HuHu
Junior Member

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 displayed. Sometimes it...

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 should be printed.

Hi KurtE, any idea why CR and LF/NL characters are dropped? (see previous post) Best Regards, HuHu

Hi KurtE, removed DMAMEM from definition of "rx_buffer" --> seems to be nearly perfect setup(): dest=0x20000DBC 0123456789012345678901234567890123456789012345678901234567890123...

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 result, isr is entered ...

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 GPS-module at 9.600 Baud

..... did some reading but no success! Seems that "dmaRXisr" isn't entered :mad: Serial Monitor output: LPUART1_CTRL=0x0 LPUART1_BAUD=0xF000004

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.

Hi Paul, I hope you can help or give some hints. Best Regards, HuHu