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208 lines
4.2 KiB
NASM
208 lines
4.2 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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;start of code
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;NO BASIC stub! needs to be direct booted via TFTP
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org $1000
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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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lda NB65_API_VERSION
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cmp #02
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bpl .version_ok
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print incorrect_version
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jmp reset_after_keypress
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.version_ok
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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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;print out the current configuration
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nb65call #NB65_PRINT_IP_CONFIG
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;prompt for a hostname, then resolve to an IP address
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.get_hostname
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print #remote_host
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nb65call #NB65_INPUT_HOSTNAME
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bcc .host_entered
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;if no host entered, then bail.
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jmp reset_after_keypress
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.host_entered
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stax nb65_param_buffer
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print_cr
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print #resolving
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ldax nb65_param_buffer
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nb65call #NB65_PRINT_ASCIIZ
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print_cr
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ldaxi #nb65_param_buffer
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nb65call #NB65_DNS_RESOLVE
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bcc .resolved_ok
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print #failed
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print_cr
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jsr print_errorcode
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jmp .get_hostname
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.resolved_ok
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.get_port
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print #remote_port
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nb65call #NB65_INPUT_PORT_NUMBER
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bcc .port_entered
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;if no port entered, then assume port 23
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ldaxi #23
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.port_entered
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stax nb65_param_buffer+NB65_TCP_PORT
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ldaxi #tcp_callback
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stax nb65_param_buffer+NB65_TCP_CALLBACK
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print #connecting
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ldaxi #nb65_param_buffer
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nb65call #NB65_TCP_CONNECT
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bcc .connect_ok
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print_cr
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print #failed
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jsr print_errorcode
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jmp .get_hostname
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.connect_ok
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print #ok
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.loop_forever
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jsr NB65_PERIODIC_PROCESSING_VECTOR
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jmp .loop_forever
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;tcp callback - will be executed whenever data arrives on the TCP connection
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tcp_callback
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.byte $92
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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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incorrect_version dc.b "ERROR - NB65 API MUST BE AT LEAST VERSION 2.",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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resolving dc.b "RESOLVING ",0
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connecting dc.b "CONNECTING ",0
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remote_host dc.b "REMOTE HOST - BLANK TO QUIT",13,": ",0
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remote_port dc.b "REMOTE PORT - BLANK FOR TELNET DEFAULT",13,": ",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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