WinSystems SYS-ITX-N-3800, Руководство по эксплуатации продукта

Страница: 11 / 37

SYS-ITX-N-3800/Setup
v1.0 www.winsystems.com Page 11
7.4.1 Example Code for WDT
The SYS-ITX-N-3800 features a programmable WDT. The following WDT
code example is written in C++. Use this example as a guide to program
the WDT.
#include <stdio.h>
#include <stdlib.h>
#include <conio.h>
#include <dos.h>
#define EC_DATA 0x62
#define EC_CMD 0x66
#define EC_CMD_READ 0x80
#define EC_CMD_WRITE 0x81
#define WDT_MODE 0x06 // WDT Select mode.
#define WDT_MIN 0x07 // Minute mode counter
#define WDT_SEC 0x08 // Second mode counter
// Use port 62 and port 66 to access EC command / data.
static int IBF_Check()
{
unsigned char IBF_status;
do
{
pw_udelay (20); // delay 20 us
IBF_status = inportb (EC_CMD);
} while (IBF_status & 0x02);
return 1;
}
static int OBF_Check ()
{
unsigned char OBF_status;
do
{
pw_udelay (20); // delay 20 us
OBP_status = inportb (EC_CMD);
} while (!(OBF_status & 0x01));
return 1;
}
static void Write_EC (unsigned char index, unsigned char data)
{
IBF_Check ();
outportb (EC_CMD, EC_CMD_WRITE);
IBF_Check ();
outportb (EC_DATA, index);
IBF_Check ();
outportb (EC_DATA, data);
}