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Chapter 6
6
The details of each device driver API function are described in Appendix B, “Device
Controller Driver API Reference” on page 323.
Note: μC/USB-Device device driver API function names may not be unique. Name clashes
between device drivers are avoided by never globally prototyping device driver functions
and ensuring that all references to functions within the driver are obtained by pointers
within the API structure. The developer may arbitrarily name the functions within the source
file so long as the API structure is properly declared. The user application should never
need to call API functions. Unless special care is taken, calling device driver functions may
lead to unpredictable results due to reentrancy.
When writing your own device driver, you can assume that each driver API function accepts
a pointer to a structure of the type USBD_DRV as one of its parameters. Through this
structure, you will be able to access the following fields:
typedef
struct
usbd_drv
USBD_DRV;
typedef usb_drv {
CPU_INT08U
USBD_DRV_API
USBD_DRV_CFG
void
USBD_DRV_BSP_API
DevNbr;
*API_Ptr;
*CfgPtr;
*DataPtr;
*BSP_API_Ptr;
(1)
(2)
(3)
(4)
(5)
};
Listing 6-2 USB Device Driver Data Type
L6-2(1)
Unique index to identify device.
L6-2(2)
Pointer to USB device controller driver API.
L6-2(3)
Pointer to USB device controller driver configuration.
L6-2(4)
Pointer to USB device controller driver specific data.
L6-2(5)
Pointer to USB device controller BSP.
80
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