USB Device Driver Functional Model
L6-7(1)
Device BSP initialization function pointer
6
L6-7(2)
Device BSP connect function pointer
L6-7(3)
Device BSP disconnect function pointer
The details of each device BSP API function are described in section B-2 “Device Driver BSP
Functions” on page 350.
6-8 USB DEVICE DRIVER FUNCTIONAL MODEL
The USB device controller can operate in distinct modes while transferring data. This
section describes the common sequence of operations for the receive and transmit API
functions in the device driver, highlighting potential differences when the controller is
operating on FIFO or DMA mode. While there are some controllers that are strictly FIFO
based or DMA based, there are controllers that can operate in both modes depending on
hardware characteristics. For this type of controller, the device driver will employ the
appropriate sequence of operations depending, for example, on the endpoint type.
6-8-1 DEVICE SYNCHRONOUS RECEIVE
The device synchronous receive operation is initiated by the calls: USBD_BulkRx() ,
USBD_CtrlRx() , and USBD_IntrRx() . Figure 6-1 shows an overview of the device
synchronous receive operation.
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Figure 6-1 Device Synchronous Receive Diagram
89
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