topic Re: S32k344 Baud Rate Issue in S32K

S32k344 Baud Rate Issue

Vamsi421 — Wed, 17 Jul 2024 13:01:30 GMT

Hi,

I am using Nxp S32k344 board in my project . In this sending data through UART using 115200 Baud rate is working fine but in receiving the data is corrupted in the buffer. I am trying to receive "12345678" but i am receiving some garbage characters as provided in the below attachments.

Note: I am using LPUART instance 8 with clock frequency 80MHZ

Re: S32k344 Baud Rate Issue

Robin_Shen — Fri, 19 Jul 2024 02:57:35 GMT

Please tell me the S32K3 RTD version, development board model, AUTOSAR MCAL or non-AUTOSAR. Otherwise, I can only suggest you refer to the LPUART routine in S32K3 RTD.
If you use DMA, it is recommended to refer to The S32K344 Lpuart transfer cannot receive data correctly when DMA enable

Best Regards,
Robin
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Re: S32k344 Baud Rate Issue

Vamsi421 — Mon, 22 Jul 2024 11:59:22 GMT

Hi,
Autosar Version : 4.7.0
* Autosar Revision : ASR_REL_4_7_REV_0000
* Autosar Conf.Variant :
* SW Version : 3.0.0
* Build Version : S32K3_RTD_3_0_0_D2303_ASR_REL_4_7_REV_0000_20230331
* Development board model:S32K344HMS

Re: S32k344 Baud Rate Issue

Robin_Shen — Tue, 23 Jul 2024 02:00:27 GMT

Sorry, I don't know which development board you mean by S32K344HMS. Please send me the link. If it is convenient, please upload a simple test project. Otherwise, it is difficult to find the cause quickly with so little information.

Re: S32k344 Baud Rate Issue

Vamsi421 — Tue, 23 Jul 2024 12:55:31 GMT

https://www.nxp.com/design/design-center/development-boards-and-designs/automotive-development-platforms/s32k-mcu-platforms/s32k3x4evb-t172-evaluation-board-for-automotive-general-purpose:S32K3X4EVB-T172

Re: S32k344 Baud Rate Issue

Robin_Shen — Wed, 24 Jul 2024 08:30:57 GMT

Did you use TTL-USB serial module to connect UART signals of S32K3 to PC? Have you used an oscilloscope or logic analyzer to measure the serial port signals sent from the PC and the signals sent from the S32K3, such as baud rate and size of the data frame\parity\Stop bits?

The information you provided is too little, so I can't help you find the cause of the problem quickly. Would you mind sending me the test project?

Re: S32k344 Baud Rate Issue

Vamsi421 — Wed, 24 Jul 2024 11:27:32 GMT

send me the test project with 115200 baudrate

Re: S32k344 Baud Rate Issue

Robin_Shen — Thu, 25 Jul 2024 05:06:09 GMT

Please test the example K344_UART_DMA_Working.zip (S32K3_RTD_3_0_0_D2303) that I gave you in the web link to ensure that your TTL-USB serial module and PC host computer are working properly.
PTA29(lpuart2_tx) and PTA30(lpuart2_rx)
9600 baudrate
If it can be received correctly, then only a slight modification is needed.