hidclass.asm

这是用PIC芯片处理USB的源代码,包括初始化USB

;                            Software License Agreement
;
; The software supplied herewith by Microchip Technology Incorporated (the "Company")
; for its PICmicro(r) Microcontroller is intended and supplied to you, the Company's
; customer, for use solely and exclusively on Microchip PICmicro Microcontroller
; products.
;
; The software is owned by the Company and/or its supplier, and is protected under
; applicable copyright laws. All rights are reserved. Any use in violation of the
; foregoing restrictions may subject the user to criminal sanctions under applicable
; laws, as well as to civil liability for the breach of the terms and conditions of
; this license.
;
; THIS SOFTWARE IS PROVIDED IN AN "AS IS" CONDITION. NO WARRANTIES, WHETHER EXPRESS,
; IMPLIED OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF
; MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. THE
; COMPANY SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL OR
; CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
;
; ###############################################################################
;	filename:	HIDCLASS.ASM
;
;	Implements USB Human Interface Device (HID) class specific commands.
;
; ###############################################################################
;
;	Author(s):		Dan Butler and Reston Condit
;	Company:		Microchip Technology Inc
;
;	Revision:		1.25
;	Date:			23 April 2002
;	Assembled using:	MPASM 2.80
;################################################################################
;
;	include files:
;		P16C765.inc	Rev 1.00
;		usb_defs.inc	Rev 1.10
;
;################################################################################
#include <p16C765.inc>
#include "usb_defs.inc"

	extern	ReportDescriptor
	extern	ReportDescriptorLen
	extern	HID_Descriptor
	extern	Descriptions
	extern	BufferData
	extern	BufferDescriptor
	extern	wrongstate
	extern	USB_dev_req
	extern	EP0_maxLength
	extern	EP0_start
	extern	EP0_end
	extern	copy_descriptor_to_EP0
	extern	Send_0Len_pkt
	extern	Report_desc_index

	global	ClassSpecificRequest
 
USBBANK	code
; ******************************************************************
; Get Class Specific Descriptor
; ******************************************************************

ClassSpecificRequest
	pagesel	Dev2HostHIDRequest
	movf	BufferData+bmRequestType,w
	xorlw	0x21
	btfsc	STATUS,Z
	goto	Host2DevHIDRequest

	pagesel	Host2DevReportRequest
	movf	BufferData+bmRequestType,w
	xorlw	0x22
	btfsc	STATUS,Z
	goto	Host2DevReportRequest
	
	pagesel	Host2DevPhysicalRequest
	movf	BufferData+bmRequestType,w
	xorlw	0x23
	btfsc	STATUS,Z
	goto	Host2DevPhysicalRequest

	pagesel	Dev2HostHIDRequest
	movf	BufferData+bmRequestType,w
	xorlw	0xA1
	btfsc	STATUS,Z
	goto	Dev2HostHIDRequest

	pagesel	Dev2HostReportRequest
	movf	BufferData+bmRequestType,w
	xorlw	0xA2
	btfsc	STATUS,Z
	goto	Dev2HostReportRequest

	pagesel	Dev2HostPhysicalRequest
	movf	BufferData+bmRequestType,w
	xorlw	0xA3
	btfsc	STATUS,Z
	goto	Dev2HostPhysicalRequest

	pagesel	wrongstate
	goto	wrongstate

; Need to add code if you need to handle optional functions
; such as get/set_idle. Otherwise, send STALL buy calling
; to signal the host that the feature is not implemented.

Host2DevHIDRequest
	movf	BufferData+bRequest,w
	xorlw	0x01
	pagesel	GetHIDReport
	btfsc	STATUS,Z
	goto	GetHIDReport

	movf	BufferData+bRequest,w
	xorlw	0x02
	pagesel GetIdle
	btfsc	STATUS,Z
	goto	GetIdle

	movf	BufferData+bRequest,w
	xorlw	0x03
	pagesel GetPhysical
	btfsc	STATUS,Z
	goto	GetPhysical

	movf	BufferData+bRequest,w
	xorlw	0x06
	pagesel Get_Report_Descriptor
	btfsc	STATUS,Z
	goto	Get_Report_Descriptor

	movf	BufferData+bRequest,w
	xorlw	0x09
	pagesel SetHIDReport
	btfsc	STATUS,Z
	goto	SetHIDReport

	movf	BufferData+bRequest,w
	xorlw	0x0A
	pagesel	SetIdle
	btfsc	STATUS,Z
	goto	SetIdle

	movf	BufferData+bRequest,w
	xorlw	0x0B
	pagesel	SetProtocol
	btfsc	STATUS,Z
	goto	SetProtocol

	pagesel	wrongstate
	goto	wrongstate
    
; ******************************************************************
; Get Report Descriptor
; Returns the Mouse Report descriptor
; Checks for the report type (input, output or Feature).
; ******************************************************************
Get_Report_Descriptor
	global	Get_Report_Descriptor
	banksel	EP0_start
	movlw	GET_DESCRIPTOR
	movwf	USB_dev_req		; currently processing a get descriptor request

	movlw	8
	movwf	EP0_maxLength

	movf	BufferData+(wValue+1),w	; check report ID
	xorlw	0x01			; was it an Input Report?
	pagesel	TryOutputReport
	btfsc	STATUS,Z
	goto	TryOutputReport

	bcf	STATUS,C
	rlf	BufferData+wIndex,w
	pagesel	Report_desc_index
	call	Report_desc_index	; translate index to offset into descriptor table
	movwf	EP0_start
	bcf 	STATUS,C
	rlf 	BufferData+wIndex,w
	addlw	1			; point to high order byte
	call	Report_desc_index	; translate index to offset into descriptor table
	movwf	EP0_start+1
	pagesel	Descriptions
	call	Descriptions
	movwf	EP0_end
	incf	EP0_start,f
	pagesel	CheckReportLength
	goto	CheckReportLength

TryOutputReport
	movf	BufferData+(wValue+1),w	; check report ID
	xorlw	0x02			; was it an Output Report?
	pagesel	TryFeatureReport
	btfsc	STATUS,Z
	goto	TryFeatureReport

	bcf 	STATUS,C
	rlf 	BufferData+wIndex,w
	pagesel	Report_desc_index
	call	Report_desc_index	; translate index to offset into descriptor table
	movwf	EP0_start
	bcf 	STATUS,C
	rlf 	BufferData+wIndex,w
	addlw	1			; point to high order byte
	call	Report_desc_index	; translate index to offset into descriptor table
	movwf	EP0_start+1
	pagesel	Descriptions
	call	Descriptions
	movwf	EP0_end
	incf	EP0_start,f
	pagesel	CheckReportLength
	goto	CheckReportLength

TryFeatureReport
	movf	BufferData+(wValue+1),w	; check report ID
	xorlw	0x03			; was it an Output Report?
	pagesel	wrongstate
	btfsc	STATUS,Z
	goto	wrongstate

; Fill EP0IN buffer here...
	return

CheckReportLength
	movf	BufferData+(wLength+1),w ; Is the host requesting more than 255 bytes?
	pagesel nolimit_rpt
	btfss	STATUS,Z		; If so, the host is requesting more than we have
	goto	nolimit_rpt

check_low_bytes
	movf	BufferData+wLength,w
	subwf	EP0_end,w		; if not, compare the amount the host is request
	movf	BufferData+wLength,w 	; with the length of the descriptor
	btfsc	STATUS,C		; if the host is request less than the descriptor
	movwf	EP0_end 		; length, send only as much as what the host wants

nolimit_rpt
	incf	EP0_end,f
	pagesel	copy_descriptor_to_EP0
	call	copy_descriptor_to_EP0
	return

Get_HID_Descriptor
	global	Get_HID_Descriptor
	movlw	GET_DESCRIPTOR
	movwf	USB_dev_req		; currently processing a get descriptor request

	movlw	8
	movwf	EP0_maxLength

	movlw	low HID_Descriptor
	movwf	EP0_start
	movlw	high HID_Descriptor
	movwf	EP0_start + 1
	pagesel	Descriptions
	call	Descriptions		; get the HID descriptor length
	movwf	EP0_end

	movf	BufferData+(wLength+1),f
	pagesel	nolimit_hid
	btfss	STATUS,Z
	goto	nolimit_hid

	subwf	BufferData+wLength,w
	movf	BufferData+wLength,w
	btfss	STATUS,C
	movwf	EP0_end

nolimit_hid
	incf	EP0_end,f
	pagesel	copy_descriptor_to_EP0
	call	copy_descriptor_to_EP0
	return

Get_Physical_Descriptor
	return

Check_Class_Specific_IN
	global	Check_Class_Specific_IN
	pagesel	copy_descriptor_to_EP0
	movf	USB_dev_req,w
	xorlw	GET_DESCRIPTOR
	btfsc	STATUS,Z
	call	copy_descriptor_to_EP0
	return

; ******************************************************************
; These requests are parsed out, but nothing is actually done with them
; currently they simply stall EP0 to show that the request is not
; supported.  If you need to support them, fill in the code.
; ******************************************************************
Host2DevReportRequest
Host2DevPhysicalRequest
Dev2HostHIDRequest
Dev2HostReportRequest
Dev2HostPhysicalRequest
GetHIDReport
GetIdle
GetPhysical
SetProtocol
SetIdle
	pagesel	wrongstate
	goto	wrongstate

SetHIDReport
	movlw	HID_SET_REPORT
	movwf	USB_dev_req		; store status
	banksel	BD0OST
	return

	end