On Thu, Oct 26, 2023 at 11:26:48AM +0800, Sadeep Madurange wrote:

Greetings all,

I am trying to connect an AVR programmer to Arch machine. I can't see it appearing under /dev.

I found the vendor and product ids using lsusb. I think the device is 16c0:05dc:

Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 001 Device 002: ID 058f:9540 Alcor Micro Corp. AU9540 Smartcard Reader Bus 001 Device 003: ID 046d:c52f Logitech, Inc. Unifying Receiver Bus 001 Device 004: ID 13d3:56bc IMC Networks [unknown] Bus 001 Device 005: ID 06cb:00bd Synaptics, Inc. Prometheus MIS Touch Fingerprint Reader Bus 001 Device 006: ID 8087:0026 Intel Corp. AX201 Bluetooth Bus 001 Device 009: ID 16c0:05dc Van Ooijen Technische Informatica shared ID for use with libusb Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub

I added the following to /etc/udev/rules.d/99-avrprogrammer.rules and restarted the machine:

SUBSYSTEM=="usb", ATTRS{idVendor}=="16c0", ATTRS{idProduct}=="05dc", GROUP="uucp", MODE=="0666"

I see the following in my dmesg when I insert the programmer:

[ 1526.700607] usb 1-4: new low-speed USB device number 9 using xhci_hcd [ 1526.849141] usb 1-4: New USB device found, idVendor=16c0, idProduct=05dc, bcdDevice= 1.04 [ 1526.849152] usb 1-4: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [ 1526.849156] usb 1-4: Product: USBasp [ 1526.849159] usb 1-4: Manufacturer: www.fischl.de

I'm checking the device by doing something like

ls /dev > before_plugging_in_programmer ls /dev > after_plugging_in_programmer vimdiff before_plugging_in_programmer after_plugging_in_programmer

Hi, Sadeep. The USBasp uses raw USB communication via libusb. It does not invoke any kernel drivers that would create a /dev device. The presence of the device in lsusb means it should be working. Go ahead and test it with avrdude. --Sean