Strange signal on SPI bus

1. offizieller Beitrag

    It seems no one else having a similar problem in the forum, but maybe someone can help nevertheless.

    Everything works so far but there is some kind of repeating external signal superimpose (i hope this is the correct english word)

    the communication which causes flickerig and i dont know its source.

    It also occurs when no effect is running but it disappears when selecting a none SPI-type led in settings.

    I checked the signal with my oscilloscope @ 1ms, 50us, 10us, 1us


    Where could this signal come from?


    Best regards

    Marxon

    Thanks for your response.


    Zitat von Lighting-guy77

    maybe bad PSU or bad grounding.

    No I don´t think so.

    Because like i said, the signal disappears when selecting a none SPI-type led in settings.

    Zitat von Lightning-guy77

    3 line ledstrips are sometimes difficult to run on SPI because of the lack of CLK signal. Then you have to play with baudrate settings and such.

    Yes this is true, but the problem is that unknown signal

    Zitat von TPmodding

    does the signal has 2,72V?

    No it doesn´t.

    2,72V was my trigger voltage.

    The signal has 3,24V.



    Does anybody know how to check in Linux if any other programm in the background is running which uses the SPI port?

    Although it would be interesting to know where the signal come from, I switched from SPI to PWM

    and so far everything seems to work. :)

    Maybe I should ask in a other forum for help to investigate my SPI problem further.

    Thanks a lot.


    Marxon

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