iMX8MP FlexCAN DMA Example

[nickager]

Hi,

Is there an example of using DMA with FlexCAN on the CortexM7 in the iMX8MP. I have found a post about how to setup RX FIFO but the FIFO appears to be fixed at 6 messages whereas I am receiving 8 CAN messages every 15ms and am seeing sporadic FIFO buffer overruns.

Relevant links:

• mcuxpresso: FlexCAN eDMA Driver 
• mcuxpresso: Receive FIFO Operation 
• Forum: Flexcan-FD FIFO Example 
• Forum: Is it possible to have an RX FIFO larger than 6 message depth 

but unfortunately none of the above posts has enabled me to piece together working FlexCAN DMA code. An example would be really helpful.

Many thanks

Nick

[Sanket_Parekh]

Hi @nickager,

I hope you are doing well

Is there an example of using DMA with FlexCAN on the CortexM7 in the iMX8MP

=> Please refer to the drivers/fsl_flexcan.c file from the SDK of IMX8M Plus.

The void FLEXCAN_EnableRxFifoDMA() function Enables or disables the FlexCAN Legacy/Enhanced Rx FIFO DMA request. 

Please refer to the MCUXpresso SDK Builder to download the latest version of the SDK.

Thanks & Regards,
Sanket Parekh