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    Sorry for my late reply, there were a lot of...

    Sorry for my late reply, there were a lot of other things to do.
    Unfortunately, your suggestion hasn't brought a change.
    But there is a new situation in that sometimes totally wrong data is...
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    CR/LF characters are definitely sent by device,...

    CR/LF characters are definitely sent by device, I've checked settings for line ending in serial monitor.

    As an additional prove CR/LF are tested in my code and string with corresponding text...
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    CR and LF/NL characters are dropped

    Hi KurtE,

    any idea why CR and LF/NL characters are dropped? (see previous post)

    Best Regards,
    HuHu
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    ... next step --->

    Hi KurtE,

    removed DMAMEM from definition of "rx_buffer" --> seems to be nearly perfect



    setup(): dest=0x20000DBC
    0123456789012345678901234567890123456789012345678901234567890123...
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    it's getting better

    It's getting better ;)

    First I did a quick test changing "DMAMUX_SOURCE_LPUART4_RX" to "DMAMUX_SOURCE_LPUART4_TX" --> isr is entered now

    After that I replaced the "imxrt.h2 file --> same...
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    Hi KurtE, THX for your quick response! ...

    Hi KurtE,

    THX for your quick response!

    Changing LPUART1 to LPUART4 shows a little change:

    LPUART4_BAUD=0x18200064
    LPUART4_CTRL=0x3C0000

    FYI - Serial2 RX is connected to TX of a...
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    ..... did some reading but no success! Seems...

    ..... did some reading but no success!

    Seems that "dmaRXisr" isn't entered :mad:

    Serial Monitor output:

    LPUART1_CTRL=0x0
    LPUART1_BAUD=0xF000004
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    Thx KurtE! It doesn't matter that you are...

    Thx KurtE! It doesn't matter that you are not Paul ;)

    I'll give it a try - lots of reading to do - hope i can report my results shortly.
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    @ PaulStoffregen

    Hi Paul,

    I hope you can help or give some hints.

    Best Regards,

    HuHu
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    Teensy 4.0 UART RX to DMA

    Teensy 4.0 UART RX to DMA

    Can anyone help to convert the T3.6 example below to T4.0?

    Best Regards,
    HuHu

    ...
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