Portwell AMDY-7002, User Manual

Page: 29 / 60

System Installation
AMDY-7002 User’s Manual 3-4
3.5 WDT Function
The working algorithm of the WDT function can be simply described as a counting
process. The Time-Out Interval can be set through software programming. The
availability of the time-out interval settings by software or hardware varies from
Boards to boards.
WDT Control Command Example
#include <stdio.h>
#include <conio.h>
#include <dos.h>
#define SIO_Port 0x2E
#define SIO_Port2 0x4E
#define GPIO_LDN 0x07
void Enter_IT872x_SIO() {
outportb(SIO_Port, 0x87);
outportb(SIO_Port, 0x01);
outportb(SIO_Port, 0x55);
outportb(SIO_Port, 0x55);
}
void Set_LDN(unsigned char LDN) {
outportb(SIO_Port, 0x07);
outportb(S1, LDN);
printf("LDN=%x\n", LDN);
}
void Set_Register(unsigned char offset, unsigned char value) {
outportb(SIO_Port, offset);
outportb(S1, value);
printf("Write offset:%x = %x\n", offset, value);
}
int main(void) {
printf("test string\n");
Enter_IT872x_SIO();
Set_LDN(GPIO_LDN);
Set_Register(0x72, 0xC0);
Set_Register(0x73, 0x05);
printf("System will reset in 5 seconds\n");
return 0;
}