Hi Matheus,
If you want to use the UART0 you need to use the fsl_lpsci component:


This is because the UART modules are supported by different HAL/drivers, the UART0 module is supported by the LPSCI HAL/driver and the UART1 and UART2 modules are supported by UART HAL/driver.
Hope it helps!
Best Regards,
Carlos Mendoza
Technical Support Engineer
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