Thanks to a very helpful blog post, I managed to resolve the permissions issue for my USBtiny ISP programmer. As I mentioned in my previous post, I had a permissions error when using it with AVRDUDE, and I wasn’t sure where or how to resolve the issue. As it turns out, there’s a standard config folder where I could just edit a simple file that resolves everything.
Firstly, I needed to see what the vendor and product ID’s of the USB device where. That’s easy to get in Linux with the following command:
[paulo@deku ~]$ lsusb
. . .
Bus 002 Device 004: ID 1781:0c9f Multiple Vendors USBtiny
. . . That ID lists the vendor:product IDs. Once you have those, browse on over to /etc/udev/rules.d to make a file called 99-usbtiny.rules, and enter the following:
# Set Group for USBtiny
SUBSYSTEM=="usb", ATTRS{idVendor}=="1781", ATTRS{idProduct}=="0c9f", GROUP="uucp"As long as you make sure that your user is a member of the group uucp, then you can now use the programmer without a hitch. As the original blog post lists, I have to note that uucp is a group for Arch Linux, and that this will no doubt be different for other distros. Either way, I’m happy to have another issue resolves, and another lesson learned.