fat.s

mp3代码 要用的干净下啊 希望用东西共享啊

	sts _FileIndex+2+1,R21
	sts _FileIndex+2,R20
	sts _FileIndex+2+2+1,R23
	sts _FileIndex+2+2,R22
	xjmp L60
L57:
	.dbline 133
	lds R16,_FileIndex+6
	lds R17,_FileIndex+6+1
	xcall _FAT_ReadFAT
	sts _FileIndex+6+1,R17
	sts _FileIndex+6,R16
L58:
	.dbline 132
	ldi R20,1
	ldi R21,0
	ldi R22,0
	ldi R23,0
	lds R4,_FileIndex+2+2
	lds R5,_FileIndex+2+2+1
	lds R2,_FileIndex+2
	lds R3,_FileIndex+2+1
	add R2,R20
	adc R3,R21
	adc R4,R22
	adc R5,R23
	sts _FileIndex+2+1,R3
	sts _FileIndex+2,R2
	sts _FileIndex+2+2+1,R5
	sts _FileIndex+2+2,R4
L60:
	.dbline 132
	movw R2,R12
	clr R4
	clr R5
	lds R8,_FileIndex+2+2
	lds R9,_FileIndex+2+2+1
	lds R6,_FileIndex+2
	lds R7,_FileIndex+2+1
	cp R6,R2
	cpc R7,R3
	cpc R8,R4
	cpc R9,R5
	brlo L57
	.dbline 136
;                 FileIndex.ClusID = FAT_ReadFAT(FileIndex.ClusID);
; 
; 
;         FileIndex.i = (Start % BytePerClus) / 512; //开始位置所在扇区簇内偏移
	movw R2,R10
	clr R4
	clr R5
	movw R30,R28
	ldd R6,z+40
	ldd R7,z+41
	ldd R8,z+42
	ldd R9,z+43
	st -y,R5
	st -y,R4
	st -y,R3
	st -y,R2
	movw R16,R6
	movw R18,R8
	xcall mod32u
	ldi R24,9
	ldi R25,0
	st -y,R24
	xcall lsr32
	sts _FileIndex+2+1,R17
	sts _FileIndex+2,R16
	sts _FileIndex+2+2+1,R19
	sts _FileIndex+2+2,R18
	.dbline 137
;         FileIndex.m = (Start % BytePerClus) % 512; //开始位置扇区内偏移
	movw R2,R10
	clr R4
	clr R5
	movw R30,R28
	ldd R6,z+40
	ldd R7,z+41
	ldd R8,z+42
	ldd R9,z+43
	st -y,R5
	st -y,R4
	st -y,R3
	st -y,R2
	movw R16,R6
	movw R18,R8
	xcall mod32u
	ldi R20,255
	ldi R21,1
	ldi R22,0
	ldi R23,0
	movw R2,R16
	movw R4,R18
	and R2,R20
	and R3,R21
	and R4,R22
	and R5,R23
	sts _FileIndex+1,R3
	sts _FileIndex,R2
	.dbline 139
; 
;         FileIndex.LBA = ClusConvLBA(FileIndex.ClusID) + FileIndex.i; //开始位置所在的扇区号
	lds R16,_FileIndex+6
	lds R17,_FileIndex+6+1
	xcall _ClusConvLBA
	lds R4,_FileIndex+2+2
	lds R5,_FileIndex+2+2+1
	lds R2,_FileIndex+2
	lds R3,_FileIndex+2+1
	movw R6,R16
	movw R8,R18
	add R6,R2
	adc R7,R3
	adc R8,R4
	adc R9,R5
	sts _FileIndex+8+1,R7
	sts _FileIndex+8,R6
	sts _FileIndex+8+2+1,R9
	sts _FileIndex+8+2,R8
	.dbline 140
;         FAT_ReadBlock(FileIndex.LBA); //预读取一个扇区的内容
	movw R16,R6
	movw R18,R8
	xcall _FAT_ReadBlock
	.dbline 141
; 		return (FileDir.Size);
	movw R30,R28
	ldd R16,z+28
	ldd R17,z+29
	ldd R18,z+30
	ldd R19,z+31
	.dbline -2
L52:
	adiw R28,32
	xcall pop_gset4
	adiw R28,2
	.dbline 0 ; func end
	ret
	.dbsym l FileDir 0 S[.4]
	.dbsym r BytePerClus 10 i
	.dbsym r ClusNum 12 i
	.dbsym l Start 40 l
	.dbsym r Name 12 pc
	.dbend
	.dbfunc e FAT_FileRead _FAT_FileRead fi
;           data -> R10,R11
;           Data -> y+14
;         Length -> y+10
	.even
_FAT_FileRead::
	xcall push_arg4
	xcall push_gset3
	sbiw R28,4
	.dbline -1
	.dbline 147
; }
; //********************************************************************************************  
; //读取文件的数据  
; //********************************************************************************************  
; uint16 FAT_FileRead(uint32 Length, void* Data) 
; {
	.dbline 148
;         uint8 *data = Data;
	ldd R10,y+14
	ldd R11,y+15
	.dbline 149
;         goto FAT_FileRead_Start;
	xjmp L91
L74:
	.dbline 152
; 
;         while(1) 
; 		{
	.dbline 153
;                 FileIndex.ClusID = FAT_ReadFAT(FileIndex.ClusID); //下一簇簇号
	lds R16,_FileIndex+6
	lds R17,_FileIndex+6+1
	xcall _FAT_ReadFAT
	sts _FileIndex+6+1,R17
	sts _FileIndex+6,R16
	.dbline 154
; 				if (FileIndex.ClusID==0xFFFF)
	cpi R16,255
	ldi R30,255
	cpc R17,R30
	brne L79
	.dbline 155
; 				       {
	.dbline 156
; 					    return FALSE;                                 //文件结束
	clr R16
	clr R17
	xjmp L72
L79:
	.dbline 158
; 						}
;                 FileIndex.LBA = ClusConvLBA(FileIndex.ClusID);  //簇的开始扇区号
	lds R16,_FileIndex+6
	lds R17,_FileIndex+6+1
	xcall _ClusConvLBA
	sts _FileIndex+8+1,R17
	sts _FileIndex+8,R16
	sts _FileIndex+8+2+1,R19
	sts _FileIndex+8+2,R18
	.dbline 159
;                 FileIndex.i = 0;                                //簇内扇区偏移
	ldi R20,0
	ldi R21,0
	ldi R22,0
	ldi R23,0
	sts _FileIndex+2+1,R21
	sts _FileIndex+2,R20
	sts _FileIndex+2+2+1,R23
	sts _FileIndex+2+2,R22
	xjmp L86
L85:
	.dbline 161
;                 while(FileIndex.i < Info.BPB_SecPerClus) 
; 				{
	.dbline 162
;                         FAT_ReadBlock(FileIndex.LBA);           //读当前簇
	lds R18,_FileIndex+8+2
	lds R19,_FileIndex+8+2+1
	lds R16,_FileIndex+8
	lds R17,_FileIndex+8+1
	xcall _FAT_ReadBlock
	.dbline 163
;                         FileIndex.m = 0;                        //当前扇区内的数据偏移
	clr R2
	clr R3
	sts _FileIndex+1,R3
	sts _FileIndex,R2
	xjmp L91
L90:
	.dbline 166
; FAT_FileRead_Start:
;                         while(FileIndex.m < 512) 
; 						{
	.dbline 167
;                                 *data++ = BUFFER[FileIndex.m];  
	ldi R24,<_BUFFER
	ldi R25,>_BUFFER
	lds R30,_FileIndex
	lds R31,_FileIndex+1
	add R30,R24
	adc R31,R25
	ldd R2,z+0
	movw R30,R10
	st Z+,R2
	movw R10,R30
	.dbline 168
;                                 FileIndex.m++;
	lds R24,_FileIndex
	lds R25,_FileIndex+1
	adiw R24,1
	sts _FileIndex+1,R25
	sts _FileIndex,R24
	.dbline 170
;                                 //如果读取完成就退出
;                                 if(--Length == 0)
	ldi R20,1
	ldi R21,0
	ldi R22,0
	ldi R23,0
	movw R30,R28
	ldd R2,z+10
	ldd R3,z+11
	ldd R4,z+12
	ldd R5,z+13
	sub R2,R20
	sbc R3,R21
	sbc R4,R22
	sbc R5,R23
	movw R30,R28
	std z+0,R2
	std z+1,R3
	std z+2,R4
	std z+3,R5
	movw R30,R28
	ldd R2,z+0
	ldd R3,z+1
	ldd R4,z+2
	ldd R5,z+3
	movw R30,R28
	std z+10,R2
	std z+11,R3
	std z+12,R4
	std z+13,R5
	ldi R20,0
	ldi R21,0
	ldi R22,0
	ldi R23,0
	movw R30,R28
	ldd R2,z+0
	ldd R3,z+1
	ldd R4,z+2
	ldd R5,z+3
	cp R2,R20
	cpc R3,R21
	cpc R4,R22
	cpc R5,R23
	brne L93
	.dbline 171
; 								        {
	.dbline 172
; 										return (FileIndex.m);
	lds R16,_FileIndex
	lds R17,_FileIndex+1
	xjmp L72
L93:
	.dbline 174
L91:
	.dbline 165
	lds R24,_FileIndex
	lds R25,_FileIndex+1
	cpi R24,0
	ldi R30,2
	cpc R25,R30
	brsh X2
	xjmp L90
X2:
	.dbline 175
	ldi R20,1
	ldi R21,0
	ldi R22,0
	ldi R23,0
	lds R4,_FileIndex+8+2
	lds R5,_FileIndex+8+2+1
	lds R2,_FileIndex+8
	lds R3,_FileIndex+8+1
	add R2,R20
	adc R3,R21
	adc R4,R22
	adc R5,R23
	sts _FileIndex+8+1,R3
	sts _FileIndex+8,R2
	sts _FileIndex+8+2+1,R5
	sts _FileIndex+8+2,R4
	.dbline 176
	ldi R20,1
	ldi R21,0
	ldi R22,0
	ldi R23,0
	lds R4,_FileIndex+2+2
	lds R5,_FileIndex+2+2+1
	lds R2,_FileIndex+2
	lds R3,_FileIndex+2+1
	add R2,R20
	adc R3,R21
	adc R4,R22
	adc R5,R23
	sts _FileIndex+2+1,R3
	sts _FileIndex+2,R2
	sts _FileIndex+2+2+1,R5
	sts _FileIndex+2+2,R4
	.dbline 177
L86:
	.dbline 160
	lds R2,_Info
	clr R3
	clr R4
	clr R5
	lds R8,_FileIndex+2+2
	lds R9,_FileIndex+2+2+1
	lds R6,_FileIndex+2
	lds R7,_FileIndex+2+1
	cp R6,R2
	cpc R7,R3
	cpc R8,R4
	cpc R9,R5
	brsh X3
	xjmp L85
X3:
	.dbline 178
L75:
	.dbline 151
	xjmp L74
X1:
	.dbline 179
; 										}
;                         }
;                         FileIndex.LBA++;                         //下一扇区号
;                         FileIndex.i++;
;                 }
;         }
; return FALSE;
	clr R16
	clr R17
	.dbline -2
L72:
	adiw R28,4
	xcall pop_gset3
	adiw R28,4
	.dbline 0 ; func end
	ret
	.dbsym r data 10 pc
	.dbsym l Data 14 pV
	.dbsym l Length 10 l
	.dbend
	.dbfunc e FAT_FileWrite _FAT_FileWrite fV
;           data -> R10,R11
;           Data -> y+14
;         Length -> y+10
	.even
_FAT_FileWrite::
	xcall push_arg4
	xcall push_gset3
	sbiw R28,4
	.dbline -1
	.dbline 184
; }
; //********************************************************************************************  
; //写文件的数据  
; //********************************************************************************************  
; void FAT_FileWrite(uint32 Length, void* Data) {
	.dbline 185
;         uint8 *data = Data;
	ldd R10,y+14
	ldd R11,y+15
	.dbline 187
; 
;         goto FAT_FileWrite_Start;
	xjmp L113
L99:
	.dbline 189
; 
;         while(1) {
	.dbline 190
;                 FileIndex.ClusID = FAT_ReadFAT(FileIndex.ClusID); //下一簇簇号
	lds R16,_FileIndex+6
	lds R17,_FileIndex+6+1
	xcall _FAT_ReadFAT
	sts _FileIndex+6+1,R17
	sts _FileIndex+6,R16
	.dbline 191
;                 FileIndex.LBA = ClusConvLBA(FileIndex.ClusID);
	xcall _ClusConvLBA
	sts _FileIndex+8+1,R17
	sts _FileIndex+8,R16
	sts _FileIndex+8+2+1,R19
	sts _FileIndex+8+2,R18
	.dbline 192
;                 FileIndex.i = 0;
	ldi R20,0
	ldi R21,0
	ldi R22,0
	ldi R23,0
	sts _FileIndex+2+1,R21
	sts _FileIndex+2,R20
	sts _FileIndex+2+2+1,R23
	sts _FileIndex+2+2,R22
	xjmp L108
L107:
	.dbline 193
;                 while(FileIndex.i < Info.BPB_SecPerClus) {
	.dbline 194
;                         FAT_ReadBlock(FileIndex.LBA);
	lds R18,_FileIndex+8+2
	lds R19,_FileIndex+8+2+1
	lds R16,_FileIndex+8
	lds R17,_FileIndex+8+1
	xcall _FAT_ReadBlock
	.dbline 195
;                         FileIndex.m = 0;
	clr R2
	clr R3
	sts _FileIndex+1,R3
	sts _FileIndex,R2
	xjmp L113
L112:
	.dbline 197
; FAT_FileWrite_Start:                    
;                         while(FileIndex.m < 512) {
	.dbline 198
;                                 BUFFER[FileIndex.m] = *data++;
	ldi R24,<_BUFFER
	ldi R25,>_BUFFER
	lds R30,_FileIndex
	lds R31,_FileIndex+1
	add R30,R24
	adc R31,R25
	movw R26,R10
	ld R2,X+
	movw R10,R26
	std z+0,R2
	.dbline 199
;                                 FileIndex.m++;
	lds R24,_FileIndex
	lds R25,_FileIndex+1
	adiw R24,1
	sts _FileIndex+1,R25
	sts _FileIndex,R24
	.dbline 201
;                                 //如果读取完成就退出
;                                 if(--Length == 0) {
	ldi R20,1
	ldi R21,0
	ldi R22,0
	ldi R23,0
	movw R30,R28
	ldd R2,z+10
	ldd R3,z+11
	ldd R4,z+12
	ldd R5,z+13
	sub R2,R20
	sbc R3,R21
	sbc R4,R22
	sbc R5,R23
	movw R30,R28
	std z+0,R2
	std z+1,R3
	std z+2,R4
	std z+3,R5
	movw R30,R28
	ldd R2,z+0
	ldd R3,z+1
	ldd R4,z+2
	ldd R5,z+3
	movw R30,R28
	std z+10,R2
	std z+11,R3
	std z+12,R4
	std z+13,R5
	ldi R20,0
	ldi R21,0
	ldi R22,0
	ldi R23,0
	movw R30,R28
	ldd R2,z+0
	ldd R3,z+1
	ldd R4,z+2
	ldd R5,z+3
	cp R2,R20
	cpc R3,R21
	cpc R4,R22
	cpc R5,R23
	brne L115
	.dbline 201
	.dbline 202
;                                         FAT_WriteBlock(FileIndex.LBA); //回写扇区
	lds R18,_FileIndex+8+2
	lds R19,_FileIndex+8+2+1
	lds R16,_FileIndex+8
	lds R17,_FileIndex+8+1
	xcall _FAT_WriteBlock
	.dbline 203
;                                         return;
	xjmp L97
L115:
	.dbline 205
L113:
	.dbline 197
	lds R24,_FileIndex
	lds R25,_FileIndex+1
	cpi R24,0
	ldi R30,2
	cpc R25,R30
	brsh X5
	xjmp L112
X5:
	.dbline 206
	lds R4,_FileIndex+8+2
	lds R5,_FileIndex+8+2+1
	lds R2,_FileIndex+8
	lds R3,_FileIndex+8+1
	movw R30,R28
	std z+0,R2
	std z+1,R3
	std z+2,R4
	std z+3,R5
	ldi R20,1
	ldi R21,0
	ldi R22,0
	ldi R23,0
	movw R30,R28
	ldd R2,z+0
	ldd R3,z+1
	ldd R4,z+2
	ldd R5,z+3
	add R2,R20
	adc R3,R21
	adc R4,R22
	adc R5,R23
	sts _FileIndex+8+1,R3
	sts _FileIndex+8,R2
	sts _FileIndex+8+2+1,R5
	sts _FileIndex+8+2,R4
	movw R30,R28
	ldd R16,z+0
	ldd R17,z+1
	ldd R18,z+2
	ldd R19,z+3
	xcall _FAT_WriteBlock
	.dbline 207
	ldi R20,1
	ldi R21,0
	ldi R22,0
	ldi R23,0
	lds R4,_FileIndex+2+2
	lds R5,_FileIndex+2+2+1
	lds R2,_FileIndex+2
	lds R3,_FileIndex+2+1
	add R2,R20
	adc R3,R21
	adc R4,R22
	adc R5,R23
	sts _FileIndex+2+1,R3
	sts _FileIndex+2,R2
	sts _FileIndex+2+2+1,R5
	sts _FileIndex+2+2,R4
	.dbline 208
L108:
	.dbline 193
	lds R2,_Info
	clr R3
	clr R4
	clr R5
	lds R8,_FileIndex+2+2
	lds R9,_FileIndex+2+2+1
	lds R6,_FileIndex+2
	lds R7,_FileIndex+2+1
	cp R6,R2
	cpc R7,R3
	cpc R8,R4
	cpc R9,R5
	brsh X6
	xjmp L107
X6:
	.dbline 209
L100:
	.dbline 189
	xjmp L99
X4:
	.dbline -2
L97:
	adiw R28,4
	xcall pop_gset3
	adiw R28,4
	.dbline 0 ; func end
	ret
	.dbsym r data 10 pc
	.dbsym l Data 14 pV
	.dbsym l Length 10 l
	.dbend
	.area bss(ram, con, rel)
	.dbfile D:\桌面\mp3\FAT\fat.c
_FileIndex:
	.blkb 12
	.dbstruct 0 12 .6
	.dbfield 0 m i
	.dbfield 2 i l
	.dbfield 6 ClusID i
	.dbfield 8 LBA l
	.dbend
	.dbsym s FileIndex _FileIndex S[.6]
_Info:
	.blkb 24
	.dbstruct 0 24 .5
	.dbfield 0 BPB_SecPerClus c
	.dbfield 1 BPB_RsvdSecCnt i
	.dbfield 3 BPB_NumFATs c
	.dbfield 4 BPB_RootEntCnt i
	.dbfield 6 BPB_TotSec16 i
	.dbfield 8 BPB_FATSz16 i
	.dbfield 10 BPB_HiddSec l
	.dbfield 14 DirStartSec l
	.dbfield 18 DataStartSec l
	.dbfield 22 DirSecCount i
	.dbend
	.dbsym s Info _Info S[.5]
_BUFFER:
	.blkb 512
	.dbsym s BUFFER _BUFFER A[512:512]c