emailler/drivers/ethernet.s

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; Wrapper for Contiki ethernet driver
.include "../inc/common.inc"
.export eth_init
.export eth_rx
.export eth_tx
.import eth_inp
.import eth_inp_len
.import eth_outp
.import eth_outp_len
.import eth
.import cfg_mac
.struct driver
drvtype .byte 3
apiver .byte
mac .byte 6
bufaddr .addr
bufsize .word
init .byte 3
poll .byte 3
send .byte 3
exit .byte 3
.endstruct
.code
; initialize the ethernet adaptor
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
; inputs: A = adaptor specific initialisation value or 'eth_init_default'
; outputs: carry flag is set if there was an error, clear otherwise
eth_init:
jsr eth+driver::init
ldx #5
: lda eth+driver::mac,x
sta cfg_mac,x
dex
bpl :-
ldax #1518
stax eth+driver::bufsize
rts
; receive a packet
; inputs: none
; outputs:
; if there was an error receiving the packet (or no packet was ready) then carry flag is set
; if packet was received correctly then carry flag is clear,
; eth_inp contains the received packet,
; and eth_inp_len contains the length of the packet
eth_rx:
ldax #eth_inp
stax eth+driver::bufaddr
jsr eth+driver::poll
stax eth_inp_len
rts
; send a packet
; inputs:
; eth_outp: packet to send
; eth_outp_len: length of packet to send
; outputs:
; if there was an error sending the packet then carry flag is set
; otherwise carry flag is cleared
eth_tx:
ldax #eth_outp
stax eth+driver::bufaddr
ldax eth_outp_len
jmp eth+driver::send
; -- LICENSE FOR ethernet.s --
; The contents of this file are subject to the Mozilla Public License
; Version 1.1 (the "License"); you may not use this file except in
; compliance with the License. You may obtain a copy of the License at
; http://www.mozilla.org/MPL/
;
; Software distributed under the License is distributed on an "AS IS"
; basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
; License for the specific language governing rights and limitations
; under the License.
;
; The Original Code is ip65.
;
; The Initial Developer of the Original Code is Jonno Downes,
; jonno@jamtronix.com.
; Portions created by the Initial Developer are Copyright (C) 2009
; Jonno Downes. All Rights Reserved.
; -- LICENSE END --