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MQX FlexCAN FIFO message reception delay

mpfgregory — Fri, 15 Apr 2016 09:06:44 GMT

I'm using the MQX FlexCAN FIFO receive mechanism. It works fine except for a delay in message reception. When the first CAN message is received, the output of the FIFO is a message containing only zeroes. The same happens for messages 2-5. When the 6th CAN message is received, the output of the FIFO is the first CAN message that was received. It continues like this. The 7th message received brings the 2nd message to the FIFO output and so on.

Is this intended behavior? I know the FIFO is 6 message buffers deep.

I'm using MQX 4.0 with the Phytec patches for the PCM052. This version didn't contain the FlexCAN driver. A while back I integrated the FlexCAN Driver from MQX4.1 into it. I see this behavior with the FlexCAN example application.

Re: MQX FlexCAN FIFO message reception delay

rendy — Tue, 26 Apr 2016 12:07:03 GMT

Hello, yes this is known design flaw. However there is no plan for this to be patched.

Re: MQX FlexCAN FIFO message reception delay

mpfgregory — Wed, 27 Apr 2016 06:43:51 GMT

Hello Rene,

thanks for the answer. Is this a design flaw in the MQX driver, or is it a flaw of the CAN module on the Vybrid? If it's just the driver I would try to fix it. Else the FIFO is not useful for our application because we need the data in real time.

Re: MQX FlexCAN FIFO message reception delay

karina_valencia — Mon, 23 May 2016 16:13:32 GMT

rendy do you have an update?

Re: MQX FlexCAN FIFO message reception delay

rendy — Tue, 24 May 2016 14:01:46 GMT

Hi,

it's a software issue. Hardware works well.

Regards

Rene

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Re: MQX FlexCAN FIFO message reception delay

jjt — Thu, 26 Jan 2023 21:24:44 GMT

FWIW, the same bug is STILL present in MQX5 FlexCAN driver for K60.