fsfw/timemanager/Clock.h
2020-12-20 15:32:03 +01:00

157 lines
5.0 KiB
C++

#ifndef FSFW_TIMEMANAGER_CLOCK_H_
#define FSFW_TIMEMANAGER_CLOCK_H_
#include "../returnvalues/HasReturnvaluesIF.h"
#include "../ipc/MutexHelper.h"
#include "../globalfunctions/timevalOperations.h"
#include <cstdint>
#ifndef WIN32
#include <sys/time.h>
#endif
//! Don't use these for time points, type is not large enough for UNIX epoch.
using dur_millis_t = uint32_t;
class Clock {
public:
typedef struct {
uint32_t year; //!< Year, A.D.
uint32_t month; //!< Month, 1 .. 12.
uint32_t day; //!< Day, 1 .. 31.
uint32_t hour; //!< Hour, 0 .. 23.
uint32_t minute; //!< Minute, 0 .. 59.
uint32_t second; //!< Second, 0 .. 59.
uint32_t usecond; //!< Microseconds, 0 .. 999999
} TimeOfDay_t;
/**
* This method returns the number of clock ticks per second.
* In RTEMS, this is typically 1000.
* @return The number of ticks.
*
* @deprecated, we should not worry about ticks, but only time
*/
static uint32_t getTicksPerSecond(void);
/**
* This system call sets the system time.
* To set the time, it uses a TimeOfDay_t struct.
* @param time The struct with the time settings to set.
* @return -@c RETURN_OK on success. Otherwise, the OS failure code
* is returned.
*/
static ReturnValue_t setClock(const TimeOfDay_t* time);
/**
* This system call sets the system time.
* To set the time, it uses a timeval struct.
* @param time The struct with the time settings to set.
* @return -@c RETURN_OK on success. Otherwise, the OS failure code is returned.
*/
static ReturnValue_t setClock(const timeval* time);
/**
* This system call returns the current system clock in timeval format.
* The timval format has the fields @c tv_sec with seconds and @c tv_usec with
* microseconds since an OS-defined epoch.
* @param time A pointer to a timeval struct where the current time is stored.
* @return @c RETURN_OK on success. Otherwise, the OS failure code is returned.
*/
static ReturnValue_t getClock_timeval(timeval* time);
/**
* Get the time since boot in a timeval struct
*
* @param[out] time A pointer to a timeval struct where the uptime is stored.
* @return @c RETURN_OK on success. Otherwise, the OS failure code is returned.
*
* @deprecated, I do not think this should be able to fail, use timeval getUptime()
*/
static ReturnValue_t getUptime(timeval* uptime);
static timeval getUptime();
/**
* Get the time since boot in milliseconds
*
* This value can overflow! Still, it can be used to calculate time intervalls
* between two calls up to 49 days by always using uint32_t in the calculation
*
* @param ms uptime in ms
* @return RETURN_OK on success. Otherwise, the OS failure code is returned.
*/
static ReturnValue_t getUptime(uint32_t* uptimeMs);
/**
* Returns the time in microseconds since an OS-defined epoch.
* The time is returned in a 64 bit unsigned integer.
* @param time A pointer to a 64 bit unisigned integer where the data is stored.
* @return \c RETURN_OK on success. Otherwise, the OS failure code is returned.
*/
static ReturnValue_t getClock_usecs(uint64_t* time);
/**
* Returns the time in a TimeOfDay_t struct.
* @param time A pointer to a TimeOfDay_t struct.
* @return \c RETURN_OK on success. Otherwise, the OS failure code is returned.
*/
static ReturnValue_t getDateAndTime(TimeOfDay_t* time);
/**
* Converts a time of day struct to POSIX seconds.
* @param time The time of day as input
* @param timeval The corresponding seconds since the epoch.
* @return \c RETURN_OK on success. Otherwise, the OS failure code is returned.
*/
static ReturnValue_t convertTimeOfDayToTimeval(const TimeOfDay_t* from,
timeval* to);
/**
* Converts a time represented as seconds and subseconds since unix epoch to days since J2000
*
* @param time seconds since unix epoch
* @param[out] JD2000 days since J2000
* @return \c RETURN_OK
*/
static ReturnValue_t convertTimevalToJD2000(timeval time, double* JD2000);
/**
* Calculates and adds the offset between UTC and TT
*
* Depends on the leap seconds to be set correctly.
*
* @param utc timeval, corresponding to UTC time
* @param[out] tt timeval, corresponding to Terrestial Time
* @return \c RETURN_OK on success, \c RETURN_FAILED if leapSeconds are not set
*/
static ReturnValue_t convertUTCToTT(timeval utc, timeval* tt);
/**
* Set the Leap Seconds since 1972
*
* @param leapSeconds_
* @return \c RETURN_OK on success. Otherwise, the OS failure code is returned.
*/
static ReturnValue_t setLeapSeconds(const uint16_t leapSeconds_);
/**
* Get the Leap Seconds since 1972
*
* Must be set before!
*
* @param[out] leapSeconds_
* @return \c RETURN_OK on success. Otherwise, the OS failure code is returned.
*/
static ReturnValue_t getLeapSeconds(uint16_t *leapSeconds_);
/**
* Function to check and create the Mutex for the clock
* @return \c RETURN_OK on success. Otherwise \c RETURN_FAILED if not able to create one
*/
static ReturnValue_t checkOrCreateClockMutex();
private:
static MutexIF* timeMutex;
static uint16_t leapSeconds;
};
#endif /* FSFW_TIMEMANAGER_CLOCK_H_ */