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USB Device Driver Functional Model
6-8-5 DEVICE SET ADDRESS
6
The device set address operation is performed by the setup transfer handler when a
SET_ADDRESS request is received. Figure 6-5 shows an overview of the device set address
operation.
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Figure 6-5 Device Set Address Diagram
F6-5(1)
Once the arguments of the setup request are validated, USBD_DrvAddrSet() is
called to inform the device driver layer of the new address. For controllers that
have hardware assistance in setting the device address after the status stage,
this device driver API is used to configure the device address and enable the
transition after the status stage. For controllers that activate the device address
as soon as configured, this device driver API should not perform any action.
F6-5(2)
The setup request status stage is transmitted to acknowledge the address
change.
F6-5(3)
After the status stage, the USBD_DrvAddrEn() is called to inform the device
driver layer to enable the new device address. For controllers that activate the
device address as soon as configured, this device driver API is responsible for
setting and enabling the new device address. For controllers that have
hardware assistance in setting the device address after the status stage, this
device driver API should not perform any action, since USBD_DrvAddrSet()
has already taken care of setting the new device.
97
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