No UART interrupt with 460800 baud rate

[amel_aitahcene]

Hi all,

I am trying to establish a UART communication between a S32K146 and another device with a 460800 baud rate. When the other device sends a frame, the S32K is supposed to send a response. But with this baud rate, the Rx message never trigs the S32K interrupt.

When I do the same operations with lower baud rates (115200 and 230400), everything goes fine:
- In debug mode, the programs stops well at a breakpoint put in Rx callback
- The S32K responds (seen on the other device console and on Tx signal on a scope)

My first thought was that the actual baud rate was too far from the expected one. I checked on S32DS settings, and it is equal to 461538.

I am also using an oscilloscope to check what is happening on Rx and Tx: I can observe the other device frames on the S32K Rx and I measure a baud rate approximately equal to 462.962.

The baud rate deviation is lower than 1% so it shouldn't be an issue.

Is there a specific setting to configure for high baud rates?

Best regards,

Amel

[Robin_Shen]

Hi Amel,

I test the lpuart_echo_s32k146 example of S32K SDK RTM4.0.3+S32DS v3.4. After change the BaudRate to 460800 in S32 Configuration Tool, I am able to get the UART RX interrupt when send data from PC.

Since the clock configuration is different from yours, the actual BaudRate is a little different. It is recommended that you refer to this example.

Best Regards,
Robin
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