How to clear the output buffer, possibly resize and burn again, before you begin the task of output

I use PyDAQmx with a USB-6363, but I think the question is generic to DAQmx.

I have an output buffer that I want to be able to (re) write to without starting the task output.

More specifically, I have a graphical interface and a few sliders, the user can move.  Whenever the slider changes, a new set of values is loaded into the buffer output through DAQmxWriteAnalogF64.  After you set the value, the user can click on a button and start the task output.

In some cases the change in cursor does not require a change in buffer size, only a change in the data.  In this case, I get the compalint following DAQmx as they tried writing:

The generation is not yet started, and not enough space is available in the buffer.

Set a larger buffer, or start the generation before writing data more than content in the buffer.
Property: DAQmx_Write_RelativeTo
Value: DAQmx_Val_CurrWritePos
Property: DAQmx_Write_Offset
Corresponding value: 0
Property: DAQmx_Buf_Output_BufSize
Corresponding value: 92

In other cases the change in cursor requires both change in the size of the buffer and data modification.  In this case, I get the following, but only after that do a few times each time increase the size of the writing.

DAQmx writing failed because a previous writing DAQmx configured automatically the size of output buffer. The size of the buffer is equal the number of samples written by channel, so no additional data can be written before the original task.

Start the generation of before the second writing DAQmx or set true in all instances of writing DAQmx Auto Start. To gradually write to the buffer before starting the task, call DAQmx Configure an output buffer before the first writing DAQmx.
Task name: _unnamedTask<0>

State code:-200547
function DAQmxWriteAnalogF64

I tried to configure the output via DAQmxCfgOutputBuffer buffer (in some cases, by setting it to zero or a samples, then save again, in an attempt to clear it) but that doesn't seem to do the trick.

Of course, I can work around the problem by loading data only when the user clicks the end button, but not what I'm asking here.

Is it possible to "remake" the writing of output before you begin the task?

Thank you

Michael

Today I have no material practical to validate, but try unreserving task before writing the new buffer:

DAQmxTaskControl (taskHandle, DAQmx_Val_Task_Unreserve);

With a simulated device, he made the error go away in case the buffer is the same size.  You will need to validate if the data are in fact correct, but I think it should be (unreserving I would say reset the write pointer so the old buffer are replaced with the new data).

I always get errors when you try to change the size of buffer if (on my 6351 simulated).  I posted some similar mistakes about the reconfiguration of the tasks here, I guess it is possible that this issue has also been set at 9.8 (I always use 9.7.5 on this computer).  If the behavior is still present in the new driver, and also appears on real hardware (not just simulated), then it seems that this is a bug of DAQmx someone at OR should be considered.

I wrote a simple LabVIEW VI that captures the error in order to help people to NOT reproduce it:

The best solution at the moment would be likely to re-create the task if you need to change the size of the buffer (or avoid writing data until you are sure what will be the size of buffer).

Best regards

Tags: NI Hardware

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