Open_Access_Control_Ethernet/DS1307/DS1307.cpp

119 lines
3.3 KiB
C++
Raw Normal View History

2012-08-09 05:55:07 +00:00
/*
* Maurice Ribble
* 4-17-2008
* http://www.glacialwanderer.com/hobbyrobotics
* This code tests the DS1307 Real Time clock on the Arduino board.
* The ds1307 works in binary coded decimal or BCD. You can look up
* bcd in google if you aren't familior with it. There can output
* a square wave, but I don't expose that in this code. See the
* ds1307 for it's full capabilities.
*
* Add Wire.begin(); to main setup function when ready to use.
*
* Modified 9/12/2009 by Arclight for C library use.
* arclight@gmail.com
*/
#include <DS1307.h>
#include <Wire.h>
DS1307::DS1307(){
}
DS1307::~DS1307(){
}
// Convert normal decimal numbers to binary coded decimal
byte DS1307::decToBcd(byte val)
{
return ( (val/10*16) + (val%10) );
}
// Convert binary coded decimal to normal decimal numbers
byte DS1307::bcdToDec(byte val)
{
return ( (val/16*10) + (val%16) );
}
// Stops the DS1307, but it has the side effect of setting seconds to 0
// Probably only want to use this for testing
/*
void DS1307::stopDs1307()
{
Wire.beginTransmission(DS1307_I2C_ADDRESS);
Wire.write(0);
Wire.write(0x80);
2012-08-09 05:55:07 +00:00
Wire.endTransmission();
}
*/
// 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
void DS1307::setDateDs1307(byte second, // 0-59
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
2012-08-09 05:55:07 +00:00
// bit 6 (also need to change readDateDs1307)
Wire.write(decToBcd(dayOfWeek));
Wire.write(decToBcd(dayOfMonth));
Wire.write(decToBcd(month));
Wire.write(decToBcd(year));
2012-08-09 05:55:07 +00:00
Wire.endTransmission();
}
// Gets the date and time from the ds1307
void DS1307::getDateDs1307(byte *second,
byte *minute,
byte *hour,
byte *dayOfWeek,
byte *dayOfMonth,
byte *month,
byte *year)
{
// Reset the register pointer
Wire.beginTransmission(DS1307_I2C_ADDRESS);
Wire.write(0);
2012-08-09 05:55:07 +00:00
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());
2012-08-09 05:55:07 +00:00
}
/*
// Change these values to what you want to set your clock to.
// You probably only want to set your clock once and then remove
// the setDateDs1307 call.
byte second = 20;
byte minute = 9;
byte hour = 19;
byte dayOfWeek = 6;
byte dayOfMonth = 12;
byte month = 9;
byte year = 9;
setDateDs1307(second, minute, hour, dayOfWeek, dayOfMonth, month, year);
*/