Now in this tutorial we will interface RTC (Real time clock) with Atmega32 breakout board. For this tutorial we will require RTC Breakout ,LCD Breakout and 16x2 LCD to display the time.
Contents
[hide]Basics
In this example we are using DS1307 RTC. It will communicate through I2C protocol with controller. Connect SCL and SDA of RTC Breakout to SCL and SDA of ATmega32. Connect D4 to D7 of LCD Breakout to PORT B4 to PORT B7
and RS,R/W,E to PORT B0 to PORT B2 respectively as shown in hook up.
Refer Real Time Clock(DS1307) with AVR tutorial for RTC basics.
Hook Up
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->PC0, SDA->PC1*/ | |
| 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); | |
| } |
Downloads
Download the complete project folder from the below link:
https://github.com/ExploreEmbedded/AVR-MCU-Breakout-Board/archive/master.zip
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