/** * \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 */ /* * 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 1.1.2.3 2003/10/07 13:23:01 adam Exp $ * */ /* * This is a generic implementation of the SLIP protocol over an RS232 * (serial) device. * * Huge thanks to Ullrich von Bassewitz of cc65 fame for * and endless supply of bugfixes, insightsful comments and * suggestions, and improvements to this code! */ #include "uip.h" #include "slipdev.h" #include "usart.h" #include //Define frequency #define F_CPU 16000000UL #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. * */ /*-----------------------------------------------------------------------------------*/ void slipdev_send(void) { u16_t i; u8_t *ptr; u8_t c; slipdev_char_put(SLIP_END); ptr = uip_buf; for (i = 0; i < uip_len; ++i) { if (i == 40) { ptr = (u8_t *)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); } /*-----------------------------------------------------------------------------------*/ /** * 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 ((u8_t)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, 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; // ボーレート選択 //uart_init(BAUD_CALC(1200)); //uart_init(BAUD_CALC(2400)); //uart_init(BAUD_CALC(4800)); //uart_init(BAUD_CALC(9600)); //uart_init(BAUD_CALC(19200)); //uart_init(BAUD_CALC(38400)); uart_init(BAUD_CALC(57600)); //uart_init(BAUD_CALC(115200)); // 無理 sei(); } /*-----------------------------------------------------------------------------------*/ /** * Additional Method */ void slipdev_char_put(u8_t c) { uart_putc((char)c); } u8_t slipdev_char_poll(u8_t *c) { if (uart_AvailableBytes() > 0) { *c = (u8_t)uart_getc(); return 1; } return 0; } /** @} */ /** @} */