configure USB from self-powered mode to bus-powered mode

[adi2Intel]

Hi

were are working with 105x and testing usb features

we want to use the USB mode as USB self powered mode and not Bus powered 

using SDK examples 

1. How can we switch existing USB SDK example from self-powered mode to bus-powered mode?
2. can it be configured during runtime? or only one time on startup?

Thanks

Adi 

Intel

[jingpan]

Hi @adi2Intel ,

If you just want to doing a software change, you can modify bMaxPower field of USB Configuration Descriptor to a small value, each step is 2mA.

If you want to make a hardware change, you can even not connect USB interface VBUS line, just add a on board 5v to USB_OTG1_VBUS. USB can detect connection by D+/D-.

Regards,

Jing