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XenuIsWatching

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Posts posted by XenuIsWatching

  1. ok, after trying out time.h, i realized that my computer is sending the time to the MSP430, which isn't something that I want. I need the MSP430 to independently keep track of time. I have a keypad and character LCD screen that can be used to input the current time when the msp is powered on. Is there anyway to write to time_t and just increment it every second.

  2. Use the functions in time.h

     

    #include "time.h"
    
    const time_t time = 1234;	// Time in seconds
    
    struct tm *lt = localtime(&time);	// Convert to date & time for local time zone
    
    

     

    your "const time_t time = 1234; // Time in seconds" doesn't work

     

    It says "Severity and Description Path Resource Location Creation Time Id

    declaration is incompatible with "time_t time(time_t *)" (declared at line 61 of "C:/Program Files (x86)/Texas Instruments/ccsv4/tools/compiler/msp430/include/time.h")"

  3. struct tm bt;
    bt.tm_hour = 12;	// Hour
    bt.tm_min = 0;		// Minute
    bt.tm_sec = 0;		// Second
    bt.tm_mon = 7;		// Month
    bt.tm_mday = 17;	// Day
    bt.tm_year = 2011;	// Year
    bt.tm_isdst = 0;	// DST
    bt.tm_wday = 0;		// Day of week
    bt.tm_yday = 0;		// Day of year
    
    time_t seconds = mktime(&bt);  // Convert time/date to seconds
    

     

    ok, sorry, but I'm new the C language, but what does the bt. and struct tm bt mean?

    Is time_t unix time?

     

    I found the header file in CSS.

     

    /*****************************************************************************/
    /* time.h     v5.2.10                                                         */
    /* Copyright (c) 1990-2011  Texas Instruments Incorporated                   */
    /*****************************************************************************/
    
    #ifndef _TIME
    #define _TIME
    
    #include 
    
    
     #define CLOCKS_PER_SEC 1000
    
    #ifndef NULL
    #define NULL      0
    #endif
    
    #ifdef __cplusplus
    extern "C" namespace std {
    #endif
    
    typedef unsigned long clock_t;
    typedef unsigned long time_t;
    
    #ifndef _SIZE_T
    #define _SIZE_T
    typedef __SIZE_T_TYPE__ size_t;
    #endif
    
    struct tm 
    {
       int tm_sec;      /* seconds after the minute   - [0,59]  */
       int tm_min;      /* minutes after the hour     - [0,59]  */
       int tm_hour;     /* hours after the midnight   - [0,23]  */
       int tm_mday;     /* day of the month           - [1,31]  */
       int tm_mon;      /* months since January       - [0,11]  */
       int tm_year;     /* years since 1900                     */
       int tm_wday;     /* days since Sunday          - [0,6]   */
       int tm_yday;     /* days since Jan 1st         - [0,365] */
       int tm_isdst;    /* Daylight Savings Time flag           */
    
    };
    
    /*************************************************************************/
    /* TIME ZONE STRUCTURE DEFINITION                                        */
    /*************************************************************************/
    typedef struct 
    {
       short daylight;
       long  timezone;
       char  tzname[4];
       char  dstname[4];
    } TZ;
    
    extern _DATA_ACCESS TZ _tz;
    
    /****************************************************************************/
    /* FUNCTION DECLARATIONS.  (NOTE : clock AND time ARE SYSTEM SPECIFIC)      */
    /****************************************************************************/
    _CODE_ACCESS clock_t    clock(void);             
    _CODE_ACCESS time_t     time(time_t *_timer);   
    
    _CODE_ACCESS time_t     mktime(struct tm *_tptr);
    _CODE_ACCESS double     difftime(time_t _time1, time_t _time0);
         _IDECL char      *ctime(const time_t *_timer);
    _CODE_ACCESS char      *asctime(const struct tm *_timeptr);
    _CODE_ACCESS struct tm *gmtime(const time_t *_timer);
    _CODE_ACCESS struct tm *localtime(const time_t *_timer);
    _CODE_ACCESS size_t     strftime(char *_out, size_t _maxsize, 
    			 const char *_format,
    			 const struct tm *_timeptr);
    
    #if defined(_INLINE) || defined(_CTIME_IMPLEMENTATION)
    
    _IDEFN char *ctime(const time_t *timer)
    {
      return(asctime(localtime(timer)));
    }
    
    #endif /* _INLINE || _CTIME_IMPLEMENTATION */
    
    #ifdef __cplusplus
    } /* extern "C" */
    #endif /* __cplusplus */
    
    #endif /* _TIME */
    
    #if defined(__cplusplus) && !defined(_CPP_STYLE_HEADER)
    using std::clock_t;
    using std::time_t;
    using std::size_t;
    using std::tm;
    using std::TZ;
    using std::_tz;
    using std::clock;
    using std::time;
    using std::mktime;
    using std::difftime;
    using std::ctime;
    using std::asctime;
    using std::gmtime;
    using std::localtime;
    using std::strftime;
    #endif /* ! _CPP_STYLE_HEADER */
    
    

  4. I see how time.h can turn unix time to local time, but can it do local time to unix time, where send it the day year min hours etc.. and it returns the unix time.

     

    This is how how I count seconds using the 32.768kHz ACLK. Timer B is set up to trigger an interrupt every 1 second and it increments the unix timer. I have a gui that the user will enter the current local time in and the microprocessor would convert it to unix time to make triggering timed events easier.

     

    I already know the easy part of find the current seconds of the day just by doing the code below:

    seconds = UTC_count % 60;

     

    It counts seconds using the code below:

    //variable declaration
    unsigned long UTC_Count=0;
    
    //Timer B Interrupt Routine
    {
    UTC_Count++;
    return;
    }

  5. I'm trying to figure out to convert UTC time, which the time in seconds since midnight January 1, 1970, to calendar time and vice versa, but I can't quite figure out the algorithm. I'm using an MSP430F149 with a 32.768kHz ACLK to count seconds.

     

    I'm sure someone has figured this out before. Know where I can find it?

     

    edit: When i say calendar time i mean in this format: Year, Month, Day of the week, date, hour, minutes, seconds.

  6. Anyone know where i can find an example of someone using timer A capture on an MSP430.

     

    I'm trying to count the frequency of a flow meter. By know the frequency of the square wave it's outputting, I can determine the speed of the water.

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