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# CCSDSpy

---

CCSDSpy is a library to read a data packet coming from a space mission that follows the Consultative Committee for Space Data Systems (CCSDS) standard

Current version **0.1.0**

Installation

Usage

[[_TOC_]]

## Installation

## Usage

```python

from CCSDS import CCSDS

```

wehre *packet* is a string with the HEX rappresentation of the pachet

Limitation

## Limitation

## Data Structure

The CCSDS Header is composed by two blocks 

The CCSDS Header is composed by two blocks:

+ the Source Packet Header 

+ the Packet Data Field

The first one il long 48 bits the second one has a varble dimension and structure depending by the type and the content of the packet. in [Figure 1](#figure-1-telemetry-packet) is reported the structure for a Telemetry Packet.

The structure of the CCSDS class follow the structure of the packet header.

```mermaid

classDiagram

    CCSDS --|> SPH

    CCSDS --|> PDF

    SPH --|> packetID

    SPH--|> sequenceControl

    PDF --|> DFHeader

    class CCSDS{

        + str Data 

    }

    class DFHeader{

        + uint PUSVersion

        + uint ServiceType

        + uint ServiceSubType

        + uint DestinationId

        + uint Synchronization

        + uint CorseTime

        + uint FineTime

        + str SCET

        + str  UTCTime

    }

    class SPH{

        + uint packetLength

    }

    class packetID{

        + uint VersionNum

        + uint packetType

        + uint dataFieldHeaderFlag 

        + uint Apid

        + uint Pid

        + uint Pcat

    }

    class sequenceControl{

        + bin SegmentationFlag

        + uint SSC

    }

    class PDF{

        +str Data

    }

```

![TM packet](docs/TM_Packet_H_eader.png)

![TM packet](docs/TM_Packet_Header.png "Telemetry packet")

####Figure 1 - Telemetry Packet

from bitstring import BitStream

import spiceypy as spice

# Versio 0.1.0

class PacketId:

    def __init__(self,data):