usb_proc.asm

基于HT82K96E的usb鼠标实现源程序

include	ht82k96e.inc
include	usbrf.inc
include	usbfifo.inc

start_var	equ		20h
extern		stall		:byte
extern		reportkbtime	:byte
extern		baltkbprotocol	:bit
extern		bwait_setup	:bit

usbproc    .section   at 45fh   'code'

ram_init:      				;clear ram {20~bf}
	mov	a,start_var
	mov	mp0,a
	mov	a,160
next_addr2:
	clr	wdt	
	clr	r0
	inc	mp0
	sdz	acc
	jmp	next_addr2
	set	stall
	mov	a,125
	mov	reportkbtime,a
	set	baltkbprotocol
	set	bwait_setup
	ret

start_timer:
	clr	intc.0
	clr	timer1_on

	mov	a,10000000b
	mov	tmr0c,a
	mov	a,10000000b
	mov	tmr1c,a

	mov	a,090h
	mov	tmr1l,a
	mov	a,0e8h
	mov	tmr1h,a			;about 4ms for 6mhz

	mov	a,00001011b
	mov	intc,a
	set	timer1_on
	clr	timer0_on
	ret       

config_usb:
	mov	a,01000000b		;6mhz
	mov	clk_ctrl_reg,a

	mov	a,00000000b		;switch to usb mode, internal adc reference voltage
	mov	int_reg,a		;clear all pipe interrupt
	ret

public	ram_init
public	config_usb
public	start_timer

	end