120 lines
3.4 KiB
C++
120 lines
3.4 KiB
C++
/*
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* Maurice Ribble
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* 4-17-2008
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* http://www.glacialwanderer.com/hobbyrobotics
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* This code tests the DS1307 Real Time clock on the Arduino board.
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* The ds1307 works in binary coded decimal or BCD. You can look up
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* bcd in google if you aren't familior with it. There can output
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* a square wave, but I don't expose that in this code. See the
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* ds1307 for it's full capabilities.
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*
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* Add Wire.begin(); to main setup function when ready to use.
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*
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* Modified 9/12/2009 by Arclight for C library use.
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* arclight@gmail.com
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*/
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#include <DS1307.h>
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#include <Wire.h>
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DS1307::DS1307(){
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}
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DS1307::~DS1307(){
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}
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// Convert normal decimal numbers to binary coded decimal
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uint8_t DS1307::decToBcd(uint8_t val)
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{
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return ( (val/10*16) + (val%10) );
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}
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// Convert binary coded decimal to normal decimal numbers
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uint8_t DS1307::bcdToDec(uint8_t val)
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{
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return ( (val/16*10) + (val%16) );
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}
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// Stops the DS1307, but it has the side effect of setting seconds to 0
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// Probably only want to use this for testing
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/*
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void DS1307::stopDs1307()
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{
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Wire.beginTransmission(DS1307_I2C_ADDRESS);
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Wire.write(0);
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Wire.write(0x80);
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Wire.endTransmission();
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}
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*/
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// 1) Sets the date and time on the ds1307
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// 2) Starts the clock
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// 3) Sets hour mode to 24 hour clock
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// Assumes you're passing in valid numbers
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void DS1307::setDateDs1307(uint8_t second, // 0-59
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uint8_t minute, // 0-59
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uint8_t hour, // 1-23
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uint8_t dayOfWeek, // 1-7
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uint8_t dayOfMonth, // 1-28/29/30/31
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uint8_t month, // 1-12
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uint8_t year) // 0-99
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{
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Wire.beginTransmission(DS1307_I2C_ADDRESS);
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Wire.write(byte(0));
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Wire.write(decToBcd(second)); // 0 to bit 7 starts the clock
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Wire.write(decToBcd(minute));
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Wire.write(decToBcd(hour)); // If you want 12 hour am/pm you need to set
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// bit 6 (also need to change readDateDs1307)
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Wire.write(decToBcd(dayOfWeek));
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Wire.write(decToBcd(dayOfMonth));
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Wire.write(decToBcd(month));
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Wire.write(decToBcd(year));
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Wire.endTransmission();
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}
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// Gets the date and time from the ds1307
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void DS1307::getDateDs1307(uint8_t *second,
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uint8_t *minute,
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uint8_t *hour,
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uint8_t *dayOfWeek,
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uint8_t *dayOfMonth,
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uint8_t *month,
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uint8_t *year)
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{
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// Reset the register pointer
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Wire.beginTransmission(DS1307_I2C_ADDRESS);
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Wire.write(byte(0));
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Wire.endTransmission();
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Wire.requestFrom(DS1307_I2C_ADDRESS, 7);
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// A few of these need masks because certain bits are control bits
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*second = bcdToDec(Wire.read() & 0x7f);
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*minute = bcdToDec(Wire.read());
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*hour = bcdToDec(Wire.read() & 0x3f); // Need to change this if 12 hour am/pm
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*dayOfWeek = bcdToDec(Wire.read());
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*dayOfMonth = bcdToDec(Wire.read());
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*month = bcdToDec(Wire.read());
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*year = bcdToDec(Wire.read());
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}
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/*
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// Change these values to what you want to set your clock to.
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// You probably only want to set your clock once and then remove
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// the setDateDs1307 call.
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uint8_t second = 20;
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uint8_t minute = 9;
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uint8_t hour = 19;
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uint8_t dayOfWeek = 6;
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uint8_t dayOfMonth = 12;
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uint8_t month = 9;
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uint8_t year = 9;
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setDateDs1307(second, minute, hour, dayOfWeek, dayOfMonth, month, year);
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*/
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