/* RTC_TST.C
 *
 * Dallas Real-Time Clock Example Program
 *
 * This program requires that the RUN.EXE firmware be installed.
 *
 */

#include <stdio.h>
#include <dos.h>
main()
{
	union REGS inregs, outregs;
	int month,date,yr,hr,min,sec, n;

	printf("Set time? (y/n): ");
	if(toupper(getch()) == 'Y')
	{
		printf("\nEnter date (mm/dd/yyyy): ");
		scanf("%x/%x/%x", &month, &date, &yr);

		inregs.h.ah = 5;                /* Function 05h (set date) */
		inregs.x.cx = yr;                       /* set year */
		inregs.h.dh = (unsigned char) month;    /* set month */
		inregs.h.dl = (unsigned char) date;     /* set date */
		int86(0x1A, &inregs, &outregs);


		printf("\n\nEnter time (hh:mm:ss): ");
		scanf("%x:%x:%x", &hr,&min,&sec);

		inregs.h.ah = 3;                /* Function 03h (set time)*/
		inregs.h.ch = (unsigned char) hr;       /* set hours */
		inregs.h.cl = (unsigned char) min;      /* set minutes */
		inregs.h.dh = (unsigned char) sec;      /* set seconds */
		int86(0x1A, &inregs, &outregs);
	}

	printf("\n\nCurrent time\n");

	for(;;)
	{
		inregs.h.ah =2; /* read time */
		int86(0x1A, &inregs, &outregs);

		printf("time=%02x:%02x:%02x ",
			outregs.h.ch, outregs.h.cl, outregs.h.dh);

		inregs.h.ah =4; /* read date */
		int86(0x1A, &inregs, &outregs);

		printf("date=%02x/%02x/%02x%02x\r",
			outregs.h.dh, outregs.h.dl, outregs.h.ch, outregs.h.cl);

		if (kbhit())
			break;
		for (n=0; n<0x1000; n++);
	}
	getch();
}