/*These are the Offsets to the Variables within the Bootsector of a FAT16
Partition.
- */
+*/
;#define FAT16_BSO_SECSIZE 0x0b ; Offset to Sectorsize Word
#define FAT16_BSO_CLUSTSZ 0x0d ; Offset to Clustersize Byte
#define FAT16_BSO_RESSECT 0x0e ; Offset to Number of Reserved Sectors
#define FAT16_BSO_VOLPTR 0x1c ; Offset to First VolumeSector
#define FAT16_BSO_SECPERFAT 0x16 ; Offset to Number of Sectors per Fat
#define FAT16_BSO_NUMFATCP 0x10 ; Offset to Ammount of FAT Copys
-#define FAT16_BSO_NUMDIRENT 0x11 ; Offset to Max. Root Dir. Entrys
-#define FAT16_FIRST_IMAGENAME 'A' ; First letter of filename to search
-#define FAT16_LAST_IMAGENAME 'Z' ; Last letter of filename to
-/*
-#define FAT16_LAST_IMAGENAME 'A'+MAXDISKS-1 ; Last letter of filename to
- ; search
-*/
+#define FAT16_BSO_NUMDIRENT 0x11 ; Offset to Max. Root Dir. entries
+
+#define FAT16_FIRST_IMAGENAME 'A' /* First letter of filename to search */
+#define FAT16_LAST_IMAGENAME 'Z' /* Last letter of filename to */
+#define FAT16_IMAGENAME_PREFIX "CPMDSK_"
+#define FAT16_IMAGENAME_SUFFIX "IMG"
; ############################################################################
; Start of Data Segment
; ############################################################################
+
.dseg
fat_partfound: .byte 1 ; (partition: 0= no found 0xff=found )
fat_parttbl: .byte 4 ; first fat16 partition entry
; only startsector is needed
fat_clustersize: .byte 1 ; sectors per cluster
-fat_numdirentrys:.byte 2 ; Max. num. of entrys within Rootdirektory
+fat_numdirentries:.byte 2 ; Max. num. of entries within Rootdirektory
fat_ptr2fat: .byte 4 ; pointer to the first fat sector
fat_ptr2dat: .byte 4 ; pointer to the first data sector
thats been searched vor. To save some of the valuabe SRAM- Space these
variables also are used as temporary variables by the function
fat_scan_partition.
- */
+*/
fat_last_dsk: .byte 1 ; number of disk with entry in cache
fat_log_clust: .byte 2 ; last searched logical cluster
fat_clust_offset: .byte 1 ; offset within the cluster
; later scanning of the Partition. See Function "fat_scan_partition"
; for more information.
; ============================================================================
+
fat_add_partition:
.if FAT16_DEBUG > 0
.if FAT16_DEBUG > 0
- printstring "free entrys in ptable ?"
+ printstring "free entries in ptable ?"
printnewline
.endif
-; Check for free Entrys in Partition table
+; Check for free entries in partition table
lds yl,ndisks
cpi yl,MAXDISKS
breq fat_scan_error
.if FAT16_DEBUG > 0
printstring "Sectors per Cluster "
- rcall printhex
+ lcall printhex
printnewline
.endif
.if FAT16_DEBUG > 0
printstring "Ammount of FAT copies: "
- rcall printhex
+ lcall printhex
printnewline
.endif
-; get max num of entrys in root direktory from bootblock
+; get max num of entries in root direktory from bootblock
ldiw z,hostbuf+FAT16_BSO_NUMDIRENT
ld temp,z+
- sts fat_numdirentrys,temp ; low byte
+ sts fat_numdirentries,temp ; low byte
ld temp2,z
- sts fat_numdirentrys+1,temp2 ; high byte
+ sts fat_numdirentries+1,temp2 ; high byte
.if FAT16_DEBUG > 0
- printstring "Max. entrys in Rootdir.: "
- rcall printhexw
+ printstring "Max. entries in rootdir.: "
+ lcall printhexw
printnewline
.endif
ldd yh,z+3
printstring "Begin of Volume at: "
- mov temp ,yl
- mov temp2,yh
- rcall printhexw
- mov temp ,xl
- mov temp2,xh
- rcall printhexw
+ movw temp ,y
+ lcall printhexw
+ movw temp ,x
+ lcall printhexw
printnewline
.endif
.if FAT16_DEBUG > 0
printstring "Sectors per FAT__: "
- rcall printhexw
+ lcall printhexw
printnewline
.endif
.if FAT16_DEBUG > 1
printstring "Begin of FAT at___: "
- mov temp ,yl
- mov temp2,yh
- rcall printhexw
- mov temp ,xl
- mov temp2,xh
- rcall printhexw
+ movw temp ,y
+ lcall printhexw
+ movw temp ,x
+ lcall printhexw
printnewline
.endif
.if FAT16_DEBUG > 1
printstring "Begin of DIR at___: "
- mov temp ,yl
- mov temp2,yh
- rcall printhexw
- mov temp ,xl
- mov temp2,xh
- rcall printhexw
+ movw temp ,y
+ lcall printhexw
+ movw temp ,x
+ lcall printhexw
printnewline
.endif
; Calculate begin of DATA Clusters within the Volume
-; Num. Dir.Sektors = (Num. of Dir. Entrys * 32) / Bytes per Sektor
+; Num. Dir.Sektors = (Num. of Dir. entries * 32) / Bytes per Sektor
-; Sectorsize is fixed at 512 Bytes, makes 16 Entrys per Sektor
+; Sectorsize is fixed at 512 bytes, makes 16 entries per sector
- lds zl,fat_numdirentrys ; low byte
- lds zh,fat_numdirentrys+1 ; high byte
+ lds zl,fat_numdirentries ; low byte
+ lds zh,fat_numdirentries+1 ; high byte
-; Num. Direntrys / 16
+; Num. Direntries / 16
lsr zh
ror zl
lsr zh
.if FAT16_DEBUG > 1
printstring "Begin of Data at__: "
- mov temp ,yl
- mov temp2,yh
- rcall printhexw
- mov temp ,xl
- mov temp2,xh
- rcall printhexw
+ movw temp ,y
+ lcall printhexw
+ movw temp ,x
+ lcall printhexw
printnewline
.endif
sts fat_clust_offset,temp
; Init counter for number of entry left to scan
- lds temp,fat_numdirentrys
+ lds temp,fat_numdirentries
sts fat_log_clust ,temp
- lds temp,fat_numdirentrys+1
+ lds temp,fat_numdirentries+1
sts fat_log_clust+1,temp
fat_next_sector_loop:
clr temp
ret
-; Looks at a read directory block for image entrys
+; Looks at a read directory block for image entries
fat_look_for_images:
ldiw z,hostbuf
adiw z,32
inc temp2
- cpi temp2,16 ; max entrys/sector
+ cpi temp2,16 ; max entries/sector
breq fat_scan_next_sector
rjmp fat_look_for_loop
; Found a valid image
.if FAT16_DEBUG > 1
printstring "Found a valid Image! Z="
- mov temp ,zl
- mov temp2,zh
- rcall printhexw
+ movw temp ,z
+ lcall printhexw
printnewline
.endif
ldd zl,z+0x1F
; mov zh,_0
+ clc
cpse _tmp0,_0 ;round up
adiw x,1
adc zl,_0
.if FAT16_DEBUG > 1
; Test finding of the first sector
- ldd xl,z+0x1A
- ldd xh,z+0x1B
+ ldd xl,y+1
+ ldd xh,y+2
rcall fat_gethostsec
- printstring "Begin of Image at: "
- mov temp ,yl
- mov temp2,yh
- rcall printhexw
- mov temp ,xl
- mov temp2,xh
- rcall printhexw
+ printstring "Begin of image at: "
+ movw temp ,y
+ lcall printhexw
+ movw temp ,x
+ lcall printhexw
printnewline
.endif
ldd yh,z+2
.if FAT16_DBG_FAT > 0
- printstring "Search log. Cluster "
- mov temp,xl
- mov temp2,xh
+ printstring "Search log. cluster "
+ movw temp,x
lcall printhexw
printnewline
- printstring "Search phys. Cluster "
- mov temp ,yl
- mov temp2,yh
+ printstring "Search phys. cluster "
+ movw temp ,y
lcall printhexw
printnewline
.endif
breq fat_found_phsy_clust
; Get Next Cluster from Fat
-; Trick: 512 Bytes Per Sector equals to 256 FAT- Entrys per Sector
+; Trick: 512 Bytes Per Sector equals to 256 FAT- entries per Sector
; so given: yl is the Offset within the FAT Sector
-; yh is the number off se FAT sector to Read
+; yh is the number off the FAT sector to Read
; in zh,zl: Pointer to Word within the Sector to read
; in yh..xl: Start sector number (LBA)
; Create FAT Offset Value
clr zh
- mov zl,yl
+ mov zl,yl
lsl zl
rol zh
; Get FAT Start
- mov temp,yh
+ mov temp,yh
lds xl,fat_ptr2fat
lds xh,fat_ptr2fat+1
lds yl,fat_ptr2fat+2
pop xh
pop xl
- mov yl,zl
- mov yh,zh
+ movw y,z
; Check next logical Cluster
ldi zl,1
.if FAT16_DBG_FAT > 0
printstring "Found phys. Cluster at:"
- mov temp,yl
- mov temp2,yh
+ movw temp,y
lcall printhexw
printnewline
.endif
; ################# Get logical Number of Cluster within the imagefile
; printstring "calc log sector"
; Get logical Sectornumber from temp
- mov xl,temp
- mov xh,temp2
+ movw x,temp
mov yl,_0
mov yh,_0
; Divide logical Sectornumber by size of Cluster in sectors
; [out] hostbuf Sector read by this routine
; ----------------------------------------------------------------------------
; Description:
-; This Routine reads a Sector from the Imagefile inside an FAT16 Partition.
+; This Routine reads a Sector from the Imagefile inside a FAT16 Partition.
; ============================================================================
fat_readhost:
projects / avrcpm.git / blobdiff