S32KのトピックRe: uart_pal_s32k144w status = STATUS_UART_RX_OVERRUN

uart_pal_s32k144w status = STATUS_UART_RX_OVERRUN

juliencs — Wed, 09 Mar 2022 18:03:13 GMT

Hello,

I am trying to run the uart_pal_s32k144w example on the s32k144w evaluation board but when I run the code, it only prints the first letter of the welcome message. I tried to fix this by replacing the function UART_SendDataBlocking with UART_SendData and now the welcome message prints but the while loop errors out because the status of the UART is STATUS_UART_RX_OVERRUN. I tried to use a while loop to wait for the whole message to print before the code moves on but that didn't work either. What does this status mean and what can I do to fix it?

I am using a serial connection to PuTTY with a baud rate of 9600 to see the printed output.

Any help would be appreciated.

Thanks,

Julie

Re: uart_pal_s32k144w status = STATUS_UART_RX_OVERRUN

danielmartynek — Thu, 10 Mar 2022 13:29:39 GMT

Hello Julie,

I can't reproduce the issue with

S32DS 3.4

SDK RTM v4.0.2

uart_pal_s32k144w

It works as expected:

Which SDK version do you use?

BR, Daniel

Re: uart_pal_s32k144w status = STATUS_UART_RX_OVERRUN

danielmartynek — Thu, 10 Mar 2022 13:39:27 GMT

Anyway, if you use the non-blocking function, you can use the below function to get the status of the ongoing transfer

UART_GetTransmitStatus()

Once the transfer is complete, a new one can be started.

STATUS_UART_RX_OVERRUN should be returned only of the driver fails to read all the RX data (from the PuTTY terminal) in time.

Regadrs,

Daniel

Re: uart_pal_s32k144w status = STATUS_UART_RX_OVERRUN

juliencs — Thu, 10 Mar 2022 15:36:15 GMT

Hello Daniel,

Thank you for replying!

I am using S32DS 3.4 and SDK RTM 4.0.2.

The UART_GetTransmitStatus() helped, now the program has no problems printing.

When I step through debugging the program, it is able to get to the UART_ReceiveData() function and will wait for me to type and hit enter in the putty terminal, but as soon as it checks the receive status, it still says STATUS_UART_RX_OVERRUN and the program sends the error message and breaks the loop. If I simply let the program run it will let my type and hit enter in the putty terminal but does not send the error message.

Why would the driver be failing to read the RX data? Do I need to clear the OR flag?

Thanks,

Julie

Re: uart_pal_s32k144w status = STATUS_UART_RX_OVERRUN

danielmartynek — Fri, 11 Mar 2022 07:55:05 GMT

Hello Julie,

Do you have a logic analyzer or an oscilloscope?

Can you scope the TX RX pins?

Thanks,

Daniel

Re: uart_pal_s32k144w status = STATUS_UART_RX_OVERRUN

juliencs — Fri, 11 Mar 2022 23:21:25 GMT

Hello Daniel,

Thanks for the reply.

I ended up just transferring one byte at a time and moving the SendData function into the rxCallback function, which seems to work.

Best Regards,

Julie