How to solve RxFifoOverflow problem ?

[andydong1]

Hi,

As title,

when I transmit data to my device, it only can receive 7 frames,

and then it will show RxFifoOverflow information.

like below picture

How to clear the RxFifo data to avoid RxFifoOverflow?

Or is there any suggestions to solve this problem ?

thanks!

Best Regards,

Andy Dong

[jeremyzhou]

Hi Andy Dong,

Thank you for your interest in NXP Semiconductor products and
for the opportunity to serve you.
Before answering your question, I'd like to know what board and demo code you use, otherwise I've no idea what to do next.

Have a great day,
TIC

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[andydong1]

Hi, jeremyzhou‌

I used imxrt1050 and SDK is 2.7.0 

Example is evkbimxrt1050_flexcan_loopback_transfer.

I had modified the code to use RxFifo to receive data.

Best Regards,

Andy Dong

[jeremyzhou]

Hi Andy Dong,

Thanks for your reply.
Please upload the modified code.

Have a great day,
TIC

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[andydong1]

Hi, jeremyzhou‌

below is the modified code

flexcan_loopback_transfer.c - Google Drive 

Thanks

[jeremyzhou]

Hi Andy Dong,

I've run the code, actually, it doesn't print out the same message as you mentioned before, so please check the uploaded code.

Have a great day,
TIC

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[andydong1]

Hi jeremyzhou‌
I've uploaded my entire project, below is the link
evkbimxrt1050_flexcan_loopback_transfer.7z - Google Drive 
please try again thanks

Best Regards,
Andy Dong

[jeremyzhou]

Hi Andy Dong,

Thanks for your reply.
I run your new code, unfortunately, it still can't print out the same message as you described before.

Have a great day,
TIC

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[andydong1]

Hi. jeremyzhou‌
I think I didn't describe my procedure in detail.

In your picture, it happened because you didn't connect another device through canbus.

so it will become status=5310(kStatus_FLEXCAN_ErrorStatus),

when you use function FLEXCAN_TransferSendNonBlocking(EXAMPLE_CAN, &flexcanHandle, &txXfer);

In real conditions, our device will connect to other devices through canbus.

In my test, when I use another device to send data(more than 7 frames) to my device,

it can only receive 7 frames and then become status 5309->5308->5312.

To simplify for you to test, I have modified the code.

evkbimxrt1050_flexcan_loopback_transfer_upload.7z - Google Drive 

It runs in LoopBack mode and I use for loop to send data(more than 7 frames)

It can only receive 6 frames and then become status 5309->5308->5312. 

It's the same error as I met in real conditions.

Is there any solution to solve this problem?

Best Regards,

Andy Dong

[jeremyzhou · Accepted solution]

Hi Andy Dong,

Sorry for reply late.
After serval rounds of testing and modification, the modified demo works well, and I've attached the modified demo.

==FlexCAN loopback example -- Start.==

status = 5307 = kStatus_FLEXCAN_RxFifoIdle
------ Frame Info ------
Timestamp : 51 
Length    : 8 
Type    : 0 
Format    : 1 
ID        : df80106 
PGN    : 129025 
DataWord0 : 0x80b2e60 
DataWord1 : 0x80221f48 
---------- End ----------
MB 13 - status = 5301 = kStatus_FLEXCAN_TxIdle
MB 13 - status = 5301 = kStatus_FLEXCAN_TxIdle
status = 5307 = kStatus_FLEXCAN_RxFifoIdle
------ Frame Info ------
Timestamp : 6673 
Length    : 8 
Type    : 0 
Format    : 1 
ID        : df80106 
PGN    : 129025 
DataWord0 : 0x80b2e6 
DataWord1 : 0x80221f48 
---------- End ----------
status = 5312 
MB 13 - status = 5301 = kStatus_FLEXCAN_TxIdle
status = 5307 = kStatus_FLEXCAN_RxFifoIdle
------ Frame Info ------
Timestamp : 13669 
Length    : 8 
Type    : 0 
Format    : 1 
ID        : df80106 
PGN    : 129025 
DataWord0 : 0x80b2e 
DataWord1 : 0x80221f48 
---------- End ----------
status = 5312 
MB 13 - status = 5301 = kStatus_FLEXCAN_TxIdle
status = 5307 = kStatus_FLEXCAN_RxFifoIdle
------ Frame Info ------
Timestamp : 20664 
Length    : 8 
Type    : 0 
Format    : 1 
ID        : df80106 
PGN    : 129025 
DataWord0 : 0x80b2 
DataWord1 : 0x80221f48 
---------- End ----------
status = 5312 
MB 13 - status = 5301 = kStatus_FLEXCAN_TxIdle
status = 5307 = kStatus_FLEXCAN_RxFifoIdle
------ Frame Info ------
Timestamp : 27638 
Length    : 8 
Type    : 0 
Format    : 1 
ID        : df80106 
PGN    : 129025 
DataWord0 : 0x80b 
DataWord1 : 0x80221f48 
---------- End ----------
status = 5312 
MB 13 - status = 5301 = kStatus_FLEXCAN_TxIdle
status = 5307 = kStatus_FLEXCAN_RxFifoIdle
------ Frame Info ------
Timestamp : 34593 
Length    : 8 
Type    : 0 
Format    : 1 
ID        : df80106 
PGN    : 129025 
DataWord0 : 0x80 
DataWord1 : 0x80221f48 
---------- End ----------
status = 5312 
MB 13 - status = 5301 = kStatus_FLEXCAN_TxIdle
status = 5307 = kStatus_FLEXCAN_RxFifoIdle
------ Frame Info ------
Timestamp : 41525 
Length    : 8 
Type    : 0 
Format    : 1 
ID        : df80106 
PGN    : 129025 
DataWord0 : 0x8 
DataWord1 : 0x80221f48 
---------- End ----------
status = 5312 
MB 13 - status = 5301 = kStatus_FLEXCAN_TxIdle
status = 5307 = kStatus_FLEXCAN_RxFifoIdle
------ Frame Info ------
Timestamp : 48436 
Length    : 8 
Type    : 0 
Format    : 1 
ID        : df80106 
PGN    : 129025 
DataWord0 : 0x0 
DataWord1 : 0x80221f48 
---------- End ----------
status = 5312 
MB 13 - status = 5301 = kStatus_FLEXCAN_TxIdle
status = 5307 = kStatus_FLEXCAN_RxFifoIdle
------ Frame Info ------
Timestamp : 55347 
Length    : 8 
Type    : 0 
Format    : 1 
ID        : df80106 
PGN    : 129025 
DataWord0 : 0x0 
DataWord1 : 0x80221f48 
---------- End ----------
status = 5312 ‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Have a great day,
TIC

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[jeremyzhou]

Hi Andy Dong,

Sorry for your reply late.
Firstly, I've already replicated your issue. Then, after investigating further, I find the FIFO would overflow after receiving exceeds six frames, and the code will stop at the breakpoint as below figure shows.
It definitely is the cause of the issue, however, I'm still working on the reason of FIFO overflow event.
According to the code,  the received frame will be read after storing in the FIFO, so it's a bit weird.

Have a great day,
TIC

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