Teledyne-lecroy USB Script Decode Manual Manual de usuario descargar pdf (Pagina 41)

CHAPTER 11

CATC Scripting Language for USB Primitives

• A space will insert a space before a positive signed integer. This only works with the

conversion characters

d and i. If both a space and a plus sign are used, the space flag

will be ignored.

• A hash mark (#) will prepend a 0 to an octal number when used with the conversion

character

o.If# is used with x or X, it will prepend 0x or 0X to a hexadecimal

number.

• A zero (0) will pad the field with zeros instead of with spaces.

• Field width specification is a positive integer that defines the field width, in spaces, of the

converted argument. If the number of characters in the argument is smaller than the field

width, then the field is padded with spaces. If the argument has more characters than the

field width has spaces, then the field will expand to accommodate the argument.

GetNBits()

GetNBits (<bit_source list or raw>, <bit_offset

integer>, <bit_count integer>)

Return value

None.

Comments

Reads bit_count bits from bit_source starting at bit_offset. Will

return null if bit_offset + bit_count exceeds the number of bits in

bit_source.Ifbit_count is 32 or less, the result will be returned as an

integer. Otherwise, the result will be returned in a list format that is the same as the

input format. GetNBits also sets up the bit data source and global bit offset used

by NextNBits and PeekNBits. Note that bits are indexed starting at bit 0.

Example

raw = 'F0F0'; # 1111000011110000 binary

result = GetNBits ( raw, 2, 4 );

Trace ( "result = ", result );

The output would be

Parameter Meaning Default Value Comments

bit_source list, raw, or

integer

Can be an integer value (4 bytes) or a list of inte-

gers that are interpreted as bytes.

bit_offset integer Index of bit to

start reading

from

bit_count integer Number of

bits to read

1 2 ... 36 37 38 39 40 41 42 43 44 45 46 ... 89 90

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Teledyne-lecroy USB Script Decode Manual Manual de usuario Pagina 41