en el otro post,que respondi, en el codigo hay una funcion de conversion en bcd, es tomada de un ejemplo que trae el ccs (yo la modifique un poco) y es especificamente para el ds1302, mira este ejemplo :
EX_RTCLK.C ,que esta en la carpeta de ejemplos que trae el ccs....espero te sirva de ayuda..
Codigo:
/////////////////////////////////////////////////////////////////////////
//// 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. ////
//// ////
//// This example will work with the PCB, PCM and PCH compilers. ////
//// The following conditional compilation lines are used to ////
//// include a valid device for each compiler. Change the device, ////
//// clock and RS232 pins for your hardware if needed. ////
/////////////////////////////////////////////////////////////////////////
//// (C) Copyright 1996,2003 Custom Computer Services ////
//// This source code may only be used by licensed users of the CCS ////
//// C compiler. This source code may only be distributed to other ////
//// licensed users of the CCS C compiler. No other use, ////
//// reproduction or distribution is permitted without written ////
//// permission. Derivative programs created using this software ////
//// in object code form are not restricted in any way. ////
/////////////////////////////////////////////////////////////////////////
#if defined(__PCB__)
#include <16C56.h>
#fuses HS,NOWDT,NOPROTECT
#use delay(clock=20000000)
#elif defined(__PCM__)
#include <16F877.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=20000000)
#elif defined(__PCH__)
#include <18F452.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=20000000)
#endif
#define RTC_SCLK PIN_B1
#define RTC_RST PIN_B2
#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);
}
void 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
%2X:%2X:%2X",day,mth,year,hour,min,sec);
delay_ms(250);
}
}
saludos...
