IMXRT1064 EVK LPUART8 RTS is not working

[Lukas_Frank]

Hi Dear Authorized,

I am using UART8 RTS Signal with (GPIO_SD_B0_03) on EVK. RTS signal is not succesfully observing in oscilloscope. I am able to observe UART8 TX data successfully with (GPIO_AD_B1_10) but RTS is not working. By the way, I am able to see RTS for UART2 (GPIO_AD_B1_01) and UART3 (GPIO_AD_B1_05) with oscilloscope. Is there same problem on your side? I am looking pin schemas with RM, Rev. 2, 07/2021 and SCH-32221 Rev A2 Sheet. 

Could you please inform me ?

Thanks and Regards.

[Lukas_Frank]

Hi Dear @kerryzhou,

I applied your advice. It works now. Thank you.

Best wishes.

[Lukas_Frank]

Hi @kerryzhou ,

I defined and set up related pin configurations in pin mix.c but I didn’t solder with R278. I will try it.

Thanks and Regards.

[kerryzhou]

Hi @Lukas_Frank ,

   When you use the GPIO_SD_B0_03 in the MIMXRT1064-EVK board, you need to solder R278, do you solder it? Then you can use the J24 pin 5.

BTW, in the pinmux.c code, you also need to define the pin to the UART8 RTS.

Do you do it?

As UART8 and the UART2 is the same IP, so if the hardware configuration and the software configuration is correct, it should also works.

Best Regards,

Kerry

[kerryzhou · Accepted solution]

Hi @Lukas_Frank ,

   If you are using J24 pin 5, you must solder R278, otherwise, hardware didn't connect to the MCU, that's why you can't make it work.

  Wish it helps you!

Best Regards,

kerry