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authorJacob McDonnell <jacob@jacobmcdonnell.com>2026-04-25 19:55:43 -0400
committerJacob McDonnell <jacob@jacobmcdonnell.com>2026-04-25 19:55:43 -0400
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docs: Added All FreeBSD Manuals
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+<table class="head">
+ <tr>
+ <td class="head-ltitle">I2CTINYUSB(4)</td>
+ <td class="head-vol">Device Drivers Manual</td>
+ <td class="head-rtitle">I2CTINYUSB(4)</td>
+ </tr>
+</table>
+<div class="manual-text">
+<section class="Sh">
+<h1 class="Sh" id="NAME"><a class="permalink" href="#NAME">NAME</a></h1>
+<p class="Pp"><code class="Nm">i2ctinyusb</code> &#x2014;
+ <span class="Nd">driver for a USB / I2C bridge device</span></p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
+<p class="Pp">To compile this driver into the kernel, place the following lines
+ in your kernel configuration file:</p>
+<div class="Bd Pp Bd-indent"><code class="Cd">device i2ctinyusb</code>
+<br/>
+<code class="Cd">device usb</code>
+<br/>
+<code class="Cd">device iicbus</code></div>
+<p class="Pp">Alternatively, to load the driver as a module at boot time, place
+ the following line in <a class="Xr">loader.conf(5)</a>:</p>
+<div class="Bd Pp Bd-indent Li">
+<pre>i2ctinyusb_load=&quot;YES&quot;</pre>
+</div>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
+<p class="Pp">The <code class="Nm">i2ctinyusb</code> 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.</p>
+<p class="Pp">The <code class="Nm">i2ctinyusb</code> driver creates a
+ <a class="Xr">iicbus(4)</a> child bus to expose the iic functions, enabling
+ I2C sensors, converters and displays to be connected to any computer with a
+ USB port.</p>
+<p class="Pp">More information about this device can be found at:</p>
+<div class="Bd Pp Bd-indent Li">
+<pre>https://github.com/harbaum/I2C-Tiny-USB</pre>
+</div>
+<p class="Pp">and (for the Raspberry Pi Pico version):</p>
+<div class="Bd Pp Bd-indent Li">
+<pre>https://github.com/Nicolai-Electronics/rp2040-i2c-interface</pre>
+</div>
+<p class="Pp">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.</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="SEE_ALSO"><a class="permalink" href="#SEE_ALSO">SEE
+ ALSO</a></h1>
+<p class="Pp"><a class="Xr">iicbus(4)</a>, <a class="Xr">usb(4)</a></p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="HISTORY"><a class="permalink" href="#HISTORY">HISTORY</a></h1>
+<p class="Pp">The <code class="Nm">i2ctinyusb</code> driver and this manual page
+ was written by <span class="An">Denis Bodor</span>
+ &lt;<a class="Mt" href="mailto:dbodor@rollmops.ninja">dbodor@rollmops.ninja</a>&gt;.</p>
+</section>
+</div>
+<table class="foot">
+ <tr>
+ <td class="foot-date">February 18, 2024</td>
+ <td class="foot-os">FreeBSD 15.0</td>
+ </tr>
+</table>