237 lines
6.1 KiB
C
237 lines
6.1 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 uIP TCP/IP stack.
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*
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* $Id: rs232dev-ss.c,v 1.1 2006/06/17 22:41:26 adamdunkels Exp $
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*
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*/
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/*
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* This is a generic implementation of the SLIP protocol over an RS232
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* (serial) device. While initially intented for the C64, the code can
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* easily be ported to other platforms as well.
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*
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* Huge thanks to Ullrich von Bassewitz <uz@cc65.org> of cc65 fame for
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* and endless supply of bugfixes, insightsful comments and
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* suggestions, and improvements to this code!
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*/
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#include "rs232silversurfer.h"
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#include <time.h>
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#include <string.h>
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/* This will include the system specific header files as well */
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#if defined(__CBM__)
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# include <cbm.h>
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#elif defined(__ATARI__)
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# include <atari.h>
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#endif
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#include "uip.h"
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#define SLIP_END 0300
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#define SLIP_ESC 0333
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#define SLIP_ESC_END 0334
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#define SLIP_ESC_ESC 0335
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#define SIO_RECV(c) while(rs232_get(&c) == RS_ERR_NO_DATA)
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#define SIO_POLL(c) (rs232_get(&c) != RS_ERR_NO_DATA)
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#define SIO_SEND(c) while(rs232_put(c) == RS_ERR_OVERFLOW)
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#define MAX_SIZE (UIP_BUFSIZE - UIP_LLH_LEN)
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static u8_t slip_buf[MAX_SIZE + 2];
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static u16_t len, tmplen;
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#if 1
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#define printf(x)
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#else
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#include <stdio.h>
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#endif
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/*-----------------------------------------------------------------------------------*/
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static void
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rs232_err(char err)
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{
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switch(err) {
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case RS_ERR_OK:
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printf("RS232 OK\n");
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break;
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case RS_ERR_NOT_INITIALIZED:
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printf("RS232 not initialized\n");
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break;
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case RS_ERR_BAUD_TOO_FAST:
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printf("RS232 baud too fast\n");
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break;
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case RS_ERR_BAUD_NOT_AVAIL:
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printf("RS232 baud rate not available\n");
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break;
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case RS_ERR_NO_DATA:
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printf("RS232 nothing to read\n");
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break;
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case RS_ERR_OVERFLOW:
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printf("RS232 overflow\n");
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break;
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}
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}
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/*-----------------------------------------------------------------------------------*/
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/*
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* rs232dev_send():
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*
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* Sends the packet in the uip_buf and uip_appdata buffers. The first
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* 40 bytes of the packet (the IP and TCP headers) are read from the
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* uip_buf buffer, and the following bytes (the application data) are
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* read from the uip_appdata buffer.
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*
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*/
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/*-----------------------------------------------------------------------------------*/
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void
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rs232dev_send(void)
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{
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u16_t i;
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u8_t *ptr;
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u8_t c;
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SIO_SEND(SLIP_END);
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ptr = &uip_buf[UIP_LLH_LEN];
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for(i = 0; i < uip_len; ++i) {
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if(i == UIP_TCPIP_HLEN) {
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ptr = uip_appdata;
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}
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c = *ptr++;
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switch(c) {
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case SLIP_END:
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SIO_SEND(SLIP_ESC);
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SIO_SEND(SLIP_ESC_END);
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break;
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case SLIP_ESC:
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SIO_SEND(SLIP_ESC);
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SIO_SEND(SLIP_ESC_ESC);
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break;
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default:
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SIO_SEND(c);
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break;
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}
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}
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SIO_SEND(SLIP_END);
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}
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/*-----------------------------------------------------------------------------------*/
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/*
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* rs232dev_poll():
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*
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* Read all avaliable bytes from the RS232 interface into the slip_buf
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* buffer. If no more bytes are avaliable, it returns with 0 to
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* indicate that no packet was immediately ready. When a full packet
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* has been read into the buffer, the packet is copied into the
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* uip_buf buffer and the length of the packet is returned.
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*
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*/
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/*-----------------------------------------------------------------------------------*/
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u16_t
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rs232dev_poll(void)
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{
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u8_t c;
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static u8_t lastc;
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while(SIO_POLL(c)) {
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/* printf("c %x\n", c);*/
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switch(c) {
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case SLIP_ESC:
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lastc = c;
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break;
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case SLIP_END:
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lastc = c;
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/* End marker found, we copy our input buffer to the uip_buf
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buffer and return the size of the packet we copied. */
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memcpy(&uip_buf[UIP_LLH_LEN], slip_buf, len);
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tmplen = len;
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len = 0;
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return tmplen;
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default:
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if(lastc == SLIP_ESC) {
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lastc = c;
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/* Previous read byte was an escape byte, so this byte will be
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interpreted differently from others. */
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switch(c) {
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case SLIP_ESC_END:
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c = SLIP_END;
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break;
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case SLIP_ESC_ESC:
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c = SLIP_ESC;
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break;
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}
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} else {
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lastc = c;
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}
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slip_buf[len] = c;
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++len;
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if(len > MAX_SIZE) {
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len = 0;
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}
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break;
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}
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}
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return 0;
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}
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/*-----------------------------------------------------------------------------------*/
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/*
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* rs232dev_init():
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*
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* Initializes the RS232 device and sets the parameters of the device.
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*
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*/
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/*-----------------------------------------------------------------------------------*/
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void
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rs232dev_init(void)
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{
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char err;
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err = rs232_init(0);
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rs232_err(err);
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err = rs232_params(RS_BAUD_9600 | RS_BITS_8 | RS_STOP_1, RS_PAR_NONE);
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rs232_err(err);
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len = 0;
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return;
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}
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/*-----------------------------------------------------------------------------------*/
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