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Can't get the display values when Arduino is busy?

Hi.. I'm trying to integrate my application to Nextion display.

I can send info to the display perfectly.!!

But when I need to get interactions from LCD it doesn't work fine..

When the loop keeps running, the results from nextion doesn't arrive corectly..

String vresultado;

 while (serial_display.available())


  char vsaida =;



if I do a "return" after that.. it works perfect.

But if I let the loop runs,  its like the serial information from my SoftSerial gets corrupted or something.

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