topic MIMXRT1020-EVK Arduino connector UART setting in i.MX RT Crossover MCUs

MIMXRT1020-EVK Arduino connector UART setting

CarlLee — Tue, 06 Sep 2022 04:12:44 GMT

I have the MIMXRT1020-EVK board for testing.

There is UART function pins in the Arduino connector. How to set the UART pins function?

I try to modify the sample code from evkmimxrt1020_lpuart_interrupt.

#define DEMO_LPUART LPUART1
#define DEMO_LPUART_IRQn LPUART1_IRQn
#define DEMO_LPUART_IRQHandler LPUART1_IRQHandler

I change the "LPUART1" to "LPUART2" but the uart in the Arduino connector is not function.

Please advise,

Thanks

Carl

Re: MIMXRT1020-EVK Arduino connector UART setting

jeremyzhou — Tue, 06 Sep 2022 06:59:39 GMT

Hi @CarlLee ,
Thank you for your interest in NXP Semiconductor products and for the opportunity to serve you.
Besides the above configuration, it also needs to initialize the UART pins.
Have a great day,
TIC

-------------------------------------------------------------------------------
Note:
- If this post answers your question, please click the "Mark Correct" button. Thank you!

- We are following threads for 7 weeks after the last post, later replies are ignored
Please open a new thread and refer to the closed one, if you have a related question at a later point in time.
----------------------------------------------------------------------------

Re: MIMXRT1020-EVK Arduino connector UART setting

CarlLee — Thu, 08 Sep 2022 02:13:21 GMT

Dear Jeremy Zhou,

Thanks for your answer.

It is solved by further setting the pins as follows.

//set lpUART2 io pins
IOMUXC_SetPinMux(IOMUXC_GPIO_AD_B1_08_LPUART2_TX, 0U);
IOMUXC_SetPinMux(IOMUXC_GPIO_AD_B1_09_LPUART2_RX, 0U);
IOMUXC_SetPinConfig(IOMUXC_GPIO_AD_B1_08_LPUART2_TX, 0x10B0U);
IOMUXC_SetPinConfig(IOMUXC_GPIO_AD_B1_09_LPUART2_RX, 0x10B0U);