topic S32K144 UART error when initial in boot&app in S32K

S32K144 UART error when initial in boot&app

jingfang — Thu, 29 Sep 2022 15:16:27 GMT

The user only has the app at the beginning, so he initializes clock, UART, can and so on in the APP.Now boot is added, and clock, CAN, UART, etc., are initialized.

The UART prompts garbled characters.

Delete the initialization in the app, then normal.

Is that a good way to solve it? It doesn't feel complete.

Re: S32K144 UART error when initial in boot&app

danielmartynek — Mon, 03 Oct 2022 10:58:51 GMT

Hello @jingfang,

The MCU can be reset before the MCU goes to the application.

I mean the startup code can decide whether it goes to the bootloader or to the application.

Do you use SDK/RTD or your own implementation?

If you use the drivers, you can deinit the module before the jump.

BR, Daniel

Re: S32K144 UART error when initial in boot&app

jingfang — Mon, 03 Oct 2022 13:54:48 GMT

Thanks a lot~

I refer to demo code, it has a reset clock&common&timeout before the jump.

Is there anything else that needs reset, such as RAM?

Re: S32K144 UART error when initial in boot&app

danielmartynek — Tue, 04 Oct 2022 14:45:26 GMT

Hard to say, I don't know what and how it was initialized in the bootloader and how it will be initialized in the application.

However, SRAM initialization is typically done in the startup code of the application, there should be no problem.

BR, Daniel