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Diffstat (limited to 'src/rs232dev.c')
| -rw-r--r-- | src/rs232dev.c | 299 |
1 files changed, 299 insertions, 0 deletions
diff --git a/src/rs232dev.c b/src/rs232dev.c new file mode 100644 index 0000000..9738fce --- /dev/null +++ b/src/rs232dev.c @@ -0,0 +1,299 @@ +/* + * 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 1.1 2001/11/20 20:49:45 adam 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 <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 "uip.h" + +#include "features.h" + +#ifdef FEAT_KEYBOARD_BUFFER +#include "keybuf.h" +#endif + +#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 + +static u8_t slip_buf[MAX_SIZE]; + +#if MAX_SIZE > 255 +static u16_t len, tmplen; +#else +static u8_t len, tmplen; +#endif /* MAX_SIZE > 255 */ + +#if 0 +#define printf(x) +#else +#include <stdio.h> +#endif + +#ifdef FEAT_TRAFFIC_INDICATOR +#include <peekpoke.h> +/* FujiChat screen stuff */ +static u16_t traffic_indicator; +static char old_char; + +#define DOWN_ARROW 0xdd +#define UP_ARROW 0xdc + +#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 */ + volatile u8_t *ptr; + u8_t c; + +#ifdef FEAT_TRAFFIC_INDICATOR + old_char = PEEK(traffic_indicator); + POKE(traffic_indicator, UP_ARROW); +#endif + + SIO_SEND(SLIP_END); + + ptr = uip_buf; + for(i = 0; i < uip_len; ++i) { + if(i == 40) { + 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; + } +#ifdef FEAT_KEYBOARD_BUFFER + keybuf_poll_kbd(); +#endif + } + SIO_SEND(SLIP_END); + +#ifdef FEAT_TRAFFIC_INDICATOR + POKE(traffic_indicator, old_char); +#endif +} + +/*-----------------------------------------------------------------------------------*/ +/* + * 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; + +#ifdef FEAT_TRAFFIC_INDICATOR + old_char = PEEK(traffic_indicator); +#endif + + while(SIO_POLL(c)) { +#ifdef FEAT_TRAFFIC_INDICATOR + POKE(traffic_indicator, DOWN_ARROW); +#endif +#ifdef FEAT_KEYBOARD_BUFFER + keybuf_poll_kbd(); +#endif + 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; +#ifdef FEAT_TRAFFIC_INDICATOR + POKE(traffic_indicator, old_char); +#endif + 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; + } + } + +#ifdef FEAT_TRAFFIC_INDICATOR + POKE(traffic_indicator, old_char); +#endif + return 0; +} + +/*-----------------------------------------------------------------------------------*/ +/* + * rs232dev_init(): + * + * Initializes the RS232 device and sets the parameters of the device. + * + */ +/*-----------------------------------------------------------------------------------*/ + +char rs232dev_init(unsigned char baud) { + char err; + +#ifdef FEAT_TRAFFIC_INDICATOR + traffic_indicator = PEEKW(0x58) + 39; /* upper-right corner */ +#endif + + err = rs232_init(0); + rs232_err(err); + err = rs232_params(baud, RS_PAR_NONE); + rs232_err(err); + + len = 0; + + return err; +} +/*-----------------------------------------------------------------------------------*/ + +void rs232dev_close(void) { + rs232_done(); +} |