Interfacing (DSI, CSI, I2C, etc.) • how to force USB devices re-check ?

dears

I have a USB gamepad that is not always detected at boot time, after 1 reboot out of 5, the device does not appear in /dev/input. If I unplug the device and plug it back in, then it suddenly appears.

I have tried the following code at boot time to detect the presence of the gamepad and if not to reset the USB, but that does not seem to work :

if [ -e "/dev/input/js0" ]; then
echo "/dev/input/js0 found!"
else
echo "/dev/input/js0 not found. Retrying..."
for ((i = 1; i <= 5; i++)); do
# restart USB
sudo systemctl restart udev
sleep 0.5
if [ -e "/dev/input/js0" ]; then
echo "/dev/input/js0 found after retry $i."
break
fi
done
fi

Any idea how I could force "retries" ? Alternatively if this would be due to timings, is it possible to add a "pause" somewhere in the boot sequence prior the PI checking for USB devices ?

thanks for your help

Best Regards

John

Statistics: Posted by jcoe2412 — Wed Mar 27, 2024 8:19 pm — Replies 0 — Views 28

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