S32K344 RTD3.0.0 UART Baudrate

[iverson3ya]

I've migrated from RTD2.0.3 to RTD3.0.0 and encountered an issue with the UART baudrate settings. For some reason, the baudrate values appear to be incorrect when I transmit data. While everything worked fine in RTD2.0.3 in terms of both sending and receiving data via UART, I'm facing difficulties with RTD3.0.0. I've tested this with both UART0 (80MHz) and UART9 (40MHz) ports, and the problem persists for both.

S32DS3.4 -> RTD2.0.3   UART success

S32DS3.5 -> RTD3.0.0   UART bauderate fail

All the settings are exactly the same.

[Robin_Shen · Accepted solution]

Hi 

Please tell me which RTD are you using for testing?
Please tell me which NXP S32K344 development board are you testing? So that I can test it on that board.
Which example are you testing? Uart_Example_S32K344 or LpuartFlexio_Uart_Ip_Example_S32K344?
Try to send 0x55 and then measure the actual baud rate sent by the UART. And compared with the baud rate that you configured.

Best Regards,
Robin
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[iverson3ya]

Thank you for your help. I have already found the reason.

I forgot to include the following code after Mcu_InitClock.

#if (MCU_NO_PLL == STD_OFF)
/* Wait until PLL is locked */
while (Mcu_GetPllStatus() != MCU_PLL_LOCKED){}
/* Use PLL clock */
Mcu_DistributePllClock();
#endif