;/*******************************************************************************
;*                                                                              *
;*    File       : uP51s003.asm                                                 *
;*    Date       : 2004-9-5                                                     *
;*    Version    : 1.0                                                          *
;*                                                                              *
;*    Author     : kevin           kevin@dz51.com                               *
;*    Company    : Http://www.dz51.com                                          *
;*                                                                              *
;********************************************************************************
;*    Descriptoon:                                                              *
;*                 單片機播放音樂                                               *
;*                                                                              *
;*                                                                              *
;*                                                                              *
;********************************************************************************

SPK	EQU	P3.7			; 蜂鳴器所在端口

	ORG	0000H
	JMP	START
	
START:
	MOV	R3,#00H
NEXT:
	MOV	A,R3
	MOV	DPTR,#TABLE
	MOVC	A,@A+DPTR
	JZ	START
	MOV	R7,A
	INC	R3
	MOV	A,R3
	MOVC	A,@A+DPTR
	MOV	R2,A
	ACALL	SONG
	INC	R3
	SJMP	NEXT


;===============================================================================	
;===  歌曲播放子程序 ===
SONG:
	MOV	A,R2					; 取出節拍
	RL	A
	JNZ	KEEP
	MOV	A,#01H
KEEP:
	MOV	R2,A
REPEAT:
	ACALL	EIGHTH
	DJNZ	R2,REPEAT
	RET
	
;===============================================================================	
;===  產生1/8拍延時子程序  ===		
EIGHTH:
	MOV	A,R7					; 查表取出廷時參數,保存到R4
	MOV	DPTR,#DELAY_T
	MOVC	A,@A+DPTR
	MOV	R4,A
	MOV	A,R7					; 查表取出1/8拍周期數,保存到R5
	MOV	DPTR,#S_PARA
	MOVC	A,@A+DPTR
	MOV	R5,A
NEXTCYC:
	ACALL	SOUND
	DJNZ	R5,NEXTCYC
	RET
	
;===============================================================================	
;===  發聲子程序 ===	
SOUND:
	SETB	SPK
	ACALL	SDELAY
	CLR	SPK
	ACALL	SDELAY
	RET
	
;===============================================================================	
;===  延時子程序  ===
SDELAY:
	MOV	A,R4					; 廷時值在R4內
	MOV	R0,A
XL2:
	MOV	R1,#03H
DL1:
	NOP
	DJNZ	R1,DL1
	DJNZ	R0,XL2
	RET
;===============================================================================	
;===  1/8拍周期表  ===
S_PARA:
	DS	1DH
	DB	15H,16H,00
	DB	19H,00H,1CH,00H,1FH,21H,00H,25H
	DB	00H,29H,2CH,00H,31H,34H,37H,00H
	DB	3EH,41H,00H,49H,00H,52H,57H,00H
	DB	62H
	
;===============================================================================	
;===  延時參數表  ===
DELAY_T:
	DS	1DH
	DB	7EH,77H,00H
	DB	6AH,00H,5EH,00H,54H,4FH,00H,46H
	DB	00H,3FH,3BH,00H,35H,32H,2FH,00H
	DB	2AH,27H,00H,23H,00H,1FH,1DH,0C0H
	DB	1AH
	
;===============================================================================	
;===  歌曲表  ===
TABLE:
	DW	2202H,2902H,2902H,2902H,2906H,2702H	;我從山中來
	DW	2502H,2702H,2502H,2402H,2208H		;帶著蘭花草
	DW	2E02H,2E02H,2E02H,2E02H,2E06H,2C02H	;種在小園中
	DW	2902H,2C02H,2D02H,2A02H,2908H		;祈禱花開早
	DW	2902H,2E02H,2E02H,2C02H,2906H,2702H	;一日看三回
	DW	2502H,2702H,2502H,2402H,2206H,1D02H	;看得花時過
	DW	1D02H,2502H,2502H,2402H,2206H,2902H	;蘭花卻依然
	DW	2702H,2502H,2402H,2002H,2208H		;苞也無一個
	DW	0000H					;
	
	END