Artesyn BajaPPC-750, User Manual

Page: 200 / 215

Standard Artesyn Functions 10-61
0002M621-15
} NVEx;
NVField ExFields[] = {
{ “XPos”, (char *) &NVEx.XPos, sizeof(NVEx.XPos),
NV_TYPE_DECIMAL, 0, 100, NULL},
{ “YPos”, (char *) &NVEx.YPos, sizeof(NVEx.YPos),
NV_TYPE_DECIMAL, 0, 200, NULL},
{ “Depth” (char *) &NVEx.Mag, sizeof(NVEx.Mag),
NV_TYPE_DECIMAL, 0, 4, NULL}
}
NVGroup ExGroups[] = {
{ “Window”, sizeof(ExFields)/sizeof(NVField), ExFields }
};
If passed a pointer to the ExGroups structure, the function DispGroup gen-
erates the display shown below. The second parameter EditFlag indicates
whether to allow changes to the data structure after it is displayed (same as in
the
nvdisplay command).
Window Display Configuration
XPos 100
YPos 200
Magnitude 4
The SetNvDefaults function, when called with a pointer to the ExGroup
structure, initializes the data structure to those values specified in the
NVGroup structure. The second parameter
NumGroups indicates the number
of groups to be initialized.
The NVOp function stores and recovers data structures from nonvolatile
memory. The only requirement of the data structure to be stored in nonvola-
tile memory is that the first field of the structure be NVInternal, which is
where all the bookkeeping for the nonvolatile memory section is done. The
first parameter
NVOpCmd indicates the command to be performed. A sum-
mary of the commands is shown in the following table:
The second parameter, Base , indicates the base address of the data structure to
be operated on, and the Size parameter indicates the size of the data structure
to be operated on. The Offset parameter specifies the byte offset in the non-
volatile memory device where the data structure is to be stored. An example
of how to initialize, store, and recall the example data structure is shown
below.
Table 10-7. NVOp Commands
Command Value Description
NV_OP_FIX 0 Fix nonvolatile section checksum.
NV_OP_CLEAR 1 Clear nonvolatile section.
NV_OP_CK 2 Check if nonvolatile section is valid.
NV_OP_OPEN 3 Open nonvolatile section.
NV_OP_SAVE 4 Save nonvolatile section.
NV_OP_CMP 5 Compare nonvolatile section data.