contiki/cpu/6502/net/rs232dev.c

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/*
* 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 uIP TCP/IP stack.
*
* $Id: rs232dev.c,v 1.1 2006/06/17 22:41:21 adamdunkels Exp $
*
*/
/*
* This is a generic implementation of the SLIP protocol over an RS232
* (serial) device. While initially intented for the C64, the code can
* easily be ported to other platforms as well.
*
* Huge thanks to Ullrich von Bassewitz <uz@cc65.org> of cc65 fame for
* and endless supply of bugfixes, insightsful comments and
* suggestions, and improvements to this code!
*/
#include <serial.h>
#include <time.h>
#include <string.h>
/* This will include the system specific header files as well */
#if defined(__CBM__)
# include <cbm.h>
#elif defined(__ATARI__)
# include <atari.h>
#endif
#include "net/uip.h"
#define SLIP_END 0300
#define SLIP_ESC 0333
#define SLIP_ESC_END 0334
#define SLIP_ESC_ESC 0335
#define SIO_RECV(c) while(ser_get(&c) == SER_ERR_NO_DATA)
#define SIO_POLL(c) (ser_get(&c) != SER_ERR_NO_DATA)
#define SIO_SEND(c) ser_put(c)
#define MAX_SIZE (UIP_BUFSIZE - UIP_LLH_LEN)
static u8_t slip_buf[MAX_SIZE + 2];
static u16_t len, tmplen;
static char loaded = 0;
#if 1
#define printf(x)
#else
#include <stdio.h>
#endif
/*-----------------------------------------------------------------------------------*/
/*static void
rs232_err(char err)
{
switch(err) {
case RS_ERR_OK:
printf("RS232 OK\n");
break;
case RS_ERR_NOT_INITIALIZED:
printf("RS232 not initialized\n");
break;
case RS_ERR_BAUD_TOO_FAST:
printf("RS232 baud too fast\n");
break;
case RS_ERR_BAUD_NOT_AVAIL:
printf("RS232 baud rate not available\n");
break;
case RS_ERR_NO_DATA:
printf("RS232 nothing to read\n");
break;
case RS_ERR_OVERFLOW:
printf("RS232 overflow\n");
break;
}
}*/
/*-----------------------------------------------------------------------------------*/
/*
* rs232dev_send():
*
* Sends the packet in the uip_buf and uip_appdata buffers. The first
* 40 bytes of the packet (the IP and TCP headers) are read from the
* uip_buf buffer, and the following bytes (the application data) are
* read from the uip_appdata buffer.
*
*/
/*-----------------------------------------------------------------------------------*/
void
rs232dev_send(void)
{
u16_t i;
u8_t *ptr;
u8_t c;
SIO_SEND(SLIP_END);
ptr = &uip_buf[UIP_LLH_LEN];
for(i = 0; i < uip_len; ++i) {
if(i == UIP_TCPIP_HLEN) {
ptr = uip_appdata;
}
c = *ptr++;
switch(c) {
case SLIP_END:
SIO_SEND(SLIP_ESC);
SIO_SEND(SLIP_ESC_END);
break;
case SLIP_ESC:
SIO_SEND(SLIP_ESC);
SIO_SEND(SLIP_ESC_ESC);
break;
default:
SIO_SEND(c);
break;
}
}
SIO_SEND(SLIP_END);
}
/*-----------------------------------------------------------------------------------*/
/*
* rs232dev_poll():
*
* Read all avaliable bytes from the RS232 interface into the slip_buf
* buffer. If no more bytes are avaliable, it returns with 0 to
* indicate that no packet was immediately ready. When a full packet
* has been read into the buffer, the packet is copied into the
* uip_buf buffer and the length of the packet is returned.
*
*/
/*-----------------------------------------------------------------------------------*/
u16_t
rs232dev_poll(void)
{
u8_t c;
static u8_t lastc;
if(loaded == 0) {
return 0;
}
while(SIO_POLL(c)) {
switch(c) {
case SLIP_ESC:
lastc = c;
break;
case SLIP_END:
lastc = c;
/* End marker found, we copy our input buffer to the uip_buf
buffer and return the size of the packet we copied. */
memcpy(&uip_buf[UIP_LLH_LEN], slip_buf, len);
tmplen = len;
len = 0;
return tmplen;
default:
if(lastc == SLIP_ESC) {
lastc = c;
/* Previous read byte was an escape byte, so this byte will be
interpreted differently from others. */
switch(c) {
case SLIP_ESC_END:
c = SLIP_END;
break;
case SLIP_ESC_ESC:
c = SLIP_ESC;
break;
}
} else {
lastc = c;
}
slip_buf[len] = c;
++len;
if(len > MAX_SIZE) {
len = 0;
}
break;
}
}
return 0;
}
/*-----------------------------------------------------------------------------------*/
/*
* rs232dev_init():
*
* Initializes the RS232 device and sets the parameters of the device.
*
*/
/*-----------------------------------------------------------------------------------*/
void
rs232dev_init(void)
{
char err;
struct ser_params p;
err = ser_load_driver("c64-swlink.ser");
if(err != SER_ERR_OK) {
asm("inc $d020");
return;
}
p.baudrate = SER_BAUD_9600;
p.databits = SER_BITS_8;
p.stopbits = SER_STOP_1;
p.parity = SER_PAR_NONE;
p.handshake = SER_HS_HW;
err = ser_open(&p);
if(err != SER_ERR_OK) {
asm("inc $d020");
return;
}
loaded = 1;
/* err = rs232_init(0); */
/* rs232_err(err);*/
/* err = rs232_params(RS_BAUD_9600 | RS_BITS_8 | RS_STOP_1, RS_PAR_NONE);*/
/* rs232_err(err);*/
len = 0;
return;
}
/*-----------------------------------------------------------------------------------*/
void
rs232dev_unload(void)
{
if(loaded){
ser_unload();
}
}
/*-----------------------------------------------------------------------------------*/