mirror of
https://github.com/bobbimanners/emailler.git
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282 lines
4.5 KiB
ArmAsm
282 lines
4.5 KiB
ArmAsm
; Ethernet driver for CS8900A chip (as used in RR-NET and Uthernet adapters)
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;
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; Based on Doc Bacardi's tftp source
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.include "../inc/common.i"
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.include "cs8900a.i"
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.export eth_init
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.export eth_rx
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.export eth_tx
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.export eth_inp
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.export eth_inp_len
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.export eth_outp
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.export eth_outp_len
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.exportzp eth_dest
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.exportzp eth_src
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.exportzp eth_type
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.exportzp eth_data
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.import cs_init
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.import cs_packet_page
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.import cs_packet_data
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.import cs_rxtx_data
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.import cs_tx_cmd
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.import cs_tx_len
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.import cfg_mac
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.macro write_page page, value
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lda #page/2
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ldx #<value
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ldy #>value
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jsr cs_write_page
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.endmacro
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.segment "IP65ZP" : zeropage
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eth_packet: .res 2
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.bss
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; input and output buffers
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eth_inp_len: .res 2 ; input packet length
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eth_inp: .res 1518 ; space for input packet
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eth_outp_len: .res 2 ; output packet length
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eth_outp: .res 1518 ; space for output packet
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; ethernet packet offsets
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eth_dest = 0 ; offset of destination mac address in an ethernet packet
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eth_src = 6 ; offset of source address in an ethernet packet
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eth_type = 12 ; offset of packet type in an ethernet packet
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eth_data = 14 ; offset of packet data in an ethernet packet
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.code
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;initialize the ethernet adaptor
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;inputs: none
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;outputs: carry flag is set if there was an error, clear otherwise
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eth_init:
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jsr cs_init
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lda #0 ; check magic signature
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jsr cs_read_page
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cpx #$0e
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bne @notfound
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cpy #$63
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bne @notfound
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lda #1
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jsr cs_read_page
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cpx #0
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bne @notfound
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; y contains chip rev
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write_page pp_self_ctl, $0055 ; $0114, reset chip
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write_page pp_rx_ctl, $0d05 ; $0104, accept individual and broadcast packets
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lda #pp_ia/2 ; $0158, write mac address
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ldx cfg_mac
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ldy cfg_mac + 1
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jsr cs_write_page
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lda #pp_ia/2 + 1
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ldx cfg_mac + 2
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ldy cfg_mac + 3
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jsr cs_write_page
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lda #pp_ia/2 + 2
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ldx cfg_mac + 4
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ldy cfg_mac + 5
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jsr cs_write_page
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write_page pp_line_ctl, $00d3 ; $0112, enable rx and tx
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clc
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rts
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@notfound:
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sec
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rts
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;receive a packet
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;inputs: none
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;outputs:
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; if there was an error receiving the packet (or no packet was ready) then carry flag is set
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; if packet was received correctly then carry flag is clear,
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; eth_inp contains the received packet,
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; and eth_inp_len contains the length of the packet
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eth_rx:
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lda #$24 ; check rx status
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sta cs_packet_page
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lda #$01
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sta cs_packet_page + 1
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lda cs_packet_data + 1
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and #$0d
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bne :+
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sec ; no packet ready
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rts
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: lda cs_rxtx_data + 1 ; ignore status
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lda cs_rxtx_data
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lda cs_rxtx_data + 1 ; read packet length
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sta eth_inp_len + 1
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tax ; save
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lda cs_rxtx_data
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sta eth_inp_len
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lda #<eth_inp ; set packet pointer
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sta eth_packet
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lda #>eth_inp
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sta eth_packet + 1
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ldy #0
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cpx #0 ; < 256 bytes left?
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beq @tail
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@get256:
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lda cs_rxtx_data
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sta (eth_packet),y
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iny
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lda cs_rxtx_data + 1
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sta (eth_packet),y
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iny
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bne @get256
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inc eth_packet + 1
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dex
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bne @get256
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@tail:
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lda eth_inp_len ; bytes left / 2, round up
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lsr
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adc #0
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beq @done
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tax
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@get:
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lda cs_rxtx_data
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sta (eth_packet),y
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iny
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lda cs_rxtx_data + 1
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sta (eth_packet),y
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iny
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dex
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bne @get
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@done:
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clc
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rts
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; send a packet
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;inputs:
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; eth_outp: packet to send
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; eth_outp_len: length of packet to send
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;outputs:
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; if there was an error sending the packet then carry flag is set
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; otherwise carry flag is cleared
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eth_tx:
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lda #$c9 ; ask for buffer space
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sta cs_tx_cmd
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lda #0
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sta cs_tx_cmd + 1
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lda eth_outp_len ; set length
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sta cs_tx_len
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lda eth_outp_len + 1
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sta cs_tx_len + 1
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and #$f8
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beq :+
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inc $d020
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sec ; oversized packet
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rts
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: lda #<pp_bus_status ; select bus status register
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sta cs_packet_page
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lda #>pp_bus_status
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sta cs_packet_page + 1
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@waitspace:
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lda cs_packet_data + 1 ; wait for space
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ldx cs_packet_data
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lsr
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bcs @gotspace
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jsr @done ; polling too fast doesn't work, delay added by David Schmidt
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jmp @waitspace
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@gotspace:
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ldax #eth_outp ; send packet
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stax eth_packet
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ldy #0
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ldx eth_outp_len + 1
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beq @tail
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@send256:
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lda (eth_packet),y
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sta cs_rxtx_data
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iny
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lda (eth_packet),y
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sta cs_rxtx_data + 1
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iny
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bne @send256
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inc eth_packet + 1
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dex
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bne @send256
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@tail:
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ldx eth_outp_len
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beq @done
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@send:
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lda (eth_packet),y
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sta cs_rxtx_data
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dex
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beq @done
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iny
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lda (eth_packet),y
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sta cs_rxtx_data + 1
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iny
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dex
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bne @send
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@done: ; also used by timeout code above
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clc
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rts
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; read X/Y from page A * 2
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cs_read_page:
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asl
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sta cs_packet_page
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lda #0
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rol
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sta cs_packet_page + 1
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ldx cs_packet_data
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ldy cs_packet_data + 1
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rts
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; write X/Y to page A * 2
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cs_write_page:
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asl
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sta cs_packet_page
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lda #0
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rol
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sta cs_packet_page + 1
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stx cs_packet_data
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sty cs_packet_data + 1
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rts
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