tracker/readraw/readsig.c

/*
 * include needed system headers
 */
#include <stdio.h>       /* include standard i/o library */
#include <stdlib.h>      /* include standard library */
#include <string.h>      /* include string library */
#include <unistd.h>      /* include unix standard library */
#include <sys/types.h>   /* */
#include <sys/stat.h>    /* */
#include <fcntl.h>       /* */
#include <errno.h>       /* error simbol definitions */
#include <time.h>        /* system time definitions */
#include <math.h>        /* math library */

void readsig_(float *sig_buf, int *error, int *fd)

{
    int nread;
    int i;
    unsigned short word;
    unsigned short decimals,units;
    unsigned short sig_buf_temp[1024];
    

    *error=0;

/*** read the buffer ***/
    nread=read(*fd, sig_buf_temp, 2*1024);
    if( nread==0 ) {
        printf("readsig: Unexpected end of file %d at %d \n",*fd,nread);
        *error=1;
        return ;
    }
    if ( nread != 2*1024) {
        printf("readsig: Error on reading: nread = %d \n",nread);
        *error=-1;
        return ; 
    }


/*** correct byte ***/ //endianess...
    for(i=0; i<1024; i++) {
        word = sig_buf_temp[i];
        sig_buf_temp[i] = ( (word&0x00ff) << 8 ) | ( (word&0xff00) >> 8 );
    }


    /***interpreta*/
    for(i=0; i<1024; i++) {

        word = sig_buf_temp[i];
        units = ( (word >> 4) & 0x0fff ) ;
        decimals = (word & 0x000f) ;
        sig_buf[i] = (float)units + (float)decimals / 16.;
//      printf("%i %i %i %f \n",i,units,decimals,sig_buf[i]);
    }


//    for( i=0; i<1024; i++) printf("%x \n",sig_buf[i]);//???

    return; 
}
1	/*
2	* include needed system headers
3	*/
4	#include <stdio.h> /* include standard i/o library */
5	#include <stdlib.h> /* include standard library */
6	#include <string.h> /* include string library */
7	#include <unistd.h> /* include unix standard library */
8	#include <sys/types.h> /* */
9	#include <sys/stat.h> /* */
10	#include <fcntl.h> /* */
11	#include <errno.h> /* error simbol definitions */
12	#include <time.h> /* system time definitions */
13	#include <math.h> /* math library */
14
15	void readsig_(float sig_buf, int error, int *fd)
16
17	{
18	int nread;
19	int i;
20	unsigned short word;
21	unsigned short decimals,units;
22	unsigned short sig_buf_temp[1024];
23
24
25	*error=0;
26
27	/* read the buffer */
28	nread=read(fd, sig_buf_temp, 21024);
29	if( nread==0 ) {
30	printf("readsig: Unexpected end of file %d at %d \n",*fd,nread);
31	*error=1;
32	return ;
33	}
34	if ( nread != 2*1024) {
35	printf("readsig: Error on reading: nread = %d \n",nread);
36	*error=-1;
37	return ;
38	}
39
40
41	/* correct byte */ //endianess...
42	for(i=0; i<1024; i++) {
43	word = sig_buf_temp[i];
44	sig_buf_temp[i] = ( (word&0x00ff) << 8 ) \| ( (word&0xff00) >> 8 );
45	}
46
47
48	/**interpreta/
49	for(i=0; i<1024; i++) {
50
51	word = sig_buf_temp[i];
52	units = ( (word >> 4) & 0x0fff ) ;
53	decimals = (word & 0x000f) ;
54	sig_buf[i] = (float)units + (float)decimals / 16.;
55	// printf("%i %i %i %f \n",i,units,decimals,sig_buf[i]);
56	}
57
58
59
60	// for( i=0; i<1024; i++) printf("%x \n",sig_buf[i]);//???
61
62	return;
63	}