/* **************************************************************************** *  newton_parse.c * * Parse the Newton's serial data stream into a useful format. * * David Huggins * July 1997 * * Copyright (c) 1997 Georgia Tech Research Corporation * All Rights Reserved * * ************************************************************************** */#include <stdio.h>#include <string.h>#include <sys/ioctl.h>#include "newton.h"#define START_OF_FRAME_CHAR 36 /* ASCII for $ */ #define CHANNEL_A_CHAR      35 /* ASCII for # */#define CHANNEL_B_CHAR      38 /* ASCII for & */#define CHANNEL_C_CHAR      94 /* ASCII for ^ */#define MAX_OBJS            4 void NewtonParse(){ static char lastchar = '0'; char thischar; char dummy; int  chan, num; int  i, j, k; int  frame; int  ret_count; int  a, x, y, ax; int  otype;#ifdef NEWTONDEBUG   printf( "NewtonParse: looking for a frame.." );#endif   i = j = k = 0;   /* flush everything first */   /* fpurge(newton_file);  doesn't seem to work on linux*/   if ( ioctl(newton_channel, TCFLSH, (void *)TCIOFLUSH) < 0) {     fprintf(stderr,"NewtonParse: error flushing port\n");   }   /* look for the start of a data frame */   thischar = lastchar;   while (thischar != START_OF_FRAME_CHAR)	thischar = (char)fgetc(newton_file);   /* discard the frame number */   fscanf( newton_file, "%2x", &frame );#ifdef NEWTONDEBUG   printf( "NewtonParse: found frame number: %d\n", frame );#endif   /* look for the channel indicator */   thischar = (char)fgetc(newton_file);   while (thischar != START_OF_FRAME_CHAR) {     ret_count = fscanf( newton_file, "%2x:%2x:%2x:%2x", 			 &a, &x, &y, &ax);     /* make sure we got all the data */     if (ret_count == 4) {       switch( thischar ) {       case CHANNEL_A_CHAR :	 num = i++;	 chan = CHANNEL_A;	 break;       case CHANNEL_B_CHAR :	 num = j++;	 chan = CHANNEL_B;	 break;       case CHANNEL_C_CHAR :	 num = k++;	 chan = CHANNEL_C;	 break;       default: chan = -1;       }       if ((chan>=0)&&(chan<NUMBER_OF_TYPES)&&(num<MAX_OBJECTS)) {#if NEWTONDEBUG	 printf( "parsed chan %d %d (x %d, y %d) - area %d axis %d\n", 		 chan, num,       x,    y,         a,      ax);#endif	 LocalScreenObjects[chan][num].area = a;	 LocalScreenObjects[chan][num].y    = y;	 LocalScreenObjects[chan][num].x    = x;	 LocalScreenObjects[chan][num].axis = ax;       }       if (num >= MAX_OBJS) break;     }     else {       /*-- printf("Not 4 - fscanf failed: %d\n",ret_count); --*/       /* look for next frame */       thischar = (char)fgetc(newton_file);       while (thischar != START_OF_FRAME_CHAR)	 thischar = (char)fgetc(newton_file);       if ( fscanf( newton_file, "%2x", &frame )!=1 )	 printf("did not get next frame\n");     }     thischar = (char)fgetc(newton_file);   }   lastchar = thischar;   /* update the counter */   NumberFound[CHANNEL_A] = i;   NumberFound[CHANNEL_B] = j;   NumberFound[CHANNEL_C] = k;#ifdef NEWTONDEBUG   printf("ParseNewton: number of items %d %d %d\n",i,j,k);#endif#ifdef NEWTONDEBUG   printf( "ParseNewton completed a frame\n" );   for (otype=0; otype<NUMBER_OF_TYPES; otype++) {     for (i=0; i<NumberFound[otype]; i++) {       printf( "channel %d - (x %d,y %d ) axis %d area %d\n",	       otype,	       LocalScreenObjects[otype][i].x,	       LocalScreenObjects[otype][i].y,	       LocalScreenObjects[otype][i].axis,	       LocalScreenObjects[otype][i].area );     }   }#endif} /* ***** NEWTON_PARSE.C ***** */