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<meta name="description" content="Learn about the USBX Device Services.">
<title>Description of USBX Device Services</title>
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</head>
<body class="article">
<div id="header">
<h1>Description of USBX Device Services</h1>
</div>
<div id="content">
<h3 id="_ux_device_stack_alternate_setting_get" class="discrete">ux_device_stack_alternate_setting_get</h3>
<div class="paragraph">
<p>Get current alternate setting for an interface value</p>
</div>
<h3 id="_prototype" class="discrete">Prototype</h3>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-c" data-lang="c">UINT ux_device_stack_alternate_setting_get(ULONG interface_value);</code></pre>
</div>
</div>
<h3 id="_description" class="discrete">Description</h3>
<div class="paragraph">
<p>This function is used by the USB host to obtain the current alternate setting for a specific interface value. It is called by the controller driver when a <strong>GET_INTERFACE</strong> request is received, to start data stage of the control transfer in background, and return immediately.</p>
</div>
<h3 id="_input_parameter" class="discrete">Input Parameter</h3>
<div class="ulist">
<ul>
<li>
<p><em>Interface_value</em>: Interface value for which the current alternate setting is queried</p>
</li>
</ul>
</div>
<h3 id="_return_values" class="discrete">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_ERROR</strong> (0xFF) Wrong interface value.</p>
</li>
</ul>
</div>
<h3 id="_example" class="discrete">Example</h3>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-c" data-lang="c">ULONG interface_value;
UINT status;
/* The following example illustrates this service. */
status = ux_device_stack_alternate_setting_get(interface_value);
/* If status equals UX_SUCCESS, the operation was successful. */</code></pre>
</div>
</div>
<h3 id="_ux_device_stack_alternate_setting_set" class="discrete">ux_device_stack_alternate_setting_set</h3>
<div class="paragraph">
<p>Set current alternate setting for an interface value</p>
</div>
<h3 id="_prototype_2" class="discrete">Prototype</h3>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-c" data-lang="c">UINT ux_device_stack_alternate_setting_set(
ULONG interface_value,
ULONG alternate_setting_value);</code></pre>
</div>
</div>
<h3 id="_description_2" class="discrete">Description</h3>
<div class="paragraph">
<p>This function is used by the USB host to set the current alternate setting for a specific interface value. It is called by the controller driver when a <strong>SET_INTERFACE</strong> request is received. When the <strong>SET_INTERFACE</strong> is completed, the values of the alternate settings are applied to the class.</p>
</div>
<div class="paragraph">
<p>The device stack will issue a <strong>UX_SLAVE_CLASS_COMMAND_CHANGE</strong> to the class that owns this interface to reflect the change of alternate setting.</p>
</div>
<div class="paragraph">
<p>The function starts status stage of the control transfer in background, and return immediately.</p>
</div>
<h3 id="_parameters" class="discrete">Parameters</h3>
<div class="ulist">
<ul>
<li>
<p><em>interface_value</em>: Interface value for which the current alternate setting is set.</p>
</li>
<li>
<p><em>alternate_setting_value</em>: The new alternate setting value.</p>
</li>
</ul>
</div>
<h3 id="_return_values_2" class="discrete">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_INTERFACE_HANDLE_UNKNOWN</strong> (0x52) No interface attached.</p>
</li>
<li>
<p><strong>UX_FUNCTION_NOT_SUPPORTED</strong> (0x54) Device is not configured.</p>
</li>
<li>
<p><strong>UX_ERROR</strong> (0xFF) Wrong interface value.</p>
</li>
</ul>
</div>
<h3 id="_example_2" class="discrete">Example</h3>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-c" data-lang="c">ULONG interface_value;
ULONG alternate_setting_value;
/* The following example illustrates this service. */
status = ux_device_stack_alternate_setting_set(interface_value, alternate_setting_value);
/* If status equals UX_SUCCESS, the operation was successful. */</code></pre>
</div>
</div>
<h3 id="_ux_device_stack_class_register" class="discrete">ux_device_stack_class_register</h3>
<div class="paragraph">
<p>Register a new USB device class</p>
</div>
<h3 id="_prototype_3" class="discrete">Prototype</h3>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-c" data-lang="c">UINT ux_device_stack_class_register(
UCHAR *class_name,
UINT (*class_entry_function)(struct UX_SLAVE_CLASS_COMMAND_STRUCT *),
ULONG configuration_number,
ULONG interface_number,
VOID *parameter);</code></pre>
</div>
</div>
<h3 id="_description_3" class="discrete">Description</h3>
<div class="paragraph">
<p>This function is used by the application to register a new USB device class. This registration starts a class container and not an instance of the class and returns immediately. A class should have an active thread and be attached to a specific interface.</p>
</div>
<div class="paragraph">
<p>Some classes expect a parameter or parameter list. For instance, the device storage class would expect the geometry of the storage device it is trying to emulate. The parameter field is therefore dependent on the class requirement and can be a value or a pointer to a structure filled with the class values.</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 <strong>UX_MAX_CLASS_NAME_LENGTH</strong>.
</td>
</tr>
</table>
</div>
<h3 id="_parameters_2" class="discrete">Parameters</h3>
<div class="ulist">
<ul>
<li>
<p><em>class_name</em>: Class Name</p>
</li>
<li>
<p><em>class_entry_function</em>: The entry function of the class.</p>
</li>
<li>
<p><em>configuration_number</em>: The configuration number this class is attached to.</p>
</li>
<li>
<p><em>interface_number</em>: The interface number this class is attached to.</p>
</li>
<li>
<p><em>parameter</em>: A pointer to a class specific parameter list.</p>
</li>
</ul>
</div>
<h3 id="_return_values_3" class="discrete">Return Values</h3>
<div class="ulist">
<ul>
<li>
<p><strong>UX_SUCCESS</strong> (0x00) The class was registered</p>
</li>
<li>
<p><strong>UX_MEMORY_INSUFFICIENT</strong> (0x12) No entries left in class table.</p>
</li>
<li>
<p><strong>UX_THREAD_ERROR</strong> (0x16) Cannot create a class thread.</p>
</li>
</ul>
</div>
<h3 id="_example_3" class="discrete">Example</h3>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-c" data-lang="c">UINT status;
/* The following example illustrates this service. */
/* Initialize the device storage class. The class is connected with interface 1 */
status = ux_device_stack_class_register(_ux_system_slave_class_storage_name ux_device_class_storage_entry,
1, 1, (VOID *)&parameter);</code></pre>
</div>
</div>
<h3 id="_ux_device_stack_class_unregister" class="discrete">ux_device_stack_class_unregister</h3>
<div class="paragraph">
<p>Unregister a USB device class</p>
</div>
<h3 id="_prototype_4" class="discrete">Prototype</h3>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-c" data-lang="c">UINT ux_device_stack_class_unregister(
UCHAR *class_name,
UINT (*class_entry_function)(struct UX_SLAVE_CLASS_COMMAND_STRUCT*));</code></pre>
</div>
</div>
<h3 id="_description_4" class="discrete">Description</h3>
<div class="paragraph">
<p>This function is used by the application to unregister a USB device class and returns immediately.</p>
</div>
<div class="paragraph">
<p>The device stack will issue a <strong>UX_SLAVE_CLASS_COMMAND_UNINITIALIZE</strong> to the class to uninitialized.</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 <strong>UX_MAX_CLASS_NAME_LENGTH</strong>.
</td>
</tr>
</table>
</div>
<h3 id="_parameters_3" class="discrete">Parameters</h3>
<div class="ulist">
<ul>
<li>
<p><em>class_name</em>: Class Name</p>
</li>
<li>
<p><em>class_entry_function</em>: The entry function of the class.</p>
</li>
</ul>
</div>
<h3 id="_return_values_4" class="discrete">Return Values</h3>
<div class="ulist">
<ul>
<li>
<p><strong>UX_SUCCESS</strong> (0x00) The class was unregistered.</p>
</li>
<li>
<p><strong>UX_NO_CLASS_MATCH</strong> (0x57) The class isn’t registered.</p>
</li>
</ul>
</div>
<h3 id="_example_4" class="discrete">Example</h3>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-c" data-lang="c">/* The following example illustrates this service. */
/* Unitialize the device storage class. */
status = ux_device_stack_class_unregister(_ux_system_slave_class_storage_name, ux_device_class_storage_entry);
/* If status equals UX_SUCCESS, the operation was successful. */</code></pre>
</div>
</div>
<h3 id="_ux_device_stack_configuration_get" class="discrete">ux_device_stack_configuration_get</h3>
<div class="paragraph">
<p>Get the current configuration</p>
</div>
<h3 id="_prototype_5" class="discrete">Prototype</h3>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-c" data-lang="c">UINT ux_device_stack_configuration_get(VOID);</code></pre>
</div>
</div>
<h3 id="_description_5" class="discrete">Description</h3>
<div class="paragraph">
<p>This function is used by the host to obtain the current configuration running in the device. It is called by the controller driver when a GET_CONFIGURATION request is received. It starts data stage of the control transfer in background, and returns immediately.</p>
</div>
<h3 id="_input_parameter_2" class="discrete">Input Parameter</h3>
<div class="paragraph">
<p>None</p>
</div>
<h3 id="_return_value" class="discrete">Return Value</h3>
<div class="ulist">
<ul>
<li>
<p><strong>UX_SUCCESS</strong> (0x00) The data transfer was completed.</p>
</li>
</ul>
</div>
<h3 id="_example_5" class="discrete">Example</h3>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-c" data-lang="c">UINT status;
/* The following example illustrates this service. */
status = ux_device_stack_configuration_get();
/* If status equals UX_SUCCESS, the operation was successful. */</code></pre>
</div>
</div>
<h3 id="_ux_device_stack_configuration_set" class="discrete">ux_device_stack_configuration_set</h3>
<div class="paragraph">
<p>Set the current configuration</p>
</div>
<h3 id="_prototype_6" class="discrete">Prototype</h3>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-c" data-lang="c">UINT ux_device_stack_configuration_set(ULONG configuration_value);</code></pre>
</div>
</div>
<h3 id="_description_6" class="discrete">Description</h3>
<div class="paragraph">
<p>This function is used by the host to set the current configuration running in the device. Upon reception of this command, the USB device stack will activate the alternate setting 0 of each interface connected to this configuration.</p>
</div>
<div class="paragraph">
<p>The function issues protocol error or starts status stage of the control transfer in background, and return immediately.</p>
</div>
<h3 id="_input_parameter_3" class="discrete">Input Parameter</h3>
<div class="ulist">
<ul>
<li>
<p><em>configuration_value</em>: The configuration value selected by the host.</p>
</li>
</ul>
</div>
<h3 id="_return_value_2" class="discrete">Return Value</h3>
<div class="ulist">
<ul>
<li>
<p><strong>UX_SUCCESS</strong> (0x00) The configuration was successfully set.</p>
</li>
</ul>
</div>
<h3 id="_example_6" class="discrete">Example</h3>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-c" data-lang="c">ULONG configuration_value;
UINT status;
/* The following example illustrates this service. */
status = ux_device_stack_configuration_set(configuration_value);
/* If status equals UX_SUCCESS, the operation was successful. */</code></pre>
</div>
</div>
<h3 id="_ux_device_stack_descriptor_send" class="discrete">ux_device_stack_descriptor_send</h3>
<div class="paragraph">
<p>Send a descriptor to the host</p>
</div>
<h3 id="_prototype_7" class="discrete">Prototype</h3>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-c" data-lang="c">UINT ux_device_stack_descriptor_send(
ULONG descriptor_type,
ULONG request_index,
ULONG host_length);</code></pre>
</div>
</div>
<h3 id="_description_7" class="discrete">Description</h3>
<div class="paragraph">
<p>This function is used by the device side to return a descriptor to the host. This descriptor can be a device descriptor, a configuration descriptor or a string descriptor.</p>
</div>
<div class="paragraph">
<p>The function issues protocol error or starts data stage of the control transfer in background, and return immediately.</p>
</div>
<h3 id="_parameters_4" class="discrete">Parameters</h3>
<div class="ulist">
<ul>
<li>
<p><em>descriptor_type</em>: The type of the descriptor. Must be one of the following values.</p>
<div class="ulist">
<ul>
<li>
<p><strong>UX_DEVICE_DESCRIPTOR_ITEM</strong></p>
</li>
<li>
<p><strong>UX_CONFIGURATION_DESCRIPTOR_ITEM</strong></p>
</li>
<li>
<p><strong>UX_STRING_DESCRIPTOR_ITEM</strong></p>
</li>
<li>
<p><strong>UX_DEVICE_QUALIFIER_DESCRIPTOR_ITEM</strong></p>
</li>
<li>
<p><strong>UX_OTHER_SPEED_DESCRIPTOR_ITEM</strong></p>
</li>
</ul>
</div>
</li>
<li>
<p><em>request_index</em>: The index of the descriptor.</p>
</li>
<li>
<p><em>host_length</em>: The length required by the host.</p>
</li>
</ul>
</div>
<h3 id="_return_values_5" class="discrete">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_ERROR</strong> (0xFF) The transfer was not completed.</p>
</li>
</ul>
</div>
<h3 id="_example_7" class="discrete">Example</h3>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-c" data-lang="c">ULONG descriptor_type;
ULONG request_index;
ULONG host_length;
UINT status;
/* The following example illustrates this service. */
status = ux_device_stack_descriptor_send(descriptor_type, request_index, host_length);
/* If status equals UX_SUCCESS, the operation was successful. */</code></pre>
</div>
</div>
<h3 id="_ux_device_stack_disconnect" class="discrete">ux_device_stack_disconnect</h3>
<div class="paragraph">
<p>Disconnect device stack</p>
</div>
<h3 id="_prototype_8" class="discrete">Prototype</h3>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-c" data-lang="c">UINT ux_device_stack_disconnect(VOID);</code></pre>
</div>
</div>
<h3 id="_description_8" class="discrete">Description</h3>
<div class="paragraph">
<p>The VBUS manager calls this function when there is a device disconnection. The device stack will inform all classes registered to this device and will thereafter release all the device resources, and return immediately.</p>
</div>
<h3 id="_input_parameter_4" class="discrete">Input Parameter</h3>
<div class="paragraph">
<p>None</p>
</div>
<h3 id="_return_value_3" class="discrete">Return Value</h3>
<div class="ulist">
<ul>
<li>
<p><strong>UX_SUCCESS</strong> (0x00) The device was disconnected.</p>
</li>
</ul>
</div>
<h3 id="_example_8" class="discrete">Example</h3>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-c" data-lang="c">UINT status;
/* The following example illustrates this service. */
status = ux_device_stack_disconnect();
/* If status equals UX_SUCCESS, the operation was successful. */</code></pre>
</div>
</div>
<h3 id="_ux_device_stack_endpoint_stall" class="discrete">ux_device_stack_endpoint_stall</h3>
<div class="paragraph">
<p>Request endpoint Stall condition</p>
</div>
<h3 id="_prototype_9" class="discrete">Prototype</h3>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-c" data-lang="c">UINT ux_device_stack_endpoint_stall(UX_SLAVE_ENDPOINT*endpoint);</code></pre>
</div>
</div>
<h3 id="_description_9" class="discrete">Description</h3>
<div class="paragraph">
<p>This function is called by the USB device class when an endpoint should return a Stall condition to the host.</p>
</div>
<div class="paragraph">
<p>The function calls device controller driver to stall the endpoint, and return immediately.</p>
</div>
<h3 id="_input_parameter_5" class="discrete">Input Parameter</h3>
<div class="ulist">
<ul>
<li>
<p><em>endpoint</em>: The endpoint on which the Stall condition is requested.</p>
</li>
</ul>
</div>
<h3 id="_return_value_4" class="discrete">Return Value</h3>
<div class="ulist">
<ul>
<li>
<p><strong>UX_SUCCESS</strong> (0x00) This operation was successful.</p>
</li>
<li>
<p><strong>UX_ERROR</strong> (0xFF) The device is in an invalid state.</p>
</li>
</ul>
</div>
<h3 id="_example_9" class="discrete">Example</h3>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-c" data-lang="c">UINT status;
/* The following example illustrates this service. */
status = ux_device_stack_endpoint_stall(endpoint);
/* If status equals UX_SUCCESS, the operation was successful. */</code></pre>
</div>
</div>
<h3 id="_ux_device_stack_host_wakeup" class="discrete">ux_device_stack_host_wakeup</h3>
<div class="paragraph">
<p>Wake up the host</p>
</div>
<h3 id="_prototype_10" class="discrete">Prototype</h3>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-c" data-lang="c">UINT ux_device_stack_host_wakeup(VOID);</code></pre>
</div>
</div>
<h3 id="_description_10" class="discrete">Description</h3>
<div class="paragraph">
<p>This function is called when the device wants to wake up the host. This command is only valid when the device is in suspend mode. It is up to the device application to decide when it wants to wake up the USB host. For instance, a USB modem can wake up a host when it detects a RING signal on the telephone line.</p>
</div>
<div class="paragraph">
<p>The function calls device controller driver to issue the wakeup signal, and return immediately.</p>
</div>
<h3 id="_input_parameter_6" class="discrete">Input Parameter</h3>
<div class="paragraph">
<p>None</p>
</div>
<h3 id="_return_values_6" class="discrete">Return values</h3>
<div class="ulist">
<ul>
<li>
<p><strong>UX_SUCCESS</strong> (0x00) The call was successful.</p>
</li>
<li>
<p><strong>UX_FUNCTION_NOT_SUPPORTED</strong> (0x54) The call failed (the device was probably not in the suspended mode).</p>
</li>
<li>
<p><strong>UX_ERROR</strong> (0xFF) The call failed.</p>
</li>
</ul>
</div>
<h3 id="_example_10" class="discrete">Example</h3>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-c" data-lang="c">UINT status;
/* The following example illustrates this service. */
status = ux_device_stack_host_wakeup();
/* If status equals UX_SUCCESS, the operation was successful. */</code></pre>
</div>
</div>
<h3 id="_ux_device_stack_initialize" class="discrete">ux_device_stack_initialize</h3>
<div class="paragraph">
<p>Initialize USB device stack</p>
</div>
<h3 id="_prototype_11" class="discrete">Prototype</h3>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-c" data-lang="c">UINT ux_device_stack_initialize(
UCHAR *device_framework_high_speed,
ULONG device_framework_length_high_speed,
UCHAR *device_framework_full_speed,
ULONG device_framework_length_full_speed,
UCHAR *string_framework,
ULONG string_framework_length,
UCHAR *language_id_framework,