USB star config

0

I'm facing the following scenario: Step1: I have a board (device1) that has a USB stick (device2) connected to it. Step2: I have to unplug the USB stick (device2) and connect the board (device1) to a workstation (device3) in order to execute commands, flash, etc.

  • Step1: I need to connect USB_Device1 as master to USB_Device2 as slave.
  • Step2: I need to connect USB_Device1 as slave to USB_Device3 as master.

Step1 and Step2 are sequential. I tried using a USB switch box, but it does not work because slave and master physical position in the USB box cannot be reversed.

Diagram

Dobreanu Nicolae

Posted 2020-01-29T15:43:44.263

Reputation: 1

1It might be better to explain your use case. What are you trying to do? – spikey_richie – 2020-01-29T15:47:20.420

I'm facing the following scenario: Step1: I have a board (device1) that has connected to it an USB stick (device2) Step2: I have to unplug the USB stick (device2) and connect the board (device1) to a workstation (device3) in order to execute commands/flash/etc – Dobreanu Nicolae – 2020-01-29T16:16:55.077

2@DobreanuNicolae Please don’t clarify in comments but rather edit your question to clarify it. – JakeGould – 2020-01-29T16:35:45.850

Answers

0

USB ports are either host-ports (master) or device-ports (slave).
They can't be BOTH at the same time. The USB standard simply doesn't support that.

So your device 1 needs to have at least 2 USB ports. 1 slave and 1 master port.
And then it is just a matter of connecting them in the right order.

But normally you will NOT be able to control device 2 from device 3. They will be on 2 different USB bus systems.
Only if device 1 contains software that emulates a USB hub it can appear to device 3 as if it is a hub to which device 2 is connected.

Tonny

Posted 2020-01-29T15:43:44.263

Reputation: 19 919

They are not hosts at the same time, there is a diagram attached to the question. – Dobreanu Nicolae – 2020-01-29T16:13:31.713

@DobreanuNicolae You will have to really clarify your setup and what you exactly want to achieve. Currently it is highly unclear. That diagram is pretty meaningless as it doesn't provide any more information than your written question. – Tonny – 2020-01-29T16:19:37.720

'm facing the following scenario: Step1: I have a board (device1) that has connected to it an USB stick (device2) Step2: I have to unplug the USB stick (device2) and connect the board (device1) to a workstation (device3) in order to execute commands/flash/etc – Dobreanu Nicolae – 2020-01-29T16:21:09.387

Asked: 2020-01-29T15:43:44.263

Viewed: 53 times

Active: 2020-01-29T23:20:14.613