[Elphel-support] DateTimeOrignal TAG in EXIF

[Andrey Filippov]

Robbert,

Below is a snippet from the /etc/init.d/usb (sorry - it should be
moved to some other script) that runs at system boot time.  You can
use similar method (PHP extension function elphel_set_fpga_time() ):

 ...
begin "Setting time from NTP server"
 /usr/local/bin/sntpdate 2> /dev/null
 NTP_RESULT=$?
 if [ "$NTP_RESULT" = "0" ]; then
   sleep 1;
   echo -e "${OKPOS}${BRACKET}[ ${GOOD}`date`${BRACKET} ]${NORMAL}"
   information "Setting FPGA time from the system time"
   echo "<?php elphel_set_fpga_time(time()+0.0); ?>" | php -a -q > /dev/null
 else
   echo -e "${FAILPOS}${BRACKET}[ ${WARN}unavailable${BRACKET} ]${WARN}"
 fi

Next is that function implementation (
http://elphel.cvs.sourceforge.net/viewvc/elphel/elphel353-8.0/apps/php-5.2.9/ext/elphel/elphel_php.c?revision=1.2&view=markup
) :

 1995 //! set FPGA clock. Input parameter - (double) seconds (i.e.
from 01/01/1970)
 1996 //! This clock is used to timestamp each image
 1997 //! returns same time rounded to microseconds (as written to FPGA)
 1998 PHP_FUNCTION(elphel_set_fpga_time) {
 1999   unsigned long write_data[8]= {FRAMEPARS_SETFRAME,     0,
 2000                                 G_SECONDS,              0,
 2001                                 G_MICROSECONDS,         0,
 2002                                 FRAMEPARS_SETFPGATIME,  0};
 2003   double dtime;
 2004   long ltime_sec,ltime_usec;
 2005   if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "d",
&dtime) == FAILURE) {
 2006         RETURN_NULL();
 2007   }
 2008   ltime_sec=dtime;
 2009   ltime_usec=(dtime-ltime_sec)*1000000;
 2010   write_data[3]=ltime_sec;
 2011   write_data[5]=ltime_usec;
 2012
 2013   long rslt=write(ELPHEL_G(fd_fparmsall), write_data, sizeof(write_data));
 2014   if (rslt<0) RETURN_LONG(-errno);
 2015   dtime=ltime_usec;
 2016   dtime=ltime_sec+0.000001*dtime;
 2017   RETURN_DOUBLE(dtime);
 2018 }





Andrey


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