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    16 MHz might be enough too, but I need to send...

    16 MHz might be enough too, but I need to send >1.5 MByte/sec.
    I just tried something. Additional to your suggestion, of pulling the dis-/enable out of the single write call, I pulled "port->CTRL |=...
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    You are right, I have to see wether or not it is...

    You are right, I have to see wether or not it is usefull. Like I said I could use it to start other communications while serial is busy.
    It might be a stupid question, but why is UART...
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    That looks good! It sounds like thats about the...

    That looks good!
    It sounds like thats about the idea I had in my head :D

    I will try that myself later.
    But for some real-talk now: does it really change anything? It seems the interrupts...
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    Thanks for your fast response! As you can see...

    Thanks for your fast response!
    As you can see in my code, I already use availabeforwrite(), and it shows the whole buffer is empty prior calling write(), so thats no issue.
    I agree, that arduino...
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    Serial.write not working as expected (for me)

    I got an unusual problem with a seemingly blocking call to write() while using Serial2 with 20MHz

    I have put together a minimum working example to show my problem.
    Futher down are several results...
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