Teledyne LeCroy User-Defined Decoding (UDD) Advanced Script Language (ASL) Reference Manual - Manual (Page 15)

12
BitStuff
BitStuff ( FieldId , n )
Remark
If, in a protocol, one field transfers after bitstaffing algorithm, you can see actual value of that field
by the BitStaff statement. This statement actually runs a unstaff algorithm on specified field.
Parameters
FieldId is the fieldId defined in AddField.
n specifies number of bits for bitstuffing.
Example
/* Run the bitstuff algorithm on 5 bits of continues 1. */
Flag = AddField(0,8, "Falg","Falg","");
Data = AddField(8,LengthOf(INPUTDATA) - (CURPOS + 16),"Data","Data","");
FCS = AddField(CURPOS,16, "FCS","FCS","");
BitStaff(Data,5);
Note: The BitStaff function must be after all AddFields.
GetData
DataId = GetData ( StartBit, Length )
Remark
DataId is the fieldId defined in AddField.
This statement copies a data segment with given specification from INPUTDATA to DataId. You
can use copied data by referring to DataId. This function does not increase CURPOS. If you need
to know value of a segment of data without adding a field, use this statement.
Note: INPUTDATA is an ASL keyword that means input data steam will be passed to script for
decoding.
Parameters
StartBit specifies the start bit position of the specified field. Value of this parameter can be an
Expression.
Length specifies length of the specified data in bits. Value of this parameter can be an
Expression.
Example
/*This function puts Data from Bit#0 to Bit#9 in a dataId named D31.*/
DataSegment = GetData (0,9);