/* * 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 2007/11/19 23:00:56 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 <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(); } } /*-----------------------------------------------------------------------------------*/