Appendix B - Watchdog Sample Code; Watchdog Timer - DFI EC200 Series User Manual

Appendix B - Watchdog Timer

Watchdog Timer

The following parameters are references for setting the time interval of the
Watchdog Timer function. The system will regularly be "cleared" according to the
set time interval. If the system hangs or fails to function, it will also reset ac-
cording to the time interval so that your system will continue to operate.
.model small
.386
;-------------------
;Port defi nation
;-------------------
SuperIo_CFG_Port EQU
SuperIo_DAT_Port EQU
WDT_Counter EQU
mSuperio_Enter_Confi g
mov dx, SuperIo_CFG_Port
mov al, 87h
out dx, al
NEWIODELAY
out dx, al
endM
mSuperio_Exit_Confi g
mov dx, SuperIo_CFG_Port
mov al, 0AAh
out dx, al
endM
mSuperio_GetSet_Reg
mov dx, SuperIo_CFG_Port
mov al, RegIndex
out dx, al
NEWIODELAY
mov dx, SuperIo_DAT_Port
in al, dx
NEWIODELAY
mov ah, al
and al, AndMask
or
out dx, al
NEWIODELAY
endM
mSuperio_Get_Reg Macro RegIndex
mov dx, SuperIo_CFG_Port
mov al, RegIndex
out dx, al
2Eh ;Super I/O Confi g port. (2Eh/4Eh)
SuperIo_CFG_Port + 1
10 ; 1 to 255 (Sec./Min), 0 means disabled
Macro
Macro
Macro RegIndex, AndMask, OrValue
al, OrValue
Watchdog Timer
B
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