Concerto USB issue (USB0ID pin must be pulled high)

Damon Stokes

On our board with the Concerto F28M36P device, we can only communicate to the DSP (the device) from our PC (the host) over USB if the USB0ID pin on the DSP is configured as a USB analog pin and pulled low. We are using code derived from the usb_dev_chidcdc example project. According to the technical reference manual for the F28M36P device, the USB0ID pin should not be needed for device (non-OTG) operation. Is this a known issue with the experimental silicon (to be corrected in the production silicon) or an issue with the TI USB driver library (to be corrected in a future driver release)? We were planning to use the ID pin on the part as a GPIO. Thanks.

over 13 years ago

0 Damon Stokes over 13 years ago

Prodigy 120 points

Correction - the USB ID pin must be pulled high (not low) for our board to talk to the PC over USB.

0 Trey German289 over 13 years ago in reply to Damon Stokes

TI__Mastermind 22025 points

Damon,

The technical reference guide is correct, but you must set a bit in the general purpose control and status register to statically set the value of the ID signal internally. Take a look at the register at offset 0x41C. I believe you'll need to set DEVMODOTG to a 1 and DEVMOD to a 1 as well.

Regards,

Trey

0 Damon Stokes over 13 years ago in reply to Trey German289

Prodigy 120 points

Thanks Trey - that fixed the issue!

0 Trey German289 over 13 years ago in reply to Damon Stokes

TI__Mastermind 22025 points

Glad I could help out! :)

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Concerto USB issue (USB0ID pin must be pulled high)