buttonint.asm

来自「This program is distributed in the hope 」· 汇编 代码 · 共 115 行

;+---------------------------------------------------------------------------+
;|                                                                           |
;| Copyright (C) 2002,  Tom De Rybel                                         |
;|                      [e-mail]                                   |
;|                                                                           |
;| 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.                 |
;|                                                                           |
;|                                                                           |
;+---------------------------------------------------------------------------+
; Interrupt test of the Cypress EZ-USB
; Makes a LED connected to PB4 toggle on each interrupt recieved on #INT5
;


;+-------------------------------------+
;| Declaration of the EZ-USB registers |
;+-------------------------------------+
.equ DPL1,	0x84
.equ DPH1,	0x85
.equ DPS,	0x86
.equ CKCON,	0x8E
.equ SPC_FNC,	0x8F
.equ EXIF,	0x91
.equ MPAGE,	0x92
.equ SCON1,	0xC0
.equ SBUF1,	0xC1
.equ EICON,	0xD8
.equ EIE,	0xE8
.equ EIP,	0xF8
		
.equ CPUCS,     0x7F92	
.equ PORTACFG, 	0x7F93
.equ PORTBCFG, 	0x7F94
.equ PORTCCFG, 	0x7F95
.equ OUTA,     	0x7F96	
.equ OUTB,     	0x7F97
.equ OUTC,     	0x7F98
.equ PINSA,    	0x7F99
.equ PINSB,    	0x7F9A
.equ PINSC,    	0x7F9B
.equ OEA,      	0x7F9C
.equ OEB,      	0x7F9D
.equ OEC,      	0x7F9E

;+-------------------+
;| Interrupt vectors |
;+-------------------+
;
;Reset Vector
.org 0x00
ljmp init
;#INT5 Vector
.org 0x5B
ljmp int5	
	

.org 0x0100
;+-------------------------+
;| Initialisation sequence |
;+-------------------------+
; 
init:
	;;mov	0x92, #0x7F	; tc, allows movx Ri to access ez-usb memory

	mov dptr, #PORTBCFG	; All pins are standard PB pins
	mov a, #00100000b	; Besides PB5 -> #int5
	movx @dptr, a
	
	mov dptr, #OEB		; Pin PB4 is an output pin
	mov a, #00010000b
	movx @dptr, a

	mov IE, #10000000b	; Enable interrupts
	mov EIE, #00001000b	; Enable #INT5

		
;+--------------+
;| Main program |
;+--------------+		
;
begin:		
	nop
	ljmp begin

	
;+-----------------------------+
;| Interrupt 5 service routine |
;+-----------------------------+
;
int5:
	mov dptr, #PINSB	; Read the status on PB
	movx a, @DPTR		
	cpl acc.4		; Invert the PB4 bit
	mov dptr, #OUTB		; Write the result into the PB register
	movx @dptr, a

	mov a, EXIF		; Clear the #int5 interrupt flag
	clr acc.7
	mov EXIF, a
	
	reti