HP 34970A manual BB9

Chapter 7 Application Programs

Example Programs for C and C++

do{ /* Stay in loop until the srqFlag goes negative */ index = 1;

for (count = 0; count <45; count++)

{

index = 0; printf(".");

}

printf(" srq flag = %d\n",srqFlag);

}

while (srqFlag>=0); /* A negative srqFlag indicates scan is done */ /* The instrument is done, so close the SRQ handler */

viDisableEvent(DataAcqu,VI_EVENT_SERVICE_REQ,VI_HNDLR); viUninstallHandler (DataAcqu,VI_EVENT_SERVICE_REQ,SRQ_handler,(ViAddr)10);

viPrintf (DataAcqu,"FETCH?\n");	/* Get all the readings */
viScanf(DataAcqu,"%,10lf",&volt); /* Put readings into an array */

for (index = 0;index<10;index++){ /* Print the readings */ printf("reading %d = %lf\n",index+1,volt[index]);

}

viClose (DataAcqu);	/* Close the communication port */
viClose (defaultRM);
}

/* This function will be called when the instrument interrupts the controller with an SRQ for alarm and/or Operation Complete */

ViStatus _VI_FUNCH SRQ_handler(ViSession DataAcqu, ViEventType eventType, ViEvent context,ViAddr userHdlr)

{

ViUInt16 statusByte;

viReadSTB(DataAcqu,&statusByte); /* Read status byte register and clear SRQ */ /* Bit 6 (64) indicates this SRQ is for our instrument, bit 1 (2) indicates

an alarm, and bit 5 (32) indicates the standard event register; so alarm 64+2=66; OPC 64+32=96; both 64+32+2=98 */

if ((statusByte==66)(statusByte==98)){

srqFlag = 1; /* Set flag to indicate this is an alarm */

viPrintf (DataAcqu,"STATUS:ALARM:EVENT?\n"); /* Check and clear alarm */ viScanf(DataAcqu,"%s",&reply_string);

printf("alarm event; bit = %s\n",reply_string);

}

if ((statusByte==96)(statusByte==98)){

srqFlag = -1; /* Set flag to indicate end of operation */ viPrintf (DataAcqu,"*ESR?\n"); /* Check and clear ESR bit */ viScanf(DataAcqu,"%s",&reply_string);

printf("Standard Event Register; bit %s\n",reply_string);

}

return VI_SUCCESS;

}

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BB9