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osd-contiki/cpu/6502/net/cs8900a.S

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Generic Cirrus Logic CS8900A driver for cc65 targets. The driver is intended to be loaded dynamically as relocatable module. It modifies itself to accomodate different Ethernet IO address locations: - C64 TFE ($DE00) - C64 RRNet ($DE08) - Apple2 Uther ($C0x0)
2007-11-20 00:14:14 +01:00
;
; 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 <adam@sics.se>, Oliver Schmidt <ol.sc@web.de>
;
;---------------------------------------------------------------------
.segment "JUMPTABLE"
; Driver signature
.byte $65, $74, $68 ; "eth"
.byte $01 ; Ethernet driver API version number
Do not reject frames with a length exactly equal to the uIP bufer size.
2013-01-30 23:39:01 +01:00
Generic Cirrus Logic CS8900A driver for cc65 targets. The driver is intended to be loaded dynamically as relocatable module. It modifies itself to accomodate different Ethernet IO address locations: - C64 TFE ($DE00) - C64 RRNet ($DE08) - Apple2 Uther ($C0x0)
2007-11-20 00:14:14 +01:00
; Ethernet address
mac: .byte $00, $0E, $3A ; OUI of Cirrus Logic
.byte $11, $11, $11
; Buffer attributes
bufaddr:.res 2 ; Address
bufsize:.res 2 ; Size
; Jump table.
.addr init
.addr poll
.addr send
.addr exit
;---------------------------------------------------------------------
.zeropage
sp: .res 2 ; Stack pointer (Do not trash !)
reg: .res 2 ; Address of rxtxreg
ptr: .res 2 ; Indirect addressing pointer
len: .res 2 ; Frame length
cnt: .res 2 ; Frame length counter
;---------------------------------------------------------------------
.rodata
Do not reject frames with a length exactly equal to the uIP bufer size.
2013-01-30 23:39:01 +01:00
Generic Cirrus Logic CS8900A driver for cc65 targets. The driver is intended to be loaded dynamically as relocatable module. It modifies itself to accomodate different Ethernet IO address locations: - C64 TFE ($DE00) - C64 RRNet ($DE08) - Apple2 Uther ($C0x0)
2007-11-20 00:14:14 +01:00
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
Optimized CS8900A driver for speed and size. - Speed: The primary byte copy loops are reduzed to the bare minimum by adjusting the base pointer 'ptr' and loop register 'y' in such a way that the 'y' overflow matches the low byte of the loop size. - Size: Factored out all repeated code into subroutines. Introduced a loop for setting the MAC address. Additional minor changes: - Activate frame reception as last step of initialization after CS8900A configuration. - Properly set internal address bits used by the CS8900A.
2013-09-11 20:48:23 +02:00
.byte fixup26-fixup25
Generic Cirrus Logic CS8900A driver for cc65 targets. The driver is intended to be loaded dynamically as relocatable module. It modifies itself to accomodate different Ethernet IO address locations: - C64 TFE ($DE00) - C64 RRNet ($DE08) - Apple2 Uther ($C0x0)
2007-11-20 00:14:14 +01:00
fixups = * - fixup
;---------------------------------------------------------------------
rxtxreg := $FF00 ; High byte patched at runtime
txcmd := $FF04 ; High byte patched at runtime
txlen := $FF06 ; High byte patched at runtime
Take in account that the C64 Retro Replay clockport needs to be activated in order to work with the RR-Net Ethernet card.
2007-12-08 22:05:48 +01:00
isq := $FF08 ; High byte patched at runtime
Generic Cirrus Logic CS8900A driver for cc65 targets. The driver is intended to be loaded dynamically as relocatable module. It modifies itself to accomodate different Ethernet IO address locations: - C64 TFE ($DE00) - C64 RRNet ($DE08) - Apple2 Uther ($C0x0)
2007-11-20 00:14:14 +01:00
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 #$00
; Fixup address at location
: lda reg
Minor change in comment.
2007-11-24 13:57:09 +01:00
eor (ptr),y ; Use XOR to support C64 RR-Net
Generic Cirrus Logic CS8900A driver for cc65 targets. The driver is intended to be loaded dynamically as relocatable module. It modifies itself to accomodate different Ethernet IO address locations: - C64 TFE ($DE00) - C64 RRNet ($DE08) - Apple2 Uther ($C0x0)
2007-11-20 00:14:14 +01:00
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
Fixed typo.
2007-12-08 22:19:06 +01:00
; Activate C64 RR clockport in order to operate RR-Net
Take in account that the C64 Retro Replay clockport needs to be activated in order to work with the RR-Net Ethernet card.
2007-12-08 22:05:48 +01:00
; - RR config register overlays CS8900A ISQ register
; - No need to distinguish as ISQ access doesn't hurt
:
fixup01:lda isq+1
ora #$01 ; Set clockport bit
fixup02:sta isq+1
Generic Cirrus Logic CS8900A driver for cc65 targets. The driver is intended to be loaded dynamically as relocatable module. It modifies itself to accomodate different Ethernet IO address locations: - C64 TFE ($DE00) - C64 RRNet ($DE08) - Apple2 Uther ($C0x0)
2007-11-20 00:14:14 +01:00
; Accept valid unicast + broadcast frames
; PACKETPP = $0104, PPDATA = $0D05
lda #$04
Optimized CS8900A driver for speed and size. - Speed: The primary byte copy loops are reduzed to the bare minimum by adjusting the base pointer 'ptr' and loop register 'y' in such a way that the 'y' overflow matches the low byte of the loop size. - Size: Factored out all repeated code into subroutines. Introduced a loop for setting the MAC address. Additional minor changes: - Activate frame reception as last step of initialization after CS8900A configuration. - Properly set internal address bits used by the CS8900A.
2013-09-11 20:48:23 +02:00
jsr packetpp_01
Generic Cirrus Logic CS8900A driver for cc65 targets. The driver is intended to be loaded dynamically as relocatable module. It modifies itself to accomodate different Ethernet IO address locations: - C64 TFE ($DE00) - C64 RRNet ($DE08) - Apple2 Uther ($C0x0)
2007-11-20 00:14:14 +01:00
lda #$05
ldx #$0D
Optimized CS8900A driver for speed and size. - Speed: The primary byte copy loops are reduzed to the bare minimum by adjusting the base pointer 'ptr' and loop register 'y' in such a way that the 'y' overflow matches the low byte of the loop size. - Size: Factored out all repeated code into subroutines. Introduced a loop for setting the MAC address. Additional minor changes: - Activate frame reception as last step of initialization after CS8900A configuration. - Properly set internal address bits used by the CS8900A.
2013-09-11 20:48:23 +02:00
fixup03:sta ppdata
fixup04:stx ppdata+1
Generic Cirrus Logic CS8900A driver for cc65 targets. The driver is intended to be loaded dynamically as relocatable module. It modifies itself to accomodate different Ethernet IO address locations: - C64 TFE ($DE00) - C64 RRNet ($DE08) - Apple2 Uther ($C0x0)
2007-11-20 00:14:14 +01:00
; Set MAC address
; PACKETPP = $0158, PPDATA = MAC[0], MAC[1]
; PACKETPP = $015A, PPDATA = MAC[2], MAC[3]
Optimized CS8900A driver for speed and size. - Speed: The primary byte copy loops are reduzed to the bare minimum by adjusting the base pointer 'ptr' and loop register 'y' in such a way that the 'y' overflow matches the low byte of the loop size. - Size: Factored out all repeated code into subroutines. Introduced a loop for setting the MAC address. Additional minor changes: - Activate frame reception as last step of initialization after CS8900A configuration. - Properly set internal address bits used by the CS8900A.
2013-09-11 20:48:23 +02:00
; PACKETPP = $015C, PPDATA = MAC[4], MAC[5]
ldy #$58
: tya
jsr packetpp_01
lda mac-$58,y
ldx mac-$58+1,y
fixup05:sta ppdata
fixup06:stx ppdata+1
iny
iny
cpy #$58+6
bcc :-
; Turn on transmission and reception of frames
; PACKETPP = $0112, PPDATA = $00D3
lda #$12
jsr packetpp_01
lda #$D3
ldx #$00
fixup07:sta ppdata
fixup08:stx ppdata+1
Generic Cirrus Logic CS8900A driver for cc65 targets. The driver is intended to be loaded dynamically as relocatable module. It modifies itself to accomodate different Ethernet IO address locations: - C64 TFE ($DE00) - C64 RRNet ($DE08) - Apple2 Uther ($C0x0)
2007-11-20 00:14:14 +01:00
rts
;---------------------------------------------------------------------
poll:
; Check receiver event register to see if there
; are any valid unicast frames avaliable
; PACKETPP = $0124, PPDATA & $0D00 ?
lda #$24
Optimized CS8900A driver for speed and size. - Speed: The primary byte copy loops are reduzed to the bare minimum by adjusting the base pointer 'ptr' and loop register 'y' in such a way that the 'y' overflow matches the low byte of the loop size. - Size: Factored out all repeated code into subroutines. Introduced a loop for setting the MAC address. Additional minor changes: - Activate frame reception as last step of initialization after CS8900A configuration. - Properly set internal address bits used by the CS8900A.
2013-09-11 20:48:23 +02:00
jsr packetpp_01
fixup09:lda ppdata+1
Generic Cirrus Logic CS8900A driver for cc65 targets. The driver is intended to be loaded dynamically as relocatable module. It modifies itself to accomodate different Ethernet IO address locations: - C64 TFE ($DE00) - C64 RRNet ($DE08) - Apple2 Uther ($C0x0)
2007-11-20 00:14:14 +01:00
and #$0D
bne :+
; No frame ready
tax
rts
; Process the incoming frame
; --------------------------
; Read receiver event and discard it
; RXTXREG
:
Optimized CS8900A driver for speed and size. - Speed: The primary byte copy loops are reduzed to the bare minimum by adjusting the base pointer 'ptr' and loop register 'y' in such a way that the 'y' overflow matches the low byte of the loop size. - Size: Factored out all repeated code into subroutines. Introduced a loop for setting the MAC address. Additional minor changes: - Activate frame reception as last step of initialization after CS8900A configuration. - Properly set internal address bits used by the CS8900A.
2013-09-11 20:48:23 +02:00
fixup10:ldx rxtxreg+1
fixup11:lda rxtxreg
Generic Cirrus Logic CS8900A driver for cc65 targets. The driver is intended to be loaded dynamically as relocatable module. It modifies itself to accomodate different Ethernet IO address locations: - C64 TFE ($DE00) - C64 RRNet ($DE08) - Apple2 Uther ($C0x0)
2007-11-20 00:14:14 +01:00
; Read frame length
; cnt = len = RXTXREG
Optimized CS8900A driver for speed and size. - Speed: The primary byte copy loops are reduzed to the bare minimum by adjusting the base pointer 'ptr' and loop register 'y' in such a way that the 'y' overflow matches the low byte of the loop size. - Size: Factored out all repeated code into subroutines. Introduced a loop for setting the MAC address. Additional minor changes: - Activate frame reception as last step of initialization after CS8900A configuration. - Properly set internal address bits used by the CS8900A.
2013-09-11 20:48:23 +02:00
fixup12:ldx rxtxreg+1
fixup13:lda rxtxreg
Generic Cirrus Logic CS8900A driver for cc65 targets. The driver is intended to be loaded dynamically as relocatable module. It modifies itself to accomodate different Ethernet IO address locations: - C64 TFE ($DE00) - C64 RRNet ($DE08) - Apple2 Uther ($C0x0)
2007-11-20 00:14:14 +01:00
sta len
stx len+1
sta cnt
stx cnt+1
; Adjust odd frame length
Optimized CS8900A driver for speed and size. - Speed: The primary byte copy loops are reduzed to the bare minimum by adjusting the base pointer 'ptr' and loop register 'y' in such a way that the 'y' overflow matches the low byte of the loop size. - Size: Factored out all repeated code into subroutines. Introduced a loop for setting the MAC address. Additional minor changes: - Activate frame reception as last step of initialization after CS8900A configuration. - Properly set internal address bits used by the CS8900A.
2013-09-11 20:48:23 +02:00
jsr adjustcnt
Generic Cirrus Logic CS8900A driver for cc65 targets. The driver is intended to be loaded dynamically as relocatable module. It modifies itself to accomodate different Ethernet IO address locations: - C64 TFE ($DE00) - C64 RRNet ($DE08) - Apple2 Uther ($C0x0)
2007-11-20 00:14:14 +01:00
Do not reject frames with a length exactly equal to the uIP bufer size.
2013-01-30 23:39:01 +01:00
; Is bufsize < cnt ?
Optimized CS8900A driver for speed and size. - Speed: The primary byte copy loops are reduzed to the bare minimum by adjusting the base pointer 'ptr' and loop register 'y' in such a way that the 'y' overflow matches the low byte of the loop size. - Size: Factored out all repeated code into subroutines. Introduced a loop for setting the MAC address. Additional minor changes: - Activate frame reception as last step of initialization after CS8900A configuration. - Properly set internal address bits used by the CS8900A.
2013-09-11 20:48:23 +02:00
sec
Do not reject frames with a length exactly equal to the uIP bufer size.
2013-01-30 23:39:01 +01:00
lda bufsize
sbc cnt
lda bufsize+1
sbc cnt+1
bcs :+
Generic Cirrus Logic CS8900A driver for cc65 targets. The driver is intended to be loaded dynamically as relocatable module. It modifies itself to accomodate different Ethernet IO address locations: - C64 TFE ($DE00) - C64 RRNet ($DE08) - Apple2 Uther ($C0x0)
2007-11-20 00:14:14 +01:00
; Yes, skip frame
Optimized CS8900A driver for speed and size. - Speed: The primary byte copy loops are reduzed to the bare minimum by adjusting the base pointer 'ptr' and loop register 'y' in such a way that the 'y' overflow matches the low byte of the loop size. - Size: Factored out all repeated code into subroutines. Introduced a loop for setting the MAC address. Additional minor changes: - Activate frame reception as last step of initialization after CS8900A configuration. - Properly set internal address bits used by the CS8900A.
2013-09-11 20:48:23 +02:00
jsr skipframe
Do not reject frames with a length exactly equal to the uIP bufer size.
2013-01-30 23:39:01 +01:00
Generic Cirrus Logic CS8900A driver for cc65 targets. The driver is intended to be loaded dynamically as relocatable module. It modifies itself to accomodate different Ethernet IO address locations: - C64 TFE ($DE00) - C64 RRNet ($DE08) - Apple2 Uther ($C0x0)
2007-11-20 00:14:14 +01:00
; No frame ready
lda #$00
tax
rts
; Read bytes into buffer
Optimized CS8900A driver for speed and size. - Speed: The primary byte copy loops are reduzed to the bare minimum by adjusting the base pointer 'ptr' and loop register 'y' in such a way that the 'y' overflow matches the low byte of the loop size. - Size: Factored out all repeated code into subroutines. Introduced a loop for setting the MAC address. Additional minor changes: - Activate frame reception as last step of initialization after CS8900A configuration. - Properly set internal address bits used by the CS8900A.
2013-09-11 20:48:23 +02:00
: jsr adjustptr
:
fixup14:lda rxtxreg
Generic Cirrus Logic CS8900A driver for cc65 targets. The driver is intended to be loaded dynamically as relocatable module. It modifies itself to accomodate different Ethernet IO address locations: - C64 TFE ($DE00) - C64 RRNet ($DE08) - Apple2 Uther ($C0x0)
2007-11-20 00:14:14 +01:00
sta (ptr),y
iny
Optimized CS8900A driver for speed and size. - Speed: The primary byte copy loops are reduzed to the bare minimum by adjusting the base pointer 'ptr' and loop register 'y' in such a way that the 'y' overflow matches the low byte of the loop size. - Size: Factored out all repeated code into subroutines. Introduced a loop for setting the MAC address. Additional minor changes: - Activate frame reception as last step of initialization after CS8900A configuration. - Properly set internal address bits used by the CS8900A.
2013-09-11 20:48:23 +02:00
fixup15:lda rxtxreg+1
Generic Cirrus Logic CS8900A driver for cc65 targets. The driver is intended to be loaded dynamically as relocatable module. It modifies itself to accomodate different Ethernet IO address locations: - C64 TFE ($DE00) - C64 RRNet ($DE08) - Apple2 Uther ($C0x0)
2007-11-20 00:14:14 +01:00
sta (ptr),y
iny
Optimized CS8900A driver for speed and size. - Speed: The primary byte copy loops are reduzed to the bare minimum by adjusting the base pointer 'ptr' and loop register 'y' in such a way that the 'y' overflow matches the low byte of the loop size. - Size: Factored out all repeated code into subroutines. Introduced a loop for setting the MAC address. Additional minor changes: - Activate frame reception as last step of initialization after CS8900A configuration. - Properly set internal address bits used by the CS8900A.
2013-09-11 20:48:23 +02:00
bne :-
Generic Cirrus Logic CS8900A driver for cc65 targets. The driver is intended to be loaded dynamically as relocatable module. It modifies itself to accomodate different Ethernet IO address locations: - C64 TFE ($DE00) - C64 RRNet ($DE08) - Apple2 Uther ($C0x0)
2007-11-20 00:14:14 +01:00
inc ptr+1
Minor optimization.
2007-11-29 22:56:55 +01:00
dex
Optimized CS8900A driver for speed and size. - Speed: The primary byte copy loops are reduzed to the bare minimum by adjusting the base pointer 'ptr' and loop register 'y' in such a way that the 'y' overflow matches the low byte of the loop size. - Size: Factored out all repeated code into subroutines. Introduced a loop for setting the MAC address. Additional minor changes: - Activate frame reception as last step of initialization after CS8900A configuration. - Properly set internal address bits used by the CS8900A.
2013-09-11 20:48:23 +02:00
bpl :-
Take in account that the C64 Retro Replay clockport needs to be activated in order to work with the RR-Net Ethernet card.
2007-12-08 22:05:48 +01:00
Generic Cirrus Logic CS8900A driver for cc65 targets. The driver is intended to be loaded dynamically as relocatable module. It modifies itself to accomodate different Ethernet IO address locations: - C64 TFE ($DE00) - C64 RRNet ($DE08) - Apple2 Uther ($C0x0)
2007-11-20 00:14:14 +01:00
; Return frame length
lda len
ldx len+1
rts
;---------------------------------------------------------------------
send:
; Save frame length
sta cnt
stx cnt+1
Do not reject frames with a length exactly equal to the uIP bufer size.
2013-01-30 23:39:01 +01:00
Generic Cirrus Logic CS8900A driver for cc65 targets. The driver is intended to be loaded dynamically as relocatable module. It modifies itself to accomodate different Ethernet IO address locations: - C64 TFE ($DE00) - C64 RRNet ($DE08) - Apple2 Uther ($C0x0)
2007-11-20 00:14:14 +01:00
; Transmit command
Optimized CS8900A driver for speed and size. - Speed: The primary byte copy loops are reduzed to the bare minimum by adjusting the base pointer 'ptr' and loop register 'y' in such a way that the 'y' overflow matches the low byte of the loop size. - Size: Factored out all repeated code into subroutines. Introduced a loop for setting the MAC address. Additional minor changes: - Activate frame reception as last step of initialization after CS8900A configuration. - Properly set internal address bits used by the CS8900A.
2013-09-11 20:48:23 +02:00
lda #$C9
Generic Cirrus Logic CS8900A driver for cc65 targets. The driver is intended to be loaded dynamically as relocatable module. It modifies itself to accomodate different Ethernet IO address locations: - C64 TFE ($DE00) - C64 RRNet ($DE08) - Apple2 Uther ($C0x0)
2007-11-20 00:14:14 +01:00
ldx #$00
Optimized CS8900A driver for speed and size. - Speed: The primary byte copy loops are reduzed to the bare minimum by adjusting the base pointer 'ptr' and loop register 'y' in such a way that the 'y' overflow matches the low byte of the loop size. - Size: Factored out all repeated code into subroutines. Introduced a loop for setting the MAC address. Additional minor changes: - Activate frame reception as last step of initialization after CS8900A configuration. - Properly set internal address bits used by the CS8900A.
2013-09-11 20:48:23 +02:00
fixup16:sta txcmd
fixup17:stx txcmd+1
Generic Cirrus Logic CS8900A driver for cc65 targets. The driver is intended to be loaded dynamically as relocatable module. It modifies itself to accomodate different Ethernet IO address locations: - C64 TFE ($DE00) - C64 RRNet ($DE08) - Apple2 Uther ($C0x0)
2007-11-20 00:14:14 +01:00
lda cnt
ldx cnt+1
Optimized CS8900A driver for speed and size. - Speed: The primary byte copy loops are reduzed to the bare minimum by adjusting the base pointer 'ptr' and loop register 'y' in such a way that the 'y' overflow matches the low byte of the loop size. - Size: Factored out all repeated code into subroutines. Introduced a loop for setting the MAC address. Additional minor changes: - Activate frame reception as last step of initialization after CS8900A configuration. - Properly set internal address bits used by the CS8900A.
2013-09-11 20:48:23 +02:00
fixup18:sta txlen
fixup19:stx txlen+1
Generic Cirrus Logic CS8900A driver for cc65 targets. The driver is intended to be loaded dynamically as relocatable module. It modifies itself to accomodate different Ethernet IO address locations: - C64 TFE ($DE00) - C64 RRNet ($DE08) - Apple2 Uther ($C0x0)
2007-11-20 00:14:14 +01:00
; Adjust odd frame length
Optimized CS8900A driver for speed and size. - Speed: The primary byte copy loops are reduzed to the bare minimum by adjusting the base pointer 'ptr' and loop register 'y' in such a way that the 'y' overflow matches the low byte of the loop size. - Size: Factored out all repeated code into subroutines. Introduced a loop for setting the MAC address. Additional minor changes: - Activate frame reception as last step of initialization after CS8900A configuration. - Properly set internal address bits used by the CS8900A.
2013-09-11 20:48:23 +02:00
jsr adjustcnt
Generic Cirrus Logic CS8900A driver for cc65 targets. The driver is intended to be loaded dynamically as relocatable module. It modifies itself to accomodate different Ethernet IO address locations: - C64 TFE ($DE00) - C64 RRNet ($DE08) - Apple2 Uther ($C0x0)
2007-11-20 00:14:14 +01:00
; 8 retries
Optimized CS8900A driver for speed and size. - Speed: The primary byte copy loops are reduzed to the bare minimum by adjusting the base pointer 'ptr' and loop register 'y' in such a way that the 'y' overflow matches the low byte of the loop size. - Size: Factored out all repeated code into subroutines. Introduced a loop for setting the MAC address. Additional minor changes: - Activate frame reception as last step of initialization after CS8900A configuration. - Properly set internal address bits used by the CS8900A.
2013-09-11 20:48:23 +02:00
ldy #$08
Do not reject frames with a length exactly equal to the uIP bufer size.
2013-01-30 23:39:01 +01:00
Generic Cirrus Logic CS8900A driver for cc65 targets. The driver is intended to be loaded dynamically as relocatable module. It modifies itself to accomodate different Ethernet IO address locations: - C64 TFE ($DE00) - C64 RRNet ($DE08) - Apple2 Uther ($C0x0)
2007-11-20 00:14:14 +01:00
; Check for avaliable buffer space
; PACKETPP = $0138, PPDATA & $0100 ?
: lda #$38
Optimized CS8900A driver for speed and size. - Speed: The primary byte copy loops are reduzed to the bare minimum by adjusting the base pointer 'ptr' and loop register 'y' in such a way that the 'y' overflow matches the low byte of the loop size. - Size: Factored out all repeated code into subroutines. Introduced a loop for setting the MAC address. Additional minor changes: - Activate frame reception as last step of initialization after CS8900A configuration. - Properly set internal address bits used by the CS8900A.
2013-09-11 20:48:23 +02:00
jsr packetpp_01
fixup20:lda ppdata+1
Generic Cirrus Logic CS8900A driver for cc65 targets. The driver is intended to be loaded dynamically as relocatable module. It modifies itself to accomodate different Ethernet IO address locations: - C64 TFE ($DE00) - C64 RRNet ($DE08) - Apple2 Uther ($C0x0)
2007-11-20 00:14:14 +01:00
and #$01
bne :+
; No space avaliable, skip a received frame
Optimized CS8900A driver for speed and size. - Speed: The primary byte copy loops are reduzed to the bare minimum by adjusting the base pointer 'ptr' and loop register 'y' in such a way that the 'y' overflow matches the low byte of the loop size. - Size: Factored out all repeated code into subroutines. Introduced a loop for setting the MAC address. Additional minor changes: - Activate frame reception as last step of initialization after CS8900A configuration. - Properly set internal address bits used by the CS8900A.
2013-09-11 20:48:23 +02:00
jsr skipframe
Generic Cirrus Logic CS8900A driver for cc65 targets. The driver is intended to be loaded dynamically as relocatable module. It modifies itself to accomodate different Ethernet IO address locations: - C64 TFE ($DE00) - C64 RRNet ($DE08) - Apple2 Uther ($C0x0)
2007-11-20 00:14:14 +01:00
; And try again
dey
bne :-
rts
; Send the frame
; --------------
; Write bytes from buffer
Optimized CS8900A driver for speed and size. - Speed: The primary byte copy loops are reduzed to the bare minimum by adjusting the base pointer 'ptr' and loop register 'y' in such a way that the 'y' overflow matches the low byte of the loop size. - Size: Factored out all repeated code into subroutines. Introduced a loop for setting the MAC address. Additional minor changes: - Activate frame reception as last step of initialization after CS8900A configuration. - Properly set internal address bits used by the CS8900A.
2013-09-11 20:48:23 +02:00
: jsr adjustptr
: lda (ptr),y
fixup21:sta rxtxreg
Generic Cirrus Logic CS8900A driver for cc65 targets. The driver is intended to be loaded dynamically as relocatable module. It modifies itself to accomodate different Ethernet IO address locations: - C64 TFE ($DE00) - C64 RRNet ($DE08) - Apple2 Uther ($C0x0)
2007-11-20 00:14:14 +01:00
iny
lda (ptr),y
Optimized CS8900A driver for speed and size. - Speed: The primary byte copy loops are reduzed to the bare minimum by adjusting the base pointer 'ptr' and loop register 'y' in such a way that the 'y' overflow matches the low byte of the loop size. - Size: Factored out all repeated code into subroutines. Introduced a loop for setting the MAC address. Additional minor changes: - Activate frame reception as last step of initialization after CS8900A configuration. - Properly set internal address bits used by the CS8900A.
2013-09-11 20:48:23 +02:00
fixup22:sta rxtxreg+1
Generic Cirrus Logic CS8900A driver for cc65 targets. The driver is intended to be loaded dynamically as relocatable module. It modifies itself to accomodate different Ethernet IO address locations: - C64 TFE ($DE00) - C64 RRNet ($DE08) - Apple2 Uther ($C0x0)
2007-11-20 00:14:14 +01:00
iny
Optimized CS8900A driver for speed and size. - Speed: The primary byte copy loops are reduzed to the bare minimum by adjusting the base pointer 'ptr' and loop register 'y' in such a way that the 'y' overflow matches the low byte of the loop size. - Size: Factored out all repeated code into subroutines. Introduced a loop for setting the MAC address. Additional minor changes: - Activate frame reception as last step of initialization after CS8900A configuration. - Properly set internal address bits used by the CS8900A.
2013-09-11 20:48:23 +02:00
bne :-
Generic Cirrus Logic CS8900A driver for cc65 targets. The driver is intended to be loaded dynamically as relocatable module. It modifies itself to accomodate different Ethernet IO address locations: - C64 TFE ($DE00) - C64 RRNet ($DE08) - Apple2 Uther ($C0x0)
2007-11-20 00:14:14 +01:00
inc ptr+1
Minor optimization.
2007-11-29 22:56:55 +01:00
dex
Optimized CS8900A driver for speed and size. - Speed: The primary byte copy loops are reduzed to the bare minimum by adjusting the base pointer 'ptr' and loop register 'y' in such a way that the 'y' overflow matches the low byte of the loop size. - Size: Factored out all repeated code into subroutines. Introduced a loop for setting the MAC address. Additional minor changes: - Activate frame reception as last step of initialization after CS8900A configuration. - Properly set internal address bits used by the CS8900A.
2013-09-11 20:48:23 +02:00
bpl :-
Generic Cirrus Logic CS8900A driver for cc65 targets. The driver is intended to be loaded dynamically as relocatable module. It modifies itself to accomodate different Ethernet IO address locations: - C64 TFE ($DE00) - C64 RRNet ($DE08) - Apple2 Uther ($C0x0)
2007-11-20 00:14:14 +01:00
rts
;---------------------------------------------------------------------
exit:
rts
Do not reject frames with a length exactly equal to the uIP bufer size.
2013-01-30 23:39:01 +01:00
Generic Cirrus Logic CS8900A driver for cc65 targets. The driver is intended to be loaded dynamically as relocatable module. It modifies itself to accomodate different Ethernet IO address locations: - C64 TFE ($DE00) - C64 RRNet ($DE08) - Apple2 Uther ($C0x0)
2007-11-20 00:14:14 +01:00
;---------------------------------------------------------------------
Optimized CS8900A driver for speed and size. - Speed: The primary byte copy loops are reduzed to the bare minimum by adjusting the base pointer 'ptr' and loop register 'y' in such a way that the 'y' overflow matches the low byte of the loop size. - Size: Factored out all repeated code into subroutines. Introduced a loop for setting the MAC address. Additional minor changes: - Activate frame reception as last step of initialization after CS8900A configuration. - Properly set internal address bits used by the CS8900A.
2013-09-11 20:48:23 +02:00
packetpp_01:
ldx #$01
fixup23:sta packetpp
fixup24:stx packetpp+1
rts
;---------------------------------------------------------------------
skipframe:
; PACKETPP = $0102, PPDATA = PPDATA | $0040
lda #$02
jsr packetpp_01
fixup25:lda ppdata
ora #$40
fixup26:sta ppdata
rts
;---------------------------------------------------------------------
adjustcnt:
lsr
bcc :+
inc cnt
bne :+
inc cnt+1
: rts
;---------------------------------------------------------------------
adjustptr:
lda cnt
eor #$FF ; Two's complement part 1
tay
iny ; Two's complement part 2
sty reg
sec
lda bufaddr
sbc reg
sta ptr
lda bufaddr+1
sbc #$00
sta ptr+1
ldx cnt+1
rts
;---------------------------------------------------------------------
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