RTC Revision as of 11:33, 10 January 2015 by Explorer (Talk | contribs) (diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)

RTC

RTC_Init

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Defination	void RTC_Init()
Input Arguments	none
Return Value	none
Description	This function is used to Initialize the Ds1307 RTC.
Usage	RTC_Init();

RTC_SetTime

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Defination	void RTC_SetTime(uint8_t var_hour_u8, uint8_t var_min_u8, uint8_t var_sec_u8)
Input Arguments	uint8_t: Hour (0x00-0x23) BCD format uint8_t: Minute (0x00-0x59) BCD format uint8_t: Second (0x00-0x59) BCD format
Return Value	none
Description	This function is used to update the Time(hh,mm,ss) of Ds1307 RTC. The new time is updated into the non volatile memory of Ds1307. Note: The I/P arguments should of BCD, like 0x12,0x39,0x26 for 12hr,39min and 26sec.
Usage	RTC_SetTime(0x10,0x40,0x20); //All the arguments should be in BCD format

RTC_SetDate

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Defination	void RTC_SetDate(uint8_t var_day_u8, uint8_t var_month_u8, uint8_t var_year_u8)
Input Arguments	uint8_t: Day(0x01-0x31) BCD format uint8_t: Month(0x01-12) BCD format uint8_t: Year(0x00-0x99) BCD format
Return Value	none
Description	This function is used to set Date(dd,mm,yy) into the Ds1307 RTC. The new Date is updated into the non volatile memory of Ds1307. Note: The I/P arguments should of BCD. Like 0x15,0x08,0x47 for 15th day,8th month and 47th year.
Usage	RTC_SetDate(0x15,0x08,0x47); //All arguments should be in BCD format.

RTC_GetTime

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Defination	void RTC_GetTime(uint8_t *ptr_hour_u8,uint8_t *ptr_min_u8,uint8_t *ptr_sec_u8)
Input Arguments	uint8_t *: Address to copy Hour. uint8_t *: Address to copy Minute. uint8_t *: Address to copy Second.
Return Value	none
Description	This function is used to get the Time(hh,mm,ss) from Ds1307 RTC. Note: The time read from Ds1307 will be of BCD format, like 0x12,0x39,0x26 for 12hr,39min and 26sec.
Usage	uint8_t hour,min,sec; RTC_GetTime(&hour,&min&sec); //Now the hour,min,sec will have the time in BCD format.

RTC_GetDate

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Defination	void RTC_GetDate(uint8_t *ptr_day_u8,uint8_t *ptr_month_u8,uint8_t *ptr_year_u8)
Input Arguments	uint8_t * : Address to copy Day. uint8_t * : Address to copy Month. uint8_t * : Address to copy Year.
Return Value	none
Description	This function is used to get the Date(d,m,y) from Ds1307 RTC. Note: The date read from Ds1307 will be of BCD format, like 0x15,0x08,0x47 for 15th day,8th month and 47th year.
Usage	uint8_t hour,min,year; RTC_GetDate(&hour,&min&year); //Now the hour,min,year will have the Date in BCD format.

User Guide

/*** Program to demonstrate the  RTC library */
#include "uart.h"	//User defined UART library which contains the UART routines
#include "rtc.h"    //User defined library which contains the RTC(ds1307) routines
 
 
void main() 
{
   unsigned char sec,min,hour,day,month,year;
 
 
    UART_Init(9600); /* Initialize the Uart */  
    RTC_Init();      /* Initialize the RTC(ds1307)*/
 
 
   /******Set the time and Date only once*****/
   RTC_SetTime(0x10,0x40,0x20);  //  10:40:20 am
   RTC_SetDate(0x01,0x12,0x12);  //  1st Dec 2012
 
 
   while(1)
    {
        RTC_GetDate(&day,&month,&year);  /* Read the Date from RTC(ds1307) */     
        RTC_GetTime(&hour,&min,&sec);    /* Read the Time from RTC(ds1307) */
 
        UART_Printf("\n\rDate:%x/%x/%x  Time:%x:%x:%x",day,month,year,hour,min,sec);
	}		
}