Experimental Physics and
Industrial Control System

John Faucett <[email protected]> · Wed, 24 Apr 2002 10:05:45 -0600

I'm writing device support for a Racal 3161 VXI Waveform Generator
with a Baja68K IOC. Has anyone else done this? Everything works
except for the shared memory download. Here's the commands:
OUTP OFF;:TRAC DEF 1,32,1;:TRAC SEL 1
SMEM:MODE WRITE;:SMEM:STAT ON
*OPC?
(wait for response to be 1)
(copy array of short integers to A24 memory)
SMEM:STAT OFF;:FUNC:MODE USER;:OUTP ON;:OUTP:SYNC ON
The copy routine is (in simplified form)
#include <drvEpvxi.h>
LOCAL STATUS copy_n_points( int la, short *points, int n) {
    short *pbase;
    struct vxi_csr *pcsr;
    char  *VMEaddr = NULL;
    pcsr = VXIBASE( la);
    VMEaddr = ( char *) ( pcsr->dir.w.offset<<8);
    sysBusToLocalAdrs( VME_AM_STD_SUP_DATA, VMEaddr, ( char **) &pbase);
    memcpy(( void *) pbase, ( void *) points, 2*n);
}
If I copy a large number of points, say 1000, the waveform changes,
although it isn't what I expect. Copying a small number of points
has no effect. Perhaps this indicates that pbase is being calculated
incorrectly.

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System