http://combustory.com/wiki/index.php/RTC1307_-_Real_Time_Clock
/* RTC Control v1.00
* by <http://www.combustory.com> John Vaughters
*
* THIS CODE IS FREE FOR ANYTHING - There is no Rocket Science here. No need to create some long GPL statement.
*
* Credit to:
* Maurice Ribble - http://www.glacialwanderer.com/hobbyrobotics for RTC DS1307 code
* BB Riley - Underhill Center, VT <brianbr@wulfden.org> For simplification of the Day of Week and month
* and updating to Arduino 1.0
* peep rada - from Arduino Forum - Found that only 32 registers per I2C connection was possible
*
* With this code you can set the date/time, retreive the date/time and use the extra memory of an RTC DS1307 chip.
* The program also sets all the extra memory space to 0xff.
* Serial Communication method with the Arduino that utilizes a leading CHAR for each command described below.
*
* Commands:
* T(00-59)(00-59)(00-23)(1-7)(01-31)(01-12)(00-99) - T(sec)(min)(hour)(dayOfWeek)(dayOfMonth)(month)(year) -
* T - Sets the date of the RTC DS1307 Chip.
* Example to set the time for 25-Jan-2012 @ 19:57:11 for the 4 day of the week, use this command - T1157194250112
* Q(1-2) - (Q1) Memory initialization (Q2) RTC - Memory Dump
* R - Read/display the time, day and date
*
* ---------------------------------------------------------
* Notes:
* Version 1.0
* Moving this code to Version 1.0 because this code has been updated to Arduino v1.0 and the features have
* been well tested and improved in a collaborative effort.
* - Fixed the issue of not being able to access all the registers - JWV
* - Added initialization for all non-time registers - JWV
* - Added Dump of all 64 registers - JWV
* - Some Date/Time reformatting and cleanup of display, added Day/Month texts - BBR
* - Made compatible with Arduino 1.0 - BBR
* - Added Rr command for reading date/time - BBR
* - Made commands case insensitive - BBR
* - Create #define varibles to support pre Arduino v1.0 - JWV
* Version 0.01
* Inital code with basics of setting time and the first 37 registers and dumping the first 32 registers.
* The code was based on Maurice Ribble's original code.
*
*/
#include "Wire.h"
#define DS1307_I2C_ADDRESS 0x68 // This is the I2C address
// Arduino version compatibility Pre-Compiler Directives
#if defined(ARDUINO) && ARDUINO >= 100 // Arduino v1.0 and newer
#define I2C_WRITE Wire.write
#define I2C_READ Wire.read
#else // Arduino Prior to v1.0
#define I2C_WRITE Wire.send
#define I2C_READ Wire.receive
#endif
// Global Variables
int command = 0; // This is the command char, in ascii form, sent from the serial port
int i;
long previousMillis = 0; // will store last time Temp was updated
byte second, minute, hour, dayOfWeek, dayOfMonth, month, year;
byte test;
byte zero;
char *Day[] = {"","Sun","Mon","Tue","Wed","Thu","Fri","Sat"};
char *Mon[] = {"","Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"};
// 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) );
}
// 1) Sets the date and time on the ds1307
// 2) Starts the clock
// 3) Sets hour mode to 24 hour clock
// Assumes you're passing in valid numbers, Probably need to put in checks for valid numbers.
void setDateDs1307()
{
second = (byte) ((Serial.read() - 48) * 10 + (Serial.read() - 48)); // Use of (byte) type casting and ascii math to achieve result.
minute = (byte) ((Serial.read() - 48) *10 + (Serial.read() - 48));
hour = (byte) ((Serial.read() - 48) *10 + (Serial.read() - 48));
dayOfWeek = (byte) (Serial.read() - 48);
dayOfMonth = (byte) ((Serial.read() - 48) *10 + (Serial.read() - 48));
month = (byte) ((Serial.read() - 48) *10 + (Serial.read() - 48));
year= (byte) ((Serial.read() - 48) *10 + (Serial.read() - 48));
Wire.beginTransmission(DS1307_I2C_ADDRESS);
I2C_WRITE(zero);
I2C_WRITE(decToBcd(second) & 0x7f); // 0 to bit 7 starts the clock
I2C_WRITE(decToBcd(minute));
I2C_WRITE(decToBcd(hour)); // If you want 12 hour am/pm you need to set
// bit 6 (also need to change readDateDs1307)
I2C_WRITE(decToBcd(dayOfWeek));
I2C_WRITE(decToBcd(dayOfMonth));
I2C_WRITE(decToBcd(month));
I2C_WRITE(decToBcd(year));
Wire.endTransmission();
}
// Gets the date and time from the ds1307 and prints result
void getDateDs1307()
{
// Reset the register pointer
Wire.beginTransmission(DS1307_I2C_ADDRESS);
I2C_WRITE(zero);
Wire.endTransmission();
Wire.requestFrom(DS1307_I2C_ADDRESS, 7);
// A few of these need masks because certain bits are control bits
second = bcdToDec(I2C_READ() & 0x7f);
minute = bcdToDec(I2C_READ());
hour = bcdToDec(I2C_READ() & 0x3f); // Need to change this if 12 hour am/pm
dayOfWeek = bcdToDec(I2C_READ());
dayOfMonth = bcdToDec(I2C_READ());
month = bcdToDec(I2C_READ());
year = bcdToDec(I2C_READ());
if (hour < 10)
Serial.print("0");
Serial.print(hour, DEC);
Serial.print(":");
if (minute < 10)
Serial.print("0");
Serial.print(minute, DEC);
Serial.print(":");
if (second < 10)
Serial.print("0");
Serial.print(second, DEC);
Serial.print(" ");
Serial.print(Day[dayOfWeek]);
Serial.print(", ");
Serial.print(dayOfMonth, DEC);
Serial.print(" ");
Serial.print(Mon[month]);
Serial.print(" 20");
if (year < 10)
Serial.print("0");
Serial.println(year, DEC);
}
void setup() {
Wire.begin();
Serial.begin(57600);
zero=0x00;
}
void loop() {
if (Serial.available()) { // Look for char in serial que and process if found
command = Serial.read();
if (command == 84 || command == 116) { //If command = "Tt" Set Date
setDateDs1307();
getDateDs1307();
Serial.println(" ");
}
else if (command == 82 || command == 114) { //If command = "Rr" Read Date ... BBR
getDateDs1307();
Serial.println(" ");
}
else if (command == 81 || command == 113) { //If command = "Qq" RTC1307 Memory Functions
delay(100);
if (Serial.available()) {
command = Serial.read();
if (command == 49) { //If command = "1" RTC1307 Initialize Memory - All Data will be set to
// 255 (0xff). Therefore 255 or 0 will be an invalid value.
Wire.beginTransmission(DS1307_I2C_ADDRESS); // 255 will be the init value and 0 will be considered
// an error that occurs when the RTC is in Battery mode.
I2C_WRITE(0x08); // Set the register pointer to be just past the date/time registers.
for (i = 1; i <= 24; i++) {
I2C_WRITE(0Xff);
delay(10);
}
Wire.endTransmission();
Wire.beginTransmission(DS1307_I2C_ADDRESS);
I2C_WRITE(0x21); // Set the register pointer to 33 for second half of registers. Only 32 writes per connection allowed.
for (i = 1; i <= 33; i++) {
I2C_WRITE(0Xff);
delay(10);
}
Wire.endTransmission();
getDateDs1307();
Serial.println(": RTC1307 Initialized Memory");
}
else if (command == 50) { //If command = "2" RTC1307 Memory Dump
getDateDs1307();
Serial.println(": RTC 1307 Dump Begin");
Wire.beginTransmission(DS1307_I2C_ADDRESS);
I2C_WRITE(zero);
Wire.endTransmission();
Wire.requestFrom(DS1307_I2C_ADDRESS, 32);
for (i = 0; i <= 31; i++) { //Register 0-31 - only 32 registers allowed per I2C connection
test = I2C_READ();
Serial.print(i);
Serial.print(": ");
Serial.print(test, DEC);
Serial.print(" : ");
Serial.println(test, HEX);
}
Wire.beginTransmission(DS1307_I2C_ADDRESS);
I2C_WRITE(0x20);
Wire.endTransmission();
Wire.requestFrom(DS1307_I2C_ADDRESS, 32);
for (i = 32; i <= 63; i++) { //Register 32-63 - only 32 registers allowed per I2C connection
test = I2C_READ();
Serial.print(i);
Serial.print(": ");
Serial.print(test, DEC);
Serial.print(" : ");
Serial.println(test, HEX);
}
Serial.println(" RTC1307 Dump end");
}
}
}
Serial.print("Command: ");
Serial.println(command); // Echo command CHAR in ascii that was sent
}
command = 0; // reset command
delay(100);
}
//*****************************************************The End***********************
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