Hi guys, today I’ll show you a very cool featured introduced with Raspberry Pi 4!
In a previus post I writed about using a Raspberry Pi Zero/Zero W as a USB gadget, This allows them to be powered and accessed via one of the micro USB sockets and it shows up as both a CD-Drive and a ethernet device.
A few days ago a new Raspberry Pi 4 bootloader was released and allows us to use the Pi4’s type-c connection for power, network boot and data sharing! For more information about the bootloader check raspberrypi.org.
As always we need to install the new Raspbian OS, if you don’t know how to do that check my beginner page where I explain how to do that with different OS.
If you have already installed Raspbian Buster you can simple update the bootloader with this command lines:
sudo apt update sudo apt full-upgrade sudo apt install rpi-eeprom
Now we need to make a few changes in the config.txt and cmdline.txt files, the configuration is the same used in the Raspberry Pi Zero USB gadget but updated for Raspbian Buster, add this line at the end of config.txt:
and add this at the end of cmdline.txt:
you can edit directly from SD card or you can use the commands:
sudo nano /boot/config.txt sudo nano /boot/cmdline.txt
After that we need to add:
We are ready to configure the network sharing, to do that you need to install and configure dnsmasq
sudo apt install dnsmasq
/etc/dnsmasq.d/usb with the following content:
interface=usb0 dhcp-range=10.55.0.2,10.55.0.6,255.255.255.248,1h dhcp-option=3 leasefile-ro
To create the file you can use the command:
sudo nano /etc/dnsmasq.d/usb
With the same steps you need to create
/etc/network/interfaces.d/usb0 with the following content:
auto usb0 allow-hotplug usb0 iface usb0 inet static address 10.55.0.1 netmask 255.255.255.248
/root/usb.sh, a simple python script with the following lines of code:
#!/bin/bash cd /sys/kernel/config/usb_gadget/ mkdir -p pi4 cd pi4 echo 0x1d6b > idVendor # Linux Foundation echo 0x0104 > idProduct # Multifunction Composite Gadget echo 0x0100 > bcdDevice # v1.0.0 echo 0x0200 > bcdUSB # USB2 echo 0xEF > bDeviceClass echo 0x02 > bDeviceSubClass echo 0x01 > bDeviceProtocol mkdir -p strings/0x409 echo "fedcba9876543211" > strings/0x409/serialnumber echo "Ben Hardill" > strings/0x409/manufacturer echo "PI4 USB Device" > strings/0x409/product mkdir -p configs/c.1/strings/0x409 echo "Config 1: ECM network" > configs/c.1/strings/0x409/configuration echo 250 > configs/c.1/MaxPower # Add functions here # see gadget configurations below # End functions mkdir -p functions/ecm.usb0 HOST="00:dc:c8:f7:75:14" # "HostPC" SELF="00:dd:dc:eb:6d:a1" # "BadUSB" echo $HOST > functions/ecm.usb0/host_addr echo $SELF > functions/ecm.usb0/dev_addr ln -s functions/ecm.usb0 configs/c.1/ udevadm settle -t 5 || : ls /sys/class/udc > UDC ifup usb0 service dnsmasq restart
This script need to be run every time the Raspberry Pi is booted, to do that add
exit 0 line.
With this setup the Pi4 will show up as a ethernet device with an IP address of 10.55.0.1 and will assign the device you plug it into an IP address via DHCP. This means you can just ssh to [email protected] to start using it.
Hope you find it usefull and cool!