S32K324 Lpuart_lin Master Continually Returning Status "LPUART_LIN_IP_STATUS_TX_BUSY"

[the_chuck77]

Hi,

I am using the S32K324 in a project, and am running into issues using the Lpuart_lin driver. Executing the function "Lpuart_Lin_Ip_SendFrame" returns "LPUART_LIN_IP_STATUS_SUCCESS", however when polling the LIN instance's status after it returns "LPUART_LIN_IP_STATUS_TX_BUSY". All subsequent calls to "Lpuart_Lin_Ip_SendFrame" return a fail.

I checked the RX and TX lines going into my LIN transcoder, as well as the LIN output and I can see a 650 microsecond low pulse followed by nothing. There is no data sent apart from this break, which is seen on all 3 lines.

Any ideas as to what could be causing the issue? I have attached the file containing the Init and Send functions I have created.

Thanks!

EDIT: Wanted to add, the LIN instance has a "CurrentNodeState" of "LPUART_LIN_IP_NODE_STATE_SEND_BREAK_FIELD".

[PetrS]

Hi,

it looks like driver interrupt is not called to next frame bytes are not processed. Try to check that.
You can also refer to RTD demo examples.

BR, Petr

[jichengyou]

hello @PetrS 

I have encountered the same problem now, when MCU sends as host, LPUART_LIN_IP_STATUS_TX_BUSY, and
the LIN instance has a "CurrentNodeState" of "LPUART_LIN_IP_NODE_STATE_SEND_BREAK_FIELD".

But now the api for rerouting interrupts seems to have been removed, leaving only the IntCtrl_Ip_Init function.

I can't find another solution, please tell me if there is another way to check my error.

[the_chuck77 · Accepted solution]

Hi Petr,

Thanks for the response, I had already added the interrupt handler to IntCtrl_Ip. The issue turned out to be, I was initializing the interrupt and configuring the interrupt routing after initializing the LIN.

Now that I am initializing the interrupt before the LIN I am successfully sending LIN frames.

Thanks!