AM625: When using an MCU timer on Linux, the timer fails to trigger an interrupt

Hello Cao,

Help me understand:

1) It looks like you are using the MCU Timer from the MCU Domain M4F core, instead of the Linux A53 core or the DM R5 core. is that correct?

2) Did the timer trigger properly when loading the M4F from CCS, and then stop triggering when you were loading the M4F core while Linux was running on the A53 core?

Regards,

Nick

Answer 1):yes.

Answer 2):The M4F core loading mode is debugged by CCS loading after the A53 starts Linux.

Hello Cao,

Understood. I am sending your thread over to a team member more familiar with the MCU+ cores than I am to comment. Feel free to ping the thread if you do not get a response within a couple of business days.

From the Linux side, it looks like the mcu_timer instances are defined in arch/arm64/boot/dts/ti/k3-am62-mcu.dtsi, but they are all set to status = "reserved";. So I do not expect that Linux is trying to grab the MCU timer and mess with it while the M4F is trying to use it.

Regards,

Nick

Hello Cao,

Thanks for the question.

Before I move ahead can I get to know the SysConfig version you are using for your setup?

Also, are you trying to do some sort of Application profiling? As in are you trying to compute time/cpu Clock Cycles for some sub-operation within your application?

Regards,

Vaibhav

1. The SysConfig version I used:

2. Also, are you trying to do some sort of Application profiling? As in are you trying to compute time/cpu Clock Cycles for some sub-operation within your application?

no.

Hi Cao,

Thanks for your response, expect a follow up response within a day.

Best Regards,

Vaibhav

Hello,

The same configuration can be run on AM64x, but not on AM62x. Is there any difference between 62x and 64x? Or can you provide a case of timer test?

Hi Cao,

So the code you wrote is working on AM64x, but not on AM62x. This is what I understand from your response.

Can you please forward me the code here.

Also, I am attaching a code snippet for a timer callback. This can be found under: MCU_PLUS_SDK_INSTALL_PATH\examples\networking\lwip\enet_lwip_cpsw\test_enet_cpsw.c

Regards,

Vaibhav

Hi Cao,

I would also encourage you to go through: https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1132695/am625-timer-interrupt-enable

Regards,

Vaibhav

You got me wrong. My program runs on 62x. I refer to the 62x configuration to switch to the 64x platform can work properly.

I would like to know whether you can normally use the timer of M4F on the 62x platform by installing my above configuration.

empty_am62x-sk_m4fss0-0_nortos_ti-arm-clang.zip

The above is my project of this test, please check whether there is any wrong configuration.

Hi Cao,

Can you also tell me the method of SoC Initialization you have done?

Regards,

Vaibhav

Hi Cao,

Just wanted to update one more point.

DebugP_log seems to not work as you can see in the screenshot attached in one of the replies above.

Because of which you see TimerCallback!! is not getting shown on the console.

I have used printf and it works just fine.

Regards,

Vaibhav

Hello,

You mean that it is working normally, but it is not visible because of the print display, right?

Hello Cao,

Thats what it seems like.

I also put a breakpoint inside TimerCallback to which its hitting.

Just replace the printing APIs if you want to see the logs on console. Hope this helps.

Regards,

Vaibhav