can usb set up notes

set_up_can_usb

@@ -0,0 +1,94 @@
+
+
+# example binding slcan to a USB tty serial port
+sudo slcand -o  -s3 -t hw -S 3000000 /dev/ttyACM3
+sudo ip link set dev can0 up type can bitrate 100000
+
+#
+## to upgrade usb devices  in chromium
+##
+#Creating a udev rule to grant write permissions to a USB device and automate updating a dongle involves the following steps:
+#1. Identify the USB Device
+#
+#Plug in the USB device or dongle and identify its attributes using lsusb or udevadm.
+#Using lsusb:
+#
+#Run:
+#
+#lsusb
+#
+#Find your device in the list. It will look something like this:
+#
+#Bus 001 Device 004: ID 1234:5678 Vendor_Name Product_Name
+#
+#    Vendor ID: 1234
+#    Product ID: 5678
+#
+#Using udevadm:
+#
+#Run:
+#
+#udevadm info --query=all --name=/dev/bus/usb/001/004
+#
+#(Replace 001 and 004 with the values from lsusb.)
+#
+#This command provides detailed information about the device, such as the idVendor and idProduct.
+#2. Create a udev Rule
+#
+#Create a new file for your custom udev rules in /etc/udev/rules.d/.
+#
+#For example:
+#
+#sudo nano /etc/udev/rules.d/99-usb-dongle.rules
+#
+#Add the following rule:
+#
+#SUBSYSTEM=="usb", ATTR{idVendor}=="1234", ATTR{idProduct}=="5678", MODE="0666"
+#
+#    Replace 1234 and 5678 with your device's Vendor and Product IDs.
+#    MODE="0666" grants read and write permissions to all users. For more restricted access, specify a group and set group ownership (e.g., GROUP="usbusers" and MODE="0660").
+#
+#3. Reload udev Rules
+#
+#After saving the rule, reload udev rules and trigger them:
+#
+#sudo udevadm control --reload-rules
+#sudo udevadm trigger
+#
+#4. Test Permissions
+#
+#Unplug and replug your device, then check the permissions:
+#
+#ls -l /dev/bus/usb/001/004
+#
+#(Replace 001 and 004 with the actual bus and device numbers.)
+#
+#It should now show the updated permissions.
+#5. Automate Dongle Updates
+#
+#If you have a script or tool to update the dongle, ensure it runs as the user with proper permissions. For example, create an update script:
+#
+##!/bin/bash
+#echo "Updating dongle..."
+## Replace with the actual command to update your dongle
+#your-update-command --device=/dev/bus/usb/001/004
+#
+#Make it executable:
+#
+#chmod +x update_dongle.sh
+#
+#Run the script after ensuring permissions are correct.
+#6. Optional: Match by Serial Number or Other Attributes
+#
+#If multiple devices share the same Vendor/Product IDs, you can refine the rule by matching additional attributes like serial, idProduct, or idVendor.
+#
+#Example:
+#
+#SUBSYSTEM=="usb", ATTR{idVendor}=="1234", ATTR{idProduct}=="5678", ATTR{serial}=="ABCDEFG12345", MODE="0666"
+#
+#You can find these attributes using:
+#
+#udevadm info --attribute-walk --name=/dev/bus/usb/001/004
+#
+#
+#