key.s

基于ATmega64的MP3程序

	.module key.c
	.area text(rom, con, rel)
	.dbfile D:\TDDownload\MP3BOA~1.8\key.c
	.dbfunc e key_init _key_init fV
	.even
_key_init::
	.dbline -1
	.dbline 16
; //ICC-AVR application builder : 2005-11-12 17:11:59
; // Target : M16
; // Crystal: 8.0000Mhz
; // copyright:鲁军波(endylu)
; // www.shop34612283.taobao.com
; // www.adembed.com
; #include <iom16v.h>
; #include <macros.h>
; #include "main.h"
; 
; uint8 key_state;
; extern uint8 key_value;
; 
; //=======================================================================
; void key_init(void)
; {
	.dbline 17
;  key_ddr&=~all_key;
	in R24,0x11
	andi R24,7
	out 0x11,R24
	.dbline 18
;  key_port|=all_key;
	in R24,0x12
	ori R24,248
	out 0x12,R24
	.dbline 21
; 
;  //t/c0初始化
;  TCCR0=0X0D;
	ldi R24,13
	out 0x33,R24
	.dbline 22
;  TCNT0=0X00;
	clr R2
	out 0x32,R2
	.dbline 23
;  OCR0=0XF0;         //定时30ms
	ldi R24,240
	out 0x3c,R24
	.dbline 24
;  TIMSK|=0X02;
	in R24,0x39
	ori R24,2
	out 0x39,R24
	.dbline -2
L1:
	.dbline 0 ; func end
	ret
	.dbend
	.dbfunc e read_keyboard _read_keyboard fV
	.even
_read_keyboard::
	.dbline -1
	.dbline 30
;  
; }
; 
; //=======================================================================
; void read_keyboard(void)
; {
	.dbline 31
;  switch(key_state)
	lds R16,_key_state
	clr R17
	cpi R16,0
	cpc R16,R17
	breq L6
X0:
	cpi R16,1
	ldi R30,0
	cpc R17,R30
	breq L9
	cpi R16,2
	ldi R30,0
	cpc R17,R30
	breq L12
	xjmp L3
X1:
	.dbline 32
;  {
L6:
	.dbline 34
;   case 0:
;          if((key_pin&all_key)!=all_key)
	in R24,0x10
	andi R24,248
	cpi R24,248
	breq L4
	.dbline 35
; 		    key_state++;
	lds R24,_key_state
	subi R24,255    ; addi 1
	sts _key_state,R24
	.dbline 36
; 		 break;
	xjmp L4
L9:
	.dbline 38
;   case 1:
;          if((key_pin&all_key)!=all_key)
	in R24,0x10
	andi R24,248
	cpi R24,248
	breq L10
	.dbline 39
; 		    {
	.dbline 40
; 			 key_state++;
	lds R24,_key_state
	subi R24,255    ; addi 1
	sts _key_state,R24
	.dbline 41
; 			 key_value=key_pin&all_key;
	in R24,0x10
	andi R24,248
	sts _key_value,R24
	.dbline 42
; 			}
	xjmp L4
L10:
	.dbline 43
; 		 else key_state--;
	lds R24,_key_state
	subi R24,1
	sts _key_state,R24
	.dbline 44
; 		 break;
	xjmp L4
L12:
	.dbline 46
;   case 2:
;          if((key_pin&all_key)==all_key)
	in R24,0x10
	andi R24,248
	cpi R24,248
	brne L4
	.dbline 47
; 		    {key_state=0;
	.dbline 47
	clr R2
	sts _key_state,R2
	.dbline 48
; 			}
	.dbline 49
; 		 break;
L3:
L4:
	.dbline -2
L2:
	.dbline 0 ; func end
	ret
	.dbend
	.area bss(ram, con, rel)
	.dbfile D:\TDDownload\MP3BOA~1.8\key.c
_key_state::
	.blkb 1
	.dbsym e key_state _key_state c