Norco BPC-7971, Руководство пользователя

Страница: 72 / 76

ATX-6971 User's Manual
47
Appendix
Appendix 1
：
Watchdog Programming Guide
watchdog reference code
（
C
）
-----------------------------------------------------------------------------------------------------------------------------
Set the port to realize watchdog function. In C programming language, different functions
of Watchdog Timer can be realized by operating ports by writing data to corresponding ports.
Port specification
：
void main()
{
int indexp = 0x2e,datap = 0x2f;
unsigned char temp;
Outportb(indexp,0x87);
Outportb(indexp,0x87); //unlock
Outportb(indexp,0x2d);
temp = (unsigned char) inportb (datap);
temp &= 0xfe;
Outportb(indexp,0x2d);
Outportb(datap,temp); //set pin for watchdog
Outportb(indexp,0x07);
Outportb(datap,0x08);
Outportb(indexp,0x30);
Outportb(datap,0x01); //enable logical device
Outportb(indexp,0xf5);
Outportb(datap,0x00); //set second
Outportb(indexp,0xf6);
Outportb(datap,0x05); //set 5seconds
Outportb(indexp,0xf7);
Outportb(datap,0x00);
Outportb(indexp,0xaa); //lock
}
If system halted, the watchdog enables the system to reboot automatically.