powerpc mvme5500 clock off by factor of 150

[Joel Sherrill <joel@OARcorp.com>]

Kate Feng wrote:
> Peter Dufault wrote:
> 
> 
>>The clock on the MVME5500 seems to be off by a factor of 150.  In the
>>"ticker" test it is taking 750 seconds instead of 5 seconds for the
>>displays of the times.  I started fiddling constants in bspstart.c but
>>then reading the I2C bus started to fail so I decided I had to look
>>through things and get an overview and not continue ignorantly.
>>
>>I'm looking through it now, but if anyone has hints based on knowledge
>>of the PPC decrementer and the PPC board support packages and how they
>>support the clock (or maybe changes that went into 4.7?) on where I
>>should look I'd appreciate it.
>>
> 
> 
> I  never tested the tests/samples/ticker.  However, the mvme5500 clock
> works fine for me.  Attached is a test program I  wrote.  The test result
> is:

This is using rtems_bsp_delay.  This is not the same as the
ticker test which uses that the clock tick device driver.
Look in tests/samples/ticker.  You need to run it or
you can't be sure any RTEMS time related service including
timeouts on blocking, sleep, etc are right.

--joel


> Cexp>test_ticker()
> 
> 
> *** Ticker TEST ***
> Ticks per second 100.000000
>  - rtems_clock_get - 09:00:00   03/07/2005
>  - rtems_clock_get - 09:00:01   03/07/2005
>  - rtems_clock_get - 09:00:02   03/07/2005
>  - rtems_clock_get - 09:00:03   03/07/2005
>  - rtems_clock_get - 09:00:04   03/07/2005
>  - rtems_clock_get - 09:00:05   03/07/2005
>  - rtems_clock_get - 09:00:06   03/07/2005
>  - rtems_clock_get - 09:00:07   03/07/2005
>  - rtems_clock_get - 09:00:08   03/07/2005
>  - rtems_clock_get - 09:00:09   03/07/2005
> 
> 
> Reagrds,
> Kate
> 
> 
> 
> ------------------------------------------------------------------------
> 
> /*
>  *  Simple test program -- simplified version of sample test hello.
>  */
> 
> #include <bsp.h>
> 
> #include <stdio.h>
> /*
>  * ANSI C
>  */
> #include <time.h>
> #include <limits.h>
> 
> /*
>  * RTEMS
>  */
> #include <libcpu/io.h>
> #include <rtems.h>
> #include <rtems/rtems_bsdnet.h>
> #include <bsp.h>
> 
> #define print_time(_s1, _tb, _s2) \
>   do { \
>     printf( "%s%02d:%02d:%02d   %02d/%02d/%04d%s", \
>        _s1, (_tb)->hour, (_tb)->minute, (_tb)->second, \
>        (_tb)->month, (_tb)->day, (_tb)->year, _s2 ); \
>     fflush(stdout); \
>   } while ( 0 )
> 
> 
> void test_ticker()
> {
>   rtems_interval rtemsTicksPerSecond;
>   double rtemsTicksPerSecond_double;
>   int i;
>   rtems_status_code sc;
>   rtems_time_of_day time;
> 
> 
>   printf( "\n\n*** Ticker TEST ***\n" );
>   rtems_clock_get(RTEMS_CLOCK_GET_TICKS_PER_SECOND, &rtemsTicksPerSecond);
>   rtemsTicksPerSecond_double = rtemsTicksPerSecond;
>   printf("Ticks per second %lf\n", rtemsTicksPerSecond_double);
>   time.year = 2005;
>   time.month = 3;
>   time.day = 7;
>   time.hour = 9;
>   time.minute = 0;
>   time.second = 0;
>   time.ticks = 0;
>   if ((sc = rtems_clock_set (&time)) != RTEMS_SUCCESSFUL)
>      printf ("***** Can't set time: %s\n", rtems_status_text (sc));
> 
> 
>   for (i=0; i<10; i++) {
>      rtems_bsp_delay(1000000); /* delay 1 second */
> 
>      sc = rtems_clock_get (RTEMS_CLOCK_GET_TOD, &time);
>      if (sc == RTEMS_SUCCESSFUL) {
>         print_time( " - rtems_clock_get - ", &time, "\n" );
>      }
>      else
>         printf("rtems_clock_get failed %d\n", sc); 
>   }
> }


-- 
Joel Sherrill, Ph.D.             Director of Research & Development
joel at OARcorp.com                 On-Line Applications Research
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