fsfw/tmtcpacket/pus/TmPacketBase.h

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#ifndef TMTCPACKET_PUS_TMPACKETBASE_H_
#define TMTCPACKET_PUS_TMPACKETBASE_H_
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#include "../SpacePacketBase.h"
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#include "../../timemanager/TimeStamperIF.h"
#include "../../timemanager/Clock.h"
#include "../../objectmanager/SystemObjectIF.h"
namespace Factory{
void setStaticFrameworkObjectIds();
}
/**
* This class is the basic data handler for any ECSS PUS Telemetry packet.
*
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* In addition to #SpacePacketBase, the class provides methods to handle
* the standardized entries of the PUS TM Packet Data Field Header.
* It does not contain the packet data itself but a pointer to the
* data must be set on instantiation. An invalid pointer may cause
* damage, as no getter method checks data validity. Anyway, a NULL
* check can be performed by making use of the getWholeData method.
* @ingroup tmtcpackets
*/
class TmPacketBase : public SpacePacketBase {
friend void (Factory::setStaticFrameworkObjectIds)();
public:
//! Maximum size of a TM Packet in this mission.
//! TODO: Make this dependant on a config variable.
static const uint32_t MISSION_TM_PACKET_MAX_SIZE = 2048;
//! First byte of secondary header for PUS-A packets.
//! TODO: Maybe also support PUS-C via config?
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static const uint8_t VERSION_NUMBER_BYTE = 0b00010000;
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/**
* This is the default constructor.
* It sets its internal data pointer to the address passed and also
* forwards the data pointer to the parent SpacePacketBase class.
* @param set_address The position where the packet data lies.
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*/
TmPacketBase( uint8_t* setData );
/**
* This is the empty default destructor.
*/
virtual ~TmPacketBase();
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/**
* This is a getter for the packet's PUS Service ID, which is the second
* byte of the Data Field Header.
* @return The packet's PUS Service ID.
*/
virtual uint8_t getService() = 0;
/**
* This is a getter for the packet's PUS Service Subtype, which is the
* third byte of the Data Field Header.
* @return The packet's PUS Service Subtype.
*/
virtual uint8_t getSubService() = 0;
/**
* This is a getter for a pointer to the packet's Source data.
*
* These are the bytes that follow after the Data Field Header. They form
* the packet's source data.
* @return A pointer to the PUS Source Data.
*/
virtual uint8_t* getSourceData() = 0;
/**
* This method calculates the size of the PUS Source data field.
*
* It takes the information stored in the CCSDS Packet Data Length field
* and subtracts the Data Field Header size and the CRC size.
* @return The size of the PUS Source Data (without Error Control field)
*/
virtual uint16_t getSourceDataSize() = 0;
/**
* Get size of data field which can differ based on implementation
* @return
*/
virtual uint16_t getDataFieldSize() = 0;
virtual size_t getPacketMinimumSize() const = 0;
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/**
* Interprets the "time"-field in the secondary header and returns it in
* timeval format.
* @return Converted timestamp of packet.
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*/
virtual ReturnValue_t getPacketTime(timeval* timestamp) const = 0;
/**
* Returns a raw pointer to the beginning of the time field.
* @return Raw pointer to time field.
*/
virtual uint8_t* getPacketTimeRaw() const = 0;
virtual size_t getTimestampSize() const = 0;
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/**
* This is a debugging helper method that prints the whole packet content
* to the screen.
*/
void print();
/**
* With this method, the Error Control Field is updated to match the
* current content of the packet. This method is not protected because
* a recalculation by the user might be necessary when manipulating fields
* like the sequence count.
*/
void setErrorControl();
/**
* This getter returns the Error Control Field of the packet.
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*
* The field is placed after any possible Source Data. If no
* Source Data is present there's still an Error Control field. It is
* supposed to be a 16bit-CRC.
* @return The PUS Error Control
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*/
uint16_t getErrorControl();
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protected:
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/**
* The timeStamper is responsible for adding a timestamp to the packet.
* It is initialized lazy.
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*/
static TimeStamperIF* timeStamper;
//! The ID to use when looking for a time stamper.
static object_id_t timeStamperId;
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/**
* Checks if a time stamper is available and tries to set it if not.
* @return Returns false if setting failed.
*/
bool checkAndSetStamper();
};
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#endif /* TMTCPACKET_PUS_TMPACKETBASE_H_ */