EVOC PPC-1507, Manual

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Appendix
PPC­1507 ­ 31 ­
Appendix
Watchdog Programming Guide
EC4­1713CLDNA (B)­PPC includes a programmable watchdog timer
(WDT) up to 255 levels and time by minute or second. Watchdog timer
overtime event can be programmed to reset system or generate shielding
interrupts. (The interrupt here can not be shared and can not be the same
as interrupt of other devices within the system).
The following describes WDT program in C language; please refer to the
following demonstration code:
//Super I/O Watchdog
#define pm_base 0x0a00
#define WRITEREG(reg,val) {tmp_reg=reg;
outportb(tmp_reg,val);}
//1.Initial Watchdog device
short SIOWTD_Setup(short irq)
/* irq=3,4,5,6,7,9,12,0:disable interrupt,0xff:reset*/
{
//check parameters
//if(irq!=0xff && (irq<3 || irq>7) && irq!=9 && irq!=12 &&
irq!=0)
// return ­1;
SIOWTD_Disable();
//start programming Watchdog
//Set Watchdog Event