UART Transmitting Garbage Data When Using FreeRTOS S32k118

Arunpk — Fri, 30 May 2025 06:26:11 GMT

I attempted to send and receive data via UART using FreeRTOS. However, the transmitted data appears as random or corrupted characters, for example:
tK�Z)J�Z)J�{hK�ZtJ�ZtK�KhK�)J�Z)J�)J�)J�)J�KtK�KtK�)J�ZtJ�{hK�KtK�KtK�ZtK

My actual intended message is:
"Welcome to RTOS \r\n"

When I run the same UART communication code without FreeRTOS, it works correctly and the message is transmitted as expected.

Please assist as soon as possible to help resolve this issue.

Thank you.

Re: UART Transmitting Garbage Data When Using FreeRTOS S32k118

PavelL — Fri, 30 May 2025 07:32:38 GMT

Hello @Arunpk ,

You have shared your code on our system already. So, please kindly review my observations:

1. You are currently using an outdated SDK. It is recommended to migrate to the RTD (Real-Time Drivers) for better support and long-term maintainability.
2. Clock initialization is being performed inside a task. This should be done before the scheduler starts, ideally during system initialization.
3. If you are using FreeRTOS, it is preferable to use vTaskDelay(MS_TO_TICKS(1000)) instead of delay_ms(1000) to ensure proper task scheduling and timing accuracy.

Best regards,

Pavel

topic UART Transmitting Garbage Data When Using FreeRTOS S32k118 in S32K

UART Transmitting Garbage Data When Using FreeRTOS S32k118

Re: UART Transmitting Garbage Data When Using FreeRTOS S32k118