B4J Question Receiving Data in Background

MList said:

Sub AStream_NewData

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Sub AStream_NewData (Buffer() As Byte)
    Dim data As String = BytesToString(Buffer, 0, Buffer.Length, "UTF8")
    Log(data)
End Sub

MList said:

Hi All,
I have an B4X Project, which is receiving Data via Serial Lib and AsyncStreams.
The data are measuring value which come continiusly (200kHz) approx. 15 values every second.
The incoming data is very difficult to handle and i have problems with handling the gui.
How can I manage to put this Sub AStream_NewData or the whole serial communitcation to Background.
Sorry never worked with background tasks ... just have no idea.

Should later on also work in B4i and B4a...
Thanks a lot for your help

Marion List

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aeric said:

I suppose it is consider as background. You can add a Log to see the data without doing anything with the GUI.

B4X:

Sub AStream_NewData (Buffer() As Byte)
    Dim data As String = BytesToString(Buffer, 0, Buffer.Length, "UTF8")
    Log(data)
End Sub

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emexes said:

What does the 200 kHz refer to? Is the serial link running at 230.4 kbps?


Why? What format is it in? Like, is it readable ASCII, perhaps separated into lines, or is it a fixed-length packet containing fixed-length binary data?


Maybe you don't have to update the gui for each incoming packet - eg, if your gui is a meter or numeric display of the incoming value, and you receive a burst of several values, then perhaps it is enough to just update the meter/display to the most-recent value, and ignore/discard the skipped values (unless you're also keeping track of peak value or average value etc)

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Erel said:

There is no such thing. The problem is somewhere else.

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MList said:

I really dont know the exact speed, but it seems very fast. There is no problem with reading or displaying the incoming data. It is just that the incomimg data
ist interrupting my routines the user called (by pressing a button) and it seems to me after receiving data he doesnt return to the correct point where he was interruptet.

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teddybear said:

The AsyncStreams reading and writing are done with two separate threads. it works in the background.
I think the problem is how you handle the incoming data rather than manage it to background.

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MList said:

Yes but when debugging. For example when my programm is in a loop doine something, and then data is coming then it goes to asyncstreamsnewdata and comes back and begins the routine where my loop was at the beginning... That was what i saw.. in my opinion he had to finish the loop where he left it. But i am trying to prove it with an exmple . thanks a lot

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MList said:

Yes but when debugging. For example when my programm is in a loop doine something, and then data is coming then it goes to asyncstreamsnewdata and comes back and begins the routine where my loop was at the beginning... That was what i saw.. in my opinion he had to finish the loop where he left it. But i am trying to prove it with an exmple . thanks a lot

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Erel said:

If there is no call to Sleep / Wait For inside the loop then it will not leave the loop until it ends.
If there is such a call then the event can be raised, however it will later resume from the correct point.

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Erel said:

If there is no call to Sleep / Wait For inside the loop then it will not leave the loop until it ends.
If there is such a call then the event can be raised, however it will later resume from the correct point.

Click to expand...