descript.asm

pic16c745 的 firmware的一个usb样例,供大家参考

;                            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:	DESCRIPT.ASM
;
; This file contains a set of descriptors for a standard mouse.  
;
; ###############################################################################
;
;	Author:			Dan Butler and Reston Condit
;	Company:		Microchip Technology Inc
;
;	Revision:		2.00
;	Date:			06 November 2002
;	Assembled using:	MPASM 2.80
;################################################################################
;
;	include files:
;		P16C745.inc	Rev 1.00
;		usb_defs.inc	Rev 2.00
;
;################################################################################
#include <p16C745.inc>
#include "usb_defs.inc"

USBBANK	code
	global	Config_desc_index
	global	Report_desc_index
	global	Descriptions
	global	DeviceDescriptor
	global	ReportDescriptor
	global	ReportDescriptorLen
	global	String0
	global	StringDescriptions
	global	GetStringIndex
	global	HID_Descriptor

	extern	EP0_start
	extern	temp		; temp var used in get config index
	extern	temp2 		; another temp, in bank2 

; ******************************************************************
; Given a configuration descriptor index, returns the beginning address
; of the descriptor within the descriptions table
; ******************************************************************
Config_desc_index
	movwf	temp
	movlw	HIGH CDI_start
	movwf	PCLATH
	movlw	low CDI_start
	addwf	temp,w
	btfsc	STATUS,C
	incf	PCLATH,f
	movwf	PCL
CDI_start			; this table calculates the offsets for each 
	retlw	low  Config1	; configuration descriptor from the beginning
	retlw	high Config1	; of the table
	retlw   low Config2
	retlw   high Config2

; ******************************************************************
; Given a report descriptor index, returns the beginning address
; of the descriptor within the descriptions table
; ******************************************************************
Report_desc_index
	movwf	temp
	movlw	HIGH RDI_start
	movwf	PCLATH
	movlw	low RDI_start
	addwf	temp,w
	btfsc	STATUS,C
	incf	PCLATH,f
	movwf	PCL
RDI_start		; this table calculates the offsets for each report
	retlw	low  ReportDescriptorLen  ; descriptor from the beginning
	retlw	high ReportDescriptorLen  ; of the table, effectively
	; more reports can be added here
	; retlw   low  ReportDescriptorLen2
	; retlw   high ReportDescriptorLen2
	; etc....

; ******************************************************************
; This table is polled by the host immediately after USB Reset has been released.
; This table defines the maximum packet size EP0 can take.
; See section 9.6.1 of the Rev 1.0 USB specification.
; These fields are application DEPENDENT. Modify these to meet
; your specifications.
; the offset is passed in P0 and P1 (P0 is low order byte).
; ******************************************************************
Descriptions
	banksel	EP0_start
	movf	EP0_start+1,w
	movwf	PCLATH
	movf	EP0_start,w
	movwf	PCL

DeviceDescriptor
StartDevDescr
	retlw	0x12		; bLengthLength of this descriptor
	retlw	0x01		; bDescType This is a DEVICE descriptor
	retlw	0x10		; bcdUSBUSB revision 1.10 (low byte)
	retlw	0x01		; high byte
	retlw	0x00		; bDeviceClasszero means each interface operates independently
	retlw	0x00		; bDeviceSubClass
	retlw	0x00		; bDeviceProtocol
	retlw	0x08		; bMaxPacketSize0 - inited in UsbInit()
	retlw	0xD8		; idVendor - 0x04D8 is Microchip Vendor ID
	retlw	0x04		; high order byte
	retlw	0x32		; idProduct = 50
	retlw	0x00
	retlw	0x00		; bcdDevice
	retlw	0x00
	retlw	0x01		; iManufacturer
	retlw	0x02		; iProduct
	retlw	0x00		; iSerialNumber - 3
	retlw	NUM_CONFIGURATIONS	; bNumConfigurations

; ******************************************************************
; This table is retrieved by the host after the address has been set.
; This table defines the configurations available for the device.
; See section 9.6.2 of the Rev 1.0 USB specification (page 184).
; These fields are application DEPENDENT. 
; Modify these to meet your specifications.
; ******************************************************************
Config1
	retlw	0x09		; bLength	Length of this descriptor
	retlw	0x02		; bDescType	2=CONFIGURATION
	retlw	EndConfig1 - Config1
	retlw	0x00
	retlw	0x01		; bNumInterfaces	Number of interfaces
	retlw	0x01		; bConfigValue	Configuration Value
	retlw	0x03		; iConfig	String Index for this config = #03
	retlw	0x80		; bmAttributes	attributes - bus powered, remote wakeup disabled
	retlw	0x32		; MaxPower	100mA
Interface1
	retlw	0x09		; length of descriptor
	retlw	INTERFACE;
	retlw	0x00		; number of interface, 0 based array
	retlw	0x00		; alternate setting
	retlw	0x02		; number of endpoints used in this interface
	retlw	0x03		; interface class - assigned by the USB
	retlw	0x00		; Not A boot device
	retlw	0x00		; interface protocol - none
	retlw 	0x00		; index to string descriptor that describes this interface
HID_Descriptor
	retlw	(Endpoint1 - HID_Descriptor)     ; descriptor size
	retlw	0x21		; descriptor type (HID)
	retlw	0x00
	retlw	0x01		; HID class release number (1.00)
	retlw	0x00		; Localized country code (none)
	retlw	0x01		; # of HID class descriptor to follow (1)
	retlw	0x22		; Report descriptor type (HID)
	retlw	low  (end_ReportDescriptor - ReportDescriptor)
	retlw	high (end_ReportDescriptor - ReportDescriptor)
Endpoint1
	retlw	0x07		; length of descriptor
	retlw	ENDPOINT
	retlw	0x81		; EP1, In
	retlw	0x03		; Interrupt
	retlw	0x08		; max packet size (8 bytes) low order byte
	retlw	0x00		; max packet size (8 bytes) high order byte
	retlw	0x0A		; polling interval (10ms)
Endpoint2
	retlw	0x07		; length of descriptor
	retlw	ENDPOINT
	retlw	0x01		; EP1, OUT
	retlw	0x03		; Interrupt
	retlw	0x08		; max packet size (8 bytes) low order byte
	retlw	0x00		; max packet size (8 bytes) high order byte
	retlw	0x0a		; polling interval (10ms)
EndConfig1

Config2
	retlw	0x09		; bLength	Length of this descriptor
	retlw	0x02		; bDescType	2=CONFIGURATION
	retlw	EndConfig2 - Config2
	retlw	0x00
	retlw	0x01		; bNumInterfaces	Number of interfaces
	retlw	0x02		; bConfigValue	Configuration Value
	retlw	0x04		; iConfig	String Index for this config = #04
	retlw	0x80		; bmAttributes	attributes - bus powered, remote wakeup disabled
	retlw	0x32		; MaxPower	100mA
Interface1c2
	retlw	0x09		; length of descriptor
	retlw	INTERFACE
	retlw	0x00		; number of interface, 0 based array
	retlw	0x00		; alternate setting
	retlw	0x02		; number of endpoints used in this interface
	retlw	0xFF		; interface class - assigned by the USB
	retlw	0x00		; not a boot device
	retlw	0x00		; interface protocol - none
	retlw 	0x00		; index to string descriptor that describes this interface
Endpoint1c2
	retlw	0x07		; length of descriptor
	retlw	ENDPOINT
	retlw	0x81		; EP1, In
	retlw	0x03		; Interrupt
	retlw	0x08		; max packet size (8 bytes) low order byte
	retlw	0x00		; max packet size (8 bytes) high order byte
	retlw	0x0a		; polling interval (10ms)
Endpoint2c2
	retlw	0x07		; length of descriptor
	retlw	ENDPOINT
	retlw	0x01		; EP1, OUT
	retlw	0x03		; Interrupt
	retlw	0x08		; max packet size (8 bytes) low order byte
	retlw	0x00		; max packet size (8 bytes) high order byte
	retlw	0x0a		; polling interval (10ms)	
EndConfig2

ReportDescriptorLen
	retlw	low  (end_ReportDescriptor-ReportDescriptor)
ReportDescriptor
	dt 0x06, 0x00, 0xff	; USAGE_PAGE (Vendor Defined Page 1)
	dt 0x09, 0x01		; USAGE (Vendor Usage 1)
	dt 0xa1, 0x01		; COLLECTION (Application)
	dt 0x19, 0x01		;   USAGE_MINIMUM (Vendor Usage 1)
	dt 0x29, 0x08		;   USAGE_MAXIMUM (Vendor Usage 8)
	dt 0x15, 0x00		;   LOGICAL_MINIMUM (0)
	dt 0x26, 0xff, 0x00	;   LOGICAL_MAXIMUM (255)
	dt 0x75, 0x08		;   REPORT_SIZE (8)
	dt 0x95, 0x08		;   REPORT_COUNT (8)
	dt 0x81, 0x02		;   INPUT (Data,Var,Abs)
	dt 0x19, 0x01		;   USAGE_MINIMUM (Vendor Usage 1)
	dt 0x29, 0x08		;   USAGE_MAXIMUM (Vendor Usage 8)
	dt 0x91, 0x02		;   OUTPUT (Data,Var,Abs)
	dt 0xc0			; END_COLLECTION
end_ReportDescriptor
	
; ******************************************************************
; Given a string descriptor index, returns the beginning address
; of the descriptor within the descriptions table
; ******************************************************************
GetStringIndex	
	movwf	temp
	movlw	HIGH StringIndexTable
	movwf	PCLATH
	movlw	LOW StringIndexTable
	addwf	temp,w
	btfsc	STATUS,C
	incf	PCLATH,f
	movwf	PCL

StringIndexTable
	retlw	low  String0	; LangIDs
	retlw	high String0
	retlw	low  String1
	retlw	high String1
	retlw	low  String2
	retlw	high String2
	retlw	low  String3
	retlw	high String3
	retlw	low  String4
	retlw	high String4

StringDescriptions
	banksel	EP0_start
	movf	EP0_start+1,w
	movwf	PCLATH
	movf	EP0_start,w
	movwf	PCL

String0
	retlw	low (String1 - String0)	; length of string 
	retlw	0x03		; descriptor type 3?
	retlw	0x09		; language ID (as defined by MS 0x0409)
	retlw	0x04
String1
	retlw	String2-String1	; length of string
	retlw	0x03		; string descriptor type 3
	retlw	'M'
	retlw	0x00
	retlw	'i'
	retlw	0x00
	retlw	'c'
	retlw	0x00
	retlw	'r'
	retlw	0x00
	retlw	'o'
	retlw	0x00
	retlw	'c'
	retlw	0x00
	retlw	'h'
	retlw	0x00
	retlw	'i'
	retlw	0x00
	retlw	'p'
	retlw	0x00
	retlw	' '
	retlw	0x00
	retlw	'T'
	retlw	0x00
	retlw	'e'
	retlw	0x00
	retlw	'c'
	retlw	0x00
	retlw	'h'
	retlw	0x00
	retlw	'n'
	retlw	0x00
	retlw	'o'
	retlw	0x00
	retlw	'l'
	retlw	0x00
	retlw	'o'
	retlw	0x00
	retlw	'g'
	retlw	0x00
	retlw	'y'
	retlw	0x00
	retlw	' '
	retlw	0x00
	retlw	'I'
	retlw	0x00
	retlw	'n'
	retlw	0x00
	retlw	'c'
	retlw	0x00
	retlw	'.'
	retlw	0x00
String2
	retlw	String3-String2
	retlw	0x03
	retlw	'P'
	retlw	0x00
	retlw	'I'
	retlw	0x00
	retlw	'C'
	retlw	0x00
	retlw	'k'
	retlw	0x00
	retlw	'i'
	retlw	0x00
	retlw	't'
	retlw	0x00
	retlw	'('
	retlw	0x00
	retlw	'T'
	retlw	0x00
	retlw	'M'
	retlw	0x00
	retlw	')'
	retlw	0x00
	retlw	' '
	retlw	0x00
	retlw	'1'
	retlw	0x00
	retlw	' '
	retlw	0x00
	retlw	'F'
	retlw	0x00
	retlw	'L'
	retlw	0x00
	retlw	'A'
	retlw	0x00
	retlw	'S'
	retlw	0x00
	retlw	'H'
	retlw	0x00
	retlw	' '
	retlw	0x00
	retlw	'S'
	retlw	0x00
	retlw	't'
	retlw	0x00
	retlw	'a'
	retlw	0x00
	retlw	'r'
	retlw	0x00
	retlw	't'
	retlw	0x00
	retlw	'e'
	retlw	0x00
	retlw	'r'
	retlw	0x00
	retlw	' '
	retlw	0x00
	retlw	'K'
	retlw	0x00
	retlw	'i'
	retlw	0x00
	retlw	't'
	retlw	0x00
String3
	retlw	String4-String3
	retlw	0x03
	retlw	'C'
	retlw	0x00
	retlw	'o'
	retlw	0x00
	retlw	'n'
	retlw	0x00
	retlw	'f'
	retlw	0x00
	retlw	'i'
	retlw	0x00
	retlw	'g'
	retlw	0x00
	retlw	'.'
	retlw	0x00
	retlw	' '
	retlw	0x00
	retlw	'1'
	retlw	0x00
	retlw	':'
	retlw	0x00
	retlw	' '
	retlw	0x00
	retlw	'H'
	retlw	0x00
	retlw	'I'
	retlw	0x00
	retlw	'D'
	retlw	0x00
String4
	retlw	String5-String4
	retlw	0x03
	retlw	'C'
	retlw	0x00
	retlw	'o'
	retlw	0x00
	retlw	'n'
	retlw	0x00
	retlw	'f'
	retlw	0x00
	retlw	'i'
	retlw	0x00
	retlw	'g'
	retlw	0x00
	retlw	'.'
	retlw	0x00
	retlw	' '
	retlw	0x00
	retlw	'2'
	retlw	0x00
	retlw	':'
	retlw	0x00
	retlw	' '
	retlw	0x00
	retlw	'n'
	retlw	0x00
	retlw	'o'
	retlw	0x00
	retlw	'n'
	retlw	0x00
	retlw	'-'
	retlw	0x00
	retlw	'H'
	retlw	0x00
	retlw	'I'
	retlw	0x00
	retlw	'D'
	retlw	0x00
String5
	end