sio.c

NXPl788上lwip的无操作系统移植,基于Embest开发板

/* Author: Magnus Ivarsson <[e-mail]> */

#include "netif/sio.h" 
#include "netif/fifo.h"
#include "lwip/debug.h"
#include "lwip/def.h"
#include "lwip/sys.h"
#include "lwip/arch.h"

/* Following #undefs are here to keep compiler from issuing warnings
   about them being double defined. (They are defined in lwip/inet.h
   as well as the Unix #includes below.) */
#undef htonl
#undef ntohl
#undef htons
#undef ntohs
#undef HTONL
#undef NTOHL
#undef HTONS
#undef NTOHS

#include <stdlib.h>
#if defined(openbsd)
#include <util.h>
#endif
#include <termios.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <signal.h>
#include <sys/signal.h>
#include <sys/types.h>

#if PPP_SUPPORT && defined(linux)
#include <pty.h>
#endif

/*#define BAUDRATE B19200 */
/*#define BAUDRATE B57600 */
#define BAUDRATE B115200

#ifndef TRUE
#define TRUE  1
#endif
#ifndef FALSE
#define FALSE 0
#endif

/* for all of you who dont define SIO_DEBUG in debug.h */
#ifndef SIO_DEBUG
#define SIO_DEBUG 0
#endif


/*  typedef struct siostruct_t */
/*  {  */
/*  	sio_status_t *sio; */
/*  } siostruct_t; */

/** array of ((siostruct*)netif->state)->sio structs */
static sio_status_t statusar[3];

#if ! PPP_SUPPORT
/* --private-functions----------------------------------------------------------------- */
/** 
 * Signal handler for ttyXX0 to indicate bytes received 
 * one per interface is needed since we cannot send a instance number / pointer as callback argument (?)
 */
static void	signal_handler_IO_0( int status )
{
	LWIP_UNUSED_ARG(status);
	LWIP_DEBUGF(SIO_DEBUG, ("SigHand: rxSignal channel 0\n"));
	fifoPut( &statusar[0].myfifo, statusar[0].fd );
}

/**
 * Signal handler for ttyXX1 to indicate bytes received 
 * one per interface is needed since we cannot send a instance number / pointer as callback argument (?)
 */
static void signal_handler_IO_1( int status )
{
	LWIP_UNUSED_ARG(status);
	LWIP_DEBUGF(SIO_DEBUG, ("SigHand: rxSignal channel 1\n"));
	fifoPut( &statusar[1].myfifo, statusar[1].fd );
}
#endif

/**
* Initiation of serial device 
* @param device : string with the device name and path, eg. "/dev/ttyS0"
* @param netif  : netinterface struct, contains interface instance data
* @return file handle to serial dev.
*/
static int sio_init( char * device, int devnum, sio_status_t * siostat )
{
	struct termios oldtio,newtio;
#if ! PPP_SUPPORT
	struct sigaction saio;           /* definition of signal action */
#endif
	int fd;
	LWIP_UNUSED_ARG(siostat);

	/* open the device to be non-blocking (read will return immediately) */
	fd = open( device, O_RDWR | O_NOCTTY | O_NONBLOCK );
	if ( fd < 0 )
	{
		perror( device );
		exit( -1 );
	}

#if ! PPP_SUPPORT
	/* install the signal handler before making the device asynchronous */
	switch ( devnum )
	{
		case 0:
			LWIP_DEBUGF( SIO_DEBUG, ("sioinit, signal_handler_IO_0\n") );
			saio.sa_handler = signal_handler_IO_0;
			break;
		case 1:
			LWIP_DEBUGF( SIO_DEBUG, ("sioinit, signal_handler_IO_1\n") );
			saio.sa_handler = signal_handler_IO_1;
			break;
		default:
			LWIP_DEBUGF( SIO_DEBUG,("sioinit, devnum not allowed\n") );
			break;
	}

	saio.sa_flags = 0;
#if linux
	saio.sa_restorer = NULL;
#endif /* linux */
	sigaction( SIGIO,&saio,NULL );

	/* allow the process to receive SIGIO */
	fcntl( fd, F_SETOWN, getpid( ) );
	/* Make the file descriptor asynchronous (the manual page says only
	O_APPEND and O_NONBLOCK, will work with F_SETFL...) */
	fcntl( fd, F_SETFL, FASYNC );
#else
	fcntl( fd, F_SETFL, 0 );
#endif /* ! PPP_SUPPORT */

	tcgetattr( fd,&oldtio ); /* save current port settings */
	/* set new port settings */
	/* see 'man termios' for further settings */
	newtio.c_cflag = BAUDRATE | CS8 | CLOCAL | CREAD | CRTSCTS;
	newtio.c_iflag = 0;
	newtio.c_oflag = 0;
	newtio.c_lflag = 0; /*ECHO; */
	newtio.c_cc[VMIN] = 1; /* Read 1 byte at a time, no timer */
	newtio.c_cc[VTIME] = 0;

	tcsetattr( fd,TCSANOW,&newtio );
	tcflush( fd, TCIOFLUSH );

	return fd;
}

/**
*
*/
static void sio_speed( int fd, int speed )
{
	struct termios oldtio,newtio;
	/*  int fd; */

	LWIP_DEBUGF( 1,("sio_speed: baudcode:%d  enter\n",speed ) );

	if ( fd < 0 )
	{
		LWIP_DEBUGF(SIO_DEBUG, ( "sio_speed: fd ERROR\n" ));
		exit( -1 );
	}

	tcgetattr( fd,&oldtio ); /* get current port settings */

	/* set new port settings 
	* see 'man termios' for further settings */
	newtio.c_cflag = speed | CS8 | CLOCAL | CREAD; /*