Teledyne-lecroy Protocol Analyzers File-Based Decoding User Manual Bedienungsanleitung PDF herunterladen (Seite 46)

Chapter 11: Primitives File-based Decoding User Manual

40 LeCroy Corporation

GetNBits()

GetNBits (<bit_source list or raw>, 

<bit_offset integer>, <bit_count integer>)

Parameter Meaning

Default

Value Comments

bit_source li

st, raw,

or integer

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

integers that are interpreted as bytes.

bit_offset in

teger Index of bit to start

reading from

bit_count integer Number of bits to

read

Support

Supported by all LeCroy analyzers.

Return value

None.

Comments

Reads bit_count bits from bit_source starting at bit_offset. Returns null if

bit_offset + bit_count exceeds the number of bits in bit_source. If bit_count

is 32 or

less, the result is returned as an integer. Otherwise, the result is returned in a list

format that is the same as the input format. GetNBits also sets up the bit data source

d 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 );

The return value is given in hexadecimal, so in binary it is 1100.The function returns:

A call to GetNBits, starting at bit 2, reads 4 bits (1100), and returns the value 0xC.

1 2 ... 41 42 43 44 45 46 47 48 49 50 51 ... 81 82

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Teledyne-lecroy Protocol Analyzers File-Based Decoding User Manual Bedienungsanleitung Seite 46