mirror of
https://github.com/bobbimanners/emailler.git
synced 2024-10-11 17:23:39 +00:00
448010f7b9
git-svn-id: http://svn.code.sf.net/p/netboot65/code@223 93682198-c243-4bdb-bd91-e943c89aac3b
343 lines
6.4 KiB
ArmAsm
343 lines
6.4 KiB
ArmAsm
; XMODEM file transfer
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.include "../inc/common.i"
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.ifndef KPR_API_VERSION_NUMBER
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.define EQU =
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.include "../inc/kipper_constants.i"
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.endif
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XMODEM_BLOCK_SIZE=$80 ;how many bytes (excluding header & checksum) in each block?
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XMODEM_TIMEOUT_SECONDS=5
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XMODEM_MAX_ERRORS=10
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SOH = $01
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EOT = $04
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ACK = $06
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NAK = $15
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CAN = $18
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.export xmodem_receive
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.import ip65_process
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.import ip65_error
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.import tcp_callback
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.import copymem
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.importzp copy_src
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.importzp copy_dest
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.import tcp_send
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.import tcp_send_data_len
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.import tcp_inbound_data_ptr
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.import tcp_inbound_data_length
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.import check_for_abort_key
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.import print_a
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.import print_cr
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.import print_ascii_as_native
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.import print_hex
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.segment "SELF_MODIFIED_CODE"
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got_byte:
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jmp $ffff
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next_char:
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lda buffer_length
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bne @not_eof
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lda buffer_length+1
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bne @not_eof
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sec
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rts
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@not_eof:
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next_char_ptr=*+1
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lda $ffff
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pha
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inc next_char_ptr
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bne :+
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inc next_char_ptr+1
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:
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sec
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lda buffer_length
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sbc #1
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sta buffer_length
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lda buffer_length+1
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sbc #0
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sta buffer_length+1
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pla
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clc
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rts
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.bss
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original_tcp_callback: .res 2
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getc_timeout_end: .res 1
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getc_timeout_seconds: .res 1
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buffer_length: .res 2
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.code
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xmodem_receive:
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;recieve a file via XMODEM (checksum mode only, not CRC)
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;assumes that a tcp connection has already been set up, and that the other end is waiting to start sending
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;inputs: AX points to routine to call once for each byte in downloaded file (e.g. save to disk, print to screen, whatever) - byte will be in A
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;outputs: none
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stax got_byte+1
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lda #0
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sta buffer_length
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sta buffer_length+1
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sta error_number
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sta user_abort
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lda #1
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sta expected_block_number
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ldax tcp_callback
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stax original_tcp_callback
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ldax #xmodem_receive_callback
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stax tcp_callback
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jsr send_nak
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@next_block:
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lda #0
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sta block_ptr
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sta checksum
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ldax #expecting
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jsr print_ascii_as_native
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ldax #block_number_msg
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jsr print_ascii_as_native
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lda expected_block_number
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jsr print_hex
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jsr print_cr
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@wait_for_block_start:
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lda #XMODEM_TIMEOUT_SECONDS
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jsr getc
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bcc @got_block_start
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lda user_abort
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beq @no_user_abort
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jmp @exit
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@no_user_abort:
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jsr send_nak
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inc error_number
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ldax #timeout_msg
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jsr print_ascii_as_native
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lda error_number
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jsr print_hex
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jsr print_cr
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lda error_number
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cmp #XMODEM_MAX_ERRORS
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bcc @wait_for_block_start
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lda #KPR_ERROR_TOO_MANY_ERRORS
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sta ip65_error
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jmp @exit
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@got_block_start:
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cmp #EOT
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bne :+
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jsr send_ack
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clc
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jmp @exit
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:
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cmp #SOH
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bne @wait_for_block_start
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;now get block number
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lda #XMODEM_TIMEOUT_SECONDS
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jsr getc
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bcc :+
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jsr send_nak
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jmp @wait_for_block_start
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:
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sta actual_block_number
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;now get block number check
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lda #XMODEM_TIMEOUT_SECONDS
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jsr getc
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bcc :+
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jsr send_nak
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jmp @wait_for_block_start
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:
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adc actual_block_number
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cmp #$ff
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bne @wait_for_block_start
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ldax #receiving
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jsr print_ascii_as_native
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ldax #block_number_msg
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jsr print_ascii_as_native
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lda actual_block_number
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jsr print_hex
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jsr print_cr
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@next_byte:
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lda #XMODEM_TIMEOUT_SECONDS
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jsr getc
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bcs @exit
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ldx block_ptr
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sta xmodem_block_buffer,x
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adc checksum
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sta checksum
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inc block_ptr
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lda block_ptr
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bpl @next_byte
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ldax #checksum_msg
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jsr print_ascii_as_native
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lda checksum
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jsr print_hex
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lda #'/'
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jsr print_a
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lda #XMODEM_TIMEOUT_SECONDS
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jsr getc
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bcs @exit
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sta received_checksum
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jsr print_hex
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jsr print_cr
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lda received_checksum
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cmp checksum
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beq @checksum_ok
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jsr send_nak
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jmp @next_block
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@checksum_ok:
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lda expected_block_number
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cmp actual_block_number
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bne @skip_block_output
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lda #0
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sta block_ptr
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@output_byte:
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ldx block_ptr
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lda xmodem_block_buffer,x
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jsr got_byte
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inc block_ptr
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lda block_ptr
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bpl @output_byte
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inc expected_block_number
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@skip_block_output:
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jsr send_ack
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jmp @next_block
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clc
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@exit:
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ldax original_tcp_callback
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stax tcp_callback
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rts
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xmodem_receive_callback:
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lda tcp_inbound_data_length+1
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cmp #$ff
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bne @not_eof
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rts
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@not_eof:
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ldax tcp_inbound_data_ptr
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stax copy_src
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ldax #xmodem_stream_buffer
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stax copy_dest
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stax next_char_ptr
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ldax tcp_inbound_data_length
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stax buffer_length
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jmp copymem
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send_nak:
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ldax #1
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stax tcp_send_data_len
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ldax #nak_packet
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jmp tcp_send
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send_ack:
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ldax #1
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stax tcp_send_data_len
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ldax #ack_packet
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jmp tcp_send
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getc:
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sta getc_timeout_seconds
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clc
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lda $dc09 ;time of day clock: seconds (in BCD)
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sed
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adc getc_timeout_seconds
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cmp #$60
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bcc @timeout_set
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sec
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sbc #$60
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@timeout_set:
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cld
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sta getc_timeout_end
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@poll_loop:
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; inc $d021
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jsr next_char
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bcs @no_char
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rts ;done!
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@no_char:
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jsr check_for_abort_key
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bcc @no_abort
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lda #KPR_ERROR_ABORTED_BY_USER
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sta ip65_error
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inc user_abort
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rts
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@no_abort:
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jsr ip65_process
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lda $dc09 ;time of day clock: seconds
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cmp getc_timeout_end
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bne @poll_loop
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sec
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rts
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.rodata
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ack_packet: .byte ACK
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nak_packet: .byte NAK
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block_number_msg: .byte " block $",0
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expecting: .byte "expecting",0
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receiving: .byte "receiving",0
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bad_block_number: .byte "bad block number",0
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checksum_msg: .byte "checksum $",0
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timeout_msg: .byte "timeout $",0
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.segment "APP_SCRATCH"
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xmodem_stream_buffer: .res 1600
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xmodem_block_buffer: .res 128
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expected_block_number: .res 1
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actual_block_number: .res 1
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checksum: .res 1
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received_checksum: .res 1
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block_ptr: .res 1
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error_number: .res 1
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user_abort: .res 1
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;-- LICENSE FOR xmodem.s --
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; The contents of this file are subject to the Mozilla Public License
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; Version 1.1 (the "License"); you may not use this file except in
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; compliance with the License. You may obtain a copy of the License at
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; http://www.mozilla.org/MPL/
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;
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; Software distributed under the License is distributed on an "AS IS"
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; basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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; License for the specific language governing rights and limitations
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; under the License.
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;
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; The Original Code is ip65.
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;
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; The Initial Developer of the Original Code is Jonno Downes,
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; jonno@jamtronix.com.
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; Portions created by the Initial Developer are Copyright (C) 2009
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; Jonno Downes. All Rights Reserved.
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; -- LICENSE END --
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