- #include <Wire.h>
- int clockAddress = 0x68; // This is the I2C address
- int command = 0; // This is the command char, in ascii form, sent from the serial port
- long previousMillis = 0; // will store last time Temp was updated
- byte second, minute, hour, dayOfWeek, dayOfMonth, month, year;
- byte test;
- // 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()
- {
- // Use of (byte) type casting and ascii math to achieve result.
- second = 12;
- minute = 33;
- hour = 16;
- dayOfWeek = 1;
- dayOfMonth = 2;
- month = 3;
- year= 50;
- Wire.beginTransmission(clockAddress);
- Wire.write(byte(0x00));
- 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();
- }
- // Gets the date and time from the ds1307 and prints result
- void getDateDs1307() {
- // Reset the register pointer
- Wire.beginTransmission(clockAddress);
- Wire.write(byte(0x00));
- Wire.endTransmission();
- Wire.requestFrom(clockAddress, 7);
- // A few of these need masks because certain bits are control bits
- second = bcdToDec(Wire.read() & 0x7f);
- minute = bcdToDec(Wire.read());
-
- // Need to change this if 12 hour am/pm
- hour = bcdToDec(Wire.read() & 0x3f);
- dayOfWeek = bcdToDec(Wire.read());
- dayOfMonth = bcdToDec(Wire.read());
- month = bcdToDec(Wire.read());
- year = bcdToDec(Wire.read());
- Serial.print(hour, DEC);
- Serial.print(":");
- Serial.print(minute, DEC);
- Serial.print(":");
- Serial.print(second, DEC);
- Serial.print(" ");
- Serial.print(month, DEC);
- Serial.print("/");
- Serial.print(dayOfMonth, DEC);
- Serial.print("/");
- Serial.print(year, DEC);
- }
- void setup() {
- Wire.begin();
- Serial.begin(9600);
- }
- void loop() {
- if (Serial.available()) { // Look for char in serial que and process if found
- command = Serial.read();
- if (command == 84) { //If command = "T" Set Date
- setDateDs1307();
- getDateDs1307();
- Serial.println(" ");
- }
- else if (command == 81) { //If command = "Q" RTC1307 Memory Functions
- delay(100);
- if (Serial.available()) {
- command = Serial.read();
-
- // If command = "1" RTC1307 Initialize Memory - All Data will be set to 255 (0xff).
- // Therefore 255 or 0 will be an invalid value.
- if (command == 49) {
-
- // 255 will be the init value and 0 will be cosidered an error that
- // occurs when the RTC is in Battery mode.
- Wire.beginTransmission(clockAddress);
-
- // Set the register pointer to be just past the date/time registers.
- Wire.write(byte(0x08));
- for (int i = 1; i <= 27; i++) {
- Wire.write(byte(0xff));
- delay(100);
- }
- 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(clockAddress);
- Wire.write(byte(0x00));
- Wire.endTransmission();
- Wire.requestFrom(clockAddress, 64);
- for (int i = 1; i <= 64; i++) {
- test = Wire.read();
- Serial.print(i);
- Serial.print(":");
- Serial.println(test, DEC);
- }
- 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);
- }
开始找到的是这个，这是一个简单的可以工作的程序 |
发表于 2012-10-28 14:06:23
楼主
