298 lines
7.7 KiB
C
298 lines
7.7 KiB
C
/*
|
|
* Copyright (c) 2001, Adam Dunkels.
|
|
* 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. The name of the author may not be used to endorse or promote
|
|
* products derived from this software without specific prior
|
|
* written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 C64 RealAudio server demo project.
|
|
*
|
|
* $Id: cs8900a.c,v 1.1 2007/05/23 22:37:00 oliverschmidt Exp $
|
|
*
|
|
*/
|
|
|
|
/* cs8900a.c: device driver for the CS8900a chip in 8-bit mode. Mostly
|
|
written in 6502 assembler for speed. */
|
|
|
|
#include "cs8900a.h"
|
|
#include "contiki-net.h"
|
|
|
|
extern u8_t *cs8900a_rxtxreg,
|
|
*cs8900a_txcmd,
|
|
*cs8900a_txlen,
|
|
*cs8900a_packetpp,
|
|
*cs8900a_ppdata;
|
|
|
|
static u16_t len;
|
|
static u16_t cnt;
|
|
|
|
|
|
/*-----------------------------------------------------------------------------------*/
|
|
#pragma optimize(push, off)
|
|
void
|
|
cs8900a_init(void)
|
|
{
|
|
/* Turn on transmission and reception of frames. */
|
|
/* PACKETPP = 0x0112;
|
|
PPDATA = 0x00c0; */
|
|
asm("lda #$12");
|
|
asm("sta %v", cs8900a_packetpp);
|
|
asm("lda #$01");
|
|
asm("sta %v+1", cs8900a_packetpp);
|
|
asm("lda #$c0");
|
|
asm("sta %v", cs8900a_ppdata);
|
|
asm("lda #$00");
|
|
asm("sta %v+1", cs8900a_ppdata);
|
|
|
|
/* Accept valid unicast+broadcast frames. */
|
|
/* PACKETPP = 0x0104;
|
|
PPDATA = 0x0d05; */
|
|
asm("lda #$04");
|
|
asm("sta %v", cs8900a_packetpp);
|
|
asm("lda #$01");
|
|
asm("sta %v+1", cs8900a_packetpp);
|
|
asm("lda #$05");
|
|
asm("sta %v", cs8900a_ppdata);
|
|
asm("lda #$0d");
|
|
asm("sta %v+1", cs8900a_ppdata);
|
|
|
|
/* Set MAC address. */
|
|
/* PACKETPP = 0x0158;
|
|
PPDATA = (ETHADDR1 << 8) | (ETHADDR0); */
|
|
asm("lda #$58");
|
|
asm("sta %v", cs8900a_packetpp);
|
|
asm("lda #$01");
|
|
asm("sta %v+1", cs8900a_packetpp);
|
|
asm("lda %v", uip_ethaddr);
|
|
asm("sta %v", cs8900a_ppdata);
|
|
asm("lda %v+1", uip_ethaddr);
|
|
asm("sta %v+1", cs8900a_ppdata);
|
|
|
|
/* PACKETPP = 0x015a;
|
|
PPDATA = (ETHADDR3 << 8) | (ETHADDR2); */
|
|
asm("lda #$5a");
|
|
asm("sta %v", cs8900a_packetpp);
|
|
asm("lda #$01");
|
|
asm("sta %v+1", cs8900a_packetpp);
|
|
asm("lda %v+2", uip_ethaddr);
|
|
asm("sta %v", cs8900a_ppdata);
|
|
asm("lda %v+3", uip_ethaddr);
|
|
asm("sta %v+1", cs8900a_ppdata);
|
|
|
|
/* PACKETPP = 0x015c;
|
|
PPDATA = (ETHADDR5 << 8) | (ETHADDR4); */
|
|
asm("lda #$5c");
|
|
asm("sta %v", cs8900a_packetpp);
|
|
asm("lda #$01");
|
|
asm("sta %v+1", cs8900a_packetpp);
|
|
asm("lda %v+4", uip_ethaddr);
|
|
asm("sta %v", cs8900a_ppdata);
|
|
asm("lda %v+5", uip_ethaddr);
|
|
asm("sta %v+1", cs8900a_ppdata);
|
|
}
|
|
#pragma optimize(pop)
|
|
/*-----------------------------------------------------------------------------------*/
|
|
#pragma optimize(push, off)
|
|
void
|
|
cs8900a_send(void)
|
|
{
|
|
/* Transmit command. */
|
|
asm("lda #$c0");
|
|
asm("sta %v", cs8900a_txcmd);
|
|
asm("lda #$00");
|
|
asm("sta %v+1", cs8900a_txcmd);
|
|
asm("lda %v", uip_len);
|
|
asm("sta %v", cs8900a_txlen);
|
|
asm("lda %v+1", uip_len);
|
|
asm("sta %v+1", cs8900a_txlen);
|
|
|
|
asm("ldy #8");
|
|
tryagain:
|
|
/* Check for avaliable buffer space. */
|
|
asm("lda #$38");
|
|
asm("sta %v", cs8900a_packetpp);
|
|
asm("lda #$01");
|
|
asm("sta %v+1", cs8900a_packetpp);
|
|
asm("lda %v+1", cs8900a_ppdata);
|
|
asm("and #1");
|
|
asm("bne %g", send);
|
|
|
|
/* No space avaliable, skip a received frame and try again. */
|
|
asm("lda #$02");
|
|
asm("sta %v", cs8900a_packetpp);
|
|
asm("lda #$01");
|
|
asm("sta %v+1", cs8900a_packetpp);
|
|
asm("lda %v", cs8900a_ppdata);
|
|
asm("ora #$40");
|
|
asm("sta %v", cs8900a_ppdata);
|
|
|
|
asm("dey");
|
|
asm("bne %g", tryagain);
|
|
return;
|
|
|
|
/* Send the frame. */
|
|
send:
|
|
|
|
/* First, send 14+40=54 bytes of header. */
|
|
asm("ldy #0");
|
|
sendloop1:
|
|
asm("lda %v,y", uip_buf);
|
|
asm("sta %v", cs8900a_rxtxreg);
|
|
asm("iny");
|
|
asm("lda %v,y", uip_buf);
|
|
asm("sta %v+1", cs8900a_rxtxreg);
|
|
asm("iny");
|
|
asm("cpy #%b", UIP_LLH_LEN + UIP_TCPIP_HLEN);
|
|
asm("bne %g", sendloop1);
|
|
|
|
if(uip_len <= UIP_LLH_LEN + UIP_TCPIP_HLEN) {
|
|
return;
|
|
}
|
|
|
|
/* Next, send rest of the packet. */
|
|
cnt = uip_len - (UIP_LLH_LEN + UIP_TCPIP_HLEN);
|
|
|
|
asm("lda %v", cnt);
|
|
asm("lsr");
|
|
asm("bcc %g", noinc);
|
|
asm("inc %v", cnt);
|
|
asm("bne %g", noinc);
|
|
asm("inc %v+1", cnt);
|
|
noinc:
|
|
|
|
asm("lda %v", uip_appdata);
|
|
asm("sta ptr1");
|
|
asm("lda %v+1", uip_appdata);
|
|
asm("sta ptr1+1");
|
|
|
|
asm("ldy #0");
|
|
sendloop2:
|
|
asm("lda (ptr1),y");
|
|
asm("sta %v", cs8900a_rxtxreg);
|
|
asm("iny");
|
|
asm("lda (ptr1),y");
|
|
asm("sta %v+1", cs8900a_rxtxreg);
|
|
asm("iny");
|
|
asm("bne %g", check);
|
|
asm("inc ptr1+1");
|
|
check:
|
|
asm("cpy %v", cnt);
|
|
asm("bne %g", sendloop2);
|
|
asm("dec %v+1", cnt);
|
|
asm("bpl %g", sendloop2);
|
|
}
|
|
#pragma optimize(pop)
|
|
/*-----------------------------------------------------------------------------------*/
|
|
#pragma optimize(push, off)
|
|
static void
|
|
skip_frame(void)
|
|
{
|
|
/* PACKETPP = 0x0102;
|
|
PPDATA = PPDATA | 0x0040; */
|
|
asm("lda #$02");
|
|
asm("sta %v", cs8900a_packetpp);
|
|
asm("lda #$01");
|
|
asm("sta %v+1", cs8900a_packetpp);
|
|
asm("lda %v", cs8900a_ppdata);
|
|
asm("ora #$40");
|
|
asm("sta %v", cs8900a_ppdata);
|
|
}
|
|
#pragma optimize(pop)
|
|
/*-----------------------------------------------------------------------------------*/
|
|
#pragma optimize(push, off)
|
|
u16_t
|
|
cs8900a_poll(void)
|
|
{
|
|
/* Check receiver event register to see if there are any valid
|
|
unicast frames avaliable. */
|
|
/* PACKETPP = 0x0124;
|
|
if(PPDATA & 0x000d == 0x0000) {
|
|
return 0;
|
|
}
|
|
*/
|
|
asm("lda #$24");
|
|
asm("sta %v", cs8900a_packetpp);
|
|
asm("lda #$01");
|
|
asm("sta %v+1", cs8900a_packetpp);
|
|
asm("lda %v+1", cs8900a_ppdata);
|
|
asm("and #$0d");
|
|
asm("cmp #$00");
|
|
asm("bne %g", noreturn);
|
|
/* No frame ready. */
|
|
return 0;
|
|
|
|
noreturn:
|
|
/* Process the incoming frame. */
|
|
|
|
/* Read receiver event and discard it. */
|
|
/* RXTXREG; */
|
|
asm("lda %v+1", cs8900a_rxtxreg);
|
|
asm("lda %v", cs8900a_rxtxreg);
|
|
|
|
/* Read frame length. */
|
|
/* cnt = len = RXTXREG; */
|
|
asm("lda %v+1", cs8900a_rxtxreg);
|
|
asm("sta %v+1", len);
|
|
asm("sta %v+1", cnt);
|
|
asm("lda %v", cs8900a_rxtxreg);
|
|
asm("sta %v", len);
|
|
asm("sta %v", cnt);
|
|
|
|
asm("lsr");
|
|
asm("bcc %g", noinc);
|
|
asm("inc %v", cnt);
|
|
asm("bne %g", noinc);
|
|
asm("inc %v+1", cnt);
|
|
noinc:
|
|
|
|
if(cnt > UIP_BUFSIZE) {
|
|
skip_frame();
|
|
return 0;
|
|
}
|
|
|
|
/* Read bytes into uip_buf. */
|
|
asm("lda #<%v", uip_buf);
|
|
asm("sta ptr1");
|
|
asm("lda #>%v", uip_buf);
|
|
asm("sta ptr1+1");
|
|
|
|
asm("ldy #0");
|
|
readloop:
|
|
asm("lda %v", cs8900a_rxtxreg);
|
|
asm("sta (ptr1),y");
|
|
asm("iny");
|
|
asm("lda %v+1", cs8900a_rxtxreg);
|
|
asm("sta (ptr1),y");
|
|
asm("iny");
|
|
asm("bne %g", check);
|
|
asm("inc ptr1+1");
|
|
check:
|
|
asm("cpy %v", cnt);
|
|
asm("bne %g", readloop);
|
|
asm("dec %v+1", cnt);
|
|
asm("bpl %g", readloop);
|
|
return len;
|
|
}
|
|
#pragma optimize(pop)
|