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<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
<head>
<meta charset="utf-8" />
<meta name="generator" content="pandoc" />
<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes" />
<title>Release Notes for STM32Cube USB Host Library</title>
<style type="text/css">
code{white-space: pre-wrap;}
span.smallcaps{font-variant: small-caps;}
span.underline{text-decoration: underline;}
div.column{display: inline-block; vertical-align: top; width: 50%;}
</style>
<link rel="stylesheet" href="_htmresc/mini-st_2020.css" />
<!--[if lt IE 9]>
<script src="//cdnjs.cloudflare.com/ajax/libs/html5shiv/3.7.3/html5shiv-printshiv.min.js"></script>
<![endif]-->
<link rel="icon" type="image/x-icon" href="_htmresc/favicon.png" />
</head>
<body>
<div class="row">
<div class="col-sm-12 col-lg-4">
<center>
<h1 id="release-notes-for-stm32cube-usb-host-library">Release Notes for <mark>STM32Cube USB Host Library</mark></h1>
<p>Copyright © 2015 STMicroelectronics<br />
</p>
<a href="https://www.st.com" class="logo"><img src="_htmresc/st_logo_2020.png" alt="ST logo" /></a>
</center>
<h1 id="purpose">Purpose</h1>
<p>The USB host library comes on top of the STM32Cube™ USB host HAL driver and offers all the APIs required to develop an USB host application.</p>
<p>The main USB host library features are:</p>
<ul>
<li>Support of multi packet transfer features allowing the reception of big amount of data without splitting it into max packet size transfers.</li>
<li>Support of most common USB Class drivers (HID, CDC, MSC, MTP, AUDIO1.0)</li>
<li>Configuration files to interface with Cube HAL and change the library configuration without changing the library code (Read Only).</li>
<li>32-bits aligned data structures to handle DMA based transfer in High speed modes.</li>
</ul>
<p>Here is the list of references to user documents:</p>
<ul>
<li><a href="https://www.st.com/resource/en/user_manual/dm00105256-stm32cube-usb-host-library-stmicroelectronics.pdf">UM1720</a> : STM32Cube USB host library User Manual</li>
<li><a href="https://wiki.st.com/stm32mcu/wiki/USB_overview">Wiki Page</a> : STM32Cube USB Wiki Page</li>
</ul>
</div>
<div class="col-sm-12 col-lg-8">
<h1 id="update-history">Update History</h1>
<div class="collapse">
<input type="checkbox" id="collapse-section22" checked aria-hidden="true"> <label for="collapse-section22" aria-hidden="true">V3.5.5 / 24-June-2026</label>
<div>
<h2>
Main Changes
</h2>
<table>
<thead>
<tr class="header">
<th>Headline</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td><strong>Core</strong></td>
</tr>
<tr class="even">
<td>Add SW_Security_Level.md file</td>
</tr>
<tr class="odd">
<td><strong>USB Classes</strong></td>
</tr>
<tr class="even">
<td>Improve data buffers memory management</td>
</tr>
<tr class="odd">
<td>Fix muli instance support</td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="collapse">
<input type="checkbox" id="collapse-section21" aria-hidden="true"> <label for="collapse-section21" aria-hidden="true">V3.5.4 / 29-September-2025</label>
<div>
<h2>
Main Changes
</h2>
<table>
<thead>
<tr class="header">
<th>Headline</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td><strong>Core</strong></td>
</tr>
<tr class="even">
<td>SLA0044 Legal terms updated to latest revision (Rev 6 / October 2025)</td>
</tr>
<tr class="odd">
<td>Improve re-enumeration process</td>
</tr>
<tr class="even">
<td><strong>HID Class</strong></td>
</tr>
<tr class="odd">
<td>Improve interface pipe deallocation</td>
</tr>
<tr class="even">
<td><strong>MSC Class</strong></td>
</tr>
<tr class="odd">
<td>Correct command block length 6</td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="collapse">
<input type="checkbox" id="collapse-section20" aria-hidden="true"> <label for="collapse-section20" aria-hidden="true">V3.5.3 / 26-September-2024</label>
<div>
<h2>
Main Changes
</h2>
<table>
<thead>
<tr class="header">
<th>Headline</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td><strong>Core</strong></td>
</tr>
<tr class="even">
<td>Improve usage of CMSIS RTOS message queue</td>
</tr>
<tr class="odd">
<td>Add new API to allow activating USB host pipe from STM32 HAL</td>
</tr>
<tr class="even">
<td><strong>HID Class</strong></td>
</tr>
<tr class="odd">
<td>Fix keyboard layout mapping for AZERTY keyboards</td>
</tr>
<tr class="even">
<td>Add escape to Keyboard layouts mapping</td>
</tr>
<tr class="odd">
<td><strong>MSC/CDC/MTP Class</strong></td>
</tr>
<tr class="even">
<td>Allow re-activating host IN channel based on SOF timer to reduce NAK IT with some USB peripherals</td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="collapse">
<input type="checkbox" id="collapse-section19" aria-hidden="true"> <label for="collapse-section19" aria-hidden="true">V3.5.2 / 11-December-2023</label>
<div>
<h2>
Main Changes
</h2>
<table>
<thead>
<tr class="header">
<th>Headline</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td><strong>Core</strong></td>
</tr>
<tr class="even">
<td>Avoid infinite loop in case device descriptor length was wrongly set to zero</td>
</tr>
<tr class="odd">
<td><strong>MSC Class</strong></td>
</tr>
<tr class="even">
<td>Add support of multi-LUN storage devices</td>
</tr>
<tr class="odd">
<td>Report error for non-ready media</td>
</tr>
<tr class="even">
<td><strong>Audio Class</strong></td>
</tr>
<tr class="odd">
<td>Report error for unsupported audio sample rate</td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="collapse">
<input type="checkbox" id="collapse-section18" aria-hidden="true"> <label for="collapse-section18" aria-hidden="true">V3.5.1 / 10-January-2023</label>
<div>
<h2>
Main Changes
</h2>
<table>
<thead>
<tr class="header">
<th>Headline</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td><strong>Core</strong></td>
</tr>
<tr class="even">
<td>Ensure the number of endpoints parsed does not exceed defined USBH_MAX_NUM_ENDPOINTS</td>
</tr>
<tr class="odd">
<td>Use correct endpoint length for audio midi subclass devices</td>
</tr>
<tr class="even">
<td><strong>HID Class</strong></td>
</tr>
<tr class="odd">
<td>Prevent buffer overflow during HID get descriptors</td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="collapse">
<input type="checkbox" id="collapse-section17" aria-hidden="true"> <label for="collapse-section17" aria-hidden="true">V3.5.0 / 05-August-2022</label>
<div>
<h2>
Main Changes
</h2>
<table>
<thead>
<tr class="header">
<th>Headline</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td><strong>Core</strong></td>
</tr>
<tr class="even">
<td>Fix potential corruption of Endpoints MaxPacketSize</td>
</tr>
<tr class="odd">
<td><strong>HID Class</strong></td>
</tr>
<tr class="even">
<td>Fix potential buffer overflow</td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="collapse">
<input type="checkbox" id="collapse-section16" aria-hidden="true"> <label for="collapse-section16" aria-hidden="true">V3.4.1 / 04-April-2022</label>
<div>
<h2>
Main Changes
</h2>
<table>
<thead>
<tr class="header">
<th>Headline</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td>Update the way to declare Legal terms</td>
</tr>
<tr class="even">
<td>Fix code spelling and improve code style</td>
</tr>
<tr class="odd">
<td><strong>HID Class</strong></td>
</tr>
<tr class="even">
<td>Modify some variables names to avoid duplication versus device for HID class</td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="collapse">
<input type="checkbox" id="collapse-section15" aria-hidden="true"> <label for="collapse-section15" aria-hidden="true">V3.4.0 / 23-April-2021</label>
<div>
<h2>
Main Changes
</h2>
<table>
<thead>
<tr class="header">
<th>Headline</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td><strong>Core driver:</strong></td>
</tr>
<tr class="even">
<td>Fixes added to free RTOS resource during USB host DeInit</td>
</tr>
<tr class="odd">
<td>CodeSpell and mcuAstyle fixes</td>
</tr>
<tr class="even">
<td>Multiple MisraC 2012 fixes</td>
</tr>
<tr class="odd">
<td><strong>All Classes:</strong></td>
</tr>
<tr class="even">
<td>CodeSpell and mcuAstyle fixes</td>
</tr>
<tr class="odd">
<td>Multiple MisraC 2012 fixes</td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="collapse">
<input type="checkbox" id="collapse-section14" aria-hidden="true"> <label for="collapse-section14" aria-hidden="true">V3.3.5 / 26-January-2021</label>
<div>
<h2>
Main Changes
</h2>
<table>
<thead>
<tr class="header">
<th>Headline</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td><strong>Core driver:</strong></td>
</tr>
<tr class="even">
<td>Improve enumeration phase by adding some specifications requirements checks.</td>
</tr>
<tr class="odd">
<td>Add error signaling for some out of specification device’s descriptors fields.</td>
</tr>
<tr class="even">
<td><strong>MSC Class:</strong></td>
</tr>
<tr class="odd">
<td>usbh_msc.c: add checking on both IN and OUT pipes construction.</td>
</tr>
<tr class="even">
<td><strong>HID Class:</strong></td>
</tr>
<tr class="odd">
<td>Fix wrong keyboard key defines.</td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="collapse">
<input type="checkbox" id="collapse-section13" aria-hidden="true"> <label for="collapse-section13" aria-hidden="true">V3.3.4 / 08-January-2020</label>
<div>
<h2>
Main Changes
</h2>
<table>
<thead>
<tr class="header">
<th>Headline</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td><strong>Core driver:</strong></td>
</tr>
<tr class="even">
<td>Improve enumeration phase and avoid silent responses.</td>
</tr>
<tr class="odd">
<td>Add device reset trial mechanism during enumeration phase.</td>
</tr>
<tr class="even">
<td><strong>MSC Class:</strong></td>
</tr>
<tr class="odd">
<td>usbh_msc.c: update max_lun field to be uint8_t instead of uint32_t.</td>
</tr>
<tr class="even">
<td><strong>HID Class:</strong></td>
</tr>
<tr class="odd">
<td>Get HID descriptor by parsing the device descriptor in order to improve interoperability with buggy devices that Stall host Get HID descriptor request.</td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="collapse">
<input type="checkbox" id="collapse-section12" aria-hidden="true"> <label for="collapse-section12" aria-hidden="true">V3.3.3 / 29-April-2019</label>
<div>
<h2>
Main Changes
</h2>
<table>
<thead>
<tr class="header">
<th>Headline</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td>Fix misra-C 2012 high severity violations</td>
</tr>
<tr class="even">
<td><strong>Core driver:</strong></td>
</tr>
<tr class="odd">
<td>usbh_core.c: Rework USB host Core process in order to improve Device connection / disconnection robustness</td>
</tr>
<tr class="even">
<td><strong>MSC Class:</strong></td>
</tr>
<tr class="odd">
<td>usbh_msc.c: Update USBH_MSC_GetMaxLUN() to prevent corruption of supported LUNs</td>
</tr>
<tr class="even">
<td><strong>HID Class:</strong></td>
</tr>
<tr class="odd">
<td>Prevent race between USB buffer and Application fifo buffer, this was ensured by allocating a dedicated buffer for received report</td>
</tr>
<tr class="even">
<td>Prevent overflow on USB buffer for devices that could have report size greater than 4bytes</td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="collapse">
<input type="checkbox" id="collapse-section11" aria-hidden="true"> <label for="collapse-section11" aria-hidden="true">V3.3.2 / 24-January-2019</label>
<div>
<h2>
Main Changes
</h2>
<table>
<thead>
<tr class="header">
<th>Headline</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td><strong>Core driver:</strong></td>
</tr>
<tr class="even">
<td>usbh_core.c: fix on USBH_Deinit() API, prevent freeing pActiveClass->pData pointer during host Deinit, this is managed by the Class drivers.</td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="collapse">
<input type="checkbox" id="collapse-section10" aria-hidden="true"> <label for="collapse-section10" aria-hidden="true">V3.3.1 / 09-July-2018</label>
<div>
<h2>
Main Changes
</h2>
<table>
<thead>
<tr class="header">
<th>Headline</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td>Fix interoperability issue with HP mouse</td>
</tr>
<tr class="even">
<td>Add compatibility with FreeRTOS CMSIS V2 API changes</td>
</tr>
<tr class="odd">
<td>Update Legal terms section and add link to get copy of ST Ultimate Liberty SLA0044</td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="collapse">
<input type="checkbox" id="collapse-section9" aria-hidden="true"> <label for="collapse-section9" aria-hidden="true">V3.3.0 / 23-January-2018</label>
<div>
<h2>
Main Changes
</h2>
<table>
<thead>
<tr class="header">
<th>Headline</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td>Update Legal terms section to Ultimate Liberty</td>
</tr>
<tr class="even">
<td>Update some functions to be MISRA-C 2004 compliant</td>
</tr>
<tr class="odd">
<td>Improve USB Core enumeration state machine</td>
</tr>
<tr class="even">
<td>Fix Device fast plug/unplug issue</td>
</tr>
<tr class="odd">
<td>Improve interoperability with non compliant USB devices</td>
</tr>
<tr class="even">
<td>Add support of Host set remote wakeup enable feature</td>
</tr>
<tr class="odd">
<td>Fix USB Host MSC set correct sector size</td>
</tr>
<tr class="even">
<td>MSC: Set correct LUN number if returned LUN number exceeds max supported value</td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="collapse">
<input type="checkbox" id="collapse-section8" aria-hidden="true"> <label for="collapse-section8" aria-hidden="true">V3.2.2 / 07-July-2015</label>
<div>
<h2>
Main Changes
</h2>
<table>
<thead>
<tr class="header">
<th>Headline</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td><strong>MSC Class:</strong></td>
</tr>
<tr class="even">
<td>usbh_msc.c: Fix MSC Get Ready Delay issue</td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="collapse">
<input type="checkbox" id="collapse-section7" aria-hidden="true"> <label for="collapse-section7" aria-hidden="true">V3.2.1 / 26-June-2015</label>
<div>
<h2>
Main Changes
</h2>
<table>
<thead>
<tr class="header">
<th>Headline</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td><strong>Core driver:</strong></td>
</tr>
<tr class="even">
<td>usbh_def.h: update USBH_MAX_PIPES_NBR literal definition to be conditioned by #ifndef directive, to allow application code to change its value (i.e. in the compiler preprocessor)</td>
</tr>
<tr class="odd">
<td><strong>MSC Class:</strong></td>
</tr>
<tr class="even">
<td>usbh_msc.c:</td>
</tr>
<tr class="odd">
<td>Update USBH_MSC_GetMaxLUN() to return the correct number of supported LUNs (was returning 0xFF)</td>
</tr>
<tr class="even">
<td>Fix timeout calculation issue</td>
</tr>
<tr class="odd">
<td>usbh_msc.h:</td>
</tr>
<tr class="even">
<td>update MAX_SUPPORTED_LUN literal definition to be conditioned by #ifndef directive, to allow application code to change its value (i.e. in the compiler preprocessor)</td>
</tr>
<tr class="odd">
<td><strong>HID Class:</strong></td>
</tr>
<tr class="even">
<td>usbh_hid.h: fix HID’s handle “Timer” type to uint32_t instead of uint16_t</td>
</tr>
<tr class="odd">
<td><strong>MTP Class:</strong></td>
</tr>
<tr class="even">
<td>usbh_mtp.c: Fix timeout calculation issue</td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="collapse">
<input type="checkbox" id="collapse-section6" aria-hidden="true"> <label for="collapse-section6" aria-hidden="true">V3.2.0 / 04-November-2014</label>
<div>
<h2>
Main Changes
</h2>
<table>
<thead>
<tr class="header">
<th>Headline</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td>Update all drivers to be C++ compliant</td>
</tr>
<tr class="even">
<td>Miscellaneous source code comments update</td>
</tr>
<tr class="odd">
<td><strong>Core driver</strong></td>
</tr>
<tr class="even">
<td>usbh_core.c: remove HOST_IDLE state in USBH_LL_Connect() function</td>
</tr>
<tr class="odd">
<td><strong>MSC class</strong></td>
</tr>
<tr class="even">
<td>Update to manage correctly older USB Keys that do not support GetMaxLun request</td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="collapse">
<input type="checkbox" id="collapse-section5" aria-hidden="true"> <label for="collapse-section5" aria-hidden="true">V3.1.0 / 19-June-2014</label>
<div>
<h2>
Main Changes
</h2>
<table>
<thead>
<tr class="header">
<th>Headline</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td><strong>Core driver</strong></td>
</tr>
<tr class="even">
<td>Add a new define USBH_PROCESS_STACK_SIZE in the usbh_conf.h file to change the default internal USB host process stack. Note that by omitting this define, the default stack size (2KB) is used</td>
</tr>
<tr class="odd">
<td>Add a user callback to handle unrecoverable error case in the application</td>
</tr>
<tr class="even">
<td>Remove the wrong check on the interface descriptor index in the USBH_FindInterface() function</td>
</tr>
<tr class="odd">
<td><strong>All classes</strong></td>
</tr>
<tr class="even">
<td>Update class description in files comment by adding reference to the used USB class specification revision</td>
</tr>
<tr class="odd">
<td><strong>Audio, CDC and MTP classes</strong></td>
</tr>
<tr class="even">
<td>Add full RTOS support by handling state transitions through OS messages</td>
</tr>
<tr class="odd">
<td><strong>HID class</strong></td>
</tr>
<tr class="even">
<td>Add new API USBH_HID_GetPollInterval() to allow user to retrieve the needed poll time (interval between two USBD_HID_SendReport())</td>
</tr>
<tr class="odd">
<td><strong>Audio class</strong></td>
</tr>
<tr class="even">
<td>Add a new weak callback USBH_AUDIO_BufferEmptyCallback() to indicate the end of audio data processing on the user buffer</td>
</tr>
<tr class="odd">
<td><strong>MSC class</strong></td>
</tr>
<tr class="even">
<td>Return mass storage device capacity in Bytes in the user log message instead of MBytes</td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="collapse">
<input type="checkbox" id="collapse-section4" aria-hidden="true"> <label for="collapse-section4" aria-hidden="true">V3.0.0 / 18-February-2014</label>
<div>
<h2>
Main Changes
</h2>
<table>
<thead>
<tr class="header">
<th>Headline</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td>Major update based on STM32Cube specification: Library Core, Classes architecture and APIs modified vs. V2.1.0, and thus the 2 versions are not compatible.</td>
</tr>
<tr class="even">
<td><strong>This version has to be used only with STM32Cube based development</strong></td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="collapse">
<input type="checkbox" id="collapse-section3" aria-hidden="true"> <label for="collapse-section3" aria-hidden="true">V2.1.0 / 19-March-2012</label>
<div>
<h2>
Main Changes
</h2>
<table>
<thead>
<tr class="header">
<th>Headline</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td>Official support of STM32F4xx devices</td>
</tr>
<tr class="even">
<td>All source files: Legal terms disclaimer text update and add link to the Legal terms file on ST Internet</td>
</tr>
<tr class="odd">
<td>Add ISR structure to link the low level driver to the Host library</td>
</tr>
<tr class="even">
<td>Change length parameter in the I/O operations to handle large amount of data</td>
</tr>
<tr class="odd">
<td>Enhance the configuration descriptor parsing method to take into account multi interface devices</td>
</tr>
<tr class="even">
<td>Miscellaneous bug fix</td>
</tr>
<tr class="odd">
<td><strong>HID class</strong></td>
</tr>
<tr class="even">
<td>Remove blocking even frame synchronization loop</td>
</tr>
<tr class="odd">
<td><strong>MSC class</strong></td>
</tr>
<tr class="even">
<td>Handle correctly the BOT transfer with length < max length</td>
</tr>
<tr class="odd">
<td>Handle multi sector length data in the FAT FS interface</td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="collapse">
<input type="checkbox" id="collapse-section2" aria-hidden="true"> <label for="collapse-section2" aria-hidden="true">V2.0.0 / 22-July-2011</label>
<div>
<h2>
Main Changes
</h2>
<table>
<thead>
<tr class="header">
<th>Headline</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td>Second official version supporting STM32F105/7 and STM32F2xx devices</td>
</tr>
<tr class="even">
<td>Add support for <strong>STM32F2xx</strong> devices</td>
</tr>
<tr class="odd">
<td>Add multi interface feature</td>
</tr>
<tr class="even">
<td>Add dynamic configuration parsing</td>
</tr>
<tr class="odd">
<td>Add USBH_DeAllocate_AllChannel function in the Host channel management layer to clean up channels allocation table when de-initializing the library</td>
</tr>
<tr class="even">
<td>Change the core layer to stop correctly the host core and free all allocated channels</td>
</tr>
<tr class="odd">
<td>Add usbh_conf.h file in the application layer to customize some user parameters</td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="collapse">
<input type="checkbox" id="collapse-section1" aria-hidden="true"> <label for="collapse-section1" aria-hidden="true">V1.0.0 / 29-November-2010</label>
<div>
<h2>
Main Changes
</h2>
<table>
<thead>
<tr class="header">
<th>Headline</th>
</tr>
</thead>
<tbody>
<tr class="odd">
<td>Created</td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
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