i have a problem may be somebody can help me. I am sending data from my USB RAW to the computer and i want to enable the USB interrupt with visa commands in order that when there is an interrupt(when the device sends data) my program in CVI gets the values from the USB.
i have tryed in diferent ways but always i got an error setup on the function, and the program dos not run.I have read the only example that is on the user manual but i have still the problem, i have declarated my funciton, installed the handler, but when i want to eneble the VI_EVENT_USB_INT is when the problem appears, the error code says :
ViEnableEvent : Unable to start operation because setup is invalid (due to attributes being set to an inconsistent state)
The code that i am using is the next:
//headers files
static unsigned char FF6[513];
static ViStatus status;
static ViSession defaultRM;
static ViSession instrument;
static ViObject instrument;
static int panelHandle;
static int start=0;
static ViBuf Userhandle;
static ViEvent eventContext;
static ViUInt32 retcount;
static ViEventType etype;
//USB int event handler
ViStatus _VI_FUNCH myCallback(ViSession instrument, ViEventType etype, ViEvent eventContext, ViAddr UserHandle)
{
//printf("hola");
//ViUInt32 retcount;
//ViJobId jobID;
//ViUInt16 stb;
//status = viReadSTB (instrument, &stb);
//status = viReadSTB(vi, &stb);
//status = viReadAsync(vi,(ViBuf)UserHandle,512,&jobID);
status = viRead (instrument, FF6, 512, &retcount); //read the values of fifo6
return VI_SUCCESS;
}
int main (int argc, char *argv[])
{
// ViBuf Userhandle;
// ViEvent eventContext;
// ViEventType etype;
if (InitCVIRTE (0, argv, 0) == 0)
return -1; /* out of memory */
if ((panelHandle = LoadPanel (0, "usb.uir", PANEL)) < 0)
return -1;
status = viOpenDefaultRM (&defaultRM); //we open the Resource Manager
if (status < VI_SUCCESS) /*Check if we have an Error Initializing VISA...exiting*/
return -1;
status = viOpen (defaultRM, "USB0::0x04B4::0x1002::NI-VISA-0::RAW", VI_NULL, VI_NULL, &instrument); //we open the communication with our instrument
if (status < VI_SUCCESS) /*Check if we have an Error Initializing instrument...exiting*/
return -1;
viFlush (instrument, VI_WRITE_BUF_DISCARD);
viFlush (instrument, VI_READ_BUF_DISCARD);
Userhandle = (ViBuf)malloc(512);
status = viInstallHandler (instrument, VI_EVENT_USB_INTR, myCallback, Userhandle);
if (status < VI_SUCCESS) /*Check if we have an Error to istall the handler for the USB INT */
return -1;
status = viEnableEvent (instrument, VI_EVENT_USB_INTR, VI_HNDLR, VI_NULL);
if (status < VI_SUCCESS) /*Check if we have an Error to istall the handler for the USB INT ************************** Here is the problem ***************************/
return -1;
DisplayPanel (panelHandle);
RunUserInterface ();
DiscardPanel (panelHandle);
return 0;
}
I hope you can indentify where is my mistake, also i would like to know if you can send me and example using events, that will be very usefull for me, Thanks
