vserial.c

用Dynamic C写的telnet程序

/*******************************************************************************
        vserial.c
        Z-World, 2001

        This demonstrates the use of the new VSERIAL.LIB, which provides
        a gateway between serial ports or serial-port-like devices, and
        a telnet-style TCP socket.

			- Serial Port C is telnet port 23
			- Serial Port B is telnet port 3023

*******************************************************************************/
#class auto

/***********************************
 * Configuration                   *
 * -------------                   *
 * All fields in this section must *
 * be altered to match your local  *
 * network settings.               *
 ***********************************/

/*
 * Pick the predefined TCP/IP configuration for this sample.  See
 * LIB\TCPIP\TCP_CONFIG.LIB for instructions on how to set the
 * configuration.
 */
#define TCPCONFIG 1

/******************
 * vserial config *
 ******************/
/*
 * Unique gateway identifiers
 *
 * Each gateway mapping must be uniquely identified
 * with a number. A macro for each will make the
 * code much easier to read. Here, they are named
 * after the serial port they use.
 */
#define GATEWAY_PORTC	1
#define GATEWAY_PORTB	2
#define GATEWAY_PORTA	3

/*
 * serial buffer sizes
 * These are necessary any time we use the given
 * serial ports, because of how RS232.LIB works.
 */
#define AINBUFSIZE	31
#define AOUTBUFSIZE	31
#define BINBUFSIZE	31
#define BOUTBUFSIZE	31
#define CINBUFSIZE	31
#define COUTBUFSIZE	31

/* uncomment this to see debug messages */
#define VSERIAL_DEBUG

/*
 * The number of gateways that will be specified. This
 * must match the number of rows in the VSerialSpecTable[]
 * that is defined below.
 */
#define VSERIAL_NUM_GATEWAYS	3

/*
 * Pull in the library
 */
#use "dcrtcp.lib"
#use "vserial.lib"

/*
 * This table defines the low-level serial routines used
 * to talk to the serial port hardware. Each row is one
 * possible hardware gateway. Because the builtin Rabbit
 * serial ports will be used often, shortcut-macros have
 * been defined for each of the ports, A-D. These macros
 * take as a parameter an identifier such that they can
 * be referenced by the vserial_* functions below.
 *
 * The commented-out row at the end of the table is a
 * pseudocode example of defining your own low-level
 * gateway interface, if another hardware interface is
 * required. Most of the parameters are function pointers
 * to RS232.LIB style I/O routines.
 */
const VSerialSpec VSerialSpecTable[] = {
	VSERIAL_PORTC(GATEWAY_PORTC),
	VSERIAL_PORTB(GATEWAY_PORTB),
	VSERIAL_PORTA(GATEWAY_PORTA)
	// { ID, myOpen, myClose, myTick, myReadBufUsed, myWriteBufFree, myRead, myWrite }
};

///////////////////////////////////////////////////////////////////////

void main()
{
	// This is necessary for initializing RS232 functionality of LP35XX boards.
#if _BOARD_TYPE_ == 0x1200 || _BOARD_TYPE_ == 0x1201
	brdInit();
#endif

	sock_init();

	/* Initilize the vserial library (parse the above structures) */
	if(vserial_init()) {
		printf("Error starting vserial library!\n");
		exit(-1);
	}

	/*
	 * enable our first serial->tcp mapping
	 *
	 * The VSERIAL_COOKED turnes on parsing of the telnet control
	 * codes. This is useful if the other side of the network is
	 * actuall telnet software. This does change the datastream, though,
	 * so if a raw, unaltered, datastream is required, this option should
	 * not be used.
	 *
	 *  Serial Port C is telnet port 23
	 *  Serial Port B is telnet port 3023
	 */
	if(vserial_listen(GATEWAY_PORTC,57600,23,0L,VSERIAL_COOKED)) {
		printf("Error listening!\n");
		exit(-1);
	}

	if(vserial_listen(GATEWAY_PORTB,57600,3023,0L,VSERIAL_COOKED)) {
		printf("Error listening!\n");
		exit(-1);
	}

	/*
	 * Force the tcp connection to be persistent. This causes
	 * TCP Keepalives to be sent on the socket periodicly. It is
	 * important to note that this can cause an amount of network
	 * traffic over time.
	 */
	if(vserial_keepalive(GATEWAY_PORTC,30)) {
		printf("Error setting keepalive!\n");
		exit(-1);
	}

	/*
	 * GATEWAY_PORTA is not used here, as that would cause the
	 * programming/debugging port (it uses serial port A as well)
	 * to lose connectivity. It could be used in a similar manner,
	 * though, with another vserial_listen() or vserial_open().
	 */

	/* run it */
	for(;;) {
		vserial_tick();
	}
}