//set up byte swap function for readings transferred from
//E8491A shared memory to the PC
#define SWAP_FLOAT64(rdgs) | \ |
| |
{ unsigned char src[8]; |
| \ | |
*((double *)src) = | *((double *)rdgs); | \ | |
((unsigned char *) | (rdgs))[0] = ((unsigned char*) (src))[7]; \ | ||
((unsigned char *) | (rdgs))[1] = ((unsigned char*) (src))[6]; \ | ||
((unsigned char *) | (rdgs))[2] = ((unsigned char*) (src))[5]; \ | ||
((unsigned char *) | (rdgs))[3] = ((unsigned char*) (src))[4]; \ | ||
((unsigned char *) | (rdgs))[4] = ((unsigned char*) (src))[3]; \ | ||
((unsigned char *) | (rdgs))[5] = ((unsigned char*) (src))[2]; \ | ||
((unsigned char *) | (rdgs))[6] = ((unsigned char*) (src))[1]; \ | ||
((unsigned char *) | (rdgs))[7] = ((unsigned char*) (src))[0]; \ | ||
} |
|
|
|
// prototypes
void check(ViSession vi, ViStatus error); void err_handler(ViSession vi, ViStatus err);
void main(void)
{
ViSession vi, defaultRM, fw; ViStatus errStatus, err;
unsigned long start_addr;// starting address of shared memory ViReal64 rdgs[8000];// array for readings from shared memory int i;
ViChar err_message[256];
//open a VXIplug&play device session and reset the multimeter errStatus = hpe1410_init(E1410,0,1,&vi);
if( VI_SUCCESS > errStatus)
{
hpe1410_error_message( vi, errStatus, err_message); printf("Unable to open %s\n", E1410);
printf("hpe1410_init() returned error message %s\n", err_message); return;
}
//open a VISA session to the E8491A
viOpenDefaultRM(&defaultRM); viOpen(defaultRM,E8491, VI_NULL, VI_NULL, &fw);
//get E8491A shared memory base address viGetAttribute(fw, VI_ATTR_MEM_BASE, &start_addr);
//enable multimeter error detection
hpe1410_errorQueryDetect(vi, 1);
//set a 5s timeout period to allow functions to complete errStatus = hpe1410_timeOut(vi, 5000);
check(vi, errStatus);
//configure the multimeter for DCV measurements errStatus = hpe1410_confVoltDc(vi);
check(vi, errStatus);
Chapter 3 | VXI Programming Using the IEEE 1394 Serial Bus 51 |
