DSP TP104-plus Dokumentacja Pobierz pdf (Strona 112)

5-28

Remote Programming

void printOutIEEEResults(void)

{

/* prints the first 10 values of R transferred in IEEE floating point format by the SR830 */

int i;

printf("\n\n");

for (i=0;i<10;i++)

printf("%d %e\n",i,rfBuf[i]); /* this is simple since the values are already IEEE floats */

}

void printOutLIAResults(void)

{

/* calculates the first 10 values of R transferred in LIA float format by the SR830 */

int i,mant,exp;

int *ptr;

float val;

printf("\n\n");

ptr =(int *) rfBuf; /* ptr points to integers in rfBuf, not floats! */

for (i=0;i<10;i++) {

mant = *ptr++; /* first comes the mantissa (16 bits) */

exp = *ptr++ - 124; /* then the binary exponent (16 bits) offset by 124 */

val = (float) mant * (float) pow(2.0,(double) exp);

printf("%d %e\n",i,val);

}

void initGpib(char *devName)

{

if ((lia=ibfind(devName))<0) {

printf("\nCannot Find SR830 \n\a");

exit(1);

}

void txLia(char *str)

{

char serPol;

ibwrt(lia,str,strlen(str));

do {

ibrsp(lia,&serPol); /* now poll for IFC RDY */

} while ((serPol&2)==0); /* until the command finishes executing */

}

void setupLia(void)

{

txLia("*RST"); /* initialize the lock-in */

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DSP TP104-plus Dokumentacja Strona 112