Initial commit of original code

1 files changed, 208 insertions, 0 deletions

diff --git a/slip/slipdev.c b/slip/slipdev.c
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+/**
+ * \addtogroup uip
+ * @{
+ */
+
+/**
+ * \defgroup slip Serial Line IP (SLIP) protocol
+ * @{
+ *
+ * The SLIP protocol is a very simple way to transmit IP packets over
+ * a serial line. It does not provide any framing or error control,
+ * and is therefore not very widely used today.
+ *
+ * This SLIP implementation requires two functions for accessing the
+ * serial device: slipdev_char_poll() and slipdev_char_put(). These
+ * must be implemented specifically for the system on which the SLIP
+ * protocol is to be run.
+ */
+
+/**
+ * \file
+ * SLIP protocol implementation
+ * \author Adam Dunkels <adam@dunkels.com>
+ */
+
+/*
+ * 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: slipdev.c,v 1.1 2006/06/17 22:41:18 adamdunkels Exp $
+ *
+ */
+
+/*
+ * This is a generic implementation of the SLIP protocol over an RS232
+ * (serial) device. 
+ *
+ * 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 "uip.h"
+#include "uip-fw.h"
+#include "slipdev.h"
+#include <string.h>  /* For memcpy() */
+
+#define SLIP_END     0300
+#define SLIP_ESC     0333
+#define SLIP_ESC_END 0334
+#define SLIP_ESC_ESC 0335
+
+static u8_t slip_buf[UIP_BUFSIZE];
+
+static u16_t len, tmplen;
+static u8_t lastc;
+
+/*-----------------------------------------------------------------------------------*/
+/**
+ * Send the packet in the uip_buf and uip_appdata buffers using the
+ * SLIP protocol.
+ *
+ * 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.
+ *
+ * \return This function will always return UIP_FW_OK.
+ */
+/*-----------------------------------------------------------------------------------*/
+u8_t
+slipdev_send(void)
+{
+  u16_t i;
+  u8_t *ptr;
+  u8_t c;
+
+  slipdev_char_put(SLIP_END);
+
+  ptr = &uip_buf[UIP_LLH_LEN];
+  for(i = 0; i < uip_len; ++i) {
+    if(i == UIP_TCPIP_HLEN) {
+      ptr = (char *)uip_appdata;
+    }
+    c = *ptr++;
+    switch(c) {
+    case SLIP_END:
+      slipdev_char_put(SLIP_ESC);
+      slipdev_char_put(SLIP_ESC_END);
+      break;
+    case SLIP_ESC:
+      slipdev_char_put(SLIP_ESC);
+      slipdev_char_put(SLIP_ESC_ESC);
+      break;
+    default:
+      slipdev_char_put(c);
+      break;
+    }
+  }
+  slipdev_char_put(SLIP_END);
+
+  return UIP_FW_OK;
+}
+/*-----------------------------------------------------------------------------------*/
+/** 
+ * Poll the SLIP device for an available packet.
+ *
+ * This function will poll the SLIP device to see if a packet is
+ * available. It uses a buffer in which all avaliable bytes from the
+ * RS232 interface are read into. 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.
+ *
+ * \return The length of the packet placed in the uip_buf buffer, or
+ * zero if no packet is available.
+ */
+/*-----------------------------------------------------------------------------------*/
+u16_t
+slipdev_poll(void)
+{
+  u8_t c;
+  
+  while(slipdev_char_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 > UIP_BUFSIZE) {
+    len = 0;
+      }
+    
+      break;
+    }
+  }
+  return 0;
+}
+/*-----------------------------------------------------------------------------------*/
+/**
+ * Initialize the SLIP module.
+ *
+ * This function does not initialize the underlying RS232 device, but
+ * only the SLIP part.
+ */ 
+/*-----------------------------------------------------------------------------------*/
+void
+slipdev_init(void)
+{
+  lastc = len = 0;
+}
+/*-----------------------------------------------------------------------------------*/
+
+/** @} */
+/** @} */