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time.h question

Started by Unknown ●November 13, 2004
Hi all,

 

Can anyone tell me why time.h states that we have 62 seconds in a minute?

 

typedef struct tm 

{

  int tm_sec;   // Seconds after the minute (0,61)

  int tm_min;   // Minutes after the hour (0,59)

  int tm_hour;  // hours since midnight (0,23)

  int tm_mday;  // day of the month (1,31)

  int tm_mon;   // moths since January (0,11)

  int tm_year;  // years since 1900

  int tm_wday;  // days since Sunday (0,6)

  int tm_yday;  // days since January 1 (0,365)

  int tm_isdst; // Daylight saving time flag 1= active 0= not active

};

 

And how should this be implemented?

Currently I thought like this:

void rtcService(void) __interrupt[TIMERA0_VECTOR]

{

  // check for overflows

  if(++RtcTime.tm_sec > 61)                   // Seconds after the minute
(0,61)

  {

    RtcTime.tm_sec = 0;

    if(++RtcTime.tm_min > 59)                 // Minutes after the hour
(0,59)

    {

      RtcTime.tm_min = 0;

      if(++RtcTime.tm_hour > 23)              // Hours since midnight
(0,23)

      {

        if(++RtcTime.tm_wday > 6)   RtcTime.tm_wday = 0; // Days since
Sunday (0,6)

        if(++RtcTime.tm_yday > 365) RtcTime.tm_yday = 0; // days since
january 1 (0, 365)

        if(++RtcTime.tm_mday > MonthDayTable[RtcTime.tm_mon-1]) // Day of
the month (1,31)

        {

          RtcTime.tm_mday = 1;

          if(++RtcTime.tm_mon > 11)            // months since Januari
(0,11)

          {

            RtcTime.tm_mon = 0;

            RtcTime.tm_year++;                 // Years since 1900

          }

        }

      }

    }

  } 

}// (jump back into the program)

 

But obviously this goes wrong. The thing is I need a unix like timer routine
for calculations

And I thought that time.c would be available on the web but so far no luck.
If then I could check this and find out what/why im thinking wrong

 

thanks martijn

Beginning Microcontrollers with the MSP430

Reply by Paul Curtis ●November 13, 20042004-11-13
Hi Martijn,

Try Googling for "leap seconds".  I've needed to use leap seconds
for
contracts where broadcasters get very uptight about time issues.

This is a good reference:

http://tycho.usno.navy.mil/leapsec.html

For those of you interested in time, the Standard C Date/Time Library
book is interesting, but has bugs.

http://www.amazon.com/exec/obidos/tg/detail/-/0879304960/102-5642561-486
1761?v=glance

--
Paul Curtis, Rowley Associates Ltd  http://www.rowley.co.uk
CrossWorks for MSP430, ARM, and (soon) Atmel AVR processors   

> -----Original Message-----
> From: martijnbroens@mart... [mailto:martijnbroens@mart...] 
> Sent: 13 November 2004 12:58
> To: msp430@msp4...
> Subject: [msp430] time.h question
> 
> 
> Hi all,
> 
>  
> 
> Can anyone tell me why time.h states that we have 62 seconds 
> in a minute?
> 
>  
> 
> typedef struct tm 
> 
> {
> 
>   int tm_sec;   // Seconds after the minute (0,61)
> 
>   int tm_min;   // Minutes after the hour (0,59)
> 
>   int tm_hour;  // hours since midnight (0,23)
> 
>   int tm_mday;  // day of the month (1,31)
> 
>   int tm_mon;   // moths since January (0,11)
> 
>   int tm_year;  // years since 1900
> 
>   int tm_wday;  // days since Sunday (0,6)
> 
>   int tm_yday;  // days since January 1 (0,365)
> 
>   int tm_isdst; // Daylight saving time flag 1= active 0= not active
> 
> };
> 
>  
> 
> And how should this be implemented?
> 
> Currently I thought like this:
> 
> void rtcService(void) __interrupt[TIMERA0_VECTOR]
> 
> {
> 
>   // check for overflows
> 
>   if(++RtcTime.tm_sec > 61)                   // Seconds 
> after the minute
> (0,61)
> 
>   {
> 
>     RtcTime.tm_sec = 0;
> 
>     if(++RtcTime.tm_min > 59)                 // Minutes 
> after the hour
> (0,59)
> 
>     {
> 
>       RtcTime.tm_min = 0;
> 
>       if(++RtcTime.tm_hour > 23)              // Hours since 
> midnight (0,23)
> 
>       {
> 
>         if(++RtcTime.tm_wday > 6)   RtcTime.tm_wday = 0; // Days
since
> Sunday (0,6)
> 
>         if(++RtcTime.tm_yday > 365) RtcTime.tm_yday = 0; // 
> days since january 1 (0, 365)
> 
>         if(++RtcTime.tm_mday > 
> MonthDayTable[RtcTime.tm_mon-1]) // Day of the month (1,31)
> 
>         {
> 
>           RtcTime.tm_mday = 1;
> 
>           if(++RtcTime.tm_mon > 11)            // months since
Januari
> (0,11)
> 
>           {
> 
>             RtcTime.tm_mon = 0;
> 
>             RtcTime.tm_year++;                 // Years since 1900
> 
>           }
> 
>         }
> 
>       }
> 
>     }
> 
>   } 
> 
> }// (jump back into the program)
> 
>  
> 
> But obviously this goes wrong. The thing is I need a unix 
> like timer routine for calculations
> 
> And I thought that time.c would be available on the web but 
> so far no luck.
> If then I could check this and find out what/why im thinking wrong
> 
>  
> 
> thanks martijn
> 
>  
> 
> 
> 
> 
> 
> 
> 
> ------------------------ Yahoo! Groups Sponsor 
> --------------------~-->
> $9.95 domain names from Yahoo!. Register anything.
> http://us.click.yahoo.com/J8kdrA/y20IAA/yQLSAA/CFFolB/TM
> --------------------------
> ------~-> 
> 
> .
> 
>  
> Yahoo! Groups Links
> 
> 
> 
>  
> 
> 
> 
> 
>
Reply by Martijn Broens ●November 13, 20042004-11-13
Hi Paul,

 

Thanks for the reply i'm  checking it

 

  _____  

From: Paul Curtis [mailto:plc@plc@...] 
Sent: zaterdag 13 november 2004 14:26
To: msp430@msp4...
Subject: RE: [msp430] time.h question

 

Hi Martijn,

Try Googling for "leap seconds".  I've needed to use leap seconds
for
contracts where broadcasters get very uptight about time issues.

This is a good reference:

http://tycho.usno.navy.mil/leapsec.html

For those of you interested in time, the Standard C Date/Time Library
book is interesting, but has bugs.

http://www.amazon.com/exec/obidos/tg/detail/-/0879304960/102-5642561-486
1761?v=glance

--
Paul Curtis, Rowley Associates Ltd  http://www.rowley.co.uk
CrossWorks for MSP430, ARM, and (soon) Atmel AVR processors   

> -----Original Message-----
> From: martijnbroens@mart... [mailto:martijnbroens@mart...] 
> Sent: 13 November 2004 12:58
> To: msp430@msp4...
> Subject: [msp430] time.h question
> 
> 
> Hi all,
> 
>  
> 
> Can anyone tell me why time.h states that we have 62 seconds 
> in a minute?
> 
>  
> 
> typedef struct tm 
> 
> {
> 
>   int tm_sec;   // Seconds after the minute (0,61)
> 
>   int tm_min;   // Minutes after the hour (0,59)
> 
>   int tm_hour;  // hours since midnight (0,23)
> 
>   int tm_mday;  // day of the month (1,31)
> 
>   int tm_mon;   // moths since January (0,11)
> 
>   int tm_year;  // years since 1900
> 
>   int tm_wday;  // days since Sunday (0,6)
> 
>   int tm_yday;  // days since January 1 (0,365)
> 
>   int tm_isdst; // Daylight saving time flag 1= active 0= not active
> 
> };
> 
>  
> 
> And how should this be implemented?
> 
> Currently I thought like this:
> 
> void rtcService(void) __interrupt[TIMERA0_VECTOR]
> 
> {
> 
>   // check for overflows
> 
>   if(++RtcTime.tm_sec > 61)                   // Seconds 
> after the minute
> (0,61)
> 
>   {
> 
>     RtcTime.tm_sec = 0;
> 
>     if(++RtcTime.tm_min > 59)                 // Minutes 
> after the hour
> (0,59)
> 
>     {
> 
>       RtcTime.tm_min = 0;
> 
>       if(++RtcTime.tm_hour > 23)              // Hours since 
> midnight (0,23)
> 
>       {
> 
>         if(++RtcTime.tm_wday > 6)   RtcTime.tm_wday = 0; // Days
since
> Sunday (0,6)
> 
>         if(++RtcTime.tm_yday > 365) RtcTime.tm_yday = 0; // 
> days since january 1 (0, 365)
> 
>         if(++RtcTime.tm_mday > 
> MonthDayTable[RtcTime.tm_mon-1]) // Day of the month (1,31)
> 
>         {
> 
>           RtcTime.tm_mday = 1;
> 
>           if(++RtcTime.tm_mon > 11)            // months since
Januari
> (0,11)
> 
>           {
> 
>             RtcTime.tm_mon = 0;
> 
>             RtcTime.tm_year++;                 // Years since 1900
> 
>           }
> 
>         }
> 
>       }
> 
>     }
> 
>   } 
> 
> }// (jump back into the program)
> 
>  
> 
> But obviously this goes wrong. The thing is I need a unix 
> like timer routine for calculations
> 
> And I thought that time.c would be available on the web but 
> so far no luck.
> If then I could check this and find out what/why im thinking wrong
> 
>  
> 
> thanks martijn
> 
>  
> 
> 
> 
> 
> 
> 
> 
> ------------------------ Yahoo! Groups Sponsor 
> --------------------~-->
> $9.95 domain names from Yahoo!. Register anything.
> http://us.click.yahoo.com/J8kdrA/y20IAA/yQLSAA/CFFolB/TM
> --------------------------
> ------~-> 
> 
> .
> 
>  
> >  Terms of Service.
Reply by Paul Curtis ●November 13, 20042004-11-13
Martijn,

Unless you *need* to use leap seconds, you can ignore them--60 seconds
to a minute, usually.  Most people can go through their entire lifetime
without every worrying about leap seconds.

I don't have my copy of the SCDTL book handy, but I'm pretty sure it
details leap seconds.

--
Paul Curtis, Rowley Associates Ltd  http://www.rowley.co.uk
CrossWorks for MSP430, ARM, and (soon) Atmel AVR processors   

> -----Original Message-----
> From: Martijn Broens [mailto:martijnbroens@mart...] 
> Sent: 13 November 2004 13:36
> To: msp430@msp4...
> Subject: RE: [msp430] time.h question
> 
> 
> Hi Paul,
> 
>  
> 
> Thanks for the reply i'm  checking it
> 
>  
> 
>   _____  
> 
> From: Paul Curtis [mailto:plc@plc@...]
> Sent: zaterdag 13 november 2004 14:26
> To: msp430@msp4...
> Subject: RE: [msp430] time.h question
> 
>  
> 
> Hi Martijn,
> 
> Try Googling for "leap seconds".  I've needed to use leap 
> seconds for contracts where broadcasters get very uptight 
> about time issues.
> 
> This is a good reference:
> 
> http://tycho.usno.navy.mil/leapsec.html
> 
> For those of you interested in time, the Standard C Date/Time 
> Library book is interesting, but has bugs.
> 
> http://www.amazon.com/exec/obidos/tg/detail/-/0879304960/102-5
> 642561-486
> 1761?v=glance
> 
> --
> Paul Curtis, Rowley Associates Ltd  http://www.rowley.co.uk
> CrossWorks for MSP430, ARM, and (soon) Atmel AVR processors   
> 
> > -----Original Message-----
> > From: martijnbroens@mart... [mailto:martijnbroens@mart...]
> > Sent: 13 November 2004 12:58
> > To: msp430@msp4...
> > Subject: [msp430] time.h question
> > 
> > 
> > Hi all,
> > 
> >  
> > 
> > Can anyone tell me why time.h states that we have 62 seconds in a 
> > minute?
> > 
> >  
> > 
> > typedef struct tm
> > 
> > {
> > 
> >   int tm_sec;   // Seconds after the minute (0,61)
> > 
> >   int tm_min;   // Minutes after the hour (0,59)
> > 
> >   int tm_hour;  // hours since midnight (0,23)
> > 
> >   int tm_mday;  // day of the month (1,31)
> > 
> >   int tm_mon;   // moths since January (0,11)
> > 
> >   int tm_year;  // years since 1900
> > 
> >   int tm_wday;  // days since Sunday (0,6)
> > 
> >   int tm_yday;  // days since January 1 (0,365)
> > 
> >   int tm_isdst; // Daylight saving time flag 1= active 0= not active
> > 
> > };
> > 
> >  
> > 
> > And how should this be implemented?
> > 
> > Currently I thought like this:
> > 
> > void rtcService(void) __interrupt[TIMERA0_VECTOR]
> > 
> > {
> > 
> >   // check for overflows
> > 
> >   if(++RtcTime.tm_sec > 61)                   // Seconds 
> > after the minute
> > (0,61)
> > 
> >   {
> > 
> >     RtcTime.tm_sec = 0;
> > 
> >     if(++RtcTime.tm_min > 59)                 // Minutes 
> > after the hour
> > (0,59)
> > 
> >     {
> > 
> >       RtcTime.tm_min = 0;
> > 
> >       if(++RtcTime.tm_hour > 23)              // Hours since 
> > midnight (0,23)
> > 
> >       {
> > 
> >         if(++RtcTime.tm_wday > 6)   RtcTime.tm_wday = 0; // 
> Days since
> > Sunday (0,6)
> > 
> >         if(++RtcTime.tm_yday > 365) RtcTime.tm_yday = 0; // 
> days since 
> > january 1 (0, 365)
> > 
> >         if(++RtcTime.tm_mday >
> > MonthDayTable[RtcTime.tm_mon-1]) // Day of the month (1,31)
> > 
> >         {
> > 
> >           RtcTime.tm_mday = 1;
> > 
> >           if(++RtcTime.tm_mon > 11)            // months 
> since Januari
> > (0,11)
> > 
> >           {
> > 
> >             RtcTime.tm_mon = 0;
> > 
> >             RtcTime.tm_year++;                 // Years since 1900
> > 
> >           }
> > 
> >         }
> > 
> >       }
> > 
> >     }
> > 
> >   }
> > 
> > }// (jump back into the program)
> > 
> >  
> > 
> > But obviously this goes wrong. The thing is I need a unix 
> like timer 
> > routine for calculations
> > 
> > And I thought that time.c would be available on the web but 
> so far no 
> > luck.
> > If then I could check this and find out what/why im thinking wrong
> > 
> >  
> > 
> > thanks martijn
> > 
> >  
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > ------------------------ Yahoo! Groups Sponsor 
> > --------------------~-->
> > $9.95 domain names from Yahoo!. Register anything.
> > http://us.click.yahoo.com/J8kdrA/y20IAA/yQLSAA/CFFolB/TM
> > --------------------------
> > ------~->
> > 
> > .
> > 
> >  
> > >  Terms of Service. 
> 
> 
> 
> 
> 
> 
> 
> ------------------------ Yahoo! Groups Sponsor 
> --------------------~-->
> $9.95 domain names from Yahoo!. Register anything.
> http://us.click.yahoo.com/J8kdrA/y20IAA/yQLSAA/CFFolB/TM
> --------------------------
> ------~-> 
> 
> .
> 
>  
> Yahoo! Groups Links
> 
> 
> 
>  
> 
> 
> 
> 
>
Reply by Martijn Broens ●November 13, 20042004-11-13
Paul thanks,

 

Here's what i wan't to do:

            Get time_1 T every stime I need it, roundup to minutes

MD5 hash it with some code

Delete some position in th MD5 string

And finally display the result on a 6 digit display.

 

But just to have my library working completely I'd like to implement the
time.h functions like 

Difftime, asctime. But as mentioned mainly to have it working.

 

 

  _____  

From: Paul Curtis [mailto:plc@plc@...] 
Sent: zaterdag 13 november 2004 14:40
To: msp430@msp4...
Subject: RE: [msp430] time.h question

 

Martijn,

Unless you *need* to use leap seconds, you can ignore them--60 seconds
to a minute, usually.  Most people can go through their entire lifetime
without every worrying about leap seconds.

I don't have my copy of the SCDTL book handy, but I'm pretty sure it
details leap seconds.

--
Paul Curtis, Rowley Associates Ltd  http://www.rowley.co.uk
CrossWorks for MSP430, ARM, and (soon) Atmel AVR processors   

> -----Original Message-----
> From: Martijn Broens [mailto:martijnbroens@mart...] 
> Sent: 13 November 2004 13:36
> To: msp430@msp4...
> Subject: RE: [msp430] time.h question
> 
> 
> Hi Paul,
> 
>  
> 
> Thanks for the reply i'm  checking it
> 
>  
> 
>   _____  
> 
> From: Paul Curtis [mailto:plc@plc@...]
> Sent: zaterdag 13 november 2004 14:26
> To: msp430@msp4...
> Subject: RE: [msp430] time.h question
> 
>  
> 
> Hi Martijn,
> 
> Try Googling for "leap seconds".  I've needed to use leap 
> seconds for contracts where broadcasters get very uptight 
> about time issues.
> 
> This is a good reference:
> 
> http://tycho.usno.navy.mil/leapsec.html
> 
> For those of you interested in time, the Standard C Date/Time 
> Library book is interesting, but has bugs.
> 
> http://www.amazon.com/exec/obidos/tg/detail/-/0879304960/102-5
> 642561-486
> 1761?v=glance
> 
> --
> Paul Curtis, Rowley Associates Ltd  http://www.rowley.co.uk
> CrossWorks for MSP430, ARM, and (soon) Atmel AVR processors   
> 
> > -----Original Message-----
> > From: martijnbroens@mart... [mailto:martijnbroens@mart...]
> > Sent: 13 November 2004 12:58
> > To: msp430@msp4...
> > Subject: [msp430] time.h question
> > 
> > 
> > Hi all,
> > 
> >  
> > 
> > Can anyone tell me why time.h states that we have 62 seconds in a 
> > minute?
> > 
> >  
> > 
> > typedef struct tm
> > 
> > {
> > 
> >   int tm_sec;   // Seconds after the minute (0,61)
> > 
> >   int tm_min;   // Minutes after the hour (0,59)
> > 
> >   int tm_hour;  // hours since midnight (0,23)
> > 
> >   int tm_mday;  // day of the month (1,31)
> > 
> >   int tm_mon;   // moths since January (0,11)
> > 
> >   int tm_year;  // years since 1900
> > 
> >   int tm_wday;  // days since Sunday (0,6)
> > 
> >   int tm_yday;  // days since January 1 (0,365)
> > 
> >   int tm_isdst; // Daylight saving time flag 1= active 0= not active
> > 
> > };
> > 
> >  
> > 
> > And how should this be implemented?
> > 
> > Currently I thought like this:
> > 
> > void rtcService(void) __interrupt[TIMERA0_VECTOR]
> > 
> > {
> > 
> >   // check for overflows
> > 
> >   if(++RtcTime.tm_sec > 61)                   // Seconds 
> > after the minute
> > (0,61)
> > 
> >   {
> > 
> >     RtcTime.tm_sec = 0;
> > 
> >     if(++RtcTime.tm_min > 59)                 // Minutes 
> > after the hour
> > (0,59)
> > 
> >     {
> > 
> >       RtcTime.tm_min = 0;
> > 
> >       if(++RtcTime.tm_hour > 23)              // Hours since 
> > midnight (0,23)
> > 
> >       {
> > 
> >         if(++RtcTime.tm_wday > 6)   RtcTime.tm_wday = 0; // 
> Days since
> > Sunday (0,6)
> > 
> >         if(++RtcTime.tm_yday > 365) RtcTime.tm_yday = 0; // 
> days since 
> > january 1 (0, 365)
> > 
> >         if(++RtcTime.tm_mday >
> > MonthDayTable[RtcTime.tm_mon-1]) // Day of the month (1,31)
> > 
> >         {
> > 
> >           RtcTime.tm_mday = 1;
> > 
> >           if(++RtcTime.tm_mon > 11)            // months 
> since Januari
> > (0,11)
> > 
> >           {
> > 
> >             RtcTime.tm_mon = 0;
> > 
> >             RtcTime.tm_year++;                 // Years since 1900
> > 
> >           }
> > 
> >         }
> > 
> >       }
> > 
> >     }
> > 
> >   }
> > 
> > }// (jump back into the program)
> > 
> >  
> > 
> > But obviously this goes wrong. The thing is I need a unix 
> like timer 
> > routine for calculations
> > 
> > And I thought that time.c would be available on the web but 
> so far no 
> > luck.
> > If then I could check this and find out what/why im thinking wrong
> > 
> >  
> > 
> > thanks martijn
> > 
> >  
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > ------------------------ Yahoo! Groups Sponsor 
> > --------------------~-->
> > $9.95 domain names from Yahoo!. Register anything.
> > http://us.click.yahoo.com/J8kdrA/y20IAA/yQLSAA/CFFolB/TM
> > --------------------------
> > ------~->
> > 
> > .
> > 
> >  
> > >  Terms of Service. 
> 
> 
> 
> 
> 
> 
> 
> ------------------------ Yahoo! Groups Sponsor 
> --------------------~-->
> $9.95 domain names from Yahoo!. Register anything.
> http://us.click.yahoo.com/J8kdrA/y20IAA/yQLSAA/CFFolB/TM
> --------------------------
> ------~-> 
> 
> .
> 
>  
> >  Terms of Service.
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