emailler/client/examples/dasm_d64_upload.asm

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;NB65 API example in DASM format (http://www.atari2600.org/DASM/)
processor 6502
include "../inc/nb65_constants.i"
;useful macros
mac ldax
lda [{1}]
ldx [{1}]+1
endm
mac ldaxi
lda #<[{1}]
ldx #>[{1}]
endm
mac stax
sta [{1}]
stx [{1}]+1
endm
mac cout
lda [{1}]
jsr print_a
endm
mac print_cr
cout #13
jsr print_a
endm
mac nb65call
ldy [{1}]
jsr NB65_DISPATCH_VECTOR
endm
mac print
ldaxi [{1}]
ldy #NB65_PRINT_ASCIIZ
jsr NB65_DISPATCH_VECTOR
endm
;some routines & zero page variables
print_a equ $ffd2
temp_ptr equ $FB ; scratch space in page zero
;######### KERNEL functions
CHKIN EQU $ffc6
CHKOUT EQU $ffc9
CHRIN EQU $ffcf
CHROUT EQU $ffd2
CLALL EQU $FFE7
CLOSE EQU $ffc3
OPEN EQU $ffc0
READST EQU $ffb7
SETNAM EQU $ffbd
SETLFS EQU $ffba
;start of code
;BASIC stub
org $801
dc.b $0b,$08,$d4,$07,$9e,$32,$30,$36,$31,$00,$00,$00
ldaxi #NB65_CART_SIGNATURE ;where signature should be in cartridge (if cart is banked in)
jsr look_for_signature
bcc found_nb65_signature
ldaxi #NB65_RAM_STUB_SIGNATURE ;where signature should be in a RAM stub
jsr look_for_signature
bcs nb65_signature_not_found
jsr NB65_RAM_STUB_ACTIVATE ;we need to turn on NB65 cartridge
jmp found_nb65_signature
nb65_signature_not_found
ldaxi #nb65_api_not_found_message
jsr print_ax
rts
found_nb65_signature
print #initializing
nb65call #NB65_INITIALIZE
bcc .init_ok
print_cr
print #failed
print_cr
jsr print_errorcode
jmp reset_after_keypress
.init_ok
;if we got here, we have found the NB65 API and initialised the IP stack
jsr CLALL
.send_1_image
lda #$93 ;cls
jsr print_a
print #signon_message
jsr reset_counters_to_first_sector
print #enter_filename
ldaxi #filter_dns ;this is pretty close to being a filter for legal chars in file names as well
jsr get_filtered_input
bcs .no_filename_entered
stax nb65_param_buffer+NB65_TFTP_FILENAME
print #position_cursor_for_track_display
ldaxi #send_next_block
stax nb65_param_buffer+NB65_TFTP_POINTER
ldaxi #nb65_param_buffer
nb65call #NB65_TFTP_CALLBACK_UPLOAD
bcc .upload_ok
print_cr
print #failed
jmp print_nb65_errorcode
.upload_ok
lda #15 ; filenumber 15 - command channel
jsr CLOSE
print_cr
print #ok
print #press_a_key_to_continue
jsr get_key
jmp .send_1_image ;done! so go again
.no_filename_entered
rts
send_next_block
;tftp upload callback routine
;AX will point to address to fill
stax sector_buffer_address
lda track
cmp #36
beq .past_last_track
print #position_cursor_for_track_display
jsr print_current_sector
jsr read_sector
lda #$30
cmp error_buffer
bne .was_an_error
.after_error_check
jsr move_to_next_sector
bcc .not_last_sector
ldaxi #$100
rts
.not_last_sector
inc sector_buffer_address+1
jsr read_sector
jsr move_to_next_sector
ldaxi #$200
rts
.past_last_track
ldaxi #$0000
rts
.was_an_error
print #position_cursor_for_error_display
print #drive_error
print_cr
jsr print_current_sector
print #error_buffer
jmp .after_error_check
print_current_sector
print #track_no
lda track
jsr byte_to_ascii
pha
txa
jsr print_a
pla
jsr print_a
print #sector_no
lda sector
jsr byte_to_ascii
pha
txa
jsr print_a
pla
jsr print_a
print_cr
rts
read_sector
;routine to read a sector cribbed from http://codebase64.org/doku.php?id=base:reading_a_sector_from_disk
; - requires track and sector values be set first
; sector will be written to address whos value is stored in sector_data
; open the channel file
jsr make_read_sector_command
lda #1
ldx #<cname
ldy #>cname
jsr SETNAM
lda #$02
ldx #$08
ldy #$02
jsr SETLFS
jsr OPEN
bcs .error
ldx #<command_buffer
ldy #>command_buffer
lda #12
jsr SETNAM
lda #15
ldx $BA ;use whatever was last device #
ldy #15
jsr SETLFS
jsr OPEN
bcs .error
jsr check_error_channel
lda #$30
cmp error_buffer
beq .was_not_an_error
print #error_buffer
.was_not_an_error
ldx #$02 ; filenumber 2
jsr CHKIN ;(file 2 now used as input)
lda sector_buffer_address
sta temp_ptr
lda sector_buffer_address+1
sta temp_ptr+1
ldy #$00
.loop
jsr CHRIN ;(get a byte from file)
sta (temp_ptr),Y ; write byte to memory
iny
bne .loop ; next byte, end when 256 bytes are read
.close
lda #15 ; filenumber 15
jsr CLOSE
lda #$02 ; filenumber 2
jsr CLOSE
ldx #$00 ; filenumber 0 = keyboard
jsr CHKIN ;(keyboard now input device again)
rts
.error
pha
print #error_opening_channel
pla
nb65call #NB65_PRINT_HEX
jmp .close
check_error_channel
ldx #$0F ; filenumber 15
jsr CHKIN ;(file 15 now used as input)
ldy #$00
.ecloop
jsr READST ;(read status byte)
bne .eof ; either EOF or read error
jsr CHRIN ;(get a byte from file)
sta error_buffer,y
iny
jmp .ecloop ; next byte
.eof
lda #0
sta error_buffer,y
ldx #$00 ; filenumber 0 = keyboard
jsr CHKIN ;(keyboard now input device again)
rts
make_read_sector_command
;fill command buffer with command to read in track & sector
;returns length of command in Y
ldy #0
lda #85 ;"U"
sta command_buffer,y
iny
lda #$31 ;"1"
sta command_buffer,y
iny
lda #$20 ;" "
sta command_buffer,y
iny
lda #$32 ;"2" - file number
sta command_buffer,y
iny
lda #$20 ;" "
sta command_buffer,y
iny
lda #$30 ;"0" - drive number
sta command_buffer,y
iny
lda #$20 ;" "
sta command_buffer,y
iny
lda track
jsr byte_to_ascii
pha
txa
sta command_buffer,y
pla
iny
sta command_buffer,y
iny
lda #$20 ;" "
sta command_buffer,y
iny
lda sector
jsr byte_to_ascii
pha
txa
sta command_buffer,y
pla
iny
sta command_buffer,y
iny
lda #0
sta command_buffer,y ;make it ASCIIZ so we can print it
rts
byte_to_ascii
cmp #30
bmi .not_30
ldx #$33
clc
adc #18
rts
.not_30
cmp #20
bmi .not_20
ldx #$32
clc
adc #28
rts
.not_20
cmp #10
bmi .not_10
ldx #$31
clc
adc #38
rts
.not_10
ldx #$30
clc
adc #48
rts
move_to_next_sector
inc sector
lda sector
cmp sectors_in_track
beq .move_to_next_track
rts
.move_to_next_track:
lda #0
sta sector
inc track
lda track
cmp #18
bne .not_track_18
lda #19
sta sectors_in_track
clc
rts
.not_track_18
cmp #25
bne .not_track_25
lda #18
sta sectors_in_track
clc
rts
.not_track_25
cmp #31
bne .not_track_31
lda #17
sta sectors_in_track
clc
rts
.not_track_31
lda track
cmp #36 ;carry will be set if hit track 36
rts
reset_counters_to_first_sector
ldx #1
stx track
dex
stx sector
ldx #21
stx sectors_in_track
rts
;look for NB65 signature at location pointed at by AX
look_for_signature subroutine
stax temp_ptr
ldy #3
.check_one_byte
lda (temp_ptr),y
cmp nb65_signature,y
bne .bad_match
dey
bpl .check_one_byte
clc
rts
.bad_match
sec
rts
print_ax subroutine
stax temp_ptr
ldy #0
.next_char
lda (temp_ptr),y
beq .done
jsr print_a
iny
jmp .next_char
.done
rts
get_key
jsr $ffe4
cmp #0
beq get_key
rts
reset_after_keypress
print #press_a_key_to_continue
jsr get_key
jmp $fce2 ;do a cold start
print_errorcode
print #error_code
nb65call #NB65_GET_LAST_ERROR
nb65call #NB65_PRINT_HEX
print_cr
rts
;constants
nb65_api_not_found_message dc.b "ERROR - NB65 API NOT FOUND.",13,0
nb65_signature dc.b $4E,$42,$36,$35 ; "NB65" - API signature
initializing dc.b "INITIALIZING ",13,0
error_code dc.b "ERROR CODE: $",0
press_a_key_to_continue dc.b "PRESS A KEY TO CONTINUE",13,0
failed dc.b "FAILED ", 0
ok dc.b "OK ", 0
;variables
nb65_param_buffer DS.B $20
current_byte DS.B 1
track DS.B 1
sector DS.B 1
sectors_in_track DS.B 1
error_buffer DS.B 128
command_buffer DS.B 128
sector_buffer DS.B 256
sector_buffer_address DS.B 2