| /* |
| * 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. All advertising materials mentioning features or use of this software |
| * must display the following acknowledgement: |
| * This product includes software developed by Adam Dunkels. |
| * 4. 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 1.2 2005/02/23 22:45:38 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 "rs232.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) rs232_put(c) |
| |
| #define MAX_SIZE (UIP_BUFSIZE - UIP_LLH_LEN) |
| |
| static u8_t slip_buf[MAX_SIZE + 2]; |
| |
| #if MAX_SIZE > 255 |
| static u16_t len, tmplen; |
| #else |
| static u8_t len, tmplen; |
| #endif /* MAX_SIZE > 255 */ |
| |
| #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) |
| { |
| #if MAX_SIZE > 255 |
| u16_t i; |
| #else |
| u8_t i; |
| #endif /* MAX_SIZE > 255 */ |
| 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 = (char *)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. |
| * |
| */ |
| /*-----------------------------------------------------------------------------------*/ |
| #if MAX_SIZE > 255 |
| u16_t |
| #else |
| u8_t |
| #endif /* MAX_SIZE > 255 */ |
| 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; |
| } |
| /*-----------------------------------------------------------------------------------*/ |
| |