Teledyne LeCroy USB Chief - File Based Decode Manual - Manual (Page 13)

9
C OMPUTER A CCESS T ECHNOLOGY C ORPORATION USB R EQUEST D EFINITION (. REQ ) F ILES
Reference Manual
the output changes to this:
A FormatValue entry can also be used somewhat like the 'else' portion of an if-
else statement to specify the formatting of default behaviors. To do this, place the
FormatValue entry inside the definition for which it will act as the default value.
If the request value matches a value that is specified in the definition, then the
meaning for that value will display in the trace field; otherwise, the
FormatValue
default definition will be used. The following examples are taken from the sample
printer.req file. In the first example, from the
GET_DEVICE_ID request definition,
there is no specified format for the default value of wValue :
wValue={
Depends(bmRequestType)={
0xA1={
FormatValue=Configuration Index is 0x%04X
}
}
}
Therefore, the default, unformatted trace output for the wValue field displays as
such:
However, when FormatValue is used to control its appearance, as in the
following example,
wValue={
Depends(bmRequestType)={
0xA1={
FormatValue=Configuration Index is 0x%04X
}
}
FormatValue=GET_DEVICE_ID default is %d
}
Figure 4: Resulting trace output for the altered FormatValue
definition
Figure 5: Default trace
output with no formatting
specifications