314 lines
7.2 KiB
C
314 lines
7.2 KiB
C
/* UNFINISHED CODE: the code works, but has yet to be converted into
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proper C code. It is mostly 6502 assembler for now. */
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/*
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* Copyright (c) 2001, Adam Dunkels.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* This file is part of the C64 RealAudio server demo project.
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*
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* $Id: cs8900a.c,v 1.1 2006/06/17 22:41:16 adamdunkels Exp $
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*
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*/
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/* cs8900a.c: device driver for the CS8900a chip in 8-bit mode. Mostly
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written in 6502 assembler for speed. */
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#include "cs8900a.h"
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#include "uip.h"
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#include "uip_arp.h"
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#define UIP_ETHADDR0 0x00
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#define UIP_ETHADDR1 0x00
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#define UIP_ETHADDR2 0x00
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#define UIP_ETHADDR3 0x64
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#define UIP_ETHADDR4 0x64
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#define UIP_ETHADDR5 0x64
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extern u8_t *cs8900a_rxtxreg,
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*cs8900a_txcmd,
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*cs8900a_txlen,
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*cs8900a_packetpp,
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*cs8900a_ppdata;
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static u16_t len;
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static u8_t r;
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#define WRITE(P, D) do { PACKETPP = (P); \
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PPDATA = (D); } while(0)
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/*-----------------------------------------------------------------------------------*/
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void
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cs8900a_init(void)
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{
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/* Turn on transmission and reception of frames. */
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WRITE(0x0112, 0x00c0);
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/* Accept valid unicast+broadcast frames. */
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WRITE(0x0104, 0x0d05);
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/* Set MAC address. */
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WRITE(0x0158, (ETHADDR1 << 8) | (ETHADDR0));
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WRITE(0x015a, (ETHADDR3 << 8) | (ETHADDR2));
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WRITE(0x015c, (ETHADDR5 << 8) | (ETHADDR4));
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}
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/*-----------------------------------------------------------------------------------*/
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void
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cs8900a_send(void)
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{
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if(uip_len > UIP_BUFSIZE) {
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return;
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}
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/* Transmit command. */
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/* *cs8900a_txcmd = 0x00c0 */
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asm("lda #$c0");
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asm("sta %v", cs8900a_txcmd);
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asm("lda #$00");
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asm("sta %v+1", cs8900a_txcmd);
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/* *cs8900a_txlen = uip_len */
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asm("lda _uip_len");
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asm("sta %v", cs8900a_txlen);
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#if UIP_BUFSIZE > 255
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asm("lda _uip_len+1");
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#else
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asm("lda #0");
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#endif
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asm("sta %v+1", cs8900a_txlen);
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asm("ldx #8");
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asm("tryagain:");
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/* Check for avaliable buffer space. */
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asm("lda #$38");
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asm("sta %v", cs8900a_packetpp);
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asm("lda #$01");
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asm("sta %v+1", cs8900a_packetpp);
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asm("lda %v+1", cs8900a_ppdata);
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asm("and #1");
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asm("bne send");
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/* No space avaliable, skip a received frame and try again. */
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asm("lda #$02");
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asm("sta %v", cs8900a_packetpp);
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asm("lda #$01");
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asm("sta %v+1", cs8900a_packetpp);
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asm("lda %v", cs8900a_ppdata);
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asm("ora #$40");
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asm("sta %v", cs8900a_ppdata);
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asm("dex");
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asm("bne tryagain");
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asm("bailout:");
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return;
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/* Send the frame. */
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asm("send:");
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/* First, send 40+14=54 bytes of header. */
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asm("ldx #54");
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asm("ldy #0");
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asm("sendloop1:");
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asm("lda _uip_buf,y");
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asm("sta %v", cs8900a_rxtxreg);
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asm("lda _uip_buf+1,y");
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asm("sta %v+1", cs8900a_rxtxreg);
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asm("iny");
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asm("iny");
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asm("dex");
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asm("dex");
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asm("bne sendloop1");
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if(uip_len <= 54) {
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return;
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}
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/* Next, send rest of the packet. */
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uip_len -= 54;
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asm("lda ptr1");
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asm("pha");
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asm("lda ptr1+1");
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asm("pha");
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asm("lda _uip_appdata");
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asm("sta ptr1");
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asm("lda _uip_appdata+1");
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asm("sta ptr1+1");
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asm("sendloop2:");
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asm("lda _uip_len");
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asm("tax");
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asm("and #1");
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asm("beq noinc");
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asm("inx");
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asm("noinc:");
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#if UIP_BUFSIZE > 255
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asm("lda _uip_len+1");
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#else
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asm("lda #0");
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#endif
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asm("beq nozero");
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asm("ldx #0");
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asm("nozero:");
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asm("ldy #0");
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asm("sendloop:");
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asm("lda (ptr1),y");
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asm("sta %v", cs8900a_rxtxreg);
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asm("iny");
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asm("lda (ptr1),y");
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asm("sta %v+1", cs8900a_rxtxreg);
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asm("iny");
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asm("dex");
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asm("dex");
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asm("bne sendloop");
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asm("inc ptr1+1");
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#if UIP_BUFSIZE > 255
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asm("dec _uip_len+1");
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asm("bpl sendloop2");
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#endif
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asm("pla");
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asm("sta ptr1+1");
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asm("pla");
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asm("sta ptr1");
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}
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/*-----------------------------------------------------------------------------------*/
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static void
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skip_frame(void)
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{
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WRITE(0x0102, PPDATA | 0x0040);
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}
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/*-----------------------------------------------------------------------------------*/
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u8_t
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cs8900a_poll(void)
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{
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/* Check receiver event register to see if there are any valid
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unicast frames avaliable. */
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/* PACKETPP = 0x0124;
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if(PPDATA & 0x000d == 0x0000) {
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return 0;
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}
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*/
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asm("lda #$24");
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asm("sta %v", cs8900a_packetpp);
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asm("lda #$01");
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asm("sta %v+1", cs8900a_packetpp);
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asm("lda %v+1", cs8900a_ppdata);
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asm("and #$0d");
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asm("cmp #$00");
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asm("bne noreturn");
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/* No frame ready. */
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return 0;
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asm("noreturn:");
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/* Process the incoming frame. */
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/* Read receiver event and discard it. */
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/* dummy = RXTXREG; */
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asm("lda %v+1", cs8900a_rxtxreg);
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asm("sta _len+1");
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asm("lda %v", cs8900a_rxtxreg);
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asm("sta _len");
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/* Read frame length. */
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/* len = uip_len = RXTXREG; */
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asm("lda %v+1", cs8900a_rxtxreg);
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asm("sta _len+1");
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asm("sta _uip_len+1");
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asm("lda %v", cs8900a_rxtxreg);
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asm("sta _len");
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asm("sta _uip_len");
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if(len > UIP_BUFSIZE) {
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skip_frame();
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return 0;
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}
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/* Read bytes into uip_buf. */
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asm("lda ptr1");
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asm("pha");
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asm("lda ptr1+1");
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asm("pha");
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asm("lda #<_uip_buf");
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asm("sta ptr1");
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asm("lda #>_uip_buf");
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asm("sta ptr1+1");
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asm("lda _len+1");
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asm("beq read256");
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/* Read first 256*n bytes. */
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asm("ldy #0");
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asm("read256loop:");
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asm("lda %v", cs8900a_rxtxreg);
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asm("sta (ptr1),y");
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asm("iny");
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asm("lda %v+1", cs8900a_rxtxreg);
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asm("sta (ptr1),y");
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asm("iny");
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asm("bne read256loop");
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asm("inc ptr1+1");
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asm("dec _len+1");
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asm("bne read256loop");
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/* Read last 255 or less bytes. */
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asm("read256:");
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asm("lda _len");
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asm("lsr");
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asm("bcc noinc");
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asm("inc _len");
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asm("noinc:");
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asm("ldy #$0");
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asm("readloop:");
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asm("lda %v", cs8900a_rxtxreg);
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asm("sta (ptr1),y");
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asm("iny");
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asm("lda %v+1", cs8900a_rxtxreg);
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asm("sta (ptr1),y");
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asm("iny");
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asm("cpy _len");
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asm("bne readloop");
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asm("pla");
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asm("sta ptr1+1");
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asm("pla");
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asm("sta ptr1");
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return len;
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}
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