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DS1307 can not read and write time in arduino.

Discussion in 'Arduino' started by dreamtale, Dec 2, 2014.

  1. dreamtale

    dreamtale New Member

    Joined:
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    hello everyone
    In mid-November, I have designed a shield based on arduino.I have wrote two posts. http://www.electro-tech-online.com/...-back-integrates-a-variety-of-sensors.142927/ and http://www.electro-tech-online.com/threads/arduino-shield-with-magnetometer-clock-and-oled.142780/. have to debug a week.However, it does not work.The OLED display and bluetooth is ok.
    Here is my sch
    20141202175414.jpg Here is my pcb
    IMG_0492.JPG
    You can see in my schematic,I use IIC to connects two devices,they are not wroking properly.First, I tested the DS1307.I found the DS1307 has no answer.
    Here is my code base on arduino.
    Code (text):
    #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 = (byte) ((Serial.read() - 48) * 10 + (Serial.read() - 48));
      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));
      /*second = 50;
      minute = 56;
      hour  = 9;
      dayOfWeek = 2;
      dayOfMonth = 2;
      month = 12;
      year= 14;*/
      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(57600);
    }

    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);
    }
    Time is always parked in the 45:85:85,I know this is the wrong data.I use two leonardo to test.Unfortunately, I still did not get the correct data.Then,I suspect that the IIC on my leonardo is broken.
    I've used other IIC devices, I put GY-30 connected to leonardo, and the code I‘ve been used,it can't work.I borrowed a Duemilanove from others.The GY-30 can work,and the DS1307 in my shield doesn't work.Now I have no idea.anyone can help me,and anyone can upload code about DS1307 base on arduino,In order to confirm the problem in my code or on my PCB.
    Thanks
    dreamtale
     
  2. KeepItSimpleStupid

    KeepItSimpleStupid Well-Known Member Most Helpful Member

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    All I can say is make sure that you have the correct pull-ups on the bus and that they are operating at the voltage they are supposed to. Watch for 5 V and 3.3 volt systems.
     
  3. Ian Rogers

    Ian Rogers Super Moderator Most Helpful Member

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    Does the arduino wire library sort out the R/W on the DS1307.... I usually need to address the DS with 0xD0 and set/reset the RW bit manually...
     
  4. dave

    Dave New Member

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  5. dreamtale

    dreamtale New Member

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    Thank you, I've solved the problem. If no AP2306, DS1307 can work properly.
     
  6. dreamtale

    dreamtale New Member

    Joined:
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    Thank you, I've solved the problem. If no AP2306, DS1307 can work properly.
    I'm sure the problem is the level conversion circuit.
     

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