I have a USB light sensor that I have been using for almost a year without any issues on a Raspberry Pi 3. I am now trying to use it on a Raspberry Pi Zero Wireless instead.
I followed the sensor manufacturer's documentation to create a udev rule on the Pi Zero (which was identical to the rule I had on the Pi3) in order to give the "pi" user permissions to use the USB device (as I don't want to use it as root):
sudo nano /etc/udev/rules.d/51-yoctopuce.rules
Added the following lines into the file:
# udev rules to allow write access to all users for Yoctopuce USB devices
SUBSYSTEM=="usb", ATTR{idVendor}=="24e0", MODE="0666"
I rebooted, and then ran the command from the manufacturer to use the sensor:
YModule inventory
It's at this point that I get an error message:
ERR: Cannot register usb: the user has insufficient permissions to access USB devices (ypkt_lin:406)
If I plug the same sensor into my RPi3 and run the same command, I instead get a list of the sensors serial numbers output to terminal (the expected output from this command).
If I run the command (on the Pi Zero) as root, i.e. sudo ./bin/YModule inventory, then the command runs correctly and the output is the serial number of the sensor (the expected output for the command).
So clearly there is a permission issue at play. I just don't know how to fix it.
I'm assuming there's an error somewhere in my udev rules, but I don't know where, given that the rule file on the Pi Zero is identical to the rule file on my (working) Pi 3 (which is identical to what is on the manufacturer's website).
Output of lsusb:
Bus 001 Device 002: ID 24e0:0050
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
The first device is the Yoctopuce light sensor (24e0 is definitely the correct vendor ID).
Output of sudo lsusb -v -d 24e0:0050:
Bus 001 Device 002: ID 24e0:0050
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 8
idVendor 0x24e0
idProduct 0x0050
bcdDevice 0.01
iManufacturer 1 Yoctopuce
iProduct 2 Yocto-Light-V3
iSerial 3 LIGHTMK3-1136C5
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 41
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
(Bus Powered)MaxPower 100mA
Interface Descriptor:
bLength 9 bDescriptorType 4 bInterfaceNumber 0 bAlternateSetting 0 bNumEndpoints 2 bInterfaceClass 3 Human Interface Device bInterfaceSubClass 0 No Subclass bInterfaceProtocol 0 None iInterface 0 HID Device Descriptor: bLength 9 bDescriptorType 33 bcdHID 1.11 bCountryCode 0 Not supported bNumDescriptors 1 bDescriptorType 34 Report wDescriptorLength 29 Report Descriptors: ** UNAVAILABLE ** Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x81 EP 1 IN bmAttributes 3 Transfer Type Interrupt Synch Type None Usage Type Data wMaxPacketSize 0x0040 1x 64 bytes bInterval 1 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x01 EP 1 OUT bmAttributes 3 Transfer Type Interrupt Synch Type None Usage Type Data wMaxPacketSize 0x0040 1x 64 bytes bInterval 1Device Status: 0x0000
(Bus Powered)
The contents of my directory /etc/udev/rules.d/ is: 51-yoctopuce.rules 99-com.rules
I also tried renaming it to 100-yoctopuce.rules, in case something in the 99-com.rules file was causing the issue, but that resulted in the same error.
My understanding is that after editing the rules file, all I have to do to apply it is to reboot the system. Is that right, or is there some command I'm missing?
Any suggestions please on how to go about fixing this? Thanks in advance.
Contents of the file /etc/udev/rules.d/99-com.rules (on Pi Zero):
SUBSYSTEM=="input", GROUP="input", MODE="0660"
SUBSYSTEM=="i2c-dev", GROUP="i2c", MODE="0660"
SUBSYSTEM=="spidev", GROUP="spi", MODE="0660"
SUBSYSTEM=="bcm2835-gpiomem", GROUP="gpio", MODE="0660"
SUBSYSTEM=="gpio*", PROGRAM="/bin/sh -c '\
chown -R root:gpio /sys/class/gpio && chmod -R 770 /sys/class/gpio;\
chown -R root:gpio /sys/devices/virtual/gpio && chmod -R 770 /sys/devices/virtual/gpio;\
chown -R root:gpio /sys$devpath && chmod -R 770 /sys$devpath\
'"
KERNEL=="ttyAMA[01]", PROGRAM="/bin/sh -c '\
ALIASES=/proc/device-tree/aliases; \
if cmp -s $ALIASES/uart0 $ALIASES/serial0; then \
echo 0;\
elif cmp -s $ALIASES/uart0 $ALIASES/serial1; then \
echo 1; \
else \
exit 1; \
fi\
'", SYMLINK+="serial%c"
KERNEL=="ttyS0", PROGRAM="/bin/sh -c '\
ALIASES=/proc/device-tree/aliases; \
if cmp -s $ALIASES/uart1 $ALIASES/serial0; then \
echo 0; \
elif cmp -s $ALIASES/uart1 $ALIASES/serial1; then \
echo 1; \
else \
exit 1; \
fi \
'", SYMLINK+="serial%c"
