; along with this program. If not, see <http://www.gnu.org/licenses/>.
; ===========================================================
-; ABOUT INIT SD_CARD AND HOW TO SELECT FAT16/FAT32 FORMATTING
+; ABOUT INIT SD_CARD AND HOW TO SELECT FAT16/FAT32 FORMAT
; ===========================================================
-; FAT16/FAT32 selection is done via the ID of partition in EBP, because SD must be always FAT16 and SDHC must be always FAT32
-; So we assume that the SD_Card FAT16/FAT32 formatting was done well !
-
+; FAT16/FAT32 selection is made via the ID of partition in EBP
+; because SD must be always FAT16 and SDHC must be always FAT32
+; this is automatically done when we format the SD_Card !
+
+
+; =====================================================================
+; goal : accept 64 MB up to 64 GB SD_CARD
+; =====================================================================
+; thus FAT and RootClus logical sectors are word addressable.
+
+; FAT is a little endian structure.
+; CMD frame is sent as big endian.
+
+; we assume that SDSC Card (up to 2GB) is FAT16 with a byte addressing
+; and that SDHC Card (4GB up to 64GB) is FAT32 with a sector addressing (sector = 512 bytes)
+; for SDHC Card = 64 GB, cluster = 64 sectors ==> max clusters = 20 0000h ==> FAT size = 16384 sectors
+; ==> FAT1 and FAT2 can be addressed with a single word.
+
+; ref. https://en.wikipedia.org/wiki/Extended_boot_record
+; ref. https://en.wikipedia.org/wiki/Partition_type
+
+; Formatage FA16 d'une SDSC Card 2GB
+; First sector of physical drive (sector 0) content :
+; ---------------------------------------------------
+; dec@| HEX@
+; 446 |0x1BE : partition table first record ==> logical drive 0
+; 462 |0x1CE : partition table 2th record ==> logical drive 1
+; 478 |0x1DE : partition table 3th record ==> logical drive 2
+; 494 |0x1EE : partition table 4th record ==> logical drive 3
+
+; partition of first record content :
+; ---------------------------------------------------
+; 450 |0x1C2 = 0x0E : type FAT16 using LBA addressing
+; 454 |0x1C6 = 89 00 00 00 : FirstSector (of logical drive 0) BS_FirstSector = 137
+
+
+; Partition type Description
+; 0 empty / unused
+; 1 FAT12
+; 4 FAT16 for partitions <= 32 MiB
+; 5 extended partition
+; 6 FAT16 for partitions > 32 MiB
+; 11 FAT32 for partitions <= 2 GiB
+; 12 Same as type 11 (FAT32), but using LBA addressing, which removes size constraints
+; 14 Same as type 6 (FAT16), but using LBA addressing
+; 15 Same as type 5, but using LBA addressing
+; ref. https://www.compuphase.com/mbr_fat.htm#BOOTSECTOR
+
+; FirstSector of logical drive (sector 0) content :
+; -------------------------------------------------
+; dec@| HEX@ = HEX decimal
+; 11 | 0x0B = 00 02 : 512 bytes/sector BPB_BytsPerSec = 512
+; 13 | 0x0D = 40 : 64 sectors/cluster BPB_SecPerClus = 64
+; 14 | 0x0E = 01 00 : 2 reserved sectors BPB_RsvdSecCnt = 1
+; 16 | 0x10 = 02 : 2 FATs BPB_NumFATs = 2 (always 2)
+; 17 | 0x11 = 00 02 : 512 entries/directory BPB_RootEntCnt = 512
+; 19 | 0x13 = 00 00 : BPB_TotSec16 (if < 65535) BPB_TotSec16 = 0
+; 22 | 0x16 = EB 00 : 235 sectors/FAT (FAT16) BPB_FATSize = 235
+; 32 | 0x20 = 77 9F 3A 00 : 3841911 total sectors BPB_TotSec32 = 3841911
+; 54 | 0x36 = "FAT16" BS_FilSysType (not used)
+
+; all values below are evaluated in logical sectors
+; FAT1 = BPB_RsvdSecCnt = 1
+; FAT2 = BPB_RsvdSecCnt + BPB_FATSz32 = 1 + 235 = 236
+; OrgRootDirL = BPB_RsvdSecCnt + (BPB_FATSize * BPB_NumFATs) = 471
+; RootDirSize = BPB_RootEntCnt * 32 / BPB_BytsPerSec = 32 sectors
+; OrgDatas = OrgRootDir + RootDirSize = 503
+; OrgCluster = OrgRootDir - 2*BPB_SecPerClus = 375 (virtual value)
+; FirstSectorOfCluster(n) = OrgCluster + n*BPB_SecPerClus ==> cluster(3) = 705
+
+; ====================================================================================
+
+; Formatage FA32 d'une SDSC Card 8GB
+; First sector of physical drive (sector 0) content :
+; ---------------------------------------------------
+; dec@| HEX@
+; 446 |0x1BE : partition table first record ==> logical drive 0
+; 462 |0x1CE : partition table 2th record ==> logical drive 1
+; 478 |0x1DE : partition table 3th record ==> logical drive 2
+; 494 |0x1EE : partition table 4th record ==> logical drive 3
+
+; partition record content :
+; ---------------------------------------------------
+; 450 |0x1C2 = 0x0C : type FAT32 using LBA addressing
+; 454 |0x1C6 = 00 20 00 00 : FirstSector (of logical drive 0) = BS_FirstSector = 8192
+
+;
+; FirstSector of logical block (sector 0) content :
+; -------------------------------------------------
+; dec@| HEX@ = HEX decimal
+; 11 | 0x0B = 00 02 : 512 bytes/sector BPB_BytsPerSec = 512
+; 13 | 0x0D = 08 : 8 sectors/cluster BPB_SecPerClus = 8
+; 14 | 0x0E = 20 00 : 32 reserved sectors BPB_RsvdSecCnt = 32
+; 16 | 0x10 = 02 : 2 FATs BPB_NumFATs = 2 (always 2)
+; 17 | 0x11 = 00 00 : 0 BPB_RootEntCnt = 0 (always 0 for FAT32)
+
+; 32 | 0x20 = 00 C0 EC 00 : BPB_TotSec32 BPB_TotSec32 = 15515648
+; 36 | 0x24 = 30 3B 00 00 : BPB_FATSz32 BPB_FATSz32 = 15152
+; 40 | 0x28 = 00 00 : BPB_ExtFlags BPB_ExtFlags
+; 44 | 0x2C = 02 00 00 00 : BPB_RootClus BPB_RootClus = 2
+; 48 | 0x30 = 01 00 : BPB_FSInfo BPB_FSInfo = 1
+; 50 | 0x33 = 06 00 : BPB_BkBootSec BPB_BkBootSec = 6
+; 82 | 0x52 = "FAT32" : BS_FilSysType BS_FilSysType (not used)
+
+;
+; all values below are evaluated in logical sectors
+; FAT1 = BPB_RsvdSecCnt = 32
+; FAT2 = BPB_RsvdSecCnt + BPB_FATSz32 = 32 + 15152 = 15184
+; OrgRootDirL = BPB_RsvdSecCnt + BPB_FATSz32 * BPB_NumFATs = 32 + 15152*2 = 30336
+; OrgCluster = OrgRootDir - 2*BPB_SecPerClus = 30320
+; RootDirSize = BPB_RootEntCnt * 32 / BPB_BytsPerSec = 0
+; OrgDatas = OrgRootDir + RootDirSize = 30336
+; FirstSectorOfCluster(n) = OrgCluster + n*BPB_SecPerClus ==> cluster(6) = 30368
; ===========================================================
-; 1- Init eUSCI dedicated to SD_Card SPI driver
+; 0- Init FRAM SD datas, case of MSP430FR57xx
; ===========================================================
- MOV #0A981h,&SD_CTLW0 ; UCxxCTL1 = CKPH, MSB, MST, SPI_3, SMCLK + UCSWRST
- MOV #FREQUENCY*3,&SD_BRW ; UCxxBRW init SPI CLK = 333 kHz ( < 400 kHz) for SD_Card init
-
-
- .IFDEF MSP_EXP430FR5739
-
-; COLD default state : Px{DIR,SEL0,SEL1,SELC,IE,IFG,IV} = 0 ; PX{OUT,REN} = 1 ; Px{IN,IES} = ?
-
-; P2.2 - RF.16 <--- CD SD_CardAdapter (Card Detect)
-SD_CD .equ 4
-SD_CDIN .equ P2IN
-; P2.3 - RF.10 ---> CS SD_CardAdapter (Card Select)
-SD_CS .equ 8
-SD_CSOUT .equ P2OUT
- BIS.B #SD_CS,&P2DIR ; SD_CS output high
-
-; P2.4 - RF.14 UCA1 CLK ---> CLK SD_CardAdapter (SCK)
-; P2.5 - RF.7 UCA1 TXD/SIMO ---> SDI SD_CardAdapter (MOSI)
-; P2.6 - RF.5 UCA1 RXD/SOMI <--- SDO SD_CardAdapter (MISO)
- BIS.B #070h,&P2SEL1 ; Configure UCA1 pins P2.4 as UCA1CLK, P2.5 as UCA1SIMO & P2.6 as UCA1SOMI
- ; P2DIR.x is controlled by eUSCI_A0 module
- BIC.B #070h,&P2REN ; disable pullup resistors for SIMO/SOMI/SCK pins
-
- .ENDIF
- .IFDEF MSP_EXP430FR5969
-
-; COLD default state : Px{DIR,SEL0,SEL1,SELC,IE,IFG,IV} = 0 ; PX{OUT,REN} = 1 ; Px{IN,IES} = ?
-
-; P4.2 <--- SD_CD (Card Detect)
-SD_CD .equ 4
-SD_CDIN .equ P4IN
-; P4.3 ---> SD_CS (Card Select)
-SD_CS .equ 8
-SD_CSOUT .equ P4OUT
- BIS.B #SD_CS,&P4DIR ; SD_CS output high
-
-; P2.4 UCA1 CLK ---> SD_CLK
-; P2.5 UCA1 TX/SIMO ---> SD_SDI
-; P2.6 UCA1 RX/SOMI <--- SD_SDO
- BIS.B #070h, &P2SEL1 ; Configure UCA1 pins P2.4 as UCA1CLK, P2.5 as UCA1SIMO & P2.6 as UCA1SOMI
- ; P2DIR.x is controlled by eUSCI_A0 module
- BIC.B #070h, &P2REN ; disable pullup resistors for SIMO/SOMI/SCK pins
-
- .ENDIF
- .IFDEF MSP_EXP430FR5994
-
-; COLD default state : Px{DIR,SEL0,SEL1,SELC,IE,IFG,IV} = 0 ; PX{OUT,REN} = 1 ; Px{IN,IES} = ?
-
-; P7.2/UCB2CLK - SD_CD (Card Detect)
-SD_CD .equ 4 ; P7.2
-SD_CDIN .equ P7IN
-; P4.0/A8 - SD_CS (Card Select)
-SD_CS .equ 1 ; P4.0
-SD_CSOUT .equ P4OUT
- BIS.B #SD_CS,&P4DIR ; SD_CS output high
-
-; P2.2/TB0.2/UCB0CLK - SD_CLK
-; P1.6/TB0.3/UCB0SIMO/UCB0SDA/TA0.0 - SD_SDI
-; P1.7/TB0.4/UCB0SOMI/UCB0SCL/TA1.0 - SD_SDO
- BIS #04C0h,&PASEL1 ; Configure UCB0 pins P1.6 as UCB0SIMO, P1.7 as UCB0SOMI& UCB0 pins P2.2 as UCB0CLK
- ; PxDIR.x is controlled by eUSCI_A0 module
- BIC #04C0h,&PAREN ; disable pullup resistors for SIMO/SOMI/SCK pins
-
- .ENDIF
- .IFDEF MSP_EXP430FR6989
-
-; COLD default state : Px{DIR,SEL0,SEL1,SELC,IE,IFG,IV} = 0 ; PX{OUT,REN} = 1 ; Px{IN,IES} = ?
-
-; P2.7 <--- SD_CD (Card Detect)
-SD_CD .equ 80h
-SD_CDIN .equ P2IN
-; P2.6 ---> SD_CS (Card Select)
-SD_CS .equ 40h
-SD_CSOUT .equ P2OUT
- BIS.B #SD_CS,&P2DIR ; SD_CS output high
-
-; P2.2 UCA0 CLK ---> SD_CLK
-; P2.0 UCA0 TX/SIMO ---> SD_SDI
-; P2.2 UCA0 RX/SOMI <--- SD_SDO
- BIS.B #007h,&P2SEL0 ; Configure UCA1 pins P2.2 as UCA0CLK, P2.0 as UCA0SIMO & P2.1 as UCA0SOMI
- ; P2DIR.x is controlled by eUSCI_A0 module
- BIC.B #007h,&P2REN ; disable pullup resistors for SIMO/SOMI/SCK pins
-
- .ENDIF
- .IFDEF MSP_EXP430FR4133
-
-; COLD default state : Px{DIR,SEL0,SEL1,SELC,IE,IFG,IV} = 0 ; PX{OUT,REN} = 1 ; Px{IN,IES} = ?
-
-; P8.0 <--- SD_CD (Card Detect)
-SD_CD .equ 1
-SD_CDIN .equ P8IN
-; P8.1 ---> SD_CS (Card Select)
-SD_CS .equ 2
-SD_CSOUT .equ P8OUT
- BIS.B #SD_CS,&P8DIR ; SD_CS output high
-
-; P5.1 UCB0 CLK ---> SD_CLK
-; P5.2 UCB0 TX/SIMO ---> SD_SDI
-; P5.3 UCB0 RX/SOMI <--- SD_SDO
- BIS.B #00Eh,&P5SEL0 ; Configure UCB0 pins P5.1 as CLK, P5.2 as SIMO & P5.3 as SOMI
- ; P2DIR.x is controlled by eUSCI_A0 module
- BIC.B #00Eh,&P5REN ; disable pullup resistors for SIMO/SOMI/SCK pins
-
- .ENDIF
- .IFDEF CHIPSTICK_FR2433
-
-; COLD default state : Px{DIR,SEL0,SEL1,SELC,IE,IFG,IV} = 0 ; PX{OUT,REN} = 1 ; Px{IN,IES} = ?
-
-; P2.3 <--- SD_CD (Card Detect)
-SD_CD .equ 8
-SD_CDIN .equ P2IN
-; P2.2 ---> SD_CS (Card Select)
-SD_CS .equ 4
-SD_CSOUT .equ P2OUT
- BIS.B #SD_CS,&P2DIR ; SD_CS output high
-
-; P1.1 UCB0 CLK ---> SD_CLK
-; P1.2 UCB0 TX/SIMO ---> SD_SDI
-; P1.3 UCB0 RX/SOMI <--- SD_SDO
- BIS.B #00Eh,&P1SEL0 ; Configure UCB0 pins P1.1 as CLK, P1.2 as SIMO & P1.3 as SOMI
- ; P1DIR.x is controlled by eUSCI_B0 module
- BIC.B #00Eh,&P1REN ; disable pullup resistors for SIMO/SOMI/SCK pins
-
- .ENDIF
- .IFDEF MY_MSP430FR5738
-
-; COLD default state : Px{DIR,SEL0,SEL1,SELC,IE,IFG,IV} = 0 ; PX{OUT,REN} = 1 ; Px{IN,IES} = ?
-
-; P2.3 as SD_CD
-SD_CD .equ 08h
-SD_CDIN .equ P2IN
-; P2.4 as SD_CS
-SD_CS .equ 10h
-SD_CSOUT .equ P2OUT
- BIS.B #SD_CS,&P2DIR ; SD_CS output high
-
-; P2.2/UCB0CLK ---> SD_CardAdapter CLK (SCK) default value
-; P1.6/UCB0SIMO/UCB0SDA/TA0.0 ---> SD_CardAdapter SDI (MOSI) default value
-; P1.7/UCB0SOMI/UCB0SCL/TA1.0 <--- SD_CardAdapter SDO (MISO) default value
- BIS #04C0h,&PASEL1 ; Configure UCB0 pins P2.2 as UCB0CLK, P1.6 as UCB0SIMO & P1.7 as UCB0SOMI
- ; P2DIR.x is controlled by eUSCI_B0 module
- BIC #04C0h,&PAREN ; disable pullup resistors for SIMO/SOMI/CLK pins
-
- .ENDIF
- .IFDEF MY_MSP430FR5738_1
-
-; COLD default state : Px{DIR,SEL0,SEL1,SELC,IE,IFG,IV} = 0 ; PX{OUT,REN} = 1 ; Px{IN,IES} = ?
-
-; P2.3 as SD_CD
-SD_CD .equ 08h
-SD_CDIN .equ P2IN
-; P2.4 as SD_CS
-SD_CS .equ 10h
-SD_CSOUT .equ P2OUT
- BIS.B #SD_CS,&P2DIR ; SD_CS output high
-
-; P2.2/UCB0CLK ---> SD_CardAdapter CLK (SCK) default value
-; P1.6/UCB0SIMO/UCB0SDA/TA0.0 ---> SD_CardAdapter SDI (MOSI) default value
-; P1.7/UCB0SOMI/UCB0SCL/TA1.0 <--- SD_CardAdapter SDO (MISO) default value
- BIS #04C0h,&PASEL1 ; Configure UCB0 pins P2.2 as UCB0CLK, P1.6 as UCB0SIMO & P1.7 as UCB0SOMI
- ; P2DIR.x is controlled by eUSCI_B0 module
- BIC #04C0h,&PAREN ; disable pullup resistors for SIMO/SOMI/CLK pins
-
- .ENDIF
- .IFDEF MY_MSP430FR5948
-
-; COLD default state : Px{DIR,SEL0,SEL1,SELC,IE,IFG,IV} = 0 ; PX{OUT,REN} = 1 ; Px{IN,IES} = ?
-
-; P2.3 <--- SD_CD (Card Detect)
-SD_CD .equ 08h
-SD_CDIN .equ P2IN
-; P2.7 ---> SD_CS (Card Select)
-SD_CS .equ 80h
-SD_CSOUT .equ P2OUT
- BIS.B #SD_CS,&P2DIR ; SD_CS output high
-
-; P2.4 UCA1 CLK ---> SD_CLK
-; P2.5 UCA1 TX/SIMO ---> SD_SDI
-; P2.6 UCA1 RX/SOMI <--- SD_SDO
- BIS.B #070h,&P2SEL1 ; Configure UCA1 pins P2.4 as UCA1CLK, P2.5 as UCA1SIMO & P2.6 as UCA1SOMI
- ; P2DIR.x is controlled by eUSCI_A0 module
- BIC.B #070h,&P2REN ; disable pullup resistors for SIMO/SOMI/SCK pins
-
- .ENDIF
- .IFDEF MY_MSP430FR5948_1 ; = new version of MY_MSP430FR5948
-
-; COLD default state : Px{DIR,SEL0,SEL1,SELC,IE,IFG,IV} = 0 ; PX{OUT,REN} = 1 ; Px{IN,IES} = ?
-
-; P2.7 ---> SD_CD (Card Detect)
-SD_CD .equ 80h
-SD_CDIN .equ P2IN
-; P2.3 <--- SD_CS (Card Select)
-SD_CS .equ 08h
-SD_CSOUT .equ P2OUT
- BIS.B #SD_CS,&P2DIR ; SD_CS output high
-
-; P2.4 UCA1 CLK ---> SD_CLK
-; P2.5 UCA1 TX/SIMO ---> SD_SDI
-; P2.6 UCA1 RX/SOMI <--- SD_SDO
- BIS.B #070h,&P2SEL1 ; Configure UCA1 pins P2.4 as UCA1CLK, P2.5 as UCA1SIMO & P2.6 as UCA1SOMI
- ; P2DIR.x is controlled by eUSCI_A0 module
- BIC.B #070h,&P2REN ; disable pullup resistors for SIMO/SOMI/SCK pins
-
+ .IFDEF RAM_1K ; case of MSP430FR57xx : SD datas are in FRAM
+ MOV #SD_LEN_DATA,X ; so are not initialised by COLD/RESET
+InitSDdata ;
+ SUB #2,X
+ MOV #0,SD_ORG_DATA(X) ;
+ JNZ InitSDdata ;
.ENDIF
- BIC #1,&SD_CTLW0 ; release eUSCI from reset
-
; ===========================================================
-; 2- Init to 0 all SD_Card variables, handles and SDIB buffer
+; 1- Init eUSCI dedicated to SD_Card SPI driver
; ===========================================================
-InitSDdata
- MOV #SD_ORG_DATA,X ;
-InitSDdataLoop ;
- MOV #0,0(X) ;
- ADD #2,X ;
- CMP #SD_END_DATA,X ;
- JNE InitSDdataLoop ;
-
+ MOV #0A981h,&SD_CTLW0 ; UCxxCTL1 = CKPH, MSB, MST, SPI_3, SMCLK + UCSWRST
+ MOV #FREQUENCY*3,&SD_BRW ; UCxxBRW init SPI CLK = 333 kHz ( < 400 kHz) for SD_Card init
+ BIS.B #SD_CS,&SD_CSDIR ; SD_CS as output high
+ BIS #SD_BUS,&SD_SEL ; Configure pins as SIMO, SOMI & SCK (PxDIR.y are controlled by eUSCI module)
+; BIC #SD_BUS,&SD_REN ; disable pullup resistors for SIMO/SOMI/SCK pins
+ BIC #1,&SD_CTLW0 ; release eUSCI from reset
; ===========================================================
-; 3- Init SD_Card
+; 2- Init SD_Card
; ===========================================================
SD_POWER_ON
BIC.B #SD_CS,&SD_CSOUT ; preset SD_CS output low to switch in SPI mode
MOV #4,S ; preset error 4R1
; ----------------------------------;
-INIT_CMD0 ;
+INIT_CMD0 ; all SD area is 0 filled
; ----------------------------------;
MOV #95h,&SD_CMD_FRM ; $(95 00 00 00 00 00)
MOV #4000h,&SD_CMD_FRM+4 ; $(95 00 00 00 00 40); send CMD0
; ----------------------------------;
-SEND_CMD0 ; CMD0 : GO_IDLE_STATE
+SEND_CMD0 ; CMD0 : GO_IDLE_STATE expected SPI_R1 response = 1 = idle state
; ----------------------------------;
- MOV #1,W ; expected SPI_R1 response = 1 = idle state
- CALL #sendCommand ;X
+ CALL #sendCommandIdleRet ;X
JZ INIT_CMD8 ; if idle state
SD_INIT_ERROR ;
MOV #SD_CARD_ERROR,PC ; ReturnError = $04R1, case of defectuous card (or insufficient SD_POWER_ON clk)
; ----------------------------------;
-INIT_CMD8 ; mandatory if SD_Card >= V2.x [11:8]supply voltage(VHS)
+INIT_CMD8 ; mandatory if SD_Card >= V2.x [11:8]supply voltage(VHS)
; ----------------------------------;
CALL #SPI_GET ; (needed to pass SanDisk ultra 8GB "HC I")
CMP.B #-1,W ; FFh expected value <==> MISO = high level
MOV #1,&SD_CMD_FRM+2 ; $(87 AA 01 00 ...) (CRC:CHECK PATTERN:VHS set as 2.7to3.6V:0)
MOV #4800h,&SD_CMD_FRM+4 ; $(87 AA 01 00 00 48)
; ----------------------------------;
-SEND_CMD8 ; CMD8 = SEND_IF_COND
+SEND_CMD8 ; CMD8 = SEND_IF_COND; expected R1 response (first byte of SPI R7) = 01h : idle state
; ----------------------------------;
- MOV #1,W ; expected R1 response (first byte of SPI R7) = 01h : idle state
- CALL #sendCommand ; time out occurs with SD_Card V1.x (and all MMC_card)
+ CALL #sendCommandIdleRet ;X time out occurs with SD_Card V1.x (and all MMC_card)
; ----------------------------------;
MOV #4,X ; skip end of SD_Card V2.x type R7 response (4 bytes), because useless
CALL #SPI_X_GET ;WX
; ----------------------------------;
-INIT_ACMD41 ;
+INIT_ACMD41 ; no more CRC needed from here
; ----------------------------------;
MOV #1,&SD_CMD_FRM ; $(01 00 ... set stop bit
MOV #0,&SD_CMD_FRM+2 ; $(01 00 00 00 ...
; MOV.B #16,Y ; init 16 * ACMD41 repeats (power on fails with SanDisk ultra 8GB "HC I" and Transcend 2GB)
-; MOV.B #32,Y ; init 32 * ACMD41 repeats ==> ~400ms
- MOV.B #-1,Y ; init 255 * ACMD41 repeats ==> 3 s
+; MOV.B #32,Y ; init 32 * ACMD41 repeats ==> ~400ms time out
+ MOV.B #-1,Y ; init 255 * ACMD41 repeats ==> ~3 s time out
; ----------------------------------;
SEND_ACMD41 ; send CMD55+CMD41
; ----------------------------------;
MOV #8,S ; preset error 8R1 for ACMD41
INIT_CMD55 ;
MOV #7700h,&SD_CMD_FRM+4 ; $(01 00 00 00 00 77)
-SEND_CMD55 ; CMD55 = APP_CMD
- MOV #1,W ; expected R1 response = 1 : idle
- CALL #sendCommand ;
+SEND_CMD55 ; CMD55 = APP_CMD; expected SPI_R1 response = 1 : idle
+ CALL #sendCommandIdleRet ;X
SEND_CMD41 ; CMD41 = APP OPERATING CONDITION
MOV #6940h,&SD_CMD_FRM+4 ; $(01 00 00 00 40 69) (30th bit = HCS = High Capacity Support request)
CALL #WaitIdleBeforeSendCMD ; wait until idle (needed to pass SanDisk ultra 8GB "HC I") then send Command CMD41
Read_EBP_FirstSector ; W=0, BS_FirstSectorHL=0
; ----------------------------------;
CALL #readSectorW ; read physical first sector
- MOV #BUFFER,Y ;
+ MOV #SD_BUF,Y ;
MOV 454(Y),&BS_FirstSectorL ; so, sectors become logical
MOV 456(Y),&BS_FirstSectorH ;
MOV.B 450(Y),W ; W = partition ID
MOV #1,&FATtype ; preset FAT16
FAT16_CHS_LBA_Test ;
SUB.B #6,W ; ID=06h Partition FAT16 using CHS & LBA ?
- JZ Read_MBR_FirstSector ; with W = 0
+ JZ Read_MBR_FirstSector ; W = 0
FAT16_LBA_Test ;
SUB.B #8,W ; ID=0Eh Partition FAT16 using LBA ?
- JZ Read_MBR_FirstSector ; with W = 0
+ JZ Read_MBR_FirstSector ; W = 0
; ----------------------------------;
MOV #2,&FATtype ; set FAT32
FAT32_LBA_Test ;
ADD.B #2,W ; ID=0Ch Partition FAT32 using LBA ?
- JZ Read_MBR_FirstSector ; with W = 0
+ JZ Read_MBR_FirstSector ; W = 0
FAT32_CHS_LBA_Test ;
ADD.B #1,W ; ID=0Bh Partition FAT32 using CHS & LBA ?
- JZ Read_MBR_FirstSector ; with W = 0
+ JZ Read_MBR_FirstSector ; W = 0
ADD #0200Bh,W ;
MOV W,S ;
MOV #SD_CARD_ID_ERROR,PC ; S = ReturnError = $20xx with xx = partition ID
; ----------------------------------; see: https://en.wikipedia.org/wiki/Partition_type
Read_MBR_FirstSector ; read first logical sector
; ----------------------------------;
- CALL #readSectorW ; ...with the good CMD17 bytes/sectors (FAT16/FAT32) frame !
+ CALL #readSectorW ; ...with the good CMD17 bytes/sectors frame ! (good switch FAT16/FAT32)
; ----------------------------------;
FATxx_SetFileSystem ;
; ----------------------------------;
MOV X,&OrgClusters ; X = virtual cluster 0 address (clusters 0 and 1 don't exist)
MOV &FATtype,&DIRClusterL ; init DIRcluster as RootDIR
; ----------------------------------;
- .IFNDEF RAM_1K ;
-; ----------------------------------;
-INIT_LOADSATCK ; Load" IP return stack
-; ----------------------------------;
- MOV #LOAD_STACK,&LOADPTR ;
-; ----------------------------------;
- .ENDIF
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