4 ms·

I don't think it's possible for the pi to also act as a host on its other USB port if you do this, is it?

xg15 3y ago
Seems true unfortunately, though you can at least switching between the modes somewhat convenient: https://forums.raspberrypi.com/viewtopic.php?t=282649 https://forums.raspberrypi.com/viewtopic.php?t=282649
- regularfry 3y ago
  Yeah, not quite what I'm after. I want usb microphone into usb gadget. Bit of a pain that getting audio in takes an extra hat otherwise.
simcop2387 3y ago
You should be able to do this with a pi 4, since the usb-c power port is also the gadget port. The usb 3.0 ones off the pcie bus on the pi should be completely independent from that and still work (not sure about the 2.0 ports or anything).
- regularfry 3y ago
  Oh, now that's interesting. Not quite the form factor I had in mind, but worth proving an idea or two out on. Thanks.
  - simcop2387 3y ago
    Yep, and if that does work for you, then you might be able to get closer to the form factor you want using a CM4. That said you'd have to learn how to design your own board for it and potentially handle the pcie lane. But that would be a much smaller starting footprint with it at least.
defparam 3y ago
One of the unfortunate things about the Raspberry Pi Zero is that the second micro usb is power only. For this type of configuration I encourage all to check out the Allwinner ARM-based SoCs and boards built from friendlyelec. With the NanoPi Neo I was able to enable USB ethernet gadget mode on its micro-usb and then have it host and power another device on its USB-A (for me a mobile phone). In my use case the laptop powered both the NanoPi and charging the mobile device all from USB power while also acting a an ethernet packet router from the mobile device back to the laptop all over USB on its own subnet. https://www.friendlyelec.com/index.php?route=product/product&path=69&product_id=132 https://www.friendlyelec.com/index.php?route=product/product...
- megous 3y ago
  Yeah, anything based on H3/H5 SoCs will work fine for this use case due to the SoCs having 4 separate USB host controllers, one of them muxed with OTG controller. That's a lot of I/O flexibility.
- hinkley 3y ago
  I ran out of ports on the usb charger I was using to run my little cluster so I have a couple of the lower power devices daisy chained off of the higher power ones. It does mean that some devices will power off unexpectedly when others restart but unexpected restarts are something you have to plan for anyway.
- roeles 3y ago
  Many clones have two usb ports, with one being OTG capable. For example the mango pi mq.
gte525u 3y ago
FWIW - I was able to do this using a pocketbeagle. We even did this for a small run product where Octavo SIP exposed USB Serial and Ethernet via gadget, and then was a host on the USB1 side.

xg15 3y ago

Seems true unfortunately, though you can at least switching between the modes somewhat convenient: https://forums.raspberrypi.com/viewtopic.php?t=282649 https://forums.raspberrypi.com/viewtopic.php?t=282649

regularfry 3y ago
Yeah, not quite what I'm after. I want usb microphone into usb gadget. Bit of a pain that getting audio in takes an extra hat otherwise.

simcop2387 3y ago

You should be able to do this with a pi 4, since the usb-c power port is also the gadget port. The usb 3.0 ones off the pcie bus on the pi should be completely independent from that and still work (not sure about the 2.0 ports or anything).

regularfry 3y ago
Oh, now that's interesting. Not quite the form factor I had in mind, but worth proving an idea or two out on. Thanks.
- simcop2387 3y ago
  Yep, and if that does work for you, then you might be able to get closer to the form factor you want using a CM4. That said you'd have to learn how to design your own board for it and potentially handle the pcie lane. But that would be a much smaller starting footprint with it at least.

defparam 3y ago

One of the unfortunate things about the Raspberry Pi Zero is that the second micro usb is power only. For this type of configuration I encourage all to check out the Allwinner ARM-based SoCs and boards built from friendlyelec. With the NanoPi Neo I was able to enable USB ethernet gadget mode on its micro-usb and then have it host and power another device on its USB-A (for me a mobile phone). In my use case the laptop powered both the NanoPi and charging the mobile device all from USB power while also acting a an ethernet packet router from the mobile device back to the laptop all over USB on its own subnet. https://www.friendlyelec.com/index.php?route=product/product&path=69&product_id=132 https://www.friendlyelec.com/index.php?route=product/product...

megous 3y ago
Yeah, anything based on H3/H5 SoCs will work fine for this use case due to the SoCs having 4 separate USB host controllers, one of them muxed with OTG controller. That's a lot of I/O flexibility.
hinkley 3y ago
I ran out of ports on the usb charger I was using to run my little cluster so I have a couple of the lower power devices daisy chained off of the higher power ones. It does mean that some devices will power off unexpectedly when others restart but unexpected restarts are something you have to plan for anyway.
roeles 3y ago
Many clones have two usb ports, with one being OTG capable. For example the mango pi mq.

gte525u 3y ago

FWIW - I was able to do this using a pocketbeagle. We even did this for a small run product where Octavo SIP exposed USB Serial and Ethernet via gadget, and then was a host on the USB1 side.