Hi Yosef Sarusi
LPUART is supported in MQX 5.1. But it is under commercial license. Please check the following link for more details.
https://www.nxp.com/docs/en/release-note/MQXRN.pdf
MQX™ v5 Software Solutions|NXP
If you want to use MQX 4.2 with lpuart, I would suggest you make it by yourself. It is possible to merger a bare metal driver into MQX, however you need to take care about the hardware initialization, some hardware is already initialized in BSP code therefore cannot copy-paste your bare mental code.
You also can refer to lpuart driver in KSDK package, and port it to MQX 4.2.
Regards
Daniel
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