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<meta name="description" content="USBX contains a CDC-ECM class for the host and device side. This class is designed to be used with NetX Duo, specifically, the USBX CDC-ECM class acts as the driver for NetX Duo. This is why there are no CDC-ECM APIs listed in Chapter 5.">
<title>Chapter 6 - USBX CDC-ECM Class Usage</title>
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<h1>Chapter 6 - USBX CDC-ECM Class Usage</h1>
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<div class="paragraph">
<p>USBX contains a CDC-ECM class for the host and device side. This class is designed to be used with NetX Duo, specifically, the USBX CDC-ECM class acts as the driver for NetX Duo. This is why there are no CDC-ECM APIs listed in Chapter 5.</p>
</div>
<div class="paragraph">
<p>Once NetX Duo and USBX are initialized and an instance of a CDC-ECM device is found by USBX, the application exclusively uses NetX Duo to communicate with the device. Initialization follows the pattern shown in the example below.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-c" data-lang="c">UINT status;
/* The USB controller should be the last component initialized so that
everything is ready when data starts being received. */
/* Initialize USBX. */
ux_system_initialize(memory_pointer, UX_USBX_MEMORY_SIZE, UX_NULL, 0);
/* The code below is required for installing the host portion of USBX */
status = ux_host_stack_initialize(UX_NULL);
/* Register cdc_ecm class. */
status = ux_host_stack_class_register(_ux_system_host_class_cdc_ecm_name,
ux_host_class_cdc_ecm_entry);
/* Perform the initialization of the network driver. */
_ux_network_driver_init();
/* Initialize NetX Duo. Refer to NetX Duo user guide for details to add initialization code. */
/* Register the platform-specific USB controller. */
status = ux_host_stack_hcd_register("controller_name", controller_entry, param1, param2);
/* Find the CDC-ECM class. */
class_cdc_ecm_get();
/* Now wait for the link to be up. */
while (cdc_ecm -> ux_host_class_cdc_ecm_link_state != UX_HOST_CLASS_CDC_ECM_LINK_STATE_UP)
tx_thread_sleep(10);
/* At this point, everything has been initialized, and we've found a CDC-ECM device.
Now NetX Duo can be used to communicate with the device. */</code></pre>
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