more work on SD card support

src/aliases/,aliases_hardware_m65.s

@@ -66,4 +66,30 @@
 	!set __SID_R2_OFFSET = $20 ; right SID 2, $D420
 	!set __SID_L1_OFFSET = $40 ; left  SID 1, $D440
 	!set __SID_L2_OFFSET = $60 ; left  SID 2, $D460
+
+
+
+	; SD card commands
+	;
+	; XXX command codes taken from XEMU emulator, to be updated when official documentation exists
+
+	!set CARD_CMD_RESET        = $00 ; reset SD card
+	!set CARD_CMD_RESET_FL     = $10 ; reset with flags, XXX what's this?
+	!set CARD_CMD_END_RESET    = $01 ; end reset
+	!set CARD_CMD_END_RESET_FL = $11 ; end reset with flags
+	!set CARD_CMD_READ         = $02 ; read sector
+	!set CARD_CMD_WRITE        = $03 ; write sector
+	!set CARD_CMD_WRITE_1      = $04 ; multi-sector write, 1st sector
+	!set CARD_CMD_WRITE_2      = $05 ; multi-sector write
+	!set CARD_CMD_WRITE_3      = $06 ; multi-sector write, last sector
+	!set CARD_CMD_FLUSH        = $0C
+	!set CARD_CMD_SDHC_OFF     = $40 ; for older cores only?
+	!set CARD_CMD_SDHC_ON      = $41 ; for older cores only?
+	                                 ; XXX $44, $45 - completely unclear to me
+	!set CARD_CMD_MAP_BUF      = $81
+	!set CARD_CMD_UNMAP_BUF    = $82
+	!set CARD_CMD_FILL_ON      = $83
+	!set CARD_CMD_FILL_OFF     = $84
+	!set CARD_CMD_SELECT_INT   = $C0 ; select internal slot
+	!set CARD_CMD_SELECT_EXT   = $C1 ; select external slot
 }

src/dos_m65/sdcard/sdcard_helpers.s

@@ -54,13 +54,38 @@ sdcard_set_addr_sdsc:
 	lda CARD_SECNUM+2
 	rol
 	sta SD_ADDR+3
-	bcs sdcard_set_addr_fail                 ; branch if sector number too large for SD card
+	bcs sdcard_helper_fail                   ; branch if sector number too large for SD card
 	lda CARD_SECNUM+3
 	beq sdcard_set_addr_done                 ; do not branch if sector number too large for SD card
 
 	; FALLTROUGH
 
-sdcard_set_addr_fail:
+sdcard_helper_fail:
 
 	sec
 	rts
+
+
+;
+; Wait till card is ready
+;
+; Input: none
+; Output: Carry set = error
+; Preserves: .Y, .Z
+
+sdcard_wait_ready:
+
+	lda SD_CTL
+	; Sometimes we see this result, i.e., sdcard.vhdl thinks it is done,
+	; but sdcardio.vhdl thinks not. This means a read error.
+	cmp #$01
+	beq sdcard_helper_fail
+	tax
+	and #$40
+	bne sdcard_helper_fail
+	txa
+	and #$03
+	bne sdcard_wait_ready
+
+	clc
+	rts

src/dos_m65/sdcard/sdcard_readsector.s

@@ -16,7 +16,7 @@ sdcard_readsector:
 	; Set read address
 
 	jsr sdcard_set_addr
-	bcs sdcard_readsector_fail 
+	bcs sdcard_readsector_fail
 
 	; FALLTROUGH
 
@@ -33,7 +33,7 @@ sdcard_readsector_try_loop:
 
 	; Wait till card is ready
 
-	jsr sdcard_readsector_wait
+	jsr sdcard_wait_ready
 	bcs sdcard_readsector_fail
 
 	; Read command
@@ -43,7 +43,7 @@ sdcard_readsector_try_loop:
 
 	; Wait for command completion
 
-	jsr sdcard_readsector_wait
+	jsr sdcard_wait_ready
 	bcs sdcard_readsector_fail
 
 
@@ -96,27 +96,3 @@ sdcard_readsector_copy_data:
 
 	clc
 	rts
-
-sdcard_readsector_wait:
-
-	; Wait till card is ready
-
-	lda SD_CTL
-	; Sometimes we see this result, i.e., sdcard.vhdl thinks it is done,
-	; but sdcardio.vhdl thinks not. This means a read error.
-	cmp #$01
-	beq sdcard_readsector_wait_fail
-	tax
-	and #$40
-	bne sdcard_readsector_wait_fail
-	txa
-	and #$03
-	bne sdcard_readsector_wait
-
-	clc
-	rts
-
-sdcard_readsector_wait_fail:
-
-	sec
-	rts

src/dos_m65/sdcard/sdcard_writesector.s

@@ -17,7 +17,7 @@ sdcard_writesector:
 	and #$03
 	bne sdcard_writesector             ; XXX add a timer here
 
-	; End reset
+	; End reset XXX should this be done for sector reading too?
 
 	lda #$01
 	sta SD_CTL
@@ -25,12 +25,20 @@ sdcard_writesector:
 	; Set write address
 
 	jsr sdcard_set_addr
+	bcs sdcard_writesector_fail
 
+	; FALLTROUGH
 
+sdcard_writesector_write:
 
+	; Set number of retries
 
+	lda #$0A
+	sta CARD_TMP_RETRIES
 
+	; FALLTROUGH
 
+sdcard_writesector_try_loop:
 
 	jsr sdcard_writesector_copy_data
 
@@ -43,6 +51,18 @@ sdcard_writesector:
 
 
 
+
+
+
+sdcard_writesector_fail:
+
+	sec
+	rts
+
+
+
+
+
 ;
 ; Helper routines
 ;