/////////////////////////////////////////////////////////////////////////
////                           EX_RTCLK.C                            ////
////                                                                 ////
////  This program reads and writes to an external Real Time Clock.  ////
////  It communicates to the user using the LCD and keypad.          ////
////                                                                 ////
////  Configure the CCS prototype card as follows:                   ////
////      Install the LCD and keypad.                                ////
/////////////////////////////////////////////////////////////////////////

#include <16C74.H>

#use delay(clock=4000000)

#define RTC_CE    PIN_D0
#define RTC_IO    PIN_D1
#define RTC_CLK   PIN_D2
#define RTC_DATA  PIN_D3

#include <ds1302.C>
#include <LCD.C>
#include <KBD.C>

byte get_bcd() {
  char first,second;

  do {
    first=kbd_getc();
  } while ((first<'0') || (first>'9'));
  lcd_putc(first);
  first-='0';

  do {
    second=kbd_getc();
  } while ((second<'0') || (second>'9'));
  lcd_putc(second);

  return((first<<4)|(second-'0'));
}

void set_clock(){
   byte day,mth,year,dow,hour,min;

   lcd_putc("\fYear 19: ");
   year=get_bcd();
   lcd_putc("\fMonth: ");
   mth=get_bcd();
   lcd_putc("\fDay: ");
   day=get_bcd();
   lcd_putc("\fWeekday 1-7: ");
   dow=get_bcd();
   lcd_putc("\fHour: ");
   hour=get_bcd();
   lcd_putc("\fMin: ");
   min=get_bcd();

   rtc_set_datetime(day,mth,year,dow,hour,min);
}


main() {
   char cmd;
   byte day,mth,year,dow,hour,min,sec;

   rtc_init();
   lcd_init();
   kbd_init();

   lcd_putc("\f1: Change, 2: Display");

   do {
      cmd=kbd_getc();
   } while ((cmd!='1')&&(cmd!='2'));

   if(cmd=='1')
     set_clock();

   while (TRUE) {
      lcd_putc('\f');
      rtc_get_date( day, mth, year, dow);
      rtc_get_time( hour, min, sec );
      printf(lcd_putc,"%2X/%2X/%2X\n%2X:%2X:%2X",day,mth,year,hour,min,sec);
      delay_ms(250);
   }
}