AM623: USB host mode full-speed

stephen zhang

Intellectual 390 points

Part Number: AM623

Tool/software:

In host mode, is it possible to modify the register directly to force USB to drop to full-speed?

Or can modified the driver to achieve full-speed?

7 months ago

0 Anshu Madwesh 7 months ago

TI__Mastermind 19105 points

Hello,

Which SDK are you using on AM62x?

Thanks,

Anshu

0 stephen zhang 7 months ago in reply to Anshu Madwesh

Intellectual 390 points

Hi Anshu,

We are using SDK 09.00.00.03

Are there any differences in this for different SDK?

0 Anshu Madwesh 7 months ago in reply to stephen zhang

TI__Mastermind 19105 points

Hi Stephen,

I meant to ask which operating system you are doing this with? Like Linux, RTOS, etc.

TI offers different SDKs for different operating systems: https://www.ti.com/product/AM625#software-development

Apologies for the confusion.

Thanks,

Anshu

0 stephen zhang 7 months ago in reply to Anshu Madwesh

Intellectual 390 points

Hi Anshu,

Got it. We are using PROCESSOR-SDK-LINUX-AM62X. In our board we use both two USB2.0 ports on AM623. In host mode, we want to use Full-Speed mode when connecting devices. Is this possible?

0 Bin Liu 7 months ago in reply to stephen zhang

TI__Guru**** 170671 points

Hi Stephen,

No, it is not possible. The xHCI driver in Linux kernel doesn't provide an interface to limit the USB bus speed. The only solution is to use a USB full-speed hub.

0 stephen zhang 7 months ago in reply to Bin Liu

Intellectual 390 points

Hi Bin,

Is it possible that not use xHCI driver, but use musb driver instead?

0 Bin Liu 7 months ago in reply to stephen zhang

TI__Guru**** 170671 points

No, MUSB driver is for a different USB controller.

The USB controller used on AM62x only complies with xHCI Specification, so only the xHCI driver is applicable.

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AM623: USB host mode full-speed