Sequence Count Module

This module provides generic sequence counter abstractions and implementation which are commonly needed when working with space packet protocols.

class spacepackets.seqcount.CcsdsFileSeqCountProvider(file_name: Path = PosixPath('seqcnt.txt')): Bases: FileSeqCountProvider

class spacepackets.seqcount.FileSeqCountProvider(max_bit_width: int, file_name: Path = PosixPath('seqcnt.txt'))

Bases: ProvidesSeqCount

Sequence count provider which uses a disk file to store the current sequence count in a non-volatile way. The first call with the next built-in or using the base class current() call will yield a 0

check_count(line: str) → int

create_new() → None

current() → int

get_and_increment() → int: Contract: Retrieve the current sequence count and then increment it. The first call should yield 0

property max_bit_width: int

class spacepackets.seqcount.ProvidesSeqCount

Bases: ABC

abstract get_and_increment() → int: Contract: Retrieve the current sequence count and then increment it. The first call should yield 0

abstract property max_bit_width: int

spacepackets.seqcount.PusFileSeqCountProvider: alias of CcsdsFileSeqCountProvider

class spacepackets.seqcount.SeqCountProvider(bit_width: int)

Bases: ProvidesSeqCount

get_and_increment() → int: Contract: Retrieve the current sequence count and then increment it. The first call should yield 0

property max_bit_width: int