usb ethernet device not function

Ran,

Have you checked the below user guides?

processors.wiki.ti.com/.../TI81XX_PSP_USB_Driver_User_Guide
processors.wiki.ti.com/.../DM81xx_AM38XX_USB_User_Guide
processors.wiki.ti.com/.../Usbgeneralpage

processors.wiki.ti.com/.../TI81XX_PSP_04.04.00.02_Release_Notes
processors.wiki.ti.com/.../TI81XX_PSP_04.04.00.02_Release_Notes

processors.wiki.ti.com/.../USB_Debug_Techniques

Regards,
Pavel

Hi Pavel,

Thank for the links, I've reviewed them but they do not give me yet the answers.
We confinue debugging the usb0 port, but still with no results.
This is what we have this far:
1. Using this same port (usb0) as host with flash device connected - works OK
2. Using this port (usb0) as Device , and trying to work as gadget storage - no indication at all in PC.
3. The software is using excatly the same config + kernel as in EVM (and in EVM device works) - except for pinmux and minor changes in board file, which non is related to usb.
What can cause the device to mallfunction ? Is it some clock/crystal issue which is different from EVM ?

We have no clue it how to continue debugging the issue ? Why does the host detect storage with EVM and doesn't detect anything with the custom board ?

Regards,
Ran

Ran,

Ran Shalit said:

3. The software is using excatly the same config + kernel as in EVM (and in EVM device works) - except for pinmux and minor changes in board file, which non is related to usb.
What can cause the device to mallfunction ? Is it some clock/crystal issue which is different from EVM ?

If this is working fine on EVM, then I suspect this is HW issue. Please double check the DM814x datasheet, USB section and EVM schematics.

www.ti.com/.../spraar7c.pdf

Hi Pavel,

We continue inquire this, but got no results this far.
The hardware seems to be identify to EVM in terms of usb pins and voltage.

Regrards,
Ran

Hi Pavel,

Can it be related to ti814x_sata_pllcfg() call which is being under remark in my code (otherwise the kernel freeze) ?

Thank you,
Ran

Hi,

Another thing I've noticed is that EVM uses PG 2.1, while custom board uses PG 3.0. Can there also be some failure with this PG ?

Thank you,
Ran

Ran,

Yes it can. Check DM814x Silicon errata for differences between 2.1 and 3.0 devices. Make sure you are also using the latest code base for u-boot and linux kernel.

Regards,
Pavel

Hi Pavel,

Thanks, unfortunately I've found no issue in errata related to usb gadget, and also checked the source and see that it is synced with git.

Regards,
Ran

Hi,

Is there a way to debug each usb pin, that it detects the signal from output correctly (this will prove that the HW lines from usb connector to Soc is OK.

Thanks,
Ran

You mention that you changed the the connector from a mini-B on the EVM to a standard B on your custom board. The standard B does not the extra ID pin determine role and is not suitable for OTG. On your custom board, how are you handling the ID line?

Hi Norman,

We first grounded the usb_id pin and then we got correct detection of host. Then we made several changes in the board, one of them related to the ID pin, and now we can't detect both host and device...

Please see below the changes that were made on the board, in order to make the USB_ID line connection identical to the one on the DaVinci EVB.

Currently, I can’t point out which of the changes caused the Host mode to be non-operational.

1. Wire-add between U9 pins #8 and #3 and a wire-add between U9 pins #7 and #4, in order to bypass the electronic switch and make sure that the DaVinci USB port is connected to the Device connector P8 (Type B).

2. Removing R79 in order to disconnect the pull-up from USB_ID line

3. Disconnecting the Q3 (MOSFET) drain (pin#3) from the USB_ID line, in order to prevent the pull-down.

This is the schematics for the USB:

Regards,

Ran

My background is mainly fimrware. I cannot comment on your schematic. Hopefully others more knowledgable will comment. The ID pin is grounded for the host role and left floating for the device role. I have found that USB lines are very sensitive to impedance. For example splcing in an multimeter is usually enough to stop enumeration.