Here Iam interfacing DS1307 with msp430g2553 in Energia 0101E0011 , using "wire.h" .
The hour, minute ,and second is displayed on energia serial monitor.The remaining can be easily added.
The output can displayed on LCD if it is interfaced with this .
The common mistake everyone encounter with ds1307 and msp430 is that ds1307 is working in minimum 4.5 volt max 5v and msp430g2553 is low power max 3.5v. Here I changed the pullup voltage to 3.5 volt for ds1307 and vcc is 5v and also low power for msp430.
http://datasheets.maximintegrated.com/en/ds/DS1307.pdf this is the ds1307 datasheet.
The code is added below.
The hour, minute ,and second is displayed on energia serial monitor.The remaining can be easily added.
The output can displayed on LCD if it is interfaced with this .
The common mistake everyone encounter with ds1307 and msp430 is that ds1307 is working in minimum 4.5 volt max 5v and msp430g2553 is low power max 3.5v. Here I changed the pullup voltage to 3.5 volt for ds1307 and vcc is 5v and also low power for msp430.
http://datasheets.maximintegrated.com/en/ds/DS1307.pdf this is the ds1307 datasheet.
The code is added below.
/////////////////////////////////
#include "Wire.h" //for DS1307 I2C
#include <string.h>
#include <math.h>
#define DS1307_I2C_ADDRESS 0x68
byte second, minute, hour, dayOfWeek,
dayOfMonth, month, year;
void setup()
{
Wire.begin();
Serial.begin(9600);
/*
//////here programmer set the current time ,from where the ds runs
*/
second = 45;
minute = 30;
hour
= 16;
dayOfWeek = 5;
dayOfMonth = 20;
month = 3;
year
= 12;
setDateDs1307(second, minute, hour, dayOfWeek, dayOfMonth, month, year);
}
void loop()
{
getDateDs1307(&second, &minute,
&hour, &dayOfWeek, &dayOfMonth, &month, &year);///to get
current time from ds1307
timedisplay();
}
void timedisplay() ///////////Function to display
current time
{
Serial.print(hour, DEC);
Serial.print(":");
Serial.print(minute, DEC);
Serial.print(":");
Serial.print(second, DEC);
Serial.println(" ");
delay(1000);
}
void getDateDs1307(byte *second, // Gets the date and time from the ds1307
byte *minute,
byte *hour,
byte *dayOfWeek,
byte *dayOfMonth,
byte *month,
byte *year)
{
//
Reset the register pointer
Wire.beginTransmission(DS1307_I2C_ADDRESS);
Wire.write(0);
Wire.endTransmission();
Wire.requestFrom(DS1307_I2C_ADDRESS, 7);
// A
few of these need masks because certain bits are control bits
*second = bcdToDec(Wire.read()
& 0x7f);
*minute =
bcdToDec(Wire.read());
*hour = bcdToDec(Wire.read()
& 0x3f); // Need to change this if
12 hour am/pm
*dayOfWeek =
bcdToDec(Wire.read());
*dayOfMonth = bcdToDec(Wire.read());
*month =
bcdToDec(Wire.read());
*year =
bcdToDec(Wire.read());
}
void setDateDs1307(byte second, // 0-59 ///to set time in ds1307
byte minute, // 0-59
byte hour, // 1-23
byte dayOfWeek, // 1-7
byte dayOfMonth, // 1-28/29/30/31
byte month, // 1-12
byte year) // 0-99
{
Wire.beginTransmission(DS1307_I2C_ADDRESS);
Wire.write(0);
Wire.write(decToBcd(second));
// 0 to bit 7 starts the clock
Wire.write(decToBcd(minute));
Wire.write(decToBcd(hour));
// If you want 12 hour am/pm you need to set
// bit 6
(also need to change readDateDs1307)
Wire.write(decToBcd(dayOfWeek));
Wire.write(decToBcd(dayOfMonth));
Wire.write(decToBcd(month));
Wire.write(decToBcd(year));
Wire.endTransmission();
}
// Convert normal decimal numbers to binary
coded decimal
byte decToBcd(byte val)
{
return ( (val/10*16) + (val%10) );
}
// Convert binary coded decimal to normal
decimal numbers
byte bcdToDec(byte val)
{
return ( (val/16*10) + (val%16) );
}
The circuit is below
