Latest revision as of 18:52, 25 August 2016

In this tutorial we'll see, how to interface RTC with PIC18F4520 Starter board. For this we will be using RTC breakout which has DS1307 RTC on it. For basics of RTC just have a look at our Real Time Clock(DS1307) with AVR tutorial.

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1 Prerequisites
2 Hookup
3 Code
4 Demo
5 Downloads

Prerequisites

Please check this tutorial for detailed explanation on DS1307 RTC.

Hookup

Starter PIC board has facility to connect LCD, we will be using 16x2 LCD for displaying the data and time.
The DS1307 RTC module will be connected I2C(SCL-RC.3,SDA-RC.4) pins of Starter board as shown in below image.

Code

	#include "rtc.h"
	#include "lcd.h"
	int main()
	{
	rtc_t rtc;

	/Connect RS->PB0, RW->PB1, EN->PB2 and data bus to PORTB.4 to PORTB.7/
	LCD_SetUp(PB_0,PB_1,PB_2,P_NC,P_NC,P_NC,P_NC,PB_4,PB_5,PB_6,PB_7);
	LCD_Init(2,16);

	/Connect SCL->PC3, SDA->PC4/
	RTC_Init();
	rtc.hour = 0x10; // 10:40:20 am
	rtc.min = 0x40;
	rtc.sec = 0x00;

	rtc.date = 0x01; //1st Jan 2016
	rtc.month = 0x01;
	rtc.year = 0x16;
	rtc.weekDay = 5; // Friday: 5th day of week considering monday as first day.
	/*##### Set the time and Date only once. Once the Time and Date is set, comment these lines
	and reflash the code. Else the time will be set every time the controller is reset*/
	RTC_SetDateTime(&rtc); // 10:40:20 am, 1st Jan 2016
	/* Display the Time and Date continuously */
	while(1)
	{
	RTC_GetDateTime(&rtc);
	LCD_GoToLine(0);
	LCD_Printf("time:%2x:%2x:%2x \nDate:%2x/%2x/%2x",(uint16_t)rtc.hour,(uint16_t)rtc.min,(uint16_t)rtc.sec,(uint16_t)rtc.date,(uint16_t)rtc.month,(uint16_t)rtc.year);
	}
	return (0);
	}