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Watchdog fuse bit
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laborratte

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Joined: 27 Jul 2005
Posts: 262
Location: Berlin

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PostPosted: Sat Sep 10, 2016 1:33 pm    Post subject: Reply with quote

Hi Mark,

a $NOWD option would also change the timing, as you than have to move the _initmicro call after save & change of MCUSR (which is mandatory for watchdog changes as I understand the datasheets).

If you want to keep the timing for most users maybe a $YOU_CAN_CONFIG_WATCHDOG_IN_INITMICRO_BUT_WITH_CHANGED_TIMING option, which toggels the _initmicro call from actual position to the position O-Familiy suggest. Then the users with "huge memory, slow clock and always watchdog on" can config the watchdog at a early stage. All other get the fastest _initmicro as possible.

Maybe you find a better name for the option....
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albertsm

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Joined: 09 Apr 2004
Posts: 5056
Location: Holland

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PostPosted: Fri Sep 30, 2016 9:50 am    Post subject: Reply with quote

Hello O-Family

ok, i get the problem. when the fuse is set, the wd is always on. even while the compiler turns it off, it will not respond to that.
i moved the disabling of the WD before the init_micro call. please test it, it is in the SLA area.
the few extra cycles (depending on the chip) are nothing compared to the startup time of the oscillator so i that will not be a real problem.

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O-Family

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Joined: 23 May 2010
Posts: 182
Location: Japan

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PostPosted: Sun Oct 02, 2016 12:35 am    Post subject: Reply with quote

Hi Mark

Reports.
This problem was resolved in 2.0.8.0 of the SLA.
Modifications will be helpful.

Best regards
O-Family

Code:

$prog &HFF , &HF7 , &HC9 , &HFD                             'Fuse bytes. (WDTON = 0)

$regfile = "m2560def.dat"
$crystal = 16000000
$hwstack = 128
$swstack = 128
$framesize = 128

'$initmicro                                                  'It is solved by $initmicro.

   Waitms 20                                                'Unexpected latency. (If you exceed 16ms)

   Config Watchdog = 1024
   Reset Watchdog

   Config Portb.7 = Output                                  'Arduino Mega 2560 LED.

   Do
      Reset Watchdog
      Toggle Portb.7                                        'LED blink at 1-second intervals.
      Wait 1
   Loop


_init_micro:                                                'Solutions $initmicro.
   Config Watchdog = 1024
   Return

   End
 
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albertsm

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Joined: 09 Apr 2004
Posts: 5056
Location: Holland

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PostPosted: Thu Oct 06, 2016 10:05 am    Post subject: Reply with quote

thanks for testing and letting me know.
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