;

;   Second stage AN2131QC (aka EzUSB) loader

;

;	

;   Copyright (c) 2004-2005 Martin Langer <martin-langer@gmx.de>

;

;   Written for Tascam US-122/US-224/US-428 audio/MIDI devices

;

;   This program is free software; you can redistribute it and/or

;   modify it under the terms of the GNU General Public License

;   as published by the Free Software Foundation; either version 2

;   of the License, or any later version.

;

;   This program is distributed in the hope that it will be useful,

;   but WITHOUT ANY WARRANTY; without even the implied warranty of

;   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

;   GNU General Public License for more details.

;

;   You should have received a copy of the GNU General Public License

;   along with this program; if not, write to the Free Software

;   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

;

;

.inc	"an2131.asm"

; ====================================================== interrupt vectors ===

	.org	0x0000			; reset vector

	ljmp    init

	.org	0x0043			; int2 vector (USB)

	ljmp	usb_jump_table		; autovector will replace byte 45

; =================================================================== init ===

init:

	mov	sp, #20h		; move stack pointer to 0x20

	mov	a, EIE

	setb	acc.0			; enable int2 (USB Interrupt)

	mov	EIE, a

	mov	dptr, #USBIRQ

	mov	a, #00011111b

	movx	@dptr, a		; clear Interrupt Request

	mov	dptr, #IN07IRQ

	mov	a, #11111111b

	movx	@dptr, a		; clear EP IN Interrupt Request

	mov	dptr, #OUT07IRQ

	mov	a, #11111111b

	movx	@dptr, a		; clear EP OUT Interrupt Request

	mov	dptr, #PORTCCFG

	movx	a, @dptr

	orl	a, #11000000b		; allow read and write on Port C

	movx	@dptr, a

	mov	dptr, #USBBAV

	movx	a, @dptr

	orl	a, #00000001b		; enable Autovector feature

	movx	@dptr, a

	mov	dptr, #USBIEN

	movx	a, @dptr

	orl	a, #00000101b		; enable 'Setup Data Available

	movx    @dptr, a		; Interrupt Request' and 'Setup Token

					; Interrupt Request'

	setb	ea			; enable global 8051 Interrupts

loop:

	sjmp	loop

; ========================================= usb interrupt service routines ===

usb_jump_table:

	ljmp	setup_data_avail_isr	; setup data available 

	.db	0		

	ljmp	start_of_frame_isr	; Start of frame

	.db	0

	ljmp	setup_token_isr		; loading setup data

	.db	0

	ljmp	usb_suspend_isr		; USB suspend

	.db	0

	ljmp	usb_reset_isr		; USB reset

	.db	0

	ljmp	spare_isr

	.db	0

	ljmp	ep0_in_isr

	.db	0

	ljmp	ep0_out_isr

	.db	0

	ljmp	ep1_in_isr

	.db	0

	ljmp	ep1_out_isr

	.db	0

	ljmp	ep2_in_isr

	.db	0

	ljmp	ep2_out_isr

	.db	0

	ljmp	ep3_in_isr

	.db	0

	ljmp	ep3_out_isr

	.db	0

	ljmp	ep4_in_isr

	.db	0

	ljmp	ep4_out_isr

	.db	0

	ljmp	ep5_in_isr

	.db	0

	ljmp	ep5_out_isr

	.db	0

	ljmp	ep6_in_isr

	.db	0

	ljmp	ep6_out_isr

	.db	0

	ljmp	ep7_in_isr

	.db	0

	ljmp	ep7_out_isr

	.db	0

setup_data_avail_isr:

	push	acc

	push	dph

	push	dpl

	push	dph1

	push	dpl1

	push	dps

	mov	a, EXIF

	clr	acc.4			; clear USB Interrupt Request

	mov	EXIF, a

	mov	dptr, #USBIRQ

	mov	a, #00000001b		; Setup Data Avail. Interrupt Request

	movx	@dptr, a

	pop	dps

	pop	dpl1

	pop	dph1

	pop	dpl

	pop	dph

	pop	acc

	reti

start_of_frame_isr:

	push	acc

	push	dph

	push	dpl

	push	dph1

	push	dpl1

	push	dps

	mov	a, EXIF

	clr	acc.4			; clear USB Interrupt Request

	mov	EXIF, a

	mov	dptr, #USBIRQ

	mov	a, #00000010b		; Start of frame Interrupt Request

	movx	@dptr, a

	pop	dps

	pop	dpl1

	pop	dph1

	pop	dpl

	pop	dph

	pop	acc

	reti

setup_token_isr:

	push	acc

	push	dph

	push	dpl

	push	dph1

	push	dpl1

	push	dps

	mov	a, EXIF

	clr	acc.4			; clear USB Interrupt Request

	mov	EXIF, a

	mov	dptr, #USBIRQ

	mov	a, #00000100b		; Setup Token Interrupt Request

	movx	@dptr, a

	pop	dps

	pop	dpl1

	pop	dph1

	pop	dpl

	pop	dph

	pop	acc

	reti

usb_suspend_isr:

	push	acc

	push	dph

	push	dpl

	push	dph1

	push	dpl1

	push	dps

	mov	a, EXIF

	clr	acc.4			; clear USB Interrupt Request

	mov	EXIF, a

	mov	dptr, #USBIRQ

	mov	a, #00001000b		; USB Suspend Interrupt Request

	movx	@dptr, a

	pop	dps

	pop	dpl1

	pop	dph1

	pop	dpl

	pop	dph

	pop	acc

	reti

usb_reset_isr:

	push	acc

	push	dph

	push	dpl

	push	dph1

	push	dpl1

	push	dps

	mov	a, EXIF

	clr	acc.4			; clear USB Interrupt Request

	mov	EXIF, a

	mov	dptr, #USBIRQ

	mov	a, #00010000b		; USB Reset Interrupt Request

	movx	@dptr, a

	pop	dps

	pop	dpl1

	pop	dph1

	pop	dpl

	pop	dph

	pop	acc

	reti

spare_isr:

	reti

ep0_in_isr:

	reti

ep0_out_isr:

	reti

ep1_in_isr:

	reti

ep1_out_isr:

	reti

ep2_in_isr:

	reti

ep2_out_isr:

	reti

ep3_in_isr:

	reti

ep3_out_isr:

	reti

ep4_in_isr:

	reti

ep4_out_isr:

	reti

ep5_in_isr:

	reti

ep5_out_isr:

	reti

ep6_in_isr:

	reti

ep6_out_isr:

	reti

ep7_in_isr:

	reti

ep7_out_isr:

	reti