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VLuky
VLuky
Associate II
March 27, 2021
Question

USB Device HUB class on f103

  • March 27, 2021
  • 2 replies
  • 1205 views

Is it possible to implement device HUB?

(i want my f103 to appear as usb HUB to host PC)

Like a compound device. Cant find any example for some reason.

This topic has been closed for replies.

2 replies

waclawek.jan
waclawek.jan
Super User
March 27, 2021

You can probably mimic a hub, but with no attached devices. Each device (including the hub) have unique address on the bus, which is handled in hardware.

JW

VLuky
VLukyAuthor
Associate II
March 27, 2021

Well i will just mimic devices too(that is my intention actually).

Hardware address handling look like root of problems to me - after reply with all HUB descriptors, device get addressed. And then, i suspect, usb peripheral will ignore all the data which is not our address, right? And all data that should go to virtual devices will be ignored.

waclawek.jan
waclawek.jan
Super User
March 27, 2021

> Hardware address handling look like root of problems to me

That's why I said "with no attached devices". The hub is a device, too, so it has it's own address; and the hardware in STM32 won't handle other than one address.

JW

VLuky
VLukyAuthor
Associate II
March 28, 2021

Obvious follow-up question then: is there is any external USB-SPI bridges or phy chips that do not have that address feature, and generate interrupt every time?

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