topic IMXRT1176 Errors in i.MX Processors

IMXRT1176 Errors

Chethanbg — Tue, 28 Nov 2023 10:09:16 GMT

Hi,

We are using RT1170 MCU for our cluster application.

When we are connecting 7" LCD to our custom board out of 7 boards we are getting unknown errors as attached screenshot in 3 boards(while we are running the code, its going to 'usagefault handler' after some time, the time is not definite)and CPU frequency stops and it is in hanging condition.Without connecting LCD everything works just fine.

Attached is the MCU ,SDRAM and LCD Schematics for your reference.

Let us know what possibly causing this issue?

Re: IMXRT1176 Errors

Chethanbg — Thu, 30 Nov 2023 14:53:52 GMT

Any update on the ticket?

Re: IMXRT1176 Errors

Kan_Li — Fri, 01 Dec 2023 01:28:55 GMT

Hi @Chethanbg ,

If you have 7 custom boards, but 3 of them had this issue, I would suspect there might be some soldering issue on those boards, did rest of them behave normally as expected all the time? Please kindly clarify.

Have a great day,
Kan

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Re: IMXRT1176 Errors

Chethanbg — Fri, 01 Dec 2023 13:49:29 GMT

Hi,

All 7 boards have same issue but the time duration is different

3 boards are hanging after 20 secs and other 4 boards are hanging after 2 hours

Re: IMXRT1176 Errors

Kan_Li — Tue, 05 Dec 2023 08:14:52 GMT

Hi @Chethanbg ,

Was the frame buffer for the LCD in a none cache area? If not, please do so and check if the problem is still there.

Have a great day,
Kan

Re: IMXRT1176 Errors

Chethanbg — Wed, 06 Dec 2023 09:38:43 GMT

Hi @Kan_Li

We resolved issue .

As per recommendation FlexSPI_DQS pin should be left floating for 133Mhz.in our custom board we connected FlexSPI_DQS pin to GPIO function.

We reduced speed to 60Mhz now all the devices are working fine.

Thank you for your support

Thanks & Regards

Chethan B G