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