Turning off USB port or on
January 28, 2024, 08:35
Hello! I wanted to ask how can i turn off an USB port or turn it off on the rpi in python? It would really help, thanks!
just asking, why?
I have an USB fan for extra cooling
Would be nice if i would be able to turn it on / off remotely
ah ok
one second
pi4 or pi5?
Pi5
Srry for a late response because i was eating lol
its alright
https://raspberrypi.stackexchange.com/questions/5407/how-can-i-cut-power-coming-out-of-the-pis-usb-ports nothing specific to the pi 5 but the responses are very controversial
one person says just straight up no
> No, the usb power is hardwired straight to the RPi power.
>
> You can interrupt the power to the fan with a transistor or a relay, but you'll have to cut the red wire.
what about this thing https://github.com/mvp/uhubctl
whilst another gives you ways to do so:
>
>
> You can use my tool uhubctl, it supports Raspberry Pi models B+, 2B, 3B, 3B+ and 4B - these models have hardware ability to turn USB power off and on.
>
> Use it like this:
>
> Turn off power to all USB ports (must use port 2):
>
>
sudo uhubctl -l 1-1 -p 2 -a 0> > Turn on power to all USB ports (must use port 2): > >
sudo uhubctl -l 1-1 -p 2 -a 1> > Turn off power to Wifi+Ethernet (must use port 1): > >
sudo uhubctl -l 1-1 -p 1 -a 0> > Note that Raspberry Pi 4B is very different from previous models as it has USB3 chip. It doesn't support turning off power to Wifi+Ethernet, and for USB you will need to use something like that to turn off (this turns off all USB ports - RPi 4B hardware does not support individual port power control): > >
sudo uhubctl -l 2 -a 0> > If your Raspberry Pi does not support USB power switching, you can connect external USB hub that does (see list of compatible models), and control power on that external hub using uhubctl.
was just gonna mention that
yh
should i like do os.system("cmd")
cmd as the command
no clue
and these arent dont even specify that it works with the pi 5 your reaching for it
Im going to try
1 sec
ok
what does the 1 - 1 do
Is there a cmd that finds all the things that are connected
The one USB bus should be seen as a branch on a tree, visual by lsusb -t
/: Bus 04.Port 1: Dev 1, Class=root_hub, Driver=xhci-hcd/1p, 5000M /: Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci-hcd/2p, 480M /: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci-hcd/1p, 5000M /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci-hcd/0p, 480MPrints that
How can i find out which port it is in bc i dont know in which one they start / which order its in
on the rpi
lsusb -t
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 5000M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/1p, 480M
|__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/4p, 480M
|__ Port 4: Dev 4, If 0, Class=Mass Storage, Driver=uas, 480M
I forgot to format it
whoops
So sudo uhubctl -l 1-1 -p 4 is my SSD (class=Mass storage"
So it doesnt recognize mine
ig
Im going to try with the pi 4
That was from my Pi4
1 sec
Looks like its an problem from the Rpi5 itself
On the pi 4 it works
Probably a driver issue
I don't remember if Pi5 has an different USB chip than Pi4
Dont think so
Pi 4 - Broadcom BCM2711
Pi 5 - Broadcom BCM2712
Ohh
alr then
Ill try to make something
That works
But do you know if k3s is supported on the rpi 5 or no
doesnt it use the secondary chip for usb and gpio?
Correct, "their own" but normally you buy "IP blocks" that you implement on your chip
RP1 is their own chip
no i dont mean the RP1 chip but dont they have 2 chips now? i know the secondary is connected to the gpio so you cant overvolt the main chip but not sure if its also for usb
RP1 is the main chip right?
RP1 is a chip with for example IP blocks from Synopsys for the USB.
https://datasheets.raspberrypi.com/rp1/rp1-peripherals.pdf
Controls:
- GPIO
- UART
- RIO
- PWM
- I2C
- SPI
- I2S
- TICKS
- SDIO
- USB
- PCI Express endpoint controller
- Ethernet
- Displays and cameras
- DMA
oh so the RP1 chip isnt the main?
ignore me then
main? No its not the MCU that controls RAM, HDMI
ok i just learnt something new
RP1 is the I/O chip
ah
ok ignore me.
So to get an understanding if the USB supports power on/off the driver for "Synopsys IP dwc_usb3, v3.30b" needs to be checked
This is the main chip
yes
<@1071178789939331253> And you are correct, Pi5 have a Broadcom BCM2712 that has USB I/O but that is not used. Pi uses its own RP1 as you reminded me off
Thx
you taught me something too