topic Re: s32k312 uart in S32K

s32k312 uart

fengba_360 — Fri, 18 Jul 2025 03:20:26 GMT

Hello, when using UART communication on the S32K312, if the baud rate exceeds 19200, the received data has a high error rate or even fails entirely. At baud rates below 19200, there are no issues. What could be causing this, and how can I optimize it? Below are my receive code and clock configuration？

Re: s32k312 uart

PetrS — Fri, 18 Jul 2025 09:18:12 GMT

Hi,

most probably it will be due to callback processing. Remove below code and rely just on callback events.

Try to keep RXFULL event as short as possible as this is called for each byte received if Receive function was called with 1 byte to be received.

BR, Petr

Re: s32k312 uart

fengba_360 — Tue, 22 Jul 2025 05:01:40 GMT

"This is not the issue. If I increase the baud rate, the serial bus seems to crash, and the MCU stops receiving data. If I enable error recovery, there are instant data errors but it doesn't stop receiving. Have you encountered this problem before?"

Re: s32k312 uart

PetrS — Tue, 22 Jul 2025 10:58:44 GMT

Hi,

the code is redundant, but can be useful to restore reception.

You should rather use Events directly, like below

The received byte processing code should be as short as possible, to have short execution time. This callback event must be called for each byte received. Otherwise you will get overruns etc.

So consider interrupt priority with respect of other tasks/peripherals of your application.

BR, Petr