TUSB8041: Device enter DOWNLOAD mode NG through TUSB8041

Skyler Zhang

Prodigy 20 points

Part Number: TUSB8041

HI Sir

We have plan to implement TUSB8041 solution in our project. we found a issue during our pre-validation.

The issue as belows:

Connected DEVICE, HUB, and PC as shown in the diagram,the device USB enumeration is OK.（Device is an Android board）

Then use the PC to send "adb reboot edl" command to DEVICE.normally,the USB enumeration will be redone,and the device will enter DOWNLOAD mode.

But we found HUBs will cause the device enter DOWNLOAD mode NG.

Without TUSB8041,device will re-enumeration and enter download mode normally.

Could you please teach me the reason?

over 1 year ago

0 Brian Zhou over 1 year ago

TI__Guru*** 146735 points

Hi:

what is "adb reboot edl" command suppose to do?

Regards

Brian

0 Skyler Zhang over 1 year ago in reply to Brian Zhou

Prodigy 20 points

Hi Brian

Thank you for your reply.

"adb reboot" is a restart command for Android,and "edl" is a download mode.

The "adb reboot edl" command is used to restart the device and enter DOWNLOAD（edl） mode.

When we use TUSB8041 to connect PC and device.Send this command to device.device will retart,but can't be re-enumeration. And it will shut down after enumeration fails.

Best regards

Skyler

0 Brian Zhou over 1 year ago in reply to Skyler Zhang

TI__Guru*** 146735 points

Skyler:

It is new to us and I will check with our system guy and get back to you soon.

Regadrs

Brian

0 Skyler Zhang over 1 year ago in reply to Brian Zhou

Prodigy 20 points

Hi Brain

Thank you for your attention. This issue has already caused a delay in our project,if you have any comments, please notify me immediately.

Best regards

Skyler

0 Brian Zhou over 1 year ago in reply to Skyler Zhang

TI__Guru*** 146735 points

Hi Skyler;

Did you Enable Developer options and USB debugging?

Sometimes Android devices have trouble communicating through certain USB ports or hubs due to the high throughput of data. To improve reliability:

Don't use USB extension cables or adapters if possible.
Try a different USB port. Rear ports are often more reliable than front ones.
If you're using a USB C port, try a USB A port instead.

Regards

Brian

Interface

Interface forum

TUSB8041: Device enter DOWNLOAD mode NG through TUSB8041