On Wed, 28 Jan 2009 20:57:04 +0100
Vincent Trouilliez <vincent.trouill...@modulonet.fr>
wrote:
>Hello,
>
>I am using the __DATE__ constant, to display it on screen
>at power-up.
>the screen is a 4x20 LCD, and the string returned by
>__DATE__ is quite
>long: "MMM DD YYYY".
>
>Is there a way to select a different (shorter in my case)
>format, or is
>it cast in stone ?
>
>I downloaded the heavy GCC 4.3.3 PDF manual, and among 636
>pages, the
>only occurence of __DATE__ is in this sentence:
>
>"The definitions for __DATE__ and __TIME__ when
>respectively, the date
>and time of translation are not available (C90 6.8.8, C99
>6.10.8)."
>
>"not available" ?
>
>I thought maybe it's supplied by avr-libc then, but the
>manual for that
>doesn't has any, zero, mention of __DATE__
>
>So it must be a gift from the AVR port of GCC then, but
>where is it
>documented ?
>
>
>While I am at it, in the same vein, has anybody a trick to
>retrieve
>the program revision number from subversion, so I can
>display that too
>along with the compilation date ?
>
>TIA.
>
>Regards,
>
>
>--
>Vince
>
Hi,
You can use the following MACROS and functions to get the
values in integer format. You can then display the date and
time in whatever format you desire.
#define COMPILE_HOUR (((__TIME__[0]-'0')*10) +
(__TIME__[1]-'0'))
#define COMPILE_MINUTE (((__TIME__[3]-'0')*10) +
(__TIME__[4]-'0'))
#define COMPILE_SECOND (((__TIME__[6]-'0')*10) +
(__TIME__[7]-'0'))
unsigned char GetCompileHour(void)
{
unsigned char hour=COMPILE_HOUR;
return(hour);
}
unsigned char GetCompileMinute(void)
{
unsigned char minute=COMPILE_MINUTE;
return(minute);
}
unsigned char GetCompileSecond(void)
{
unsigned char second=COMPILE_SECOND;
return(second);
}
#define YEAR ((((__DATE__ [7]-'0')*10+(__DATE__
[8]-'0'))*10+(__DATE__ [9]-'0'))*10+(__DATE__ [10]-'0'))
/* Month: 0 - 11 */
#define MONTH (__DATE__ [2] == 'n' ? (__DATE__ [1] == 'a' ?
0 : 5) \
: __DATE__ [2] == 'b' ? 1 \
: __DATE__ [2] == 'r' ? (__DATE__ [0] == 'M'
? 2 : 3) \
: __DATE__ [2] == 'y' ? 4 \
: __DATE__ [2] == 'l' ? 6 \
: __DATE__ [2] == 'g' ? 7 \
: __DATE__ [2] == 'p' ? 8 \
: __DATE__ [2] == 't' ? 9 \
: __DATE__ [2] == 'v' ? 10 : 11)
#define DAY ((__DATE__ [4]==' ' ? 0 : __DATE__
[4]-'0')*10+(__DATE__[5]-'0'))
/********************************************************************\
* Return year in which this file was last compiled as an
unsigned
* integer.
\********************************************************************/
unsigned short GetCompileYear(void)
{
unsigned short year=YEAR;
return(year);
}
/********************************************************************\
* Return month in which this file was last compiled.
* (0-11 for Jan - Dec)
\********************************************************************/
unsigned char GetCompileMonth(void)
{
unsigned short month=MONTH;
return(month);
}
/********************************************************************\
* Return the day of the month in which this file was last
compiled
\********************************************************************/
unsigned char GetCompileDay(void)
{
unsigned short day=DAY;
return(day);
}
Regards
Anton Erasmus
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