AM2634: Example for RX FIFO mode of MCAN

Hi SI,

I'm looking into this and will get back with you shortly.

Regards,
Frank

Hi SI,

For Interrupt mode, did the customer start with the MCAN Loopback Interrupt example? https://software-dl.ti.com/mcu-plus-sdk/esd/AM263X/08_05_00_24/exports/docs/api_guide_am263x/EXAMPLES_DRIVERS_MCAN_LOOPBACK_INTERRUPT.html

For Polling mode, did the customer start with the MCAN Loopback Polling Example? https://software-dl.ti.com/mcu-plus-sdk/esd/AM263X/08_05_00_24/exports/docs/api_guide_am263x/EXAMPLES_DRIVERS_MCAN_LOOPBACK_POLLING.html

For loopback OFF in both cases, was the AM263x CAN transmitter, receiver, or both?

For the Polling mode failure, was the Rx data incorrect?

Sung-IL said:

Is there any other example to use RX FIFO mode in MCAN?

No, the only example in the SDK that uses the RX FIFO is the MCAN Loopback Polling Example.

Sung-IL said:

ould you please let me know how they can turn-off Loopback mode in MCAN Loopback Polling example?

Reviewing <SDK>\source\drivers\mcan\v0\mcan.c:MCAN_lpbkModeEnable(), it appears internal loopback mode can be disabled as follows:

MCAN_lpbkModeEnable(gMcanBaseAddr, MCAN_LPBK_MODE_INTERNAL, FALSE);

I don't currently have more insights into why Polling mode with loopback disabled would fail. If needed, I can try an experiment where I connect an AM263x CC MCAN1 to external device.

Regards,
Frank

Hi Frank,

Thanks for immediate response.

Frank Livingston said:

For Interrupt mode, did the customer start with the MCAN Loopback Interrupt example? https://software-dl.ti.com/mcu-plus-sdk/esd/AM263X/08_05_00_24/exports/docs/api_guide_am263x/EXAMPLES_DRIVERS_MCAN_LOOPBACK_INTERRUPT.html

For Polling mode, did the customer start with the MCAN Loopback Polling Example? https://software-dl.ti.com/mcu-plus-sdk/esd/AM263X/08_05_00_24/exports/docs/api_guide_am263x/EXAMPLES_DRIVERS_MCAN_LOOPBACK_POLLING.html

Yes. they used these loopback examples for interrupt and polling mode.

Frank Livingston said:

For loopback OFF in both cases, was the AM263x CAN transmitter, receiver, or both?

They found RX FIFO was not worked as expected with external equipment when loopback mode was turned-off.

Frank Livingston said:

For the Polling mode failure, was the Rx data incorrect?

They could not find any data in RX FIFO from external equipment when loopback mode was disabled.

Thanks and Best Regards,

SI.

Hi SI,

Thank for the feedback. I'll consult on this internally try some experiments. I'll get back with you next week.

Regards,
Frank

Hi Frank,

Thanks for your feedback. my customer decided to use interrupt mode.

Thanks and Best Regards,

SI.