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| #include <dos.h>
#include <ctype.h>
#include <stdio.h>
#include <conio.h>
#include <string.h>
#include <stdlib.h>
void interrupt far (*old4A)(void);
void interrupt far new4A(void);
void disable_update(void);
void enable_update(void);
int BCDToInteger(int bcd);
unsigned char IntToBCD(int value);
void get_Time(void);
void set_Time(void);
void wait(void);
void Set_Alarm(void);
void main()
{
char c, value;
clrscr();
printf("1 - Show time\n2 - Set time\n3 - Set alarm\nEsc - Exit\n");
old4A = getvect(0x4A);
setvect(0x4A, new4A);
while(c != 27)
{
c = getch();
switch(c)
{
case '1': get_Time(); break;
case '2': set_Time(); break;
case '3': Set_Alarm(); break;
case 27: break;
}
}
setvect(0x4A, old4A);
}
void interrupt far new4A(void)
{ short value;
char port61;
old4A();
printf("Alarm!!!");
outp(0x43, 0xB6);
value = 1193180/850;
outp(0x42, (char)value);
outp(0x42, (char)(value >> 8));
port61 = inp(0x61);
port61 |= 3;
outp(0x61, port61);
delay(1000);
port61 &= 0xFFFC;
outp(0x61, port61);
outp(0x20,0x20);
}
void Set_Alarm(void)
{
int value;
disable_update(); // disable clock update
printf("Enter hour: "); scanf("%d", &value);
outp(0x70, 0x05);
outp(0x71, IntToBCD(value));
printf("Enter minute: "); scanf("%d", &value);
outp(0x70, 0x03);
outp(0x71, IntToBCD(value));
printf("Enter second: "); scanf("%d", &value);
outp(0x70, 0x01);
outp(0x71, IntToBCD(value));
enable_update(); // enable clock update
printf("Alarm is set... Complete!\n");
}
void wait(void) //waiting clock, if 7th bit==1, clock busy
{
do
{outp(0x70, 0x0A);
}while( inp(0x71) & 0x80 );
}
void get_Time(void)
{
unsigned char value;
wait();
outp(0x70, 0x04); //hour
value = inp(0x71); printf("%d:",BCDToInteger(value)); wait();
outp(0x70, 0x02); // minute
value = inp(0x71); printf("%d:",BCDToInteger(value)); wait();
outp(0x70, 0x00); // second
value = inp(0x71); printf("%d ",BCDToInteger(value)); wait();
outp(0x70, 0x07); // day of month
value = inp(0x71); printf("%d.",BCDToInteger(value)); wait();
outp(0x70, 0x08); // month
value = inp(0x71); printf("%d.",BCDToInteger(value)); wait();
outp(0x70, 0x09); // year
value = inp(0x71); printf("%d ",BCDToInteger(value)); wait();
outp(0x70, 0x06); // day of week
value = inp(0x71);
switch(BCDToInteger(value))
{
case 2: printf("Monday\n"); break;
case 3: printf("Tuesday\n"); break;
case 4: printf("Wednesday\n"); break;
case 5: printf("Thursday\n"); break;
case 6: printf("Friday\n"); break;
case 7: printf("Saturday\n"); break;
case 1: printf("Sunday\n"); break;
default: printf("Day of week isn't set\n"); break;
}
}
void set_Time(void)
{
int value;
disable_update(); // disable clock update
printf("Enter hour: "); scanf("%d", &value);
outp(0x70, 0x04);
outp(0x71, IntToBCD(value));
printf("Enter minute: "); scanf("%d", &value);
outp(0x70, 0x02);
outp(0x71, IntToBCD(value));
printf("Enter second: "); scanf("%d", &value);
outp(0x70, 0x00);
outp(0x71, IntToBCD(value));
printf("Enter week day number: "); scanf("%d", &value);
outp(0x70, 0x06);
outp(0x71, IntToBCD(value));
printf("Enter day of month: "); scanf("%d", &value);
outp(0x70, 0x07);
outp(0x71, IntToBCD(value));
printf("Enter month: "); scanf("%d", &value);
outp(0x70, 0x08);
outp(0x71, IntToBCD(value));
printf("Enter year: "); scanf("%d", &value);
outp(0x70, 0x09);
outp(0x71, IntToBCD(value));
enable_update(); // enable clock update
printf("Time is set... Complete!\n");
}
void disable_update(void) // disable update
{
unsigned char value;
wait();
outp(0x70,0x0B);
value = inp(0x71);
value|=0x80; //set 1 in 7th bit
outp(0x70, 0x0B);
outp(0x71, value);
printf("TIme update was disabled\n");
}
void enable_update(void) //enable update
{
unsigned char value;
wait();
outp(0x70,0x0B);
value = inp(0x71);
value-=0x80; //set 0 to 7th bit
outp(0x70, 0x0B);
outp(0x71, value);
printf("Time update was enabled\n");
}
int BCDToInteger (int bcd)
{
return bcd % 16 + bcd / 16 * 10;
}
unsigned char IntToBCD (int value)
{
return (unsigned char)((value/10)<<4)|(value%10);
} |
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