Teledyne-lecroy USB Script Decode Manual Manual de usuario descargar pdf (Pagina 10)

CHAPTER 2

CATC Scripting Language for USB Values

Escape Sequences

These are the available escape sequences in CSL:

Lists

A list can hold zero or more pieces of data. A list that contains zero pieces of data

is called an empty list. An empty list evaluates to false when used in an expression,

whereas a non-empty list evaluates to true. List literals are expressed using the

square bracket ([]) delimiters. List elements can be of any type, including lists.

[1, 2, 3, 4]

[]

["one", 2, "three", [4, [5, [6]]]]

Raw Bytes

Raw binary values are used primarily for efficient access to packet payloads. A

literal notation is supported using single quotes:

'00112233445566778899AABBCCDDEEFF'

This represents an array of 16 bytes with values starting at 00 and ranging up to

0xFF. The values can only be hexadecimal digits. Each digit represents a nybble

(four bits), and if there are not an even number of nybbles specified, an implicit zero

is added to the first byte. For example:

'FFF'

is interpreted as

'0FFF'

Null

Null indicates an absence of valid data. The keyword null represents a literal

null value and evaluates to false when used in expressions.

Character

Escape

Sequence Example Output

backslash \\ "This is a backslash: \\" This is a backslash: \

double quote \" "\"Quotes!\"" "Quotes!"

horizontal tab \t "Before tab\tAfter tab" Before tab After tab

newline \n "This is how\nto get a newline." This is how

to get a newline.

single quote \' "\'Single quote\'" 'Single quote'

Table 2.2: Escape Sequences

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 89 90

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Teledyne-lecroy USB Script Decode Manual Manual de usuario Pagina 10