235 lines
6.8 KiB
C++
235 lines
6.8 KiB
C++
/*
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* CCSDSTimeHelper.h
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*
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* Created on: 22.03.2013
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* Author: tod
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*/
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#ifndef CCSDSTIME_H_
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#define CCSDSTIME_H_
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#include <framework/osal/OSAL.h>
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#include <framework/returnvalues/HasReturnvaluesIF.h>
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#include <stdint.h>
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bool operator<(const timeval& lhs, const timeval& rhs);
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bool operator==(const timeval& lhs, const timeval& rhs);
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/**
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* static helper class for CCSDS Time Code Formats
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*
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* as described in CCSDS 301.0-B-3
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*
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* Still work in progress thus TODO finishme
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*/
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class CCSDSTime: public HasReturnvaluesIF {
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public:
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/**
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* The Time code identifications, bits 4-6 in the P-Field
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*/
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enum TimeCodeIdentification {
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CCS = 0b101,
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CUC_LEVEL1 = 0b001,
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CUC_LEVEL2 = 0b010,
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CDS = 0b100,
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AGENCY_DEFINED = 0b110
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};
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static const uint8_t P_FIELD_CUC_6B_CCSDS = (CUC_LEVEL1 << 4) + (3 << 2)
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+ 2;
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static const uint8_t P_FIELD_CUC_6B_AGENCY = (CUC_LEVEL2 << 4) + (3 << 2)
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+ 2;
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/**
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* Struct for CDS day-segmented format.
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*/
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struct CDS_short {
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uint8_t pField;
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uint8_t dayMSB;
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uint8_t dayLSB;
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uint8_t msDay_hh;
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uint8_t msDay_h;
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uint8_t msDay_l;
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uint8_t msDay_ll;
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};
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/**
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* Struct for the CCS fromat in day of month variation with seconds resolution
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*/
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struct Ccs_seconds {
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uint8_t pField;
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uint8_t yearMSB;
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uint8_t yearLSB;
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uint8_t month;
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uint8_t day;
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uint8_t hour;
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uint8_t minute;
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uint8_t second;
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};
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/**
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* Struct for the CCS fromat in day of month variation with 10E-4 seconds resolution
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*/
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struct Ccs_mseconds {
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uint8_t pField;
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uint8_t yearMSB;
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uint8_t yearLSB;
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uint8_t month;
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uint8_t day;
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uint8_t hour;
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uint8_t minute;
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uint8_t second;
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uint8_t secondEminus2;
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uint8_t secondEminus4;
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};
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struct OBT_FLP {
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uint8_t pFiled;
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uint8_t seconds_hh;
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uint8_t seconds_h;
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uint8_t seconds_l;
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uint8_t seconds_ll;
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uint8_t subsecondsMSB;
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uint8_t subsecondsLSB;
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};
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struct TimevalLess {
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bool operator()(const timeval& lhs, const timeval& rhs) const {
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return (lhs < rhs);
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}
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};
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static const uint8_t INTERFACE_ID = CCSDS_TIME_HELPER_CLASS;
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static const ReturnValue_t UNSUPPORTED_TIME_FORMAT = MAKE_RETURN_CODE(0);
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static const ReturnValue_t NOT_ENOUGH_INFORMATION_FOR_TARGET_FORMAT =
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MAKE_RETURN_CODE(1);
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static const ReturnValue_t LENGTH_MISMATCH = MAKE_RETURN_CODE(2);
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static const ReturnValue_t INVALID_TIME_FORMAT = MAKE_RETURN_CODE(3);
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static const ReturnValue_t INVALID_DAY_OF_YEAR = MAKE_RETURN_CODE(4);
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static const ReturnValue_t TIME_DOES_NOT_FIT_FORMAT = MAKE_RETURN_CODE(5);
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/**
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* convert a TimeofDay struct to ccs with seconds resolution
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*
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* Assumes a valid TimeOfDay. TODO: maybe check it anyway?
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*
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* @param to pointer to a CCS struct
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* @param from pointer to a TimeOfDay Struct
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* @return
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* - @c RETURN_OK as it assumes a valid TimeOfDay
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*/
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static ReturnValue_t convertToCcsds(Ccs_seconds *to,
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TimeOfDay_t const *from);
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/**
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* Converts to CDS format from timeval.
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* @param to pointer to the CDS struct to generate
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* @param from pointer to a timeval struct which comprises a time of day since UNIX epoch.
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* @return
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* - @c RETURN_OK as it assumes a valid timeval.
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*/
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static ReturnValue_t convertToCcsds(CDS_short* to, timeval const *from);
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static ReturnValue_t convertToCcsds(OBT_FLP* to, timeval const *from);
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/**
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* convert a TimeofDay struct to ccs with 10E-3 seconds resolution
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*
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* Assumes a valid TimeOfDay. TODO: maybe check it anyway?
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*
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* The 10E-4 seconds in the CCS Struct are 0 as the TimeOfDay only has ms resolution
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*
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* @param to pointer to a CCS struct
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* @param from pointer to a TimeOfDay Struct
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* @return
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* - @c RETURN_OK as it assumes a valid TimeOfDay
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*/
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static ReturnValue_t convertToCcsds(Ccs_mseconds *to,
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TimeOfDay_t const *from);
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/**
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* TODO: can this be modified to recognize padding?
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* Tries to interpret a Level 1 CCSDS time code
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*
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* It assumes binary formats contain a valid P Field and recognizes the ASCII format
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* by the lack of one.
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*
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* @param to an empty TimeOfDay struct
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* @param from pointer to an CCSDS Time code
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* @param length length of the Time code
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* @return
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* - @c RETURN_OK if successful
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* - @c UNSUPPORTED_TIME_FORMAT if a (possibly valid) time code is not supported TODO: the missing codes should be implemented...
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* - @c LENGTH_MISMATCH if the length does not match the P Field
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* - @c INVALID_TIME_FORMAT if the format or a value is invalid
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*/
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static ReturnValue_t convertFromCcsds(TimeOfDay_t *to, uint8_t const *from,
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uint32_t length);
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/**
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* not implemented yet
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*
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* @param to
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* @param from
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* @return
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*/
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static ReturnValue_t convertFromCcsds(timeval *to, uint8_t const *from,
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uint32_t* foundLength, uint32_t maxLength);
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static ReturnValue_t convertFromCUC(TimeOfDay_t *to, uint8_t const *from,
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uint8_t length);
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static ReturnValue_t convertFromCUC(timeval *to, uint8_t const *from,
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uint32_t* foundLength, uint32_t maxLength);
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static ReturnValue_t convertFromCUC(timeval *to, uint8_t pField,
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uint8_t const *from, uint32_t* foundLength, uint32_t maxLength);
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static ReturnValue_t convertFromCCS(timeval *to, uint8_t const *from,
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uint32_t* foundLength, uint32_t maxLength);
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static ReturnValue_t convertFromCCS(timeval *to, uint8_t pField,
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uint8_t const *from, uint32_t* foundLength, uint32_t maxLength);
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static ReturnValue_t convertFromCDS(TimeOfDay_t *to, uint8_t const *from,
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uint8_t length);
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static ReturnValue_t convertFromCDS(timeval *to, uint8_t const *from,
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uint32_t* foundLength, uint32_t maxLength);
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static ReturnValue_t convertFromCCS(TimeOfDay_t *to, uint8_t const *from,
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uint32_t* foundLength, uint32_t maxLength);
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static ReturnValue_t convertFromASCII(TimeOfDay_t *to, uint8_t const *from,
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uint8_t length);
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static uint32_t subsecondsToMicroseconds(uint16_t subseconds);
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private:
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CCSDSTime();
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virtual ~CCSDSTime();
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/**
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* checks a ccs time struct for validity
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*
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* only checks year to second, subseconds must be checked elsewhere
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*
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* @param time pointer to an Ccs struct (should be cast to Ccs_seconds as subseconds are not checked. Cast is save as subseconds are at the end of the struct)
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* @return
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*/
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static ReturnValue_t checkCcs(Ccs_seconds *time);
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static const uint32_t SECONDS_PER_DAY = 24 * 60 * 60;
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static const uint32_t SECONDS_PER_NON_LEAP_YEAR = SECONDS_PER_DAY * 365;
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static const uint32_t DAYS_CCSDS_TO_UNIX_EPOCH = 4383; //!< Time difference between CCSDS and POSIX epoch. This is exact, because leap-seconds where not introduced before 1972.
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static const uint32_t SECONDS_CCSDS_TO_UNIX_EPOCH = DAYS_CCSDS_TO_UNIX_EPOCH
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* SECONDS_PER_DAY;
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/**
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* @param dayofYear
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* @param year
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* @param month
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* @param day
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*/
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static ReturnValue_t convertDaysOfYear(uint16_t dayofYear, uint16_t year,
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uint8_t *month, uint8_t *day);
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static bool isLeapYear(uint16_t year);
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static ReturnValue_t convertTimevalToTimeOfDay(TimeOfDay_t* to,
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timeval* from);
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};
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#endif /* CCSDSTIME_H_ */
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