; ; Copyright (c) 2007, Adam Dunkels and Oliver Schmidt ; All rights reserved. ; ; Redistribution and use in source and binary forms, with or without ; modification, are permitted provided that the following conditions ; are met: ; 1. Redistributions of source code must retain the above copyright ; notice, this list of conditions and the following disclaimer. ; 2. Redistributions in binary form must reproduce the above copyright ; notice, this list of conditions and the following disclaimer in the ; documentation and/or other materials provided with the distribution. ; 3. Neither the name of the Institute nor the names of its contributors ; may be used to endorse or promote products derived from this software ; without specific prior written permission. ; ; THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND ; ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE ; IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ; ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE ; FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL ; DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS ; OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) ; HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT ; LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY ; OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF ; SUCH DAMAGE. ; ; This file is part of the Contiki operating system. ; ; Author: Adam Dunkels , Oliver Schmidt ; ; $Id: cs8900a.S,v 1.1 2007/11/19 23:14:14 oliverschmidt Exp $ ; ;--------------------------------------------------------------------- .segment "JUMPTABLE" ; Driver signature .byte $65, $74, $68 ; "eth" .byte $01 ; Ethernet driver API version number ; Ethernet address mac: .byte $00, $0E, $3A ; OUI of Cirrus Logic .byte $11, $11, $11 ; Buffer attributes bufaddr:.res 2 ; Address bufsize:.res 2 ; Size ; Jump table. .addr init .addr poll .addr send .addr exit ;--------------------------------------------------------------------- .zeropage sp: .res 2 ; Stack pointer (Do not trash !) reg: .res 2 ; Address of rxtxreg ptr: .res 2 ; Indirect addressing pointer len: .res 2 ; Frame length cnt: .res 2 ; Frame length counter ;--------------------------------------------------------------------- .segment "EXTZP": zeropage ; Empty segment to avoid linker warnings ;--------------------------------------------------------------------- .rodata fixup: .byte fixup02-fixup01, fixup03-fixup02, fixup04-fixup03 .byte fixup05-fixup04, fixup06-fixup05, fixup07-fixup06 .byte fixup08-fixup07, fixup09-fixup08, fixup10-fixup09 .byte fixup11-fixup10, fixup12-fixup11, fixup13-fixup12 .byte fixup14-fixup13, fixup15-fixup14, fixup16-fixup15 .byte fixup17-fixup16, fixup18-fixup17, fixup19-fixup18 .byte fixup20-fixup19, fixup21-fixup20, fixup22-fixup21 .byte fixup23-fixup22, fixup24-fixup23, fixup25-fixup24 .byte fixup26-fixup25, fixup27-fixup26, fixup28-fixup27 .byte fixup29-fixup28, fixup30-fixup29, fixup31-fixup30 .byte fixup32-fixup31, fixup33-fixup32, fixup34-fixup33 .byte fixup35-fixup34, fixup36-fixup35, fixup37-fixup36 .byte fixup38-fixup37, fixup39-fixup38, fixup40-fixup39 .byte fixup41-fixup40, fixup42-fixup41, fixup43-fixup42 .byte fixup44-fixup43, fixup45-fixup44, fixup46-fixup45 fixups = * - fixup ;--------------------------------------------------------------------- rxtxreg := $FF00 ; High byte patched at runtime txcmd := $FF04 ; High byte patched at runtime txlen := $FF06 ; High byte patched at runtime packetpp := $FF0A ; High byte patched at runtime ppdata := $FF0C ; High byte patched at runtime .data ;--------------------------------------------------------------------- init: ; Save address of rxtxreg sta reg stx reg+1 ; Start with first fixup location lda #<(fixup01+1) ldx #>(fixup01+1) sta ptr stx ptr+1 ldx #$FF ldy #$00 ; Fixup address at location : lda reg eor (ptr),y ; Use XOR to support C64 RRNet sta (ptr),y iny lda reg+1 sta (ptr),y dey ; Advance to next fixup location inx cpx #fixups bcs :+ lda ptr clc adc fixup,x sta ptr bcc :- inc ptr+1 bcs :- ; Always ; Turn on transmission and reception of frames ; PACKETPP = $0112, PPDATA = $00C0 : lda #$12 ldx #$01 fixup01:sta packetpp fixup02:stx packetpp+1 lda #$C0 ldx #$00 fixup03:sta ppdata fixup04:stx ppdata+1 ; Accept valid unicast + broadcast frames ; PACKETPP = $0104, PPDATA = $0D05 lda #$04 ldx #$01 fixup05:sta packetpp fixup06:stx packetpp+1 lda #$05 ldx #$0D fixup07:sta ppdata fixup08:stx ppdata+1 ; Set MAC address ; PACKETPP = $0158, PPDATA = MAC[0], MAC[1] lda #$58 ldx #$01 fixup09:sta packetpp fixup10:stx packetpp+1 lda mac ldx mac+1 fixup11:sta ppdata fixup12:stx ppdata+1 ; PACKETPP = $015A, PPDATA = MAC[2], MAC[3] lda #$5A ldx #$01 fixup13:sta packetpp fixup14:stx packetpp+1 lda mac+2 ldx mac+3 fixup15:sta ppdata fixup16:stx ppdata+1 ; PACKETPP = 0x015C, PPDATA = MAC[4], MAC[5] lda #$5C ldx #$01 fixup17:sta packetpp fixup18:stx packetpp+1 lda mac+4 ldx mac+5 fixup19:sta ppdata fixup20:stx ppdata+1 rts ;--------------------------------------------------------------------- poll: ; Check receiver event register to see if there ; are any valid unicast frames avaliable ; PACKETPP = $0124, PPDATA & $0D00 ? lda #$24 ldx #$01 fixup21:sta packetpp fixup22:stx packetpp+1 fixup23:lda ppdata+1 and #$0D bne :+ ; No frame ready tax rts ; Process the incoming frame ; -------------------------- ; Read receiver event and discard it ; RXTXREG : fixup24:ldx rxtxreg+1 fixup25:lda rxtxreg ; Read frame length ; cnt = len = RXTXREG fixup26:ldx rxtxreg+1 fixup27:lda rxtxreg sta len stx len+1 sta cnt stx cnt+1 ; Adjust odd frame length lsr bcc :+ inc cnt bne :+ inc cnt+1 ; Is cnt > bufsize ? : sec lda cnt sbc bufsize lda cnt+1 sbc bufsize+1 bcc :+ ; Yes, skip frame ; PACKETPP = $0102, PPDATA = PPDATA | $0040 lda #$02 ldx #$01 fixup28:sta packetpp fixup29:stx packetpp+1 fixup30:lda ppdata ora #$40 fixup31:sta ppdata ; No frame ready lda #$00 tax rts ; Read bytes into buffer : lda bufaddr ldx bufaddr+1 sta ptr stx ptr+1 ldy #$00 read: fixup32:lda rxtxreg sta (ptr),y iny fixup33:lda rxtxreg+1 sta (ptr),y iny bne :+ inc ptr+1 : cpy cnt bne read dec cnt+1 bpl read ; Return frame length lda len ldx len+1 rts ;--------------------------------------------------------------------- send: ; Save frame length sta cnt stx cnt+1 ; Transmit command lda #$C0 ldx #$00 fixup34:sta txcmd fixup35:stx txcmd+1 lda cnt ldx cnt+1 fixup36:sta txlen fixup37:stx txlen+1 ; Adjust odd frame length lsr bcc :+ inc cnt bne :+ inc cnt+1 ; 8 retries : ldy #$08 ; Check for avaliable buffer space ; PACKETPP = $0138, PPDATA & $0100 ? : lda #$38 ldx #$01 fixup38:sta packetpp fixup39:stx packetpp+1 fixup40:lda ppdata+1 and #$01 bne :+ ; No space avaliable, skip a received frame ; PACKETPP = $0102, PPDATA = PPDATA | $0040 lda #$02 ldx #$01 fixup41:sta packetpp fixup42:stx packetpp+1 fixup43:lda ppdata ora #$40 fixup44:sta ppdata ; And try again dey bne :- rts ; Send the frame ; -------------- ; Write bytes from buffer : lda bufaddr ldx bufaddr+1 sta ptr stx ptr+1 ldy #$00 write: lda (ptr),y fixup45:sta rxtxreg iny lda (ptr),y fixup46:sta rxtxreg+1 iny bne :+ inc ptr+1 : cpy cnt bne write dec cnt+1 bpl write rts ;--------------------------------------------------------------------- exit: rts ;---------------------------------------------------------------------