HP E8491A manual Locating Shared Memory Using HP Visa

Locating Shared Memory Using HP VISA

For HP VISA programs, the E8491A shared memory starting address is obtained using the function:

viGetAttribute

and the VXI interface attribute:

VI_ATTR_MEM_BASE

The HP VISA version of the example “Storing Readings in Shared Memory” demonstrates the use of this function and attribute.

Locating Shared Memory Using SICL

For SICL programs, the E8491A shared memory starting address is found using the function:

ivxirminfo

This function fills the structure struct vxiinfo. The item within the structure containing the starting address is memstart. The SICL version of the example program showing the use of shared memory demonstrates the use of this function and structure.

Locating Shared Memory by Viewing the Resource Manager Output

The third method of determining the E8491A’s shared memory starting address is to view the resource manager output. “Viewing the Resource Manager Output” in Chapter 2 describes how this is done using the ‘I_O Config’ utility. Figure 3-3 shows the section of the output that indicates A24 address mapping.

Another way to view the output is using the SICL ivxisc utility contained in the <drive:>\siclnt\bin or sicl95\bin directory. This utility is an executable that is used with the SICL logical unit number (see “Editing the HP E8491A Configuration” in Chapter 2) to return the configuration output of the resource manager. Again, Figure 3-3 shows a partial listing of the output.

Note Refer to Appendix B for additional information on using ivxisc and for an example of the complete configuration output.

48 VXI Programming Using the IEEE 1394 Serial Bus Chapter 3