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<title>Chapter 4 - Description of USBX Host Services</title>
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</head>
<body class="article">
<div id="header">
<h1>Chapter 4 - Description of USBX Host Services</h1>
</div>
<div id="content">
<div class="sect1">
<h2 id="_ux_host_stack_initialize">ux_host_stack_initialize</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Initialize USBX for host operation.</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_stack_initialize(
UINT (*system_change_function)
(ULONG, UX_HOST_CLASS *,VOID *));</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_description">Description</h3>
<div class="paragraph">
<p>This function will initialize the USB host stack and return immediately. The supplied memory area will be setup for USBX internal use. If UX_SUCCESS is returned, USBX is ready for host controller and class registration.</p>
</div>
</div>
<div class="sect2">
<h3 id="_input_parameter">Input Parameter</h3>
<div class="ulist">
<ul>
<li>
<p><em>system_change_function</em>: Pointer to optional callback routine for notifying application of instance changes.
The change callback function is as following:</p>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-c" data-lang="c">UINT demo_ux_system_host_change_function(ULONG change_code, UX_HOST_CLASS *ux_class, VOID *param);</code></pre>
</div>
</div>
<div class="paragraph">
<p>The possible changes notification parameters are:</p>
</div>
<table class="tableblock frame-all grid-all stretch">
<colgroup>
<col style="width: 25%;">
<col style="width: 25%;">
<col style="width: 25%;">
<col style="width: 25%;">
</colgroup>
<thead>
<tr>
<th class="tableblock halign-left valign-top">UX Change Code</th>
<th class="tableblock halign-left valign-top">Pointer to Class</th>
<th class="tableblock halign-left valign-top">Pointer to Instance</th>
<th class="tableblock halign-left valign-top">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">UX_DEVICE_INSERTION</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Class (<code>UX_HOST_CLASS*</code>)</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Instance</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Registered class created and activated a function instance</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">UX_DEVICE_REMOVAL</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Class (<code>UX_HOST_CLASS*</code>)</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Instance</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Function instance is deactivated</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">UX_HID_CLIENT_INSERTION</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Class (<code>UX_HOST_CLASS*</code>)</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">HID Client (<code>UX_HOST_CLASS_HID_CLIENT*</code>)</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">HID class client (keyboard, mouse, remote control …​) is activated</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">UX_HID_CLIENT_REMOVAL</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Class (<code>UX_HOST_CLASS*</code>)</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">HID Client (<code>UX_HOST_CLASS_HID_CLIENT*</code>)</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">HID class client is deactivated</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">UX_STORAGE_MEDIA_INSERTION</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Class (<code>UX_HOST_CLASS*</code>)</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Storage Media (<code>UX_HOST_CLASS_STORAGE_MEDIA*</code>)</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Storage media is ready (only available for No-FileX mode)</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">UX_STORAGE_MEDIA_REMOVAL</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Class (<code>UX_HOST_CLASS*</code>)</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Storage Media (<code>UX_HOST_CLASS_STORAGE_MEDIA*</code>)</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Storage media is removed (only available for No-FileX mode)</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">UX_DEVICE_CONNECTION</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Null (<code>UX_NULL</code>)</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Device (<code>UX_DEVICE*</code>)</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Device is connected</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">UX_DEVICE_DISCONNECTION</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Null (<code>UX_NULL</code>)</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Device (<code>UX_DEVICE*</code>)</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Device is disconnected</p></td>
</tr>
</tbody>
</table>
</li>
</ul>
</div>
</div>
<div class="sect2">
<h3 id="_return_value">Return Value</h3>
<div class="ulist">
<ul>
<li>
<p><strong>UX_SUCCESS</strong> (0x00) Successful initialization.</p>
</li>
<li>
<p><strong>UX_MEMORY_INSUFFICIENT</strong> (0x12) A memory allocation failed.</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;
/* Initialize USBX for host operation, without notification. */
status = ux_host_stack_initialize(UX_NULL);
/* If status equals UX_SUCCESS, USBX has been successfully initialized for host operation. */</code></pre>
</div>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_ux_host_stack_endpoint_transfer_abort">ux_host_stack_endpoint_transfer_abort</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Abort all transactions attached to a transfer request for an endpoint.</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_stack_endpoint_transfer_abort(UX_ENDPOINT *endpoint);</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_description_2">Description</h3>
<div class="paragraph">
<p>This function will cancel all transactions active or pending for a specific transfer request attached to an endpoint and return immediately. If the transfer request has a callback function attached, the callback function will be called with the UX_TRANSACTION_ABORTED status.</p>
</div>
</div>
<div class="sect2">
<h3 id="_input_parameter_2">Input Parameter</h3>
<div class="ulist">
<ul>
<li>
<p><em>endpoint</em>: Pointer to an endpoint.</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) No errors.</p>
</li>
<li>
<p><strong>UX_ENDPOINT_HANDLE_UNKNOWN</strong> (0x53) Endpoint handle is not valid.</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">UX_HOST_CLASS_PRINTER *printer;
UINT status;
/* Get the instance for this class. */
printer = (UX_HOST_CLASS_PRINTER *) command ->
ux_host_class_command_instance;
/* The printer is being shut down. */
printer -> printer_state = UX_HOST_CLASS_INSTANCE_SHUTDOWN;
/* We need to abort transactions on the bulk out pipe. */
status = ux_host_stack_endpoint_transfer_abort
(printer -> printer_bulk_out_endpoint);
/* If status equals UX_SUCCESS, the operation was successful */</code></pre>
</div>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_ux_host_stack_class_get">ux_host_stack_class_get</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Get the pointer to a class container.</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_stack_class_get(
UCHAR *class_name,
UX_HOST_CLASS **class);</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_description_3">Description</h3>
<div class="paragraph">
<p>This function returns a pointer to the class container immediately. A class needs to obtain its container from the USB stack to search for instances when a class or an application wants to open a 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 class_name must be NULL-terminated and the length of it (without the NULL-terminator itself) must be no larger than UX_MAX_CLASS_NAME_LENGTH.
</td>
</tr>
</table>
</div>
</div>
<div class="sect2">
<h3 id="_parameters">Parameters</h3>
<div class="ulist">
<ul>
<li>
<p><em>class_name</em>: Pointer to the class name.</p>
</li>
<li>
<p><em>class</em>: A pointer updated by the function call that contains the class container for the name of the class.</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) No errors, on return the class field is filed with the pointer to the class container.</p>
</li>
<li>
<p><strong>UX_HOST_CLASS_UNKNOWN</strong> (0x59) Class is unknown by the stack.</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">UX_HOST_CLASS *printer_container;
UINT status;
/* Get the container for this class. */
status = ux_host_stack_class_get("ux_host_class_printer", &printer_container);
/* If status equals UX_SUCCESS, the operation was successful */</code></pre>
</div>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_ux_host_stack_class_register">ux_host_stack_class_register</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Register a USB class to the USB stack.</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_stack_class_register(
UCHAR *class_name,
UINT (*class_entry_address) (struct UX_HOST_CLASS_COMMAND_STRUCT *));</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_description_4">Description</h3>
<div class="paragraph">
<p>This function registers a USB class to the USB stack and returns immediately. The class must
specify an entry point for the USB stack to send commands such as the following.</p>
</div>
<div class="ulist">
<ul>
<li>
<p><strong>UX_HOST_CLASS_COMMAND_QUERY</strong></p>
</li>
<li>
<p><strong>UX_HOST_CLASS_COMMAND_ACTIVATE</strong></p>
</li>
<li>
<p><strong>UX_HOST_CLASS_COMMAND_DESTROY</strong></p>
</li>
</ul>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<div class="title">Note</div>
</td>
<td class="content">
The C string of <em>class_name</em> must be NULL-terminated and the length of it (without the NULL-terminator itself) must be no larger than <strong>UX_MAX_CLASS_NAME_LENGTH</strong>.
</td>
</tr>
</table>
</div>
</div>
<div class="sect2">
<h3 id="_parameters_2">Parameters</h3>
<div class="ulist">
<ul>
<li>
<p><em>class_name</em>: Pointer to the name of the class, valid entries are found in the file ux_system_initialize.c under the USB Classes of USBX.</p>
</li>
<li>
<p><em>class_entry_address</em>: Address of the entry function of the class.</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) Class installed successfully.</p>
</li>
<li>
<p><strong>UX_MEMORY_ARRAY_FULL</strong> (0x1a) No more memory to store this class.</p>
</li>
<li>
<p><strong>UX_HOST_CLASS_ALREADY_INSTALLED</strong> (0x58) Host class already installed.</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;
/* Register all the classes for this implementation. */
status = ux_host_stack_class_register("ux_host_class_hub", ux_host_class_hub_entry);
/* If status equals UX_SUCCESS, class was successfully installed. */</code></pre>
</div>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_ux_host_stack_class_instance_create">ux_host_stack_class_instance_create</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Create a new class instance for a class container.</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_stack_class_instance_create(
UX_HOST_CLASS *class,
VOID *class_instance);</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_description_5">Description</h3>
<div class="paragraph">
<p>This function creates a new class instance for a class container and returns immediately. The instance of a class is not contained in the class code to reduce the class complexity. Rather, each class instance is attached to the class container located in the main stack.</p>
</div>
</div>
<div class="sect2">
<h3 id="_parameters_3">Parameters</h3>
<div class="ulist">
<ul>
<li>
<p><em>class</em>: Pointer to the class container.</p>
</li>
<li>
<p><em>class_instance</em>: Pointer to the class instance to be created.</p>
</li>
</ul>
</div>
</div>
<div class="sect2">
<h3 id="_return_value_2">Return Value</h3>
<div class="ulist">
<ul>
<li>
<p><strong>UX_SUCCESS</strong> (0x00) The class instance was attached to the class container.</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">UINT status;
UX_HOST_CLASS_PRINTER *printer;
/* Obtain memory for this class instance. */
printer = ux_memory_allocate(UX_NO_ALIGN, sizeof(UX_HOST_CLASS_PRINTER));
if (printer == UX_NULL)
return(UX_MEMORY_INSUFFICIENT);
/* Store the class container into this instance. */
printer -> printer_class = command -> ux_host_class;
/* Create this class instance. */
status = ux_host_stack_class_instance_create(printer -> printer_class, (VOID *)printer);
/* If status equals UX_SUCCESS, the class instance was successfully created and attached to the class container. */</code></pre>
</div>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_ux_host_stack_class_instance_destroy">ux_host_stack_class_instance_destroy</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Destroy a class instance for a class container.</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_stack_class_instance_destroy(
UX_HOST_CLASS *class,
VOID *class_instance);</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_description_6">Description</h3>
<div class="paragraph">
<p>This function destroys a class instance for a class container and returns immediately.</p>
</div>
</div>
<div class="sect2">
<h3 id="_parameters_4">Parameters</h3>
<div class="ulist">
<ul>
<li>
<p><em>class</em>: Pointer to the class container.</p>
</li>
<li>
<p><em>class_instance</em>: Pointer to the instance to destroy.</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) The class instance was destroyed.</p>
</li>
<li>
<p><strong>UX_HOST_CLASS_INSTANCE_UNKNOWN</strong> (0x5b) The class instance is not attached to the class container.</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">UINT status;
UX_HOST_CLASS_PRINTER *printer;
/* Get the instance for this class. */
printer = (UX_HOST_CLASS_PRINTER *) command -> ux_host_class_command_instance;
/* The printer is being shut down. */
printer -> printer_state = UX_HOST_CLASS_INSTANCE_SHUTDOWN;
/* Destroy the instance. */
status = ux_host_stack_class_instance_destroy(printer -> printer_class, (VOID *) printer);
/* If status equals UX_SUCCESS, the class instance was successfully destroyed. */</code></pre>
</div>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_ux_host_stack_class_instance_get">ux_host_stack_class_instance_get</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Get a class instance pointer for a specific class.</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_stack_class_instance_get(
UX_HOST_CLASS *class,
UINT class_index,
VOID **class_instance);</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_description_7">Description</h3>
<div class="paragraph">
<p>This function returns a class instance pointer for a specific class immediately. The instance of a class is not contained in the class code to reduce the class complexity. Rather, each class instance is attached to the class container. This function is used to search for class instances within a class container.</p>
</div>
</div>
<div class="sect2">
<h3 id="_parameters_5">Parameters</h3>
<div class="ulist">
<ul>
<li>
<p><em>class</em>: Pointer to the class container.</p>
</li>
<li>
<p><em>class_index</em>: An index to be used by the function call within the list of attached classes to the container.</p>
</li>
<li>
<p><em>class_instance</em>: Pointer to the instance to be returned by the function call.</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 class instance was found.</p>