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2
Chapter 2
L2-5(1)
USBD_Init() initializes the USB device stack. This must be the first USB
function called by your application’s initialization code. If μC/USB-Device is
used with μC/OS-II or -III, OSInit() must be called prior to USBD_Init() in
order to intialize the kernel services.
L2-5(2)
USBD_DevAdd() creates and adds a USB device instance. A given USB device
instance is associated with a single USB device controller. μC/USB-Device can
support multiple USB device controllers concurrently. If your target supports
multiple controllers, you can create multiple USB device instances for them.
The function USBD_DevAdd() returns a device instance number; this number is
used as a parameter for all subsequent operations.
L2-5(3)
Create and add a high-speed configuration to your device. USBD_CfgAdd()
creates and adds a configuration to the USB device stack. At a minimum, your
USB device application only needs one full-speed and one high-speed
configuration if your device is a high-speed capable device. For a full-speed
device, only a full-speed configuration will be required. You can create as
many configurations as needed by your application, and you can associate
multiple instances of USB classes to these configurations. For example, you can
create a configuration to contain a mass storage device, and another
configuration for a human interface device such as a keyboard, and a vendor
specific device.
L2-5(4)
Create and add a full-speed configuration to your device.
L2-5(5)
Initialize the class-specific application demos by calling the function
App_USBD_XXXX_Init() where XXXX can be CDC, HID, MSC, PHDC or
VENDO R. Class-specific demos are enabled and disabled using the
APP_CFG_USB_XXXX_EN #define.
L2-5(6)
After all the class instances are created and added to the device configurations,
the application should call USBD_DevStart() . This function connects the
device with the host by enabling the pull-up resistor on the D+ line.
42
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