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git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@3238 7fd9a85b-ad96-42d3-883c-3090e2eb8679
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patacongo 2011-01-09 17:59:41 +00:00
parent 1487b50a25
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nuttx/Documentation/NuttxPortingGuide.html
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@ -2163,7 +2163,7 @@ extern void up_ledoff(int led);
<b>USB Host Class Driver Registry</b>. <b>USB Host Class Driver Registry</b>.
The NuttX USB host infrastructure includes a <i>registry</i>. The NuttX USB host infrastructure includes a <i>registry</i>.
During its initialization, each USB host class driver must call the interface, <code>usbhost_registerclass()</code> During its initialization, each USB host class driver must call the interface, <code>usbhost_registerclass()</code>
in order add its interface to the register. in order add its interface to the registery.
Later, when a USB device is connected, the USB host controller will look up the USB host class driver that is needed to support the connected device in this registry. Later, when a USB device is connected, the USB host controller will look up the USB host class driver that is needed to support the connected device in this registry.
</p> </p>
<p> <p>
@ -2196,9 +2196,9 @@ extern void up_ledoff(int led);
As part of this enumeration process, the driver will As part of this enumeration process, the driver will
(1) get the device's configuration descriptor, (1) get the device's configuration descriptor,
(2) extract the class ID info from the configuration descriptor, (2) extract the class ID info from the configuration descriptor,
(3) call usbhost_findclass() to find the class that supports this device, (3) call <code>usbhost_findclass(</code>) to find the class that supports this device,
(4) call the create() method on the struct usbhost_registry_s interface to get a class instance, and (4) call the <code>create()</code> method on the <code>struct usbhost_registry_s interface</code> to get a class instance, and
finally (5) call the connect() method of the struct usbhost_class_s interface. finally (5) call the <code>connect()</code> method of the <code>struct usbhost_class_s</code> interface.
After that, the class is in charge of the sequence of operations. After that, the class is in charge of the sequence of operations.
</p> </p>
</ul> </ul>