOverflows;
int numberOfValuesCaptured = ps.GetValues(bufferA, bufferB, null, null, out numOverflows, 60000);

ps.Stop(); // Freezes in this call

Any ideas what i must do to make it work?

Thanks!

Hi

I'm not sure why that is causing problems.

Have you tried the C console example?

Robin

Hi Roben,

Thanks for taking your time to answer.

I've tried it and it does the same with the streaming mode. So it fail with both PS3000con.c and the C#.

When it fails I have to unplug the USB and remove the power cable from the pico and then put the power cable in again and then put the USB cable in again for it to work.

I've tried the 6.2.3 version, and looked if there was some new DLL in it. It was the same, so no win in that version either.

I've also tried it on a clean Windows XP, installed the drivers with the PicoScope 6.2.2 installation, plugging it in, and running the PS3000con. Then it freezes also when ps3000_stop is called.

Robin Sorry

that's OK

I'm trying to re-create the problem using the console example. When you run it and select 'S', what happens? Does it hang on the first call to ps3000_stop?

Hi.

It retrieves the measurements fine. Only when closing or stopping it fails.

I have tried it on three different computers: Two of them Windows XP (Lenovo Thinkpad T60 and a unknown) and one Windows 7 (Lenovo Thinkpad T60).

In Windows XP it is possible to call the ps3000_stop function after streaming and it returns to the menu. But.. when pushing X to exit and leave the memu loop, it freezes at ps3000_close_unit() instead.

In Windows 7 it already freezes at the ps3000_stop. So it get a little further on XP, but it will not allow the unit to be closed properly in any of them.

If I close the console and start it again, the pico is not correctly shut down and I have to reconnect the power and USB cable.

Can you try this driver and let me know how you get on?

Thanks

Hi Robin,

Its working like a charm in Windows XP machines. Beautiful! Thanks

On Windows 7 it still hangs at the ps3000_stop command. Can I supply any information to help finding the cause?

I'm surprised that the problem still occurs in Windows 7. I will give it a try.

Hi Robin,

Thanks.

The 3.6.4.7 behaves different than 3.6.4.6 in the ps3000_stop command.

The behaevior in 3.6.4.6 was when it was called, it kept using cpu cycles in the setAdvTriggerDelay function for 10 seconds and then the threads shut down. In the 3.6.4.7 version it stops imediately when ps3000_stop is called. But both don't return control to the program and shuts the picoscope properly down.