298 lines
7.7 KiB
C
298 lines
7.7 KiB
C
/*
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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 2007/05/23 23:11:29 oliverschmidt 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 "contiki-net.h"
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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 u16_t cnt;
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/*-----------------------------------------------------------------------------------*/
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#pragma optimize(push, off)
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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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/* PACKETPP = 0x0112;
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PPDATA = 0x00c0; */
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asm("lda #$12");
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asm("sta %v", cs8900a_packetpp);
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asm("lda #$01");
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asm("sta %v+1", cs8900a_packetpp);
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asm("lda #$c0");
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asm("sta %v", cs8900a_ppdata);
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asm("lda #$00");
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asm("sta %v+1", cs8900a_ppdata);
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/* Accept valid unicast+broadcast frames. */
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/* PACKETPP = 0x0104;
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PPDATA = 0x0d05; */
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asm("lda #$04");
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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 #$05");
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asm("sta %v", cs8900a_ppdata);
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asm("lda #$0d");
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asm("sta %v+1", cs8900a_ppdata);
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/* Set MAC address. */
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/* PACKETPP = 0x0158;
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PPDATA = (ETHADDR1 << 8) | (ETHADDR0); */
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asm("lda #$58");
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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", uip_ethaddr);
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asm("sta %v", cs8900a_ppdata);
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asm("lda %v+1", uip_ethaddr);
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asm("sta %v+1", cs8900a_ppdata);
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/* PACKETPP = 0x015a;
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PPDATA = (ETHADDR3 << 8) | (ETHADDR2); */
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asm("lda #$5a");
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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+2", uip_ethaddr);
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asm("sta %v", cs8900a_ppdata);
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asm("lda %v+3", uip_ethaddr);
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asm("sta %v+1", cs8900a_ppdata);
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/* PACKETPP = 0x015c;
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PPDATA = (ETHADDR5 << 8) | (ETHADDR4); */
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asm("lda #$5c");
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asm("sta %v", cs8900a_packetpp);
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asm("lda #$01");
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asm("sta %v+1", cs8900a_packetpp);
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asm("lda %v+4", uip_ethaddr);
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asm("sta %v", cs8900a_ppdata);
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asm("lda %v+5", uip_ethaddr);
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asm("sta %v+1", cs8900a_ppdata);
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}
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#pragma optimize(pop)
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/*-----------------------------------------------------------------------------------*/
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#pragma optimize(push, off)
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void
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cs8900a_send(void)
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{
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/* Transmit command. */
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asm("lda #$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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asm("lda %v", uip_len);
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asm("sta %v", cs8900a_txlen);
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asm("lda %v+1", uip_len);
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asm("sta %v+1", cs8900a_txlen);
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asm("ldy #8");
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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 %g", 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("dey");
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asm("bne %g", tryagain);
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return;
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/* Send the frame. */
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send:
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/* First, send 14+40=54 bytes of header. */
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asm("ldy #0");
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sendloop1:
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asm("lda %v,y", uip_buf);
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asm("sta %v", cs8900a_rxtxreg);
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asm("iny");
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asm("lda %v,y", uip_buf);
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asm("sta %v+1", cs8900a_rxtxreg);
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asm("iny");
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asm("cpy #%b", UIP_LLH_LEN + UIP_TCPIP_HLEN);
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asm("bne %g", sendloop1);
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if(uip_len <= UIP_LLH_LEN + UIP_TCPIP_HLEN) {
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return;
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}
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/* Next, send rest of the packet. */
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cnt = uip_len - (UIP_LLH_LEN + UIP_TCPIP_HLEN);
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asm("lda %v", cnt);
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asm("lsr");
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asm("bcc %g", noinc);
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asm("inc %v", cnt);
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asm("bne %g", noinc);
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asm("inc %v+1", cnt);
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noinc:
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asm("lda %v", uip_appdata);
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asm("sta ptr1");
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asm("lda %v+1", uip_appdata);
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asm("sta ptr1+1");
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asm("ldy #0");
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sendloop2:
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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("bne %g", check);
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asm("inc ptr1+1");
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check:
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asm("cpy %v", cnt);
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asm("bne %g", sendloop2);
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asm("dec %v+1", cnt);
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asm("bpl %g", sendloop2);
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}
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#pragma optimize(pop)
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/*-----------------------------------------------------------------------------------*/
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#pragma optimize(push, off)
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static void
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skip_frame(void)
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{
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/* PACKETPP = 0x0102;
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PPDATA = PPDATA | 0x0040; */
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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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}
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#pragma optimize(pop)
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/*-----------------------------------------------------------------------------------*/
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#pragma optimize(push, off)
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u16_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 %g", noreturn);
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/* No frame ready. */
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return 0;
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noreturn:
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/* Process the incoming frame. */
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/* Read receiver event and discard it. */
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/* RXTXREG; */
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asm("lda %v+1", cs8900a_rxtxreg);
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asm("lda %v", cs8900a_rxtxreg);
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/* Read frame length. */
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/* cnt = len = RXTXREG; */
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asm("lda %v+1", cs8900a_rxtxreg);
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asm("sta %v+1", len);
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asm("sta %v+1", cnt);
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asm("lda %v", cs8900a_rxtxreg);
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asm("sta %v", len);
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asm("sta %v", cnt);
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asm("lsr");
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asm("bcc %g", noinc);
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asm("inc %v", cnt);
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asm("bne %g", noinc);
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asm("inc %v+1", cnt);
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noinc:
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if(cnt > 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 #<%v", uip_buf);
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asm("sta ptr1");
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asm("lda #>%v", uip_buf);
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asm("sta ptr1+1");
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asm("ldy #0");
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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("bne %g", check);
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asm("inc ptr1+1");
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check:
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asm("cpy %v", cnt);
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asm("bne %g", readloop);
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asm("dec %v+1", cnt);
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asm("bpl %g", readloop);
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return len;
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}
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#pragma optimize(pop)
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