Initializes the driver for the specified PXI slot using the default VISA provider.
GxFpgaInitializeVisa (szVisaResource, pnHandle, pnStatus)
Name |
Type |
Comments |
szVisaResource |
LPCTSTR |
String identifying the location of the specified board in order to establish a session. |
pnHandle |
PSHORT |
Returned Handle (session identifier) that can be used to call any other operations of that resource. |
pnStatus |
PSHORT |
Returned status: 0 on success, negative number on failure. |
The GxFpgaInitializeVisa opens a VISA session to the specified resource. The function uses the default VISA provider configured in your system to access the board. You must ensure that the default VISA provider support PXI/PCI devices and that the board is visible in the VISA resource manager before calling this function.
The first argument szVisaResource is a string that is displayed by the VISA resource manager such as NI Measurement and Automation (NI_MAX). It is also displayed by Geotest PXI/PCI Explorer as shown in the prior figure. The VISA resource string can be specified in several ways as follows:
Using chassis, slot, for example: “PXI0::CHASSIS1::SLOT5”
Using the PCI Bus/Device combination, for example: “PXI9::13::INSTR” (bus 9, device 9).
Using alias, for example: “FPGA1”. Use the PXI/PCI Explorer to set the device alias.
The function returns a board handle (session identifier) that can be used to call any other operations of that resource. The session is opened with VI_TMO_IMMEDIATE and VI_NO_LOCK VISA attributes. On terminating the application, the driver automatically invokes viClose() terminating the session.
The following example initializes a GX3700 boards at PXI bus 5 and device 11.
SHORT nHandle, nStatus;
GxFpgaInitializeVisa (“PXI5::11::INSTR”, &nHandle, &nStatus);
if (nHandle==0)
{
printf("Unable to Initialize the board")
return;
}