Problemas con chart

[Javo20200]

hola, buen día¿ porque cuando le pongo un chart a mi señal tengo perdida de datos al almacenar información, pero si quito el chart los datos se almacenan correctamente.

[GerdW]

Hi Javo,

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@Javo20200 wrote:

Hello, good day, because when I put a chart on my signal I have data loss when storing information, but if I remove the chart the data is stored correctly.

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Simple solution: don't use a chart!

When you want more detailed/not the simplest suggestions: please attach your VI!

Downconvert (File->Save for previous) to an older LV version when you use one of the recent versions. I prefer LV2019.

[Javo20200]

I attach the program

[GerdW]

Hi Javo,

could you please downconvert to LV2019 and attach again? (File->Save for previous)

[Javo20200]

I'm not an expert, I'm a student, but I need to finish my project so I can get a degree, sorry for my English, I'm using a translator, I speak Spanish. I attach the 2019 version.

[Javo20200]

I am designing a program for an EEG, 4 channels of 250 data per second each. I use the "mpusbapi" library from microchip. Without graphing I have no loss of data, if I put the chart my data presents losses, it is my only problem.

[GerdW]

Hi Javo,

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@Javo20200 wrote:

Without graphing I have no loss of data, if I put the chart my data presents losses, it is my only problem.

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So the chart update takes too much time and you need to reduce that impact…

General recommendations:

• Replace all local variables by wires, especially all those "bandera" and "write handle" variables! There are race conditions hiding behind local variables…
• Cleanup the code to make it more readable! Left-to-right wiring, subVIs instead of duplicated code, and so on!
• Replace ExpressVIs by plain functions to reduce the impact of their (computational) overhead!
• You already use a poducer-consumer scheme to separate DAQ from other task: use one more producer-consumer to also separate the data display from your analysis loop!
• Don't update the chart too often (I don't see any loop iteration speed indication). Charts only needs to be updated <= 10 times per second…
• You use a notifier to send data from TDMS loop to analysis loop: there is an EXPECTED loss of data! Why do you use a notifier?