usb_host_hid.c

microchip PIC18,pic24系列单片机USB驱动的开发源码

/******************************************************************************

  USB Host HID Device Driver

This is the Human Interface Device Class driver file for a USB Embedded Host
device. This file should be used in a project with usb_host.c to provided the 
USB hardware interface.

Acronyms/abbreviations used by this class:
    * HID - Human Interface Device

To interface with usb_host.c, the routine USBHostHIDInitialize() should be
specified as the Initialize() function, and USBHostHIDEventHandler() should
be specified as the EventHandler() function in the usbClientDrvTable[] array
declared in usb_config.h.

This driver can be configured to use transfer events from usb_host.c.  Transfer
events require more RAM and ROM than polling, but it cuts down or even
eliminates the required polling of the various USBxxxTasks functions.  For this
class, USBHostHIDTasks() is compiled out if transfer events from usb_host.c
are used.  However, USBHostTasks() still must be called to provide attach,
enumeration, and detach services.  If transfer events from usb_host.c
are going to be used, USB_ENABLE_TRANSFER_EVENT should be defined.  If transfer
status is going to be polled, USB_ENABLE_TRANSFER_EVENT should not be defined.

This driver can also be configured to provide HID transfer events to
the next layer. Generating these events requires a small amount of extra ROM,
but no extra RAM.  The layer above this driver must be configured to receive
and respond to the events.  If HID transfer events are going to be
sent to the next layer, USB_HID_ENABLE_TRANSFER_EVENT should be defined. If
HID transfer status is going to be polled, USB_HID_ENABLE_TRANSFER_EVENT 
should not be defined. In any case transfer event EVENT_HID_RPT_DESC_PARSED
will be sent to interface layer. Application must provide a function
to collect the report descriptor information. Report descriptor information will
be overwritten with new report descriptor(in case multiple interface are present)
information when cotrol returns to HID driver . This is done to avoid using 
extra RAM.

Since HID transfers are performed with interrupt taransfers, 
USB_SUPPORT_INTERRUPT_TRANSFERS must be defined.

* FileName:        usb_host_hid.c
* Dependencies:    None
* Processor:       PIC24/dsPIC30/dsPIC33/PIC32MX
* Compiler:        C30 v2.01/C32 v0.00.18
* Company:         Microchip Technology, Inc.

Software License Agreement

The software supplied herewith by Microchip Technology Incorporated
(the 揅ompany