[En-Nut-Discussion] Watchdog problems with v4411 on SAM7X256-ek
harald.kipp at egnite.de
Fri Aug 29 09:53:49 CEST 2008
ennut at thezachariasgroup.com wrote:
> I commented out the following code as shown:
> * The watchdog is enabled after processor reset. Disable it.
> ldr r1, =WDT_BASE
> ldr r0, =WDT_WDDIS
> str r0, [r1, #WDT_MR_OFF]
Arrrgh! That was too obvious. I received several requests about non
working watchdogs on the SAM, but never had enough time to evaluate this.
Indeed the problem is, that the watchdog on some CPUs is activated on
reset. If disabled, it can't be enabled again. IMHO, this paranoid
design is "krank" (http://dict.leo.org/).
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