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emailler/drivers/lan91c96.s

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Distilled IP65 out of NETBOOT65.
2013-12-13 21:24:03 +00:00
;
1. Replaced IP65 Ethernet drivers with Contiki drivers. * CS8900A The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and removes received frames from the chip if there's no room to send frames. * LAN91C96 The Contiki driver was used by IP65 more or less unchanged in the first place. * W5100 The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and stays clear from the W5100 hybrid mode. It presumes a fully functional W5100 register auto-increment and pre-calculates necessary W5100 frame buffer wrap-arounds and thus achieves the maximal 6502 <-> W5100 transfer speed.
2014-06-12 22:00:53 +00:00
; Copyright (c) 2003-2007, Adam Dunkels, Josef Soucek 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>, Josef Soucek <josef.soucek@ide64.org>,
; Oliver Schmidt <ol.sc@web.de>
;
;---------------------------------------------------------------------
.macpack module
module_header _lan91c96
; Driver signature
.byte $65, $74, $68 ; "eth"
.byte $01 ; Ethernet driver API version number
; Ethernet address
mac: .byte $00, $80, $0F ; OUI of Standard Microsystems
With per-target Ethernet drivers we can have per-target MAC addresses.
2019-05-05 08:41:57 +00:00
.ifdef __C64__
.byte $64, $64, $64
.endif
Added support for the C128. Those two drivers are used by Contiki for the C128 - and we want to keep the driver sources identical.
2019-05-08 15:16:39 +00:00
.ifdef __C128__
.byte $28, $28, $28
.endif
With per-target Ethernet drivers we can have per-target MAC addresses.
2019-05-05 08:41:57 +00:00
.ifdef __APPLE2__
.byte $A2, $A2, $A2
.endif
1. Replaced IP65 Ethernet drivers with Contiki drivers. * CS8900A The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and removes received frames from the chip if there's no room to send frames. * LAN91C96 The Contiki driver was used by IP65 more or less unchanged in the first place. * W5100 The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and stays clear from the W5100 hybrid mode. It presumes a fully functional W5100 register auto-increment and pre-calculates necessary W5100 frame buffer wrap-arounds and thus achieves the maximal 6502 <-> W5100 transfer speed.
2014-06-12 22:00:53 +00:00
; Buffer attributes
bufaddr:.res 2 ; Address
bufsize:.res 2 ; Size
; Jump table.
jmp init
jmp poll
jmp send
jmp exit
;---------------------------------------------------------------------
.if DYN_DRV
Distilled IP65 out of NETBOOT65.
2013-12-13 21:24:03 +00:00
1. Replaced IP65 Ethernet drivers with Contiki drivers. * CS8900A The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and removes received frames from the chip if there's no room to send frames. * LAN91C96 The Contiki driver was used by IP65 more or less unchanged in the first place. * W5100 The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and stays clear from the W5100 hybrid mode. It presumes a fully functional W5100 register auto-increment and pre-calculates necessary W5100 frame buffer wrap-arounds and thus achieves the maximal 6502 <-> W5100 transfer speed.
2014-06-12 22:00:53 +00:00
.zeropage
sp: .res 2 ; Stack pointer (Do not trash !)
reg: .res 2 ; Address of register base
ptr: .res 2 ; Indirect addressing pointer
len: .res 2 ; Frame length
Distilled IP65 out of NETBOOT65.
2013-12-13 21:24:03 +00:00
1. Replaced IP65 Ethernet drivers with Contiki drivers. * CS8900A The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and removes received frames from the chip if there's no room to send frames. * LAN91C96 The Contiki driver was used by IP65 more or less unchanged in the first place. * W5100 The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and stays clear from the W5100 hybrid mode. It presumes a fully functional W5100 register auto-increment and pre-calculates necessary W5100 frame buffer wrap-arounds and thus achieves the maximal 6502 <-> W5100 transfer speed.
2014-06-12 22:00:53 +00:00
.else
Distilled IP65 out of NETBOOT65.
2013-12-13 21:24:03 +00:00
1. Replaced IP65 Ethernet drivers with Contiki drivers. * CS8900A The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and removes received frames from the chip if there's no room to send frames. * LAN91C96 The Contiki driver was used by IP65 more or less unchanged in the first place. * W5100 The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and stays clear from the W5100 hybrid mode. It presumes a fully functional W5100 register auto-increment and pre-calculates necessary W5100 frame buffer wrap-arounds and thus achieves the maximal 6502 <-> W5100 transfer speed.
2014-06-12 22:00:53 +00:00
.include "zeropage.inc"
Fixed hardware detection. The previous chip detection was inspired by the old IP65 driver code. For some reason it didn't work as expected. The new code is simpler and based on this statement in the chip datasheet: "The upper byte always reads as 33h and can be used to help determine the I/O location of the LAN91C96."
2014-07-12 09:27:01 +00:00
reg := ptr1 ; Address of register base
1. Replaced IP65 Ethernet drivers with Contiki drivers. * CS8900A The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and removes received frames from the chip if there's no room to send frames. * LAN91C96 The Contiki driver was used by IP65 more or less unchanged in the first place. * W5100 The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and stays clear from the W5100 hybrid mode. It presumes a fully functional W5100 register auto-increment and pre-calculates necessary W5100 frame buffer wrap-arounds and thus achieves the maximal 6502 <-> W5100 transfer speed.
2014-06-12 22:00:53 +00:00
ptr := ptr2 ; Indirect addressing pointer
len := ptr3 ; Frame length
General source code cleanup. - Tab chars were partially used with the unusual width of two blanks. I removed them altogether. - Line endings were inconsistent even iniside individual files. I normalized them. - I introduced a consistent coding style regarding comment indenting and blank line usage. - I removed trailing spaces. - I removed newlines following unnamed labels. - ...
2013-12-27 13:57:56 +00:00
1. Replaced IP65 Ethernet drivers with Contiki drivers. * CS8900A The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and removes received frames from the chip if there's no room to send frames. * LAN91C96 The Contiki driver was used by IP65 more or less unchanged in the first place. * W5100 The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and stays clear from the W5100 hybrid mode. It presumes a fully functional W5100 register auto-increment and pre-calculates necessary W5100 frame buffer wrap-arounds and thus achieves the maximal 6502 <-> W5100 transfer speed.
2014-06-12 22:00:53 +00:00
.endif
General source code cleanup. - Tab chars were partially used with the unusual width of two blanks. I removed them altogether. - Line endings were inconsistent even iniside individual files. I normalized them. - I introduced a consistent coding style regarding comment indenting and blank line usage. - I removed trailing spaces. - I removed newlines following unnamed labels. - ...
2013-12-27 13:57:56 +00:00
Now that we have per-target Ethernet drivers we can omit initialization code necessary only for a certain card/cart from all the other drivers for the same Ethernet chip. This is especially true for the code self-modification only necessary on the Apple II to accommodate to the multiple slots. Note: The whole chip base address handling will be overhauled in subsequent changes.
2019-04-30 16:54:21 +00:00
;=====================================================================
Added support for the C128. Those two drivers are used by Contiki for the C128 - and we want to keep the driver sources identical.
2019-05-08 15:16:39 +00:00
.if .defined (__C64__) .or .defined (__C128__)
Now that we have per-target Ethernet drivers we can omit initialization code necessary only for a certain card/cart from all the other drivers for the same Ethernet chip. This is especially true for the code self-modification only necessary on the Apple II to accommodate to the multiple slots. Note: The whole chip base address handling will be overhauled in subsequent changes.
2019-04-30 16:54:21 +00:00
ethbsr := $DE0E ; Bank select register R/W (2B)
; Register bank 0
ethtcr := $DE00 ; Transmition control register R/W (2B)
ethephsr := $DE02 ; EPH status register R/O (2B)
ethrcr := $DE04 ; Receive control register R/W (2B)
ethecr := $DE06 ; Counter register R/O (2B)
ethmir := $DE08 ; Memory information register R/O (2B)
ethmcr := $DE0A ; Memory Config. reg. +0 R/W +1 R/O (2B)
; Register bank 1
ethcr := $DE00 ; Configuration register R/W (2B)
ethbar := $DE02 ; Base address register R/W (2B)
ethiar := $DE04 ; Individual address register R/W (6B)
ethgpr := $DE0A ; General address register R/W (2B)
ethctr := $DE0C ; Control register R/W (2B)
; Register bank 2
ethmmucr := $DE00 ; MMU command register W/O (1B)
ethautotx := $DE01 ; AUTO TX start register R/W (1B)
ethpnr := $DE02 ; Packet number register R/W (1B)
etharr := $DE03 ; Allocation result register R/O (1B)
ethfifo := $DE04 ; FIFO ports register R/O (2B)
ethptr := $DE06 ; Pointer register R/W (2B)
ethdata := $DE08 ; Data register R/W (4B)
ethist := $DE0C ; Interrupt status register R/O (1B)
ethack := $DE0C ; Interrupt acknowledge register W/O (1B)
ethmsk := $DE0D ; Interrupt mask register R/W (1B)
; Register bank 3
ethmt := $DE00 ; Multicast table R/W (8B)
ethmgmt := $DE08 ; Management interface R/W (2B)
ethrev := $DE0A ; Revision register R/W (2B)
ethercv := $DE0C ; Early RCV register R/W (2B)
1. Replaced IP65 Ethernet drivers with Contiki drivers. * CS8900A The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and removes received frames from the chip if there's no room to send frames. * LAN91C96 The Contiki driver was used by IP65 more or less unchanged in the first place. * W5100 The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and stays clear from the W5100 hybrid mode. It presumes a fully functional W5100 register auto-increment and pre-calculates necessary W5100 frame buffer wrap-arounds and thus achieves the maximal 6502 <-> W5100 transfer speed.
2014-06-12 22:00:53 +00:00
;---------------------------------------------------------------------
Now that we have per-target Ethernet drivers we can omit initialization code necessary only for a certain card/cart from all the other drivers for the same Ethernet chip. This is especially true for the code self-modification only necessary on the Apple II to accommodate to the multiple slots. Note: The whole chip base address handling will be overhauled in subsequent changes.
2019-04-30 16:54:21 +00:00
.code
init:
.endif
;=====================================================================
.ifdef __APPLE2__
1. Replaced IP65 Ethernet drivers with Contiki drivers. * CS8900A The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and removes received frames from the chip if there's no room to send frames. * LAN91C96 The Contiki driver was used by IP65 more or less unchanged in the first place. * W5100 The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and stays clear from the W5100 hybrid mode. It presumes a fully functional W5100 register auto-increment and pre-calculates necessary W5100 frame buffer wrap-arounds and thus achieves the maximal 6502 <-> W5100 transfer speed.
2014-06-12 22:00:53 +00:00
.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
Remove received packet(s) to allow to send one. Behave just like the CS8900A driver: Both the CS8900A and the LAN91C96 dynamically share a buffer for received packets and packets to be send. If the chip is exposed to a network with a lot of broadcasts the shared buffer might fill quicker with received packets than the 6502 reads them (via polling). So we might need to drop some received packets in order to be able to send anything at all.
2015-04-13 19:09:15 +00:00
.byte fixup38-fixup37, fixup39-fixup38
1. Replaced IP65 Ethernet drivers with Contiki drivers. * CS8900A The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and removes received frames from the chip if there's no room to send frames. * LAN91C96 The Contiki driver was used by IP65 more or less unchanged in the first place. * W5100 The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and stays clear from the W5100 hybrid mode. It presumes a fully functional W5100 register auto-increment and pre-calculates necessary W5100 frame buffer wrap-arounds and thus achieves the maximal 6502 <-> W5100 transfer speed.
2014-06-12 22:00:53 +00:00
fixups = * - fixup
;---------------------------------------------------------------------
Removed Ethernet driver I/O base. So far the base address of the Ethernet chip was a general property of all Ethernet drivers. It served two purposes: 1. Allowing to use a single Ethernet driver for a certain Ethernet chip, no matter what machine was connected to the chip. 2. Allowing use an Ethernet card in all Apple II slots. However, we now use customized Ethernet drivers for the individual machines so 1.) isn't relevant anymore. In fact one wants to omit the overhead of a runtime-adjustable base address where it isn't needed. So only the Apple II slots are left. But this should rather be a driver-internal approach then. We should just hand the driver the slot number the user wants to use and have the driver do its thing. Independently from the aspect if the driver parameter is a base address or a slot number the parameter handling was changed too. For asm programs there was so far a specific init function to be called prior to the main init function if it was desired to chnage the parameter default. This was done to keep the main init function backward compatible. But now that the parameter (now the slot number) is only used on the Apple II anyhow it seems reasonable to drop the specific init function again and just provide the parameter to the main init function. All C64-only user code can stay as-is. Only Apple II user code needs to by adjusted. Please note that this change only affects asm programs, C programs always used a single init function with the Apple II slot number as parameter.
2019-05-02 12:44:24 +00:00
; The addresses are fixed up at runtime
ethbsr := $C08E ; Bank select register R/W (2B)
Distilled IP65 out of NETBOOT65.
2013-12-13 21:24:03 +00:00
; Register bank 0
Removed Ethernet driver I/O base. So far the base address of the Ethernet chip was a general property of all Ethernet drivers. It served two purposes: 1. Allowing to use a single Ethernet driver for a certain Ethernet chip, no matter what machine was connected to the chip. 2. Allowing use an Ethernet card in all Apple II slots. However, we now use customized Ethernet drivers for the individual machines so 1.) isn't relevant anymore. In fact one wants to omit the overhead of a runtime-adjustable base address where it isn't needed. So only the Apple II slots are left. But this should rather be a driver-internal approach then. We should just hand the driver the slot number the user wants to use and have the driver do its thing. Independently from the aspect if the driver parameter is a base address or a slot number the parameter handling was changed too. For asm programs there was so far a specific init function to be called prior to the main init function if it was desired to chnage the parameter default. This was done to keep the main init function backward compatible. But now that the parameter (now the slot number) is only used on the Apple II anyhow it seems reasonable to drop the specific init function again and just provide the parameter to the main init function. All C64-only user code can stay as-is. Only Apple II user code needs to by adjusted. Please note that this change only affects asm programs, C programs always used a single init function with the Apple II slot number as parameter.
2019-05-02 12:44:24 +00:00
ethtcr := $C080 ; Transmition control register R/W (2B)
ethephsr := $C082 ; EPH status register R/O (2B)
ethrcr := $C084 ; Receive control register R/W (2B)
ethecr := $C086 ; Counter register R/O (2B)
ethmir := $C088 ; Memory information register R/O (2B)
ethmcr := $C08A ; Memory Config. reg. +0 R/W +1 R/O (2B)
Distilled IP65 out of NETBOOT65.
2013-12-13 21:24:03 +00:00
; Register bank 1
Removed Ethernet driver I/O base. So far the base address of the Ethernet chip was a general property of all Ethernet drivers. It served two purposes: 1. Allowing to use a single Ethernet driver for a certain Ethernet chip, no matter what machine was connected to the chip. 2. Allowing use an Ethernet card in all Apple II slots. However, we now use customized Ethernet drivers for the individual machines so 1.) isn't relevant anymore. In fact one wants to omit the overhead of a runtime-adjustable base address where it isn't needed. So only the Apple II slots are left. But this should rather be a driver-internal approach then. We should just hand the driver the slot number the user wants to use and have the driver do its thing. Independently from the aspect if the driver parameter is a base address or a slot number the parameter handling was changed too. For asm programs there was so far a specific init function to be called prior to the main init function if it was desired to chnage the parameter default. This was done to keep the main init function backward compatible. But now that the parameter (now the slot number) is only used on the Apple II anyhow it seems reasonable to drop the specific init function again and just provide the parameter to the main init function. All C64-only user code can stay as-is. Only Apple II user code needs to by adjusted. Please note that this change only affects asm programs, C programs always used a single init function with the Apple II slot number as parameter.
2019-05-02 12:44:24 +00:00
ethcr := $C080 ; Configuration register R/W (2B)
ethbar := $C082 ; Base address register R/W (2B)
ethiar := $C084 ; Individual address register R/W (6B)
ethgpr := $C08A ; General address register R/W (2B)
ethctr := $C08C ; Control register R/W (2B)
Distilled IP65 out of NETBOOT65.
2013-12-13 21:24:03 +00:00
; Register bank 2
Removed Ethernet driver I/O base. So far the base address of the Ethernet chip was a general property of all Ethernet drivers. It served two purposes: 1. Allowing to use a single Ethernet driver for a certain Ethernet chip, no matter what machine was connected to the chip. 2. Allowing use an Ethernet card in all Apple II slots. However, we now use customized Ethernet drivers for the individual machines so 1.) isn't relevant anymore. In fact one wants to omit the overhead of a runtime-adjustable base address where it isn't needed. So only the Apple II slots are left. But this should rather be a driver-internal approach then. We should just hand the driver the slot number the user wants to use and have the driver do its thing. Independently from the aspect if the driver parameter is a base address or a slot number the parameter handling was changed too. For asm programs there was so far a specific init function to be called prior to the main init function if it was desired to chnage the parameter default. This was done to keep the main init function backward compatible. But now that the parameter (now the slot number) is only used on the Apple II anyhow it seems reasonable to drop the specific init function again and just provide the parameter to the main init function. All C64-only user code can stay as-is. Only Apple II user code needs to by adjusted. Please note that this change only affects asm programs, C programs always used a single init function with the Apple II slot number as parameter.
2019-05-02 12:44:24 +00:00
ethmmucr := $C080 ; MMU command register W/O (1B)
ethautotx := $C081 ; AUTO TX start register R/W (1B)
ethpnr := $C082 ; Packet number register R/W (1B)
etharr := $C083 ; Allocation result register R/O (1B)
ethfifo := $C084 ; FIFO ports register R/O (2B)
ethptr := $C086 ; Pointer register R/W (2B)
ethdata := $C088 ; Data register R/W (4B)
ethist := $C08C ; Interrupt status register R/O (1B)
ethack := $C08C ; Interrupt acknowledge register W/O (1B)
ethmsk := $C08D ; Interrupt mask register R/W (1B)
Distilled IP65 out of NETBOOT65.
2013-12-13 21:24:03 +00:00
; Register bank 3
Removed Ethernet driver I/O base. So far the base address of the Ethernet chip was a general property of all Ethernet drivers. It served two purposes: 1. Allowing to use a single Ethernet driver for a certain Ethernet chip, no matter what machine was connected to the chip. 2. Allowing use an Ethernet card in all Apple II slots. However, we now use customized Ethernet drivers for the individual machines so 1.) isn't relevant anymore. In fact one wants to omit the overhead of a runtime-adjustable base address where it isn't needed. So only the Apple II slots are left. But this should rather be a driver-internal approach then. We should just hand the driver the slot number the user wants to use and have the driver do its thing. Independently from the aspect if the driver parameter is a base address or a slot number the parameter handling was changed too. For asm programs there was so far a specific init function to be called prior to the main init function if it was desired to chnage the parameter default. This was done to keep the main init function backward compatible. But now that the parameter (now the slot number) is only used on the Apple II anyhow it seems reasonable to drop the specific init function again and just provide the parameter to the main init function. All C64-only user code can stay as-is. Only Apple II user code needs to by adjusted. Please note that this change only affects asm programs, C programs always used a single init function with the Apple II slot number as parameter.
2019-05-02 12:44:24 +00:00
ethmt := $C080 ; Multicast table R/W (8B)
ethmgmt := $C088 ; Management interface R/W (2B)
ethrev := $C08A ; Revision register R/W (2B)
ethercv := $C08C ; Early RCV register R/W (2B)
1. Replaced IP65 Ethernet drivers with Contiki drivers. * CS8900A The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and removes received frames from the chip if there's no room to send frames. * LAN91C96 The Contiki driver was used by IP65 more or less unchanged in the first place. * W5100 The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and stays clear from the W5100 hybrid mode. It presumes a fully functional W5100 register auto-increment and pre-calculates necessary W5100 frame buffer wrap-arounds and thus achieves the maximal 6502 <-> W5100 transfer speed.
2014-06-12 22:00:53 +00:00
;---------------------------------------------------------------------
Removed Ethernet driver I/O base. So far the base address of the Ethernet chip was a general property of all Ethernet drivers. It served two purposes: 1. Allowing to use a single Ethernet driver for a certain Ethernet chip, no matter what machine was connected to the chip. 2. Allowing use an Ethernet card in all Apple II slots. However, we now use customized Ethernet drivers for the individual machines so 1.) isn't relevant anymore. In fact one wants to omit the overhead of a runtime-adjustable base address where it isn't needed. So only the Apple II slots are left. But this should rather be a driver-internal approach then. We should just hand the driver the slot number the user wants to use and have the driver do its thing. Independently from the aspect if the driver parameter is a base address or a slot number the parameter handling was changed too. For asm programs there was so far a specific init function to be called prior to the main init function if it was desired to chnage the parameter default. This was done to keep the main init function backward compatible. But now that the parameter (now the slot number) is only used on the Apple II anyhow it seems reasonable to drop the specific init function again and just provide the parameter to the main init function. All C64-only user code can stay as-is. Only Apple II user code needs to by adjusted. Please note that this change only affects asm programs, C programs always used a single init function with the Apple II slot number as parameter.
2019-05-02 12:44:24 +00:00
.data
1. Replaced IP65 Ethernet drivers with Contiki drivers. * CS8900A The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and removes received frames from the chip if there's no room to send frames. * LAN91C96 The Contiki driver was used by IP65 more or less unchanged in the first place. * W5100 The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and stays clear from the W5100 hybrid mode. It presumes a fully functional W5100 register auto-increment and pre-calculates necessary W5100 frame buffer wrap-arounds and thus achieves the maximal 6502 <-> W5100 transfer speed.
2014-06-12 22:00:53 +00:00
init:
Removed Ethernet driver I/O base. So far the base address of the Ethernet chip was a general property of all Ethernet drivers. It served two purposes: 1. Allowing to use a single Ethernet driver for a certain Ethernet chip, no matter what machine was connected to the chip. 2. Allowing use an Ethernet card in all Apple II slots. However, we now use customized Ethernet drivers for the individual machines so 1.) isn't relevant anymore. In fact one wants to omit the overhead of a runtime-adjustable base address where it isn't needed. So only the Apple II slots are left. But this should rather be a driver-internal approach then. We should just hand the driver the slot number the user wants to use and have the driver do its thing. Independently from the aspect if the driver parameter is a base address or a slot number the parameter handling was changed too. For asm programs there was so far a specific init function to be called prior to the main init function if it was desired to chnage the parameter default. This was done to keep the main init function backward compatible. But now that the parameter (now the slot number) is only used on the Apple II anyhow it seems reasonable to drop the specific init function again and just provide the parameter to the main init function. All C64-only user code can stay as-is. Only Apple II user code needs to by adjusted. Please note that this change only affects asm programs, C programs always used a single init function with the Apple II slot number as parameter.
2019-05-02 12:44:24 +00:00
; Convert slot number to slot I/O offset
asl
asl
asl
asl
1. Replaced IP65 Ethernet drivers with Contiki drivers. * CS8900A The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and removes received frames from the chip if there's no room to send frames. * LAN91C96 The Contiki driver was used by IP65 more or less unchanged in the first place. * W5100 The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and stays clear from the W5100 hybrid mode. It presumes a fully functional W5100 register auto-increment and pre-calculates necessary W5100 frame buffer wrap-arounds and thus achieves the maximal 6502 <-> W5100 transfer speed.
2014-06-12 22:00:53 +00:00
sta reg
; Start with first fixup location
lda #<(fixup01+1)
ldx #>(fixup01+1)
sta ptr
stx ptr+1
ldx #$FF
ldy #$00
; Fixup address at location
Allow fixup to be repeated. There are scenarios in which it is beneficial to search for an Etherne chip at several i/o locations. To do so the chip initialization is performed at several i/o locations until it succeeds. In order to allow for that operation model the i/o location fixup needs to be repeatable. Note: This won't work with the RR-Net because the fixup bits overlap with the chip i/o bits.
2015-07-08 13:42:42 +00:00
: lda (ptr),y
Removed Ethernet driver I/O base. So far the base address of the Ethernet chip was a general property of all Ethernet drivers. It served two purposes: 1. Allowing to use a single Ethernet driver for a certain Ethernet chip, no matter what machine was connected to the chip. 2. Allowing use an Ethernet card in all Apple II slots. However, we now use customized Ethernet drivers for the individual machines so 1.) isn't relevant anymore. In fact one wants to omit the overhead of a runtime-adjustable base address where it isn't needed. So only the Apple II slots are left. But this should rather be a driver-internal approach then. We should just hand the driver the slot number the user wants to use and have the driver do its thing. Independently from the aspect if the driver parameter is a base address or a slot number the parameter handling was changed too. For asm programs there was so far a specific init function to be called prior to the main init function if it was desired to chnage the parameter default. This was done to keep the main init function backward compatible. But now that the parameter (now the slot number) is only used on the Apple II anyhow it seems reasonable to drop the specific init function again and just provide the parameter to the main init function. All C64-only user code can stay as-is. Only Apple II user code needs to by adjusted. Please note that this change only affects asm programs, C programs always used a single init function with the Apple II slot number as parameter.
2019-05-02 12:44:24 +00:00
and #%10001111 ; Allow for re-init
Allow fixup to be repeated. There are scenarios in which it is beneficial to search for an Etherne chip at several i/o locations. To do so the chip initialization is performed at several i/o locations until it succeeds. In order to allow for that operation model the i/o location fixup needs to be repeatable. Note: This won't work with the RR-Net because the fixup bits overlap with the chip i/o bits.
2015-07-08 13:42:42 +00:00
ora reg
1. Replaced IP65 Ethernet drivers with Contiki drivers. * CS8900A The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and removes received frames from the chip if there's no room to send frames. * LAN91C96 The Contiki driver was used by IP65 more or less unchanged in the first place. * W5100 The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and stays clear from the W5100 hybrid mode. It presumes a fully functional W5100 register auto-increment and pre-calculates necessary W5100 frame buffer wrap-arounds and thus achieves the maximal 6502 <-> W5100 transfer speed.
2014-06-12 22:00:53 +00:00
sta (ptr),y
; Advance to next fixup location
inx
cpx #fixups
bcs :+
lda ptr
clc
adc fixup,x
sta ptr
bcc :-
inc ptr+1
bcs :- ; Always
Now that we have per-target Ethernet drivers we can omit initialization code necessary only for a certain card/cart from all the other drivers for the same Ethernet chip. This is especially true for the code self-modification only necessary on the Apple II to accommodate to the multiple slots. Note: The whole chip base address handling will be overhauled in subsequent changes.
2019-04-30 16:54:21 +00:00
:
.endif
;=====================================================================
1. Replaced IP65 Ethernet drivers with Contiki drivers. * CS8900A The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and removes received frames from the chip if there's no room to send frames. * LAN91C96 The Contiki driver was used by IP65 more or less unchanged in the first place. * W5100 The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and stays clear from the W5100 hybrid mode. It presumes a fully functional W5100 register auto-increment and pre-calculates necessary W5100 frame buffer wrap-arounds and thus achieves the maximal 6502 <-> W5100 transfer speed.
2014-06-12 22:00:53 +00:00
Fixed hardware detection. The previous chip detection was inspired by the old IP65 driver code. For some reason it didn't work as expected. The new code is simpler and based on this statement in the chip datasheet: "The upper byte always reads as 33h and can be used to help determine the I/O location of the LAN91C96."
2014-07-12 09:27:01 +00:00
; Check bank select register upper byte to always read as $33
Now that we have per-target Ethernet drivers we can omit initialization code necessary only for a certain card/cart from all the other drivers for the same Ethernet chip. This is especially true for the code self-modification only necessary on the Apple II to accommodate to the multiple slots. Note: The whole chip base address handling will be overhauled in subsequent changes.
2019-04-30 16:54:21 +00:00
ldy #$00
Fixed hardware detection. The previous chip detection was inspired by the old IP65 driver code. For some reason it didn't work as expected. The new code is simpler and based on this statement in the chip datasheet: "The upper byte always reads as 33h and can be used to help determine the I/O location of the LAN91C96."
2014-07-12 09:27:01 +00:00
fixup01:sty ethbsr+1
fixup02:lda ethbsr+1
cmp #$33
beq :+
sec
rts
1. Replaced IP65 Ethernet drivers with Contiki drivers. * CS8900A The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and removes received frames from the chip if there's no room to send frames. * LAN91C96 The Contiki driver was used by IP65 more or less unchanged in the first place. * W5100 The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and stays clear from the W5100 hybrid mode. It presumes a fully functional W5100 register auto-increment and pre-calculates necessary W5100 frame buffer wrap-arounds and thus achieves the maximal 6502 <-> W5100 transfer speed.
2014-06-12 22:00:53 +00:00
; Reset ETH card
Fixed hardware detection. The previous chip detection was inspired by the old IP65 driver code. For some reason it didn't work as expected. The new code is simpler and based on this statement in the chip datasheet: "The upper byte always reads as 33h and can be used to help determine the I/O location of the LAN91C96."
2014-07-12 09:27:01 +00:00
: ; Bank 0
fixup03:sty ethbsr
1. Replaced IP65 Ethernet drivers with Contiki drivers. * CS8900A The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and removes received frames from the chip if there's no room to send frames. * LAN91C96 The Contiki driver was used by IP65 more or less unchanged in the first place. * W5100 The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and stays clear from the W5100 hybrid mode. It presumes a fully functional W5100 register auto-increment and pre-calculates necessary W5100 frame buffer wrap-arounds and thus achieves the maximal 6502 <-> W5100 transfer speed.
2014-06-12 22:00:53 +00:00
lda #%10000000 ; Software reset
Fixed hardware detection. The previous chip detection was inspired by the old IP65 driver code. For some reason it didn't work as expected. The new code is simpler and based on this statement in the chip datasheet: "The upper byte always reads as 33h and can be used to help determine the I/O location of the LAN91C96."
2014-07-12 09:27:01 +00:00
fixup04:sta ethrcr+1
1. Replaced IP65 Ethernet drivers with Contiki drivers. * CS8900A The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and removes received frames from the chip if there's no room to send frames. * LAN91C96 The Contiki driver was used by IP65 more or less unchanged in the first place. * W5100 The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and stays clear from the W5100 hybrid mode. It presumes a fully functional W5100 register auto-increment and pre-calculates necessary W5100 frame buffer wrap-arounds and thus achieves the maximal 6502 <-> W5100 transfer speed.
2014-06-12 22:00:53 +00:00
Fixed hardware detection. The previous chip detection was inspired by the old IP65 driver code. For some reason it didn't work as expected. The new code is simpler and based on this statement in the chip datasheet: "The upper byte always reads as 33h and can be used to help determine the I/O location of the LAN91C96."
2014-07-12 09:27:01 +00:00
fixup05:sty ethrcr
fixup06:sty ethrcr+1
1. Replaced IP65 Ethernet drivers with Contiki drivers. * CS8900A The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and removes received frames from the chip if there's no room to send frames. * LAN91C96 The Contiki driver was used by IP65 more or less unchanged in the first place. * W5100 The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and stays clear from the W5100 hybrid mode. It presumes a fully functional W5100 register auto-increment and pre-calculates necessary W5100 frame buffer wrap-arounds and thus achieves the maximal 6502 <-> W5100 transfer speed.
2014-06-12 22:00:53 +00:00
; Delay
: cmp ($FF,x) ; 6 cycles
cmp ($FF,x) ; 6 cycles
iny ; 2 cycles
bne :- ; 3 cycles
; 17 * 256 = 4352 -> 4,4 ms
; Enable transmit and receive
lda #%10000001 ; Enable transmit TXENA, PAD_EN
ldx #%00000011 ; Enable receive, strip CRC ???
Fixed hardware detection. The previous chip detection was inspired by the old IP65 driver code. For some reason it didn't work as expected. The new code is simpler and based on this statement in the chip datasheet: "The upper byte always reads as 33h and can be used to help determine the I/O location of the LAN91C96."
2014-07-12 09:27:01 +00:00
fixup07:sta ethtcr
fixup08:stx ethrcr+1
1. Replaced IP65 Ethernet drivers with Contiki drivers. * CS8900A The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and removes received frames from the chip if there's no room to send frames. * LAN91C96 The Contiki driver was used by IP65 more or less unchanged in the first place. * W5100 The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and stays clear from the W5100 hybrid mode. It presumes a fully functional W5100 register auto-increment and pre-calculates necessary W5100 frame buffer wrap-arounds and thus achieves the maximal 6502 <-> W5100 transfer speed.
2014-06-12 22:00:53 +00:00
lda #$01 ; Bank 1
Fixed hardware detection. The previous chip detection was inspired by the old IP65 driver code. For some reason it didn't work as expected. The new code is simpler and based on this statement in the chip datasheet: "The upper byte always reads as 33h and can be used to help determine the I/O location of the LAN91C96."
2014-07-12 09:27:01 +00:00
fixup09:sta ethbsr
1. Replaced IP65 Ethernet drivers with Contiki drivers. * CS8900A The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and removes received frames from the chip if there's no room to send frames. * LAN91C96 The Contiki driver was used by IP65 more or less unchanged in the first place. * W5100 The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and stays clear from the W5100 hybrid mode. It presumes a fully functional W5100 register auto-increment and pre-calculates necessary W5100 frame buffer wrap-arounds and thus achieves the maximal 6502 <-> W5100 transfer speed.
2014-06-12 22:00:53 +00:00
fixup10:lda ethcr+1
ora #%00010000 ; No wait (IOCHRDY)
fixup11:sta ethcr+1
lda #%00001001 ; Auto release
fixup12:sta ethctr+1
; Set MAC address
ldy #$00
: lda mac,y
fixup13:sta ethiar,y
iny
cpy #$06
bcc :-
; Set interrupt mask
lda #$02 ; Bank 2
fixup14:sta ethbsr
lda #%00000000 ; No interrupts
fixup15:sta ethmsk
tax
clc
rts
;---------------------------------------------------------------------
poll:
fixup16:lda ethist
and #%00000001 ; RCV INT
beq :+
; Process the incoming packet
; ---------------------------
lda #$00
ldx #%11100000 ; RCV, AUTO INCR., READ
fixup17:sta ethptr
fixup18:stx ethptr+1
; Last word contains 'last data byte' and $60 or 'fill byte' and $40
fixup19:lda ethdata ; Status word
fixup20:lda ethdata ; Need high byte only
; Move ODDFRM bit into carry:
; - Even packet length -> carry clear -> subtract 6 bytes
; - Odd packet length -> carry set -> subtract 5 bytes
lsr
lsr
lsr
lsr
lsr
; The packet contains 3 extra words
fixup21:lda ethdata ; Total number of bytes
sbc #$05 ; Actually 5 or 6 depending on carry
sta len
fixup22:lda ethdata
sbc #$00
sta len+1
; Is bufsize < len ?
lda bufsize
cmp len
lda bufsize+1
sbc len+1
bcs :++
; Yes, skip packet
Remove received packet(s) to allow to send one. Behave just like the CS8900A driver: Both the CS8900A and the LAN91C96 dynamically share a buffer for received packets and packets to be send. If the chip is exposed to a network with a lot of broadcasts the shared buffer might fill quicker with received packets than the 6502 reads them (via polling). So we might need to drop some received packets in order to be able to send anything at all.
2015-04-13 19:09:15 +00:00
jsr releasepacket
1. Replaced IP65 Ethernet drivers with Contiki drivers. * CS8900A The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and removes received frames from the chip if there's no room to send frames. * LAN91C96 The Contiki driver was used by IP65 more or less unchanged in the first place. * W5100 The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and stays clear from the W5100 hybrid mode. It presumes a fully functional W5100 register auto-increment and pre-calculates necessary W5100 frame buffer wrap-arounds and thus achieves the maximal 6502 <-> W5100 transfer speed.
2014-06-12 22:00:53 +00:00
; No packet available
lda #$00
: tax
sec
rts
; Read bytes into buffer
: jsr adjustptr
:
Remove received packet(s) to allow to send one. Behave just like the CS8900A driver: Both the CS8900A and the LAN91C96 dynamically share a buffer for received packets and packets to be send. If the chip is exposed to a network with a lot of broadcasts the shared buffer might fill quicker with received packets than the 6502 reads them (via polling). So we might need to drop some received packets in order to be able to send anything at all.
2015-04-13 19:09:15 +00:00
fixup23:lda ethdata
1. Replaced IP65 Ethernet drivers with Contiki drivers. * CS8900A The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and removes received frames from the chip if there's no room to send frames. * LAN91C96 The Contiki driver was used by IP65 more or less unchanged in the first place. * W5100 The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and stays clear from the W5100 hybrid mode. It presumes a fully functional W5100 register auto-increment and pre-calculates necessary W5100 frame buffer wrap-arounds and thus achieves the maximal 6502 <-> W5100 transfer speed.
2014-06-12 22:00:53 +00:00
sta (ptr),y
iny
bne :-
inc ptr+1
dex
bpl :-
; Remove and release RX packet from the FIFO
Remove received packet(s) to allow to send one. Behave just like the CS8900A driver: Both the CS8900A and the LAN91C96 dynamically share a buffer for received packets and packets to be send. If the chip is exposed to a network with a lot of broadcasts the shared buffer might fill quicker with received packets than the 6502 reads them (via polling). So we might need to drop some received packets in order to be able to send anything at all.
2015-04-13 19:09:15 +00:00
jsr releasepacket
1. Replaced IP65 Ethernet drivers with Contiki drivers. * CS8900A The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and removes received frames from the chip if there's no room to send frames. * LAN91C96 The Contiki driver was used by IP65 more or less unchanged in the first place. * W5100 The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and stays clear from the W5100 hybrid mode. It presumes a fully functional W5100 register auto-increment and pre-calculates necessary W5100 frame buffer wrap-arounds and thus achieves the maximal 6502 <-> W5100 transfer speed.
2014-06-12 22:00:53 +00:00
; Return packet length
lda len
ldx len+1
clc
rts
;---------------------------------------------------------------------
send:
; Save packet length
sta len
stx len+1
; Allocate memory for TX
txa
ora #%00100000
Remove received packet(s) to allow to send one. Behave just like the CS8900A driver: Both the CS8900A and the LAN91C96 dynamically share a buffer for received packets and packets to be send. If the chip is exposed to a network with a lot of broadcasts the shared buffer might fill quicker with received packets than the 6502 reads them (via polling). So we might need to drop some received packets in order to be able to send anything at all.
2015-04-13 19:09:15 +00:00
fixup24:sta ethmmucr
1. Replaced IP65 Ethernet drivers with Contiki drivers. * CS8900A The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and removes received frames from the chip if there's no room to send frames. * LAN91C96 The Contiki driver was used by IP65 more or less unchanged in the first place. * W5100 The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and stays clear from the W5100 hybrid mode. It presumes a fully functional W5100 register auto-increment and pre-calculates necessary W5100 frame buffer wrap-arounds and thus achieves the maximal 6502 <-> W5100 transfer speed.
2014-06-12 22:00:53 +00:00
; 8 retries
ldy #$08
; Wait for allocation ready
:
Remove received packet(s) to allow to send one. Behave just like the CS8900A driver: Both the CS8900A and the LAN91C96 dynamically share a buffer for received packets and packets to be send. If the chip is exposed to a network with a lot of broadcasts the shared buffer might fill quicker with received packets than the 6502 reads them (via polling). So we might need to drop some received packets in order to be able to send anything at all.
2015-04-13 19:09:15 +00:00
fixup25:lda ethist
1. Replaced IP65 Ethernet drivers with Contiki drivers. * CS8900A The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and removes received frames from the chip if there's no room to send frames. * LAN91C96 The Contiki driver was used by IP65 more or less unchanged in the first place. * W5100 The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and stays clear from the W5100 hybrid mode. It presumes a fully functional W5100 register auto-increment and pre-calculates necessary W5100 frame buffer wrap-arounds and thus achieves the maximal 6502 <-> W5100 transfer speed.
2014-06-12 22:00:53 +00:00
and #%00001000 ; ALLOC INT
bne :+
Remove received packet(s) to allow to send one. Behave just like the CS8900A driver: Both the CS8900A and the LAN91C96 dynamically share a buffer for received packets and packets to be send. If the chip is exposed to a network with a lot of broadcasts the shared buffer might fill quicker with received packets than the 6502 reads them (via polling). So we might need to drop some received packets in order to be able to send anything at all.
2015-04-13 19:09:15 +00:00
; No space avaliable, skip a received frame
jsr releasepacket
1. Replaced IP65 Ethernet drivers with Contiki drivers. * CS8900A The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and removes received frames from the chip if there's no room to send frames. * LAN91C96 The Contiki driver was used by IP65 more or less unchanged in the first place. * W5100 The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and stays clear from the W5100 hybrid mode. It presumes a fully functional W5100 register auto-increment and pre-calculates necessary W5100 frame buffer wrap-arounds and thus achieves the maximal 6502 <-> W5100 transfer speed.
2014-06-12 22:00:53 +00:00
; And try again
dey
bne :-
sec
rts
; Acknowledge interrupt, is it necessary ???
: lda #%00001000
Remove received packet(s) to allow to send one. Behave just like the CS8900A driver: Both the CS8900A and the LAN91C96 dynamically share a buffer for received packets and packets to be send. If the chip is exposed to a network with a lot of broadcasts the shared buffer might fill quicker with received packets than the 6502 reads them (via polling). So we might need to drop some received packets in order to be able to send anything at all.
2015-04-13 19:09:15 +00:00
fixup26:sta ethack
1. Replaced IP65 Ethernet drivers with Contiki drivers. * CS8900A The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and removes received frames from the chip if there's no room to send frames. * LAN91C96 The Contiki driver was used by IP65 more or less unchanged in the first place. * W5100 The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and stays clear from the W5100 hybrid mode. It presumes a fully functional W5100 register auto-increment and pre-calculates necessary W5100 frame buffer wrap-arounds and thus achieves the maximal 6502 <-> W5100 transfer speed.
2014-06-12 22:00:53 +00:00
; Set packet address
Remove received packet(s) to allow to send one. Behave just like the CS8900A driver: Both the CS8900A and the LAN91C96 dynamically share a buffer for received packets and packets to be send. If the chip is exposed to a network with a lot of broadcasts the shared buffer might fill quicker with received packets than the 6502 reads them (via polling). So we might need to drop some received packets in order to be able to send anything at all.
2015-04-13 19:09:15 +00:00
fixup27:lda etharr
fixup28:sta ethpnr
1. Replaced IP65 Ethernet drivers with Contiki drivers. * CS8900A The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and removes received frames from the chip if there's no room to send frames. * LAN91C96 The Contiki driver was used by IP65 more or less unchanged in the first place. * W5100 The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and stays clear from the W5100 hybrid mode. It presumes a fully functional W5100 register auto-increment and pre-calculates necessary W5100 frame buffer wrap-arounds and thus achieves the maximal 6502 <-> W5100 transfer speed.
2014-06-12 22:00:53 +00:00
lda #$00
ldx #%01000000 ; AUTO INCR.
Remove received packet(s) to allow to send one. Behave just like the CS8900A driver: Both the CS8900A and the LAN91C96 dynamically share a buffer for received packets and packets to be send. If the chip is exposed to a network with a lot of broadcasts the shared buffer might fill quicker with received packets than the 6502 reads them (via polling). So we might need to drop some received packets in order to be able to send anything at all.
2015-04-13 19:09:15 +00:00
fixup29:sta ethptr
fixup30:stx ethptr+1
1. Replaced IP65 Ethernet drivers with Contiki drivers. * CS8900A The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and removes received frames from the chip if there's no room to send frames. * LAN91C96 The Contiki driver was used by IP65 more or less unchanged in the first place. * W5100 The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and stays clear from the W5100 hybrid mode. It presumes a fully functional W5100 register auto-increment and pre-calculates necessary W5100 frame buffer wrap-arounds and thus achieves the maximal 6502 <-> W5100 transfer speed.
2014-06-12 22:00:53 +00:00
; Status written by CSMA
lda #$00
Remove received packet(s) to allow to send one. Behave just like the CS8900A driver: Both the CS8900A and the LAN91C96 dynamically share a buffer for received packets and packets to be send. If the chip is exposed to a network with a lot of broadcasts the shared buffer might fill quicker with received packets than the 6502 reads them (via polling). So we might need to drop some received packets in order to be able to send anything at all.
2015-04-13 19:09:15 +00:00
fixup31:sta ethdata
fixup32:sta ethdata
1. Replaced IP65 Ethernet drivers with Contiki drivers. * CS8900A The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and removes received frames from the chip if there's no room to send frames. * LAN91C96 The Contiki driver was used by IP65 more or less unchanged in the first place. * W5100 The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and stays clear from the W5100 hybrid mode. It presumes a fully functional W5100 register auto-increment and pre-calculates necessary W5100 frame buffer wrap-arounds and thus achieves the maximal 6502 <-> W5100 transfer speed.
2014-06-12 22:00:53 +00:00
; Check packet length parity:
; - Even packet length -> carry set -> add 6 bytes
; - Odd packet length -> carry clear -> add 5 bytes
lda len
eor #$01
lsr
; The packet contains 3 extra words
lda len
adc #$05 ; Actually 5 or 6 depending on carry
Remove received packet(s) to allow to send one. Behave just like the CS8900A driver: Both the CS8900A and the LAN91C96 dynamically share a buffer for received packets and packets to be send. If the chip is exposed to a network with a lot of broadcasts the shared buffer might fill quicker with received packets than the 6502 reads them (via polling). So we might need to drop some received packets in order to be able to send anything at all.
2015-04-13 19:09:15 +00:00
fixup33:sta ethdata
1. Replaced IP65 Ethernet drivers with Contiki drivers. * CS8900A The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and removes received frames from the chip if there's no room to send frames. * LAN91C96 The Contiki driver was used by IP65 more or less unchanged in the first place. * W5100 The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and stays clear from the W5100 hybrid mode. It presumes a fully functional W5100 register auto-increment and pre-calculates necessary W5100 frame buffer wrap-arounds and thus achieves the maximal 6502 <-> W5100 transfer speed.
2014-06-12 22:00:53 +00:00
lda len+1
adc #$00
Remove received packet(s) to allow to send one. Behave just like the CS8900A driver: Both the CS8900A and the LAN91C96 dynamically share a buffer for received packets and packets to be send. If the chip is exposed to a network with a lot of broadcasts the shared buffer might fill quicker with received packets than the 6502 reads them (via polling). So we might need to drop some received packets in order to be able to send anything at all.
2015-04-13 19:09:15 +00:00
fixup34:sta ethdata
1. Replaced IP65 Ethernet drivers with Contiki drivers. * CS8900A The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and removes received frames from the chip if there's no room to send frames. * LAN91C96 The Contiki driver was used by IP65 more or less unchanged in the first place. * W5100 The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and stays clear from the W5100 hybrid mode. It presumes a fully functional W5100 register auto-increment and pre-calculates necessary W5100 frame buffer wrap-arounds and thus achieves the maximal 6502 <-> W5100 transfer speed.
2014-06-12 22:00:53 +00:00
; Send the packet
; ---------------
; Write bytes from buffer
jsr adjustptr
: lda (ptr),y
Remove received packet(s) to allow to send one. Behave just like the CS8900A driver: Both the CS8900A and the LAN91C96 dynamically share a buffer for received packets and packets to be send. If the chip is exposed to a network with a lot of broadcasts the shared buffer might fill quicker with received packets than the 6502 reads them (via polling). So we might need to drop some received packets in order to be able to send anything at all.
2015-04-13 19:09:15 +00:00
fixup35:sta ethdata
1. Replaced IP65 Ethernet drivers with Contiki drivers. * CS8900A The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and removes received frames from the chip if there's no room to send frames. * LAN91C96 The Contiki driver was used by IP65 more or less unchanged in the first place. * W5100 The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and stays clear from the W5100 hybrid mode. It presumes a fully functional W5100 register auto-increment and pre-calculates necessary W5100 frame buffer wrap-arounds and thus achieves the maximal 6502 <-> W5100 transfer speed.
2014-06-12 22:00:53 +00:00
iny
bne :-
inc ptr+1
dex
bpl :-
; Odd packet length ?
lda len
lsr
bcc :+
; Yes
lda #%00100000 ; ODD
bne :++ ; Always
; No
: lda #$00
Remove received packet(s) to allow to send one. Behave just like the CS8900A driver: Both the CS8900A and the LAN91C96 dynamically share a buffer for received packets and packets to be send. If the chip is exposed to a network with a lot of broadcasts the shared buffer might fill quicker with received packets than the 6502 reads them (via polling). So we might need to drop some received packets in order to be able to send anything at all.
2015-04-13 19:09:15 +00:00
fixup36:sta ethdata ; Fill byte
1. Replaced IP65 Ethernet drivers with Contiki drivers. * CS8900A The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and removes received frames from the chip if there's no room to send frames. * LAN91C96 The Contiki driver was used by IP65 more or less unchanged in the first place. * W5100 The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and stays clear from the W5100 hybrid mode. It presumes a fully functional W5100 register auto-increment and pre-calculates necessary W5100 frame buffer wrap-arounds and thus achieves the maximal 6502 <-> W5100 transfer speed.
2014-06-12 22:00:53 +00:00
:
Remove received packet(s) to allow to send one. Behave just like the CS8900A driver: Both the CS8900A and the LAN91C96 dynamically share a buffer for received packets and packets to be send. If the chip is exposed to a network with a lot of broadcasts the shared buffer might fill quicker with received packets than the 6502 reads them (via polling). So we might need to drop some received packets in order to be able to send anything at all.
2015-04-13 19:09:15 +00:00
fixup37:sta ethdata ; Control byte
1. Replaced IP65 Ethernet drivers with Contiki drivers. * CS8900A The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and removes received frames from the chip if there's no room to send frames. * LAN91C96 The Contiki driver was used by IP65 more or less unchanged in the first place. * W5100 The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and stays clear from the W5100 hybrid mode. It presumes a fully functional W5100 register auto-increment and pre-calculates necessary W5100 frame buffer wrap-arounds and thus achieves the maximal 6502 <-> W5100 transfer speed.
2014-06-12 22:00:53 +00:00
; Add packet to FIFO
lda #%11000000 ; ENQUEUE PACKET - transmit packet
Remove received packet(s) to allow to send one. Behave just like the CS8900A driver: Both the CS8900A and the LAN91C96 dynamically share a buffer for received packets and packets to be send. If the chip is exposed to a network with a lot of broadcasts the shared buffer might fill quicker with received packets than the 6502 reads them (via polling). So we might need to drop some received packets in order to be able to send anything at all.
2015-04-13 19:09:15 +00:00
fixup38:sta ethmmucr
1. Replaced IP65 Ethernet drivers with Contiki drivers. * CS8900A The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and removes received frames from the chip if there's no room to send frames. * LAN91C96 The Contiki driver was used by IP65 more or less unchanged in the first place. * W5100 The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and stays clear from the W5100 hybrid mode. It presumes a fully functional W5100 register auto-increment and pre-calculates necessary W5100 frame buffer wrap-arounds and thus achieves the maximal 6502 <-> W5100 transfer speed.
2014-06-12 22:00:53 +00:00
clc
rts
;---------------------------------------------------------------------
exit:
rts
;---------------------------------------------------------------------
Remove received packet(s) to allow to send one. Behave just like the CS8900A driver: Both the CS8900A and the LAN91C96 dynamically share a buffer for received packets and packets to be send. If the chip is exposed to a network with a lot of broadcasts the shared buffer might fill quicker with received packets than the 6502 reads them (via polling). So we might need to drop some received packets in order to be able to send anything at all.
2015-04-13 19:09:15 +00:00
releasepacket:
; Remove and release RX packet from the FIFO
lda #%10000000
fixup39:sta ethmmucr
rts
;---------------------------------------------------------------------
1. Replaced IP65 Ethernet drivers with Contiki drivers. * CS8900A The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and removes received frames from the chip if there's no room to send frames. * LAN91C96 The Contiki driver was used by IP65 more or less unchanged in the first place. * W5100 The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and stays clear from the W5100 hybrid mode. It presumes a fully functional W5100 register auto-increment and pre-calculates necessary W5100 frame buffer wrap-arounds and thus achieves the maximal 6502 <-> W5100 transfer speed.
2014-06-12 22:00:53 +00:00
adjustptr:
lda len
ldx len+1
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
rts
;---------------------------------------------------------------------
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