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<title>Chapter 5 - USBX Host Classes API</title>
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</head>
<body class="article">
<div id="header">
<h1>Chapter 5 - USBX Host Classes API</h1>
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p>This chapter covers all the exposed APIs of the USBX host classes. The
following APIs for each class are described in detail.</p>
</div>
<div class="ulist">
<ul>
<li>
<p>HID class</p>
</li>
<li>
<p>CDC-ACM class</p>
</li>
<li>
<p>CDC-ECM class</p>
</li>
<li>
<p>Storage class</p>
</li>
</ul>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_ux_host_class_hid_client_register">ux_host_class_hid_client_register</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Register a HID client to the HID class.</p>
</div>
<div class="sect2">
<h3 id="_prototype">Prototype</h3>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-c" data-lang="c">UINT ux_host_class_hid_client_register(
UCHAR *hid_client_name,
UINT (*hid_client_handler)
(struct UX_HOST_CLASS_HID_CLIENT_COMMAND_STRUCT *));</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_description">Description</h3>
<div class="paragraph">
<p>This function is used to register a HID client to the HID class and returns immediately. The HID class needs to find a match between a HID device and HID client before requesting data from this device.</p>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<div class="title">Note</div>
</td>
<td class="content">
The C string of hid_client_name must be NULL-terminated and the length of it (without the NULL-terminator itself) must be no larger than <strong>UX_HOST_CLASS_HID_MAX_CLIENT_NAME_LENGTH</strong>.
</td>
</tr>
</table>
</div>
</div>
<div class="sect2">
<h3 id="_parameters">Parameters</h3>
<div class="ulist">
<ul>
<li>
<p><strong>hid_client_name</strong> Pointer to the HID client name.</p>
</li>
<li>
<p><strong>hid_client_handler</strong> Pointer to the HID client handler.</p>
</li>
</ul>
</div>
</div>
<div class="sect2">
<h3 id="_return_values">Return Values</h3>
<div class="ulist">
<ul>
<li>
<p><strong>UX_SUCCESS</strong> (0x00) The data transfer was completed</p>
</li>
<li>
<p><strong>UX_MEMORY_INSUFFICIENT</strong> (0x12) Memory allocation for client failed.</p>
</li>
<li>
<p><strong>UX_MEMORY_ARRAY_FULL</strong> (0x1a) Max clients already registered.</p>
</li>
<li>
<p><strong>UX_HOST_CLASS_ALREADY_INSTALLED</strong> (0x58) This class already exists</p>
</li>
</ul>
</div>
</div>
<div class="sect2">
<h3 id="_example">Example</h3>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-c" data-lang="c">UINT status;
/* The following example illustrates how to register a HID client, in
this case a USB mouse, to the HID class. */
status = ux_host_class_hid_client_register("ux_host_class_hid_client_mouse",
ux_host_class_hid_mouse_entry);
/* If status equals UX_SUCCESS, the operation was successful. */</code></pre>
</div>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_ux_host_class_hid_report_callback_register">ux_host_class_hid_report_callback_register</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Register a callback from the HID class.</p>
</div>
<div class="sect2">
<h3 id="_prototype_2">Prototype</h3>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-c" data-lang="c">UINT ux_host_class_hid_report_callback_register(
UX_HOST_CLASS_HID *hid,
UX_HOST_CLASS_HID_REPORT_CALLBACK *call_back);</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_description_2">Description</h3>
<div class="paragraph">
<p>This function is used to register a callback from the HID class to the HID client when a report is received and returns immediately.</p>
</div>
</div>
<div class="sect2">
<h3 id="_parameters_2">Parameters</h3>
<div class="ulist">
<ul>
<li>
<p><strong>hid</strong> Pointer to the HID class instance</p>
</li>
<li>
<p><strong>call_back</strong> Pointer to the call_back structure</p>
</li>
</ul>
</div>
</div>
<div class="sect2">
<h3 id="_return_values_2">Return values</h3>
<div class="ulist">
<ul>
<li>
<p><strong>UX_SUCCESS</strong> (0x00) The data transfer was completed</p>
</li>
<li>
<p><strong>UX_HOST_CLASS_INSTANCE_UNKNOWN</strong> (0x5b) Invalid HID instance.</p>
</li>
<li>
<p><strong>UX_HOST_CLASS_HID_REPORT_ERROR</strong> (0x79) Error in the report callback registration.</p>
</li>
</ul>
</div>
</div>
<div class="sect2">
<h3 id="_example_2">Example</h3>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-c" data-lang="c">UINT status;
/* This example illustrates how to register a HID client, in this case a USB mouse, to the HID class. In this case, the HID client is asking the HID class to call the client for each usage received in the HID report. */
call_back.ux_host_class_hid_report_callback_id = 0;
call_back.ux_host_class_hid_report_callback_function = ux_host_class_hid_mouse_callback;
call_back.ux_host_class_hid_report_callback_buffer = UX_NULL;
call_back.ux_host_class_hid_report_callback_flags = UX_HOST_CLASS_HID_REPORT_INDIVIDUAL_USAGE;
call_back.ux_host_class_hid_report_callback_length = 0;
status = ux_host_class_hid_report_callback_register(hid, &call_back);
/* If status equals UX_SUCCESS, the operation was successful. */</code></pre>
</div>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_ux_host_class_hid_periodic_report_start">ux_host_class_hid_periodic_report_start</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Start the periodic endpoint for a HID class instance.</p>
</div>
<div class="sect2">
<h3 id="_prototype_3">Prototype</h3>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-c" data-lang="c">UINT ux_host_class_hid_periodic_report_start(UX_HOST_CLASS_HID *hid);</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_description_3">Description</h3>
<div class="paragraph">
<p>This function is used to start the periodic (interrupt) endpoint for the instance of the HID class that is bound to this HID client. The HID class cannot start the periodic endpoint until the HID client is activated and therefore it is left to the HID client to start this endpoint to receive reports.</p>
</div>
<div class="paragraph">
<p>To protect states for reentry, it waits the semaphore of HID instance before modifying periodic report polling state.</p>
</div>
</div>
<div class="sect2">
<h3 id="_input_parameter">Input Parameter</h3>
<div class="ulist">
<ul>
<li>
<p><strong>hid</strong> Pointer to the HID class instance.</p>
</li>
</ul>
</div>
</div>
<div class="sect2">
<h3 id="_return_values_3">Return Values</h3>
<div class="ulist">
<ul>
<li>
<p><strong>UX_SUCCESS</strong> (0x00) Periodic reporting successfully started.</p>
</li>
<li>
<p><strong>ux_host_class_hid_PERIODIC_REPORT_ERROR</strong> (0x7A) Error in the periodic report.</p>
</li>
<li>
<p><strong>UX_HOST_CLASS_INSTANCE_UNKNOWN</strong> (0x5b) HID class instance does not exist.</p>
</li>
</ul>
</div>
</div>
<div class="sect2">
<h3 id="_example_3">Example</h3>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-c" data-lang="c">UINT status;
/* The following example illustrates how to start the periodic
endpoint. */
status = ux_host_class_hid_periodic_report_start(hid);
/* If status equals UX_SUCCESS, the operation was successful. */</code></pre>
</div>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_ux_host_class_hid_periodic_report_stop">ux_host_class_hid_periodic_report_stop</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Stop the periodic endpoint for a HID class instance.</p>
</div>
<div class="sect2">
<h3 id="_prototype_4">Prototype</h3>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-c" data-lang="c">UINT ux_host_class_hid_periodic_report_stop(UX_HOST_CLASS_HID *hid);</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_description_4">Description</h3>
<div class="paragraph">
<p>This function is used to stop the periodic (interrupt) endpoint for the instance of the HID class that is bound to this HID client. The HID class cannot stop the periodic endpoint until the HID client is deactivated, all its resources freed and therefore it is left to the HID client to stop this endpoint.</p>
</div>
<div class="paragraph">
<p>To protect states for reentry, it waits the semaphore of HID instance before modifying periodic report polling state.</p>
</div>
</div>
<div class="sect2">
<h3 id="_input_parameter_2">Input Parameter</h3>
<div class="ulist">
<ul>
<li>
<p><strong>hid</strong> Pointer to the HID class instance.</p>
</li>
</ul>
</div>
</div>
<div class="sect2">
<h3 id="_return_values_4">Return Values</h3>
<div class="ulist">
<ul>
<li>
<p><strong>UX_SUCCESS</strong> (0x00) Periodic reporting successfully stopped.</p>
</li>
<li>
<p><strong>ux_host_class_hid_PERIODIC_REPORT_ERROR</strong> (0x7A) Error in the periodic report.</p>
</li>
<li>
<p><strong>UX_HOST_CLASS_INSTANCE_UNKNOWN</strong> (0x5b) HID class instance does not exist</p>
</li>
</ul>
</div>
</div>
<div class="sect2">
<h3 id="_example_4">Example</h3>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-c" data-lang="c">UINT status;
/* The following example illustrates how to stop the periodic endpoint. */
status = ux_host_class_hid_periodic_report_stop(hid);
/* If status equals UX_SUCCESS, the operation was successful. */</code></pre>
</div>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_ux_host_class_hid_idle_get">ux_host_class_hid_idle_get</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Get a report idle rate from a HID class instance</p>
</div>
<div class="sect2">
<h3 id="_prototype_5">Prototype</h3>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-c" data-lang="c">UINT ux_host_class_hid_idle_get(UX_HOST_CLASS_HID *hid,
USHORT *idle_time, USHORT report_id)</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_description_5">Description</h3>
<div class="paragraph">
<p>This function is used to get idle rate time period used by device to keep sending reports when there is no data.</p>
</div>
<div class="paragraph">
<p>To protect states for reentry, it waits the semaphore of HID instance and the semaphore of device default control endpoint before issuing the transfer request.</p>
</div>
</div>
<div class="sect2">
<h3 id="_parameters_3">Parameters</h3>
<div class="ulist">
<ul>
<li>
<p><strong>hid</strong> Pointer to the HID class instance.</p>
</li>
<li>
<p><strong>idle_time</strong> Pointer to the buffer to hold idle rate time period between reports.</p>
</li>
<li>
<p><strong>report_id</strong> Report ID.</p>
</li>
</ul>
</div>
</div>
<div class="sect2">
<h3 id="_return_values_5">Return Values</h3>
<div class="ulist">
<ul>
<li>
<p><strong>UX_SUCCESS</strong> (0x00) The data transfer was completed.</p>
</li>
<li>
<p><strong>UX_FUNCTION_NOT_SUPPORTED</strong> (0x54) Function not supported.</p>
</li>
<li>
<p><strong>UX_HOST_CLASS_INSTANCE_UNKNOWN</strong> (0x5b) HID class instance does not exist.</p>
</li>
<li>
<p><strong>UX_TRANSFER_STALLED</strong> (0x21) Request is not accepted by device, there is no idle rate control and reports are only sent when there is data.</p>
</li>
</ul>
</div>
</div>
<div class="sect2">
<h3 id="_example_5">Example</h3>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-c" data-lang="c">USHORT idle_time;
UINT status;
/* The following example illustrates how to get idle rate. */
status = ux_host_class_hid_idle_get(hid, &idle_time, 0);
/* If status equals UX_SUCCESS, the operation was successful. */</code></pre>
</div>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_ux_host_class_hid_idle_set">ux_host_class_hid_idle_set</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Send idle rate</p>
</div>
<div class="sect2">
<h3 id="_prototype_6">Prototype</h3>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-c" data-lang="c">UINT ux_host_class_hid_idle_set(UX_HOST_CLASS_HID *hid,
USHORT idle_time, USHORT report_id)</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_description_6">Description</h3>
<div class="paragraph">
<p>This function is used to set idle rate time period to the device.</p>
</div>
<div class="paragraph">
<p>To protect states for reentry, it waits the semaphore of HID instance and the semaphore of device default control endpoint before issuing the transfer request.</p>
</div>
</div>
<div class="sect2">
<h3 id="_parameters_4">Parameters</h3>
<div class="ulist">
<ul>
<li>
<p><strong>hid</strong> Pointer to the HID class instance.</p>
</li>
<li>
<p><strong>idle_time</strong> Idle rate time period to set.</p>
</li>
<li>
<p><strong>report_id</strong> Report ID.</p>
</li>
</ul>
</div>
</div>
<div class="sect2">
<h3 id="_return_values_6">Return Values</h3>
<div class="ulist">
<ul>
<li>
<p><strong>UX_SUCCESS</strong> (0x00) The data transfer was completed.</p>
</li>
<li>
<p><strong>UX_FUNCTION_NOT_SUPPORTED</strong> (0x54) Function not supported.</p>
</li>
<li>
<p><strong>UX_HOST_CLASS_HID_REPORT_ERROR</strong> (0x70) Error in the periodic report.</p>
</li>
<li>
<p><strong>UX_HOST_CLASS_INSTANCE_UNKNOWN</strong> (0x5b) HID class instance does not exist.</p>
</li>
<li>
<p><strong>UX_TRANSFER_STALLED</strong> (0x21) Request is not accepted by device, there is no idle rate control and reports are only sent when there is data.</p>
</li>
</ul>
</div>
</div>
<div class="sect2">
<h3 id="_example_6">Example</h3>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-c" data-lang="c">/* The following example illustrates how to set idle rate. */
status = ux_host_class_hid_idle_set(hid, 50, 0);
/* If status equals UX_SUCCESS, the operation was successful. */</code></pre>
</div>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_ux_host_class_hid_report_get">ux_host_class_hid_report_get</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Get a report from a HID class instance.</p>
</div>
<div class="sect2">
<h3 id="_prototype_7">Prototype</h3>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-c" data-lang="c">UINT ux_host_class_hid_report_get(
UX_HOST_CLASS_HID *hid,
UX_HOST_CLASS_HID_CLIENT_REPORT *client_report);</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_description_7">Description</h3>
<div class="paragraph">
<p>This function is used to receive a report directly from the device without relying on the periodic endpoint. This report is coming from the control endpoint but its treatment is the same as though it were coming on the periodic endpoint.</p>
</div>
<div class="paragraph">
<p>To protect states for reentry, it waits the semaphore of HID instance and the semaphore of device default control endpoint before issuing the transfer request.</p>
</div>
</div>
<div class="sect2">
<h3 id="_parameters_5">Parameters</h3>
<div class="ulist">
<ul>
<li>
<p><strong>hid</strong> Pointer to the HID class instance.</p>
</li>
<li>
<p><strong>client_report</strong> Pointer to the HID client report.</p>
</li>
</ul>
</div>
</div>
<div class="sect2">
<h3 id="_return_values_7">Return Values</h3>
<div class="ulist">
<ul>
<li>
<p><strong>UX_SUCCESS</strong> (0x00) The report was successfully received.</p>
</li>
<li>
<p><strong>UX_HOST_CLASS_HID_REPORT_ERROR</strong> (0x70) Either client report was invalid or error during transfer.</p>
</li>
<li>
<p><strong>UX_HOST_CLASS_INSTANCE_UNKNOWN</strong> (0x5b) HID class instance does not exist.</p>
</li>
<li>
<p><strong>UX_BUFFER_OVERFLOW</strong> (0x5d) The buffer supplied is not big enough to accommodate the uncompressed report.</p>
</li>
</ul>
</div>
</div>
<div class="sect2">
<h3 id="_example_7">Example</h3>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-c" data-lang="c">UX_HOST_CLASS_HID_CLIENT_REPORT input_report;
UINT status;
/* The following example illustrates how to get a report. */
input_report.ux_host_class_hid_client_report = hid_report;
input_report.ux_host_class_hid_client_report_buffer = buffer;
input_report.ux_host_class_hid_client_report_length = length;
input_report.ux_host_class_hid_client_flags = UX_HOST_CLASS_HID_REPORT_INDIVIDUAL_USAGE;
status = ux_host_class_hid_report_get(hid, &input_report);
/* If status equals UX_SUCCESS, the operation was successful. */</code></pre>
</div>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_ux_host_class_hid_report_set">ux_host_class_hid_report_set</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Send a report</p>
</div>
<div class="sect2">
<h3 id="_prototype_8">Prototype</h3>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-c" data-lang="c">UINT ux_host_class_hid_report_set(