AM5728: TMS320C66x: I2C_CMD_PROBE occasionally stuck failing after reboot

Richard Roth1

Prodigy 170 points

Part Number: AM5728
Other Parts Discussed in Thread: AM5726

Tool/software:

Hello,

I have a number of slave devices on the bus that occasionally, after a restart, are not able to be probed.

I2C_STATUS_SUCCESS == I2C_control(i2c_data->i2c_handle, I2C_CMD_PROBE, <device>)

is failing

In the error case I am attempting to reset the bus via the following:

I2C_STATUS_SUCCESS == I2C_control(i2c_data->i2c_handle, I2C_CMD_RECOVER_BUS, &delay)

Which reports that the bus was successfully recovered, but ALL slave devices still fail the probe.

Any information on how to recover from this situation or what to debug would be greatly appreciated.

PDK in use: pdk_am57xx_1_0_17

Best Regards,

Richard

5 months ago

0 Josue Zamitiz-Ayala 5 months ago

TI__Mastermind 32295 points

Hello Richard,

The title to your question is confusing, yet because of the content I am assuming you are working on an AM57 device? Can you confirm? Also, can you share the SDK version you are working on?

-Josue

0 Richard Roth1 5 months ago in reply to Josue Zamitiz-Ayala

Prodigy 170 points

Hello,

Yes, AM5726 to be exact (sorry for the AM5728 in the title)

The code in question / issue is on the C66x DSP

SDK: PROCESSOR-SDK-RTOS-AM57X Version 06.03.00.106

0 Josue Zamitiz-Ayala 5 months ago in reply to Richard Roth1

TI__Mastermind 32295 points

Hello Richard,

Let me ask you some clarifying questions:

Richard Roth1 said:
after a restart

Is this a cold or warm reset?

Richard Roth1 said:
In the error case I am attempting to reset the bus via the following:

I2C_STATUS_SUCCESS == I2C_control(i2c_data->i2c_handle, I2C_CMD_RECOVER_BUS, &delay)

Have you checked the status of the SCL or SDA lines?

-Josue

0 Richard Roth1 4 months ago in reply to Josue Zamitiz-Ayala

Prodigy 170 points

Hello,

Warm reset. A cold reset resolves the issue

The issue is not very easy to reproduce so we have not yet gotten as far as checking everything with an oscilloscope

Are you aware of any additional software measures/fixes/etc that could resolve this issue?

0 Josue Zamitiz-Ayala 4 months ago in reply to Richard Roth1

TI__Mastermind 32295 points

Richard,

Not that I know of. Can you explain what you mean by not very easy to reproduce? Only happens on one board? happens once out of 100 warm resets?

-Josue

0 Richard Roth1 4 months ago in reply to Josue Zamitiz-Ayala

Prodigy 170 points

Hello,

Sorry for my slow replies.

I have spoken to the original reporter of the issue, and at this time they are not able to reproduce the issue reliably. It has only occurred 2x in a lab environment.

0 Josue Zamitiz-Ayala 4 months ago in reply to Richard Roth1

TI__Mastermind 32295 points

Understood.

Sounds like a possible HW issue.

-Josue

Processors

Processors forum

AM5728: TMS320C66x: I2C_CMD_PROBE occasionally stuck failing after reboot