The file wdt.h doesn't support fancy stuff like WDIE (interrupt enable bit)
I hacked it as follows for the STS case. Note I set it up so the macro
fails if there is no WDIE bit defined. There is only one line added to the
wdt_enable() macro...
Usage (in my code...)
wdt_enable((WDTO_4S | WDT_IE));
Note, the need for double parenthesis. Should "value", below, be encased in
parenthesis so I don't need it in the calling code?
Note, shouldn't this be extended to allowing the user to "specify" if reset
behavior is enabled or not? I didn't make that change because it would
break prior use.. Maybe set up a flag to "disable" the WDE flag so the
default behavior is compatible?
------- wdt.h-----------
#ifdef WDIE
# define WDT_IE 0x10
# define _WDT_IE_MASK _BV(WDIE)
#else
# define _WDT_IE_MASK 0
#endif
#define wdt_enable(value) \
__asm__ __volatile__ ( \
"in __tmp_reg__,__SREG__" "\n\t" \
"cli" "\n\t" \
"wdr" "\n\t" \
"sts %0,%1" "\n\t" \
"out __SREG__,__tmp_reg__" "\n\t" \
"sts %0,%2" "\n\t" \
: /* no outputs */ \
: "M" (_SFR_MEM_ADDR(_WD_CONTROL_REG)), \
"r" (_BV(_WD_CHANGE_BIT) | _BV(WDE)), \
"r" ((uint8_t) ((value & 0x08 ? _WD_PS3_MASK : 0x00) | \
(value & 0x10 ? _WDT_IE_MASK:0x00) | \ <<<I ADDED THIS LINE>>>
_BV(WDE) | (value & 0x07)) ) \
: "r0" \
)
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