i2ctinyusb4
Driver for a usb / i2c bridge device
Usage
To compile this driver into the kernel, place the following lines in your kernel configuration file:
device i2ctinyusb device usb device iicbus
Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):
i2ctinyusb_load="YES"
Overview
The i2ctinyusb driver provides support for the device designed by Till Harbaum known as i2c-tiny-usb. This is initially a very simple circuit built with an Atmel AVR ATtiny45, but a Raspberry Pi Pico (RP2040) implementation also exists.
The i2ctinyusb driver creates a iicbus(4) child bus to expose the iic functions, enabling I2C sensors, converters and displays to be connected to any computer with a USB port.
More information about this device can be found at:
https://github.com/harbaum/I2C-Tiny-USB
and (for the Raspberry Pi Pico version):
https://github.com/Nicolai-Electronics/rp2040-i2c-interface
The I2C controller supports read and write transactions with up to 1024 bytes of data, and a write followed by the repeated start followed by a read transactions up to 1024 bytes. Zero length transfers are not supported.
Releases
Unchanged in 3 releases since FreeBSD 15.0-RELEASE.