AM3352: [custom board based on AM335x ] Interrupt triggering late on UART6 intermittently

Sreevani M

Part Number: AM3352

Hi,

We are using AM3352 in one of our product, recently we have seen a issue while both UARTs(UART4, UART6) operating
simultaneously with 9600 and 38400 Baud rates consecutively.
Sometimes UART6 interrupt triggering is taking more time, where we are releasing tx enable pin, as we believe processor is doing receive job at UART4, we are not seeing this issue when there is no Communication on UART4. we suspect UART4 interrupt is at a higher priority than UART6.
Interrupt handles are marked with IRQF_NO_THREAD. so in this regard could you please let us know how to fetch priorities of the interrupts and also
how to configure the priorities.

Regards

Sreevani

over 3 years ago

0 Nick Saulnier over 3 years ago

TI__Guru** 100740 points

Hello Sreevani,

Please confirm what software you are running on the ARM core.

Regards,

Nick

0 Sreevani M over 3 years ago

Prodigy 20 points

HI Nick,

We are using Linux Kernel:4.9.28

Regards

Sreevani

0 Nick Saulnier over 3 years ago in reply to Sreevani M

TI__Guru** 100740 points

Hello Sreevani,

Apologies for the delayed response. I have reassigned our thread to our Linux UART owner.

Regards,

Nick

0 Bin Liu over 3 years ago in reply to Nick Saulnier

TI__Guru**** 167581 points

Hi Sreevani,

Sreevani M said:
simultaneously with 9600 and 38400 Baud rates consecutively.

Does it mean one UART is in 9600 and the other is in 38400? or both UARTs switch baud rate of 9600 and 38400 back and forth?

Have you tried the Processor SDK RT Linux to see it still has the same delay?

0 Sreevani M over 2 years ago

Prodigy 20 points

Part Number: AM3352

This thread is in continuation with the below query.

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1073247/am3352-custom-board-based-on-am335x-interrupt-triggering-late-on-uart6-intermittently?tempkey=9fe949af-caf2-4b94-b58f-759cf14a8edf

Questions from TI Team.

1. Does it mean one UART is in 9600 and the other is in 38400? or both UARTs switch baud rate of 9600 and 38400 back and forth?

--We will set baud rate only once (UART4 with 9600 and UART6 with 38400) and will not change the baud rate later.

2. Have you tried the Processor SDK RT Linux to see it still has the same delay?

-- No, Our platform currently supports GP Linux only.

Thanks

Sreevani

0 Bin Liu over 2 years ago in reply to Sreevani M

TI__Guru**** 167581 points

Hi Sreevani,

Thanks for the update.

kernel v4.9.28 is more than five years old and no longer supported on this forum. Could you please test with the kernel in the latest AM335x Processor SDK to see if the issue still happens?

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AM3352: [custom board based on AM335x ] Interrupt triggering late on UART6 intermittently