AM62A7-Q1: How to set the Partial-IO wake-up source about MCU_CAN RX PIN to be Low Active Level triggered mode to wake up device.

Arthur Chen

Prodigy 40 points

Part Number: AM62A7-Q1
Other Parts Discussed in Thread: AM62A7

Tool/software:

Hello TI experts,

We met issue about Partial-IO wake up source, MCU_CAN RX PIN working mode on TI platform.

Our environment is as following:

TI SDK BSP version: V09_00_02

Linux version: 6.1.80

We purchased TI AM62A7-SK-EVM and followed 3.2.2.12.5. Low Power Modes — Processor SDK AM62x Documentation to set MCU_CAN0 & MCU_CAN1 to be Partial-IO wake-up source.

It works, but the MCU_CAN RX PIN was kept about 0.6V and easily to be triggered by any high or low level changes on TI AM62A7-SK-EVM.

In general CAN PHY transceiver's action, MCU_CAN RX should be kept 3.3V and working to be low level for signal announcement.

When we connected the CAN PHY transceiver and MCU_CAN RX on TI AM62A7-SK-EVM.

And We do Partial-IO setiing then enter low power mode. The TI AM62A7-SK-EVM is waked up immediately.

The cause is that AM62A7 is triggerd by CAN PHY transceiver default 3.3V level...

To solve this issue.

Is there any way to set Partial-IO wake up source, MCU_CAN RX PIN to be trigger mode in low level trigger?

11 months ago

0 Anshu Madwesh 11 months ago

TI__Mastermind 19615 points

Hi Arthur,

I'm currently looking into this and will provide a response by Monday next week.

Best Regards,

Anshu

0 Anshu Madwesh 11 months ago in reply to Anshu Madwesh

TI__Mastermind 19615 points

Hi Arthur,

You could try changing the PADCONFIG register for the MCAN signal. Refer to Section 14.2.1.2 Pad Configuration Register: https://www.ti.com/product/AM62A7

Try changing Bit 7 and 8 based on your requirement.

Best Regards,

Anshu

0 Arthur Chen 11 months ago in reply to Anshu Madwesh

Prodigy 40 points

Hello Anshu,

Looks like it is under wkup domain. It is denied accession from Linux 'devmem2'.

Is there any configuration support in devicetree or command setting via TISCI client?

How could we access the MMR registers via Linux 'devmem2' in different domain?

BTW, could you help to provide tracing flow about wakeup source setting enabling during Linux poweroff for TISCI client control?

0 Anshu Madwesh 11 months ago in reply to Arthur Chen

TI__Mastermind 19615 points

Hi Arthur,

Arthur Chen said:
Looks like it is under wkup domain. It is denied accession from Linux 'devmem2'.

Can you share the logs of this error message?

Arthur Chen said:
Is there any configuration support in devicetree or command setting via TISCI client?

I will check with the development team if there any possibility through the device tree. It won't be possible through the TISCI client.

Arthur Chen said:
BTW, could you help to provide tracing flow about wakeup source setting enabling during Linux poweroff for TISCI client control?

Can you clarify what this means? In terms of TISCI calls, you can refer to a similar log list for Deep Sleep here, but nothing for Partial IO: https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1323581/faq-processor-sdk-am62x-a-p-how-can-we-debug-deep-sleep-on-am62x-am62a-am62p-using-sysfw-trace/5103970#5103970

Best Regards,

Anshu

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AM62A7-Q1: How to set the Partial-IO wake-up source about MCU_CAN RX PIN to be Low Active Level triggered mode to wake up device.