mirror of
https://github.com/oliverschmidt/contiki.git
synced 2024-12-23 01:29:33 +00:00
237 lines
6.1 KiB
C
237 lines
6.1 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 uIP TCP/IP stack.
|
|
*
|
|
* $Id: rs232dev-ss.c,v 1.1 2007/05/23 23:11:30 oliverschmidt 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 "rs232silversurfer.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 "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(rs232_get(&c) == RS_ERR_NO_DATA)
|
|
#define SIO_POLL(c) (rs232_get(&c) != RS_ERR_NO_DATA)
|
|
#define SIO_SEND(c) while(rs232_put(c) == RS_ERR_OVERFLOW)
|
|
|
|
#define MAX_SIZE (UIP_BUFSIZE - UIP_LLH_LEN)
|
|
|
|
static u8_t slip_buf[MAX_SIZE + 2];
|
|
|
|
static u16_t len, tmplen;
|
|
|
|
#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;
|
|
|
|
while(SIO_POLL(c)) {
|
|
/* printf("c %x\n", 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;
|
|
|
|
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;
|
|
}
|
|
/*-----------------------------------------------------------------------------------*/
|
|
|