Arduino Forum

Using Arduino => Storage => Topic started by: urthlight on Jan 16, 2013, 04:15 pm

Title: power outage recovery using DS1307 Real Time Clock
Post by: urthlight on Jan 16, 2013, 04:15 pm
I have a project that uses a state machine with a master counter. The counter will have a maximum value of 750 or so. The state will be no larger than 50. As the counter updates every second it needs to be stored along with the state. The life span of the EEPROM rules him out so I decided to use the  leftover space on the RTC memory map. On power up I will read the contents of the ram to get state and counter values (If there was a power outage the numbers will not be state = 0 and counter = 0) and plug those values into the program during setup so that the state machine can resume where it left off.

.....So the question is how best to cut up that 750 number to store it in a couple of bytes on the RTC and then to reassemble the number after reading from the RAM. 
Title: Re: power outage recovery using DS1307 Real Time Clock
Post by: PaulS on Jan 16, 2013, 04:58 pm
Quote
So the question is how best to cut up that 750 number

highByte() and lowByte().

Quote
and then to reassemble the number after reading from the RAM.   

word().
Title: Re: power outage recovery using DS1307 Real Time Clock
Post by: urthlight on Jan 16, 2013, 07:51 pm
Word!
have you got any example code showing how to implement such a thing?
Title: Re: power outage recovery using DS1307 Real Time Clock
Post by: PaulS on Jan 16, 2013, 08:38 pm
Did you bother looking at the reference page?
http://arduino.cc/en/Reference/WordCast (http://arduino.cc/en/Reference/WordCast)
Title: Re: power outage recovery using DS1307 Real Time Clock
Post by: CrossRoads on Jan 16, 2013, 09:10 pm
Need  the Wire page too.
With DS1307, start by setting the register pointer to byte 56 where the battery backed SRAM starts.
Then do 2 Wire.send messages to send the data over.

Same for reading it back.
Set the register pointer, then do 2 Wire.read (wire.receive?) to bring the 2 bytes back.
Title: Re: power outage recovery using DS1307 Real Time Clock
Post by: urthlight on Jan 16, 2013, 09:45 pm
Quote
Did you bother looking at the reference page?
http://arduino.cc/en/Reference/WordCast

I did and found it rather terse.
I have established two way communications with the RTC that is working with only a few bugs.
The code is ugly and I don't understand everything going on yet  but the real issue is the smashing and reconstruction of the data.

Title: Re: power outage recovery using DS1307 Real Time Clock
Post by: CrossRoads on Jan 16, 2013, 10:12 pm
You have the number stored using data type int, yes?
Code: [Select]

int bigNumber = 750;

To send it out, after the address is set up:
Wire.write (highByte(bigNumber));
Wire.write (lowByte(bigNumber));

to put it back, after the address is set up:
upperByte = Wire.read();
lowerByte = Wire.read();

then
bigNumber = word(upperByte, lowerByte);
or
bigNumber = (upperByte <<8) + lowerByte; // shift upper bits into upper byte location, add in lower bits

or without interim storage:
bigNumber = (Wire.read() << 8) + Wire.read();


http://arduino.cc/en/Reference/Wire
http://arduino.cc/en/Reference/WireWrite
http://arduino.cc/en/Reference/WireRead
Title: Re: power outage recovery using DS1307 Real Time Clock
Post by: urthlight on Jan 16, 2013, 10:30 pm
Quote
You have the number stored using data type int, yes?

No I used Byte which was what the example showed. It seemed right should I change it?
I will post the trimmed down example I am working with.

Code: [Select]
/* Q(1-2) - (Q1) Memory initialization  (Q2) RTC - Memory Dump 

*/

#include "Wire.h"
#define DS1307_I2C_ADDRESS 0x68  // This is the I2C address
#define I2C_WRITE Wire.write
#define I2C_READ Wire.read
// 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;
byte highbyte;
byte lowbyte;
byte state;

// 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) );
}


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 == 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.

          Wire.endTransmission();
          Wire.beginTransmission(DS1307_I2C_ADDRESS);   

        // load dummy values to read back
          I2C_WRITE(0X08); // Set the register pointer to 33 for second half of registers. Only 32 writes per connection allowed.
          I2C_WRITE(24);
          I2C_WRITE(0X09); // Set the register pointer to 33 for second half of registers. Only 32 writes per connection allowed.
          I2C_WRITE(52);
          I2C_WRITE(0X0A); // Set the register pointer to 33 for second half of registers. Only 32 writes per connection allowed.
          I2C_WRITE(200);

          Wire.endTransmission();

          Serial.println(": RTC1307 Initialized Memory");
        }
        else if (command == 50) {      //If command = "2" RTC1307 Memory Dump

          Serial.println(": RTC 1307 Dump Begin");
          Wire.beginTransmission(DS1307_I2C_ADDRESS);
          I2C_WRITE(0x08);                             // Set the register pointer to (0x08) to read first memory byte
          Wire.endTransmission();                     
          Wire.requestFrom(DS1307_I2C_ADDRESS, 1);     // In this case only read one byte
          state = Wire.read();
          //Serial.println(": RTC 1307 Dump Begin");
          Wire.beginTransmission(DS1307_I2C_ADDRESS);
          I2C_WRITE(0x09);                             // Set the register pointer to (0x08) to read first memory byte
          Wire.endTransmission();                     
          Wire.requestFrom(DS1307_I2C_ADDRESS, 3);     // In this case only read one by
          highbyte
            = Wire.read();


          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***********************



Title: Re: power outage recovery using DS1307 Real Time Clock
Post by: CrossRoads on Jan 16, 2013, 10:52 pm
You can only store 0-255 in a byte.
To store 0-65535 (which is where 750 fits in) you need to use an int.
Title: Re: power outage recovery using DS1307 Real Time Clock
Post by: urthlight on Jan 17, 2013, 01:03 am
Quote
You can only store 0-255 in a byte.
To store 0-65535 (which is where 750 fits in) you need to use an int.


Check!
Makes sense. I was chopping it up in hundreds tens and ones. So 65535  is represented by two bytes. Int is doubleprecision ..Highbyte & Lowbyte.... Word puts them together.....got it

Thank you for help!
Title: Re: power outage recovery using DS1307 Real Time Clock
Post by: CrossRoads on Jan 17, 2013, 01:17 am
"Int is doubleprecision"
Well, it's 16 bits anyway 8)
Title: Re: power outage recovery using DS1307 Real Time Clock
Post by: urthlight on Jan 20, 2013, 11:55 pm
OK, Some great help so far I have gotten this much running
Code: [Select]
/*
* Q(1-2) - (Q1) Memory Load  (Q2) RTC - Memory Read 

*/
#include "Wire.h"
#define DS1307_I2C_ADDRESS 0x68  // This is the I2C address
// Global Variables
int command = 0;       // This is the command char, in ascii form, sent from the serial port     
byte zero;
int  state   = 50;     // State machine variable
int  counter = 4;      // Master counter variable
int magnum1 = 99;      // dummy var
int magnum2 = 99;      //  dummy var

void setup() {
  Wire.begin();           // join i2c bus
  Serial.begin(57600);
  zero=0x00;             // not sure what this is for
}

void loop() {
  if (Serial.available()) {      // Look for char in serial que and process if found
    command = Serial.read();

    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"  load data to RAM
          Wire.beginTransmission(DS1307_I2C_ADDRESS);   // 255 will be the init value and 0 will be considered
          Wire.write(32);                   // Set the register pointer to before data location
          Wire.write(magnum1);              // Write magic number before storing data
          Wire.write(state);                // Store State variable
          Wire.write(counter >> 8);         // writes the high byte of counter
          Wire.write(counter & 0xFF);       // writes the low byte of counter
          Wire.write(magnum2);              // Write magic number after storing data
          Wire.endTransmission();

          Serial.println("Data Stored");
        }
        else if (command == 50) {      //If command = "2" Read data from RAM
          Serial.println("Begin Read");
          Wire.beginTransmission(DS1307_I2C_ADDRESS);
          Wire.write(zero);   // not sure what this is for
          Wire.endTransmission();

          Wire.beginTransmission(DS1307_I2C_ADDRESS);
          Wire.write(0x20);         // not sure what this is doing
          Wire.endTransmission();
          Wire.requestFrom(DS1307_I2C_ADDRESS, 32);  // Set pointer to the first byte of data

          magnum1 = (Wire.read());  //magic number written before data write
          state = (Wire.read());    // Read state data
          counter = (Wire.read() << 8) + Wire.read(); // Read first byte shift left read second byte
          magnum2 = (Wire.read());  // Read Magic number written after data write
          Serial.print(" Magic Number = ");
          Serial.println(magnum1);
          Serial.print(" State = ");
          Serial.println(state);
          Serial.print(" Counter = ");
          Serial.println(counter);
          Serial.print(" Magic Number = ");
          Serial.println(magnum2);
          Serial.println(" RTC1307 Dump end");
        }
      } 
    }
  }
  command = 0;                 // reset command
  delay(100);
}
//********************************


now to figure out how to generate a random magic number
Title: Re: power outage recovery using DS1307 Real Time Clock
Post by: PaulS on Jan 21, 2013, 12:35 am
Is it OK if the random number has no magic properties?
Title: Re: power outage recovery using DS1307 Real Time Clock
Post by: urthlight on Jan 21, 2013, 12:57 am
Indeed
Title: Re: power outage recovery using DS1307 Real Time Clock
Post by: PaulS on Jan 21, 2013, 01:12 pm
The random() function will return a pseudo-random number. For most purposes, that is good enough. The whole topic of true random numbers has been beaten to death here, so I won't go into all that you have to do to get true random numbers. Or, how to properly seed the random number generator.
Title: Re: power outage recovery using DS1307 Real Time Clock
Post by: urthlight on Jan 21, 2013, 02:07 pm
The example code uses noise from an unused analog pin seed the random() function. I think that will be good enough. My application does not require TRUE random numbers. The repeating pattern would really be good enough.
Title: Re: power outage recovery using DS1307 Real Time Clock
Post by: urthlight on Jan 22, 2013, 03:54 am
Now enter maximum weirdness .
I took the older code and turned it into a couple of functions. I swear it worked last night very late. At work today this code froze at the uploading point and made  my serial programming port unreachable. I determined that the ReadRTCRAM() function is to blame. Does this make any sense to anybody
Code: [Select]
/*
* Q(1-2) - (Q1) Memory Load  (Q2) RTC - Memory Read  

*/
#include "Wire.h"
#define DS1307_I2C_ADDRESS 0x68  // This is the I2C address


// Global Variables
long randNumber;
int command = 0;       // This is the command char, in ascii form, sent from the serial port    
byte zero;
int magnum1 = 90;      // dummy var
int magnum2 = 9;      //  dummy var

int  state   = 96;     // State machine variable
int  counter = 255;      // Master counter variable

void setup() {
  randomSeed(4);
 Wire.begin();           // join i2c bus
 Serial.begin(57600);
 zero=0x00;             // not sure what this is for
}

void loop() {
 if (Serial.available()) {      // Look for char in serial que and process if found
   command = Serial.read();

   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"  load data to RAM
        WriteRTCRAM();
       }
       else if (command == 50) {      //If command = "2" Read data from RAM
         ReadRTCRAM();
       }
     }  
   }
 }
 command = 0;                 // reset command
 delay(100);
}
//********************************
void WriteRTCRAM(){
   randNumber = random(250);
 Serial.println(randNumber);  

Wire.beginTransmission(DS1307_I2C_ADDRESS);   // 255 will be the init value and 0 will be considered
         Wire.write(32);                   // Set the register pointer to before data location
         Wire.write(randNumber);              // Write magic number before storing data
         Wire.write(state);                // Store State variable
         Wire.write(counter >> 8);         // writes the high byte of counter
         Wire.write(counter & 0xFF);       // writes the low byte of counter
         Wire.write(randNumber);              // Write magic number after storing data
         Wire.endTransmission();

         Serial.println("Data Stored");
}
//********************************
void ReadRTCRAM(){
Serial.println("Begin Read");
         Wire.beginTransmission(DS1307_I2C_ADDRESS);
         Wire.write(zero);   // not sure what this is for
         Wire.endTransmission();

         Wire.beginTransmission(DS1307_I2C_ADDRESS);
         Wire.write(0x20);         // not sure what this is doing
         Wire.endTransmission();
         Wire.requestFrom(DS1307_I2C_ADDRESS, 32);  // Set pointer to the first byte of data

         magnum1 = (Wire.read());  //magic number written before data write
         state = (Wire.read());    // Read state data
         counter = (Wire.read() << 8) + Wire.read(); // Read first byte shift left read second byte
         magnum2 = (Wire.read());  // Read Magic number written after data write
         Serial.print(" Magic Number = ");
         Serial.println(magnum1);
         Serial.print(" State = ");
         Serial.println(state);
         Serial.print(" Counter = ");
         Serial.println(counter);
         Serial.print(" Magic Number = ");
         Serial.println(magnum2);
         Serial.println(" RTC1307 Dump end");
         if (magnum1 = magnum2){
         Serial.print (" Write Error!!!");
         }
}

this is just too strange
Title: Re: power outage recovery using DS1307 Real Time Clock
Post by: PaulS on Jan 22, 2013, 01:56 pm
Code: [Select]
    if (command == 81 || command == 113) {      //If command = "Qq" RTC1307 Memory Functions

Why not make it easy to read this code?
Code: [Select]
    if (command == 'Q' || command == 'q') {      // No comment needed; its obvious what to type

Code: [Select]
          magnum1 = (Wire.read());  //magic number written before data write
          state = (Wire.read());    // Read state data
          counter = (Wire.read() << 8) + Wire.read(); // Read first byte shift left read second byte
          magnum2 = (Wire.read());  // Read Magic number written after data write

(What's) (with) (all) (the) (parentheses) (?)

Code: [Select]
          if (magnum1 = magnum2){
Yeah, right. An assignment in the middle of an if statement...

Code: [Select]
          Wire.write(zero);   // not sure what this is for
          Wire.write(0x20);         // not sure what this is doing

Don't you think you should figure these out?
Title: Re: power outage recovery using DS1307 Real Time Clock
Post by: urthlight on Jan 22, 2013, 06:07 pm
Insert Quote
Code: [Select]


   if (command == 81 || command == 113) {      //If command = "Qq" RTC1307 Memory Functions

Quote

Why not make it easy to read this code?

Ok np but this is just temp code to get it running



 
Code: [Select]

         magnum1 = (Wire.read());  //magic number written before data write
         state = (Wire.read());    // Read state data
         counter = (Wire.read() << 8) + Wire.read(); // Read first byte shift left read second byte
         magnum2 = (Wire.read());  // Read Magic number written after data write

Quote

(What's) (with) (all) (the) (parentheses) (?)


Ok fixed

Code: [Select]

         if (magnum1 = magnum2){

Quote

Yeah, right. An assignment in the middle of an if statement...

Ah this is supposed to be
Code: [Select]
[code]
         if (magnum1 != magnum2){
[/code]

Code: [Select]


         Wire.write(zero);   // not sure what this is for
         Wire.write(0x20);         // not sure what this is doing

Quote

Don't you think you should figure these out?


Well being new to  the TWI I dont fully understand but I did find
   Issue 527 : Stream-based Wire library doesn't accept zero
and the fix  which I used.

and still after all of this I still cannot get this to upload unless I REM out the If statement.

Title: Re: power outage recovery using DS1307 Real Time Clock
Post by: PaulS on Jan 22, 2013, 06:10 pm
Quote
and still after all of this I still cannot get this to compile unless I REM out the If statement.

Time to post new code, and the error messages.
Title: Re: power outage recovery using DS1307 Real Time Clock
Post by: urthlight on Jan 22, 2013, 06:18 pm
Code: [Select]
/*
* Q(1-2) - (Q1) Memory Load  (Q2) RTC - Memory Read 

*/
#include "Wire.h"
#define DS1307_I2C_ADDRESS 0x68  // This is the I2C address


// Global Variables
long randNumber;
int command = 0;       // This is the command char, in ascii form, sent from the serial port     
byte zero;
int  state   = 96;     // State machine variable
int  counter = 255;      // Master counter variable
int magnum1 = 90;      // dummy var
int magnum2 = 9;      //  dummy var

void setup() {
   randomSeed(analogRead(0));
  Wire.begin();           // join i2c bus
  Serial.begin(57600);
  zero=0x00;             // not sure what this is for
}

void loop() {
  if (Serial.available()) {      // Look for char in serial que and process if found
    command = Serial.read();

    if (command == 'Q' || command == 'q') {   
      delay(100);     
      if (Serial.available()) {
        command = Serial.read();
        if (command == 49) {                //If command = "1"  load data to RAM
         WriteRTCRAM();
        }
        else if (command == 50) {      //If command = "2" Read data from RAM
          ReadRTCRAM();
        }
      } 
    }
  }
  command = 0;                 // reset command
  delay(100);
}
//********************************
void WriteRTCRAM(){
    randNumber = random(250);
  Serial.println(randNumber); 

Wire.beginTransmission(DS1307_I2C_ADDRESS);   // 255 will be the init value and 0 will be considered
          Wire.write(32);                   // Set the register pointer to before data location
          Wire.write(randNumber);              // Write magic number before storing data
          Wire.write(state);                // Store State variable
          Wire.write(counter >> 8);         // writes the high byte of counter
          Wire.write(counter & 0xFF);       // writes the low byte of counter
          Wire.write(randNumber);              // Write magic number after storing data
          Wire.endTransmission();

          Serial.println("Data Stored");
}

void ReadRTCRAM(){
Serial.println("Begin Read");
          Wire.beginTransmission(DS1307_I2C_ADDRESS);
          Wire.write(zero);   // not sure what this is for
          Wire.endTransmission();

          Wire.beginTransmission(DS1307_I2C_ADDRESS);
          Wire.write(0x20);         // not sure what this is doing
          Wire.endTransmission();
          Wire.requestFrom(DS1307_I2C_ADDRESS, 32);  // Set pointer to the first byte of data

          magnum1 = Wire.read();  //magic number written before data write
          state = Wire.read();    // Read state data
          counter = Wire.read() << 8 + Wire.read(); // Read first byte shift left read second byte
          magnum2 = Wire.read();  // Read Magic number written after data write
          Serial.print(" Magic Number = ");
          Serial.println(magnum1);
          Serial.print(" State = ");
          Serial.println(state);
          Serial.print(" Counter = ");
          Serial.println(counter);
          Serial.print(" Magic Number = ");
          Serial.println(magnum2);
          Serial.println(" RTC1307 Dump end");
          if (magnum1 != magnum2){
          Serial.print (" Write Error!!!");
          }
}


This compiles but will not upload

Code: [Select]
/*
* Q(1-2) - (Q1) Memory Load  (Q2) RTC - Memory Read 

*/
#include "Wire.h"
#define DS1307_I2C_ADDRESS 0x68  // This is the I2C address


// Global Variables
long randNumber;
int command = 0;       // This is the command char, in ascii form, sent from the serial port     
byte zero;
int  state   = 96;     // State machine variable
int  counter = 255;      // Master counter variable
int magnum1 = 90;      // dummy var
int magnum2 = 9;      //  dummy var

void setup() {
   randomSeed(analogRead(0));
  Wire.begin();           // join i2c bus
  Serial.begin(57600);
  zero=0x00;             // not sure what this is for
}

void loop() {
  if (Serial.available()) {      // Look for char in serial que and process if found
    command = Serial.read();

    if (command == 'Q' || command == 'q') {   
      delay(100);     
      if (Serial.available()) {
        command = Serial.read();
        if (command == 49) {                //If command = "1"  load data to RAM
         WriteRTCRAM();
        }
        else if (command == 50) {      //If command = "2" Read data from RAM
          ReadRTCRAM();
        }
      } 
    }
  }
  command = 0;                 // reset command
  delay(100);
}
//********************************
void WriteRTCRAM(){
    randNumber = random(250);
  Serial.println(randNumber); 

Wire.beginTransmission(DS1307_I2C_ADDRESS);   // 255 will be the init value and 0 will be considered
          Wire.write(32);                   // Set the register pointer to before data location
          Wire.write(randNumber);              // Write magic number before storing data
          Wire.write(state);                // Store State variable
          Wire.write(counter >> 8);         // writes the high byte of counter
          Wire.write(counter & 0xFF);       // writes the low byte of counter
          Wire.write(randNumber);              // Write magic number after storing data
          Wire.endTransmission();

          Serial.println("Data Stored");
}

void ReadRTCRAM(){
Serial.println("Begin Read");
          Wire.beginTransmission(DS1307_I2C_ADDRESS);
          Wire.write(zero);   // not sure what this is for
          Wire.endTransmission();

          Wire.beginTransmission(DS1307_I2C_ADDRESS);
          Wire.write(0x20);         // not sure what this is doing
          Wire.endTransmission();
          Wire.requestFrom(DS1307_I2C_ADDRESS, 32);  // Set pointer to the first byte of data

          magnum1 = Wire.read();  //magic number written before data write
          state = Wire.read();    // Read state data
          counter = Wire.read() << 8 + Wire.read(); // Read first byte shift left read second byte
          magnum2 = Wire.read();  // Read Magic number written after data write
          Serial.print(" Magic Number = ");
          Serial.println(magnum1);
          Serial.print(" State = ");
          Serial.println(state);
          Serial.print(" Counter = ");
          Serial.println(counter);
          Serial.print(" Magic Number = ");
          Serial.println(magnum2);
          Serial.println(" RTC1307 Dump end");
         // if (magnum1 != magnum2){
        //  Serial.print (" Write Error!!!");
         // }
}


This compiles and uploads

No error code green progress bar fills up to the last 3 white spaces and holds, to the left it says uploading.
Eventually I get a time out message. Waiting now so I can quote it.
Title: Re: power outage recovery using DS1307 Real Time Clock
Post by: urthlight on Jan 22, 2013, 06:22 pm
Code: [Select]
avrdude: stk500v2_ReceiveMessage(): timeout
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avrdude: stk500v2_getsync(): timeout communicating with programmer
avrdude: stk500v2_ReceiveMessage(): timeout
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avrdude: stk500v2_getsync(): timeout communicating with programmer
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avrdude: stk500v2_getsync(): timeout communicating with programmer
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avrdude: stk500v2_getsync(): timeout communicating with programmer
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avrdude: stk500v2_ReceiveMessage(): timeout
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avrdude: stk500v2_getsync(): timeout communicating with programmer
avrdude: stk500v2_command(): failed miserably to execute command 0x13
avrdude: stk500v2_paged_write: write command failed
avrdude: stk500v2_ReceiveMessage(): timeout
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avrdude: stk500v2_getsync(): timeout communicating with programmer
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
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avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_getsync(): timeout communicating with programmer
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_getsync(): timeout communicating with programmer
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_getsync(): timeout communicating with programmer
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
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Title: Re: power outage recovery using DS1307 Real Time Clock
Post by: PaulS on Jan 22, 2013, 06:32 pm
Does commenting out just the Serial.print() statement make a difference? Does uncommenting that one, and commenting another make a difference?
Title: Re: power outage recovery using DS1307 Real Time Clock
Post by: urthlight on Jan 22, 2013, 06:35 pm
Strangely yes commenting out the serial print statement did work.
????
Any Idea as to why this should act so?
Title: Re: power outage recovery using DS1307 Real Time Clock
Post by: urthlight on Jan 26, 2013, 03:45 am
Hello???
Title: Re: power outage recovery using DS1307 Real Time Clock
Post by: urthlight on Jan 30, 2013, 12:58 am
"crickets"
Title: Re: power outage recovery using DS1307 Real Time Clock
Post by: urthlight on Feb 02, 2013, 12:04 am
As it turns out !!! is the culprit.
Quote
Actually all arduino mega1280 and mega2560 boards both past and present suffer from the !!! bootloader monitor 'bug'. Doesn't matter what version board or version of IDE, the only fix is to upgrade the bootloader to one that has fixes that and other shortcomings of that bootloader.

Lefty


 

Title: Re: power outage recovery using DS1307 Real Time Clock
Post by: CrossRoads on Feb 02, 2013, 12:52 am
PaulS, you could not have just mentioned that???

//  Serial.print (" Write Error!!!");
Title: Re: power outage recovery using DS1307 Real Time Clock
Post by: PaulS on Feb 02, 2013, 04:29 pm
Quote
PaulS, you could not have just mentioned that???

I guess I could have,,, if I'''d read the whole statement,,, and seen that the statement contained data that was likely to cause problems...

The initial post said that commenting out three statements was required,,, to make the code upload. I was interested in finding out which of the three was the culprit...

As you can see from my reply, three punctuation marks in a row contribute nothing to the information. I don't understand why people feel it necessary to send more data than is necessary.
Title: Re: power outage recovery using DS1307 Real Time Clock
Post by: urthlight on Feb 04, 2013, 08:51 pm
Quote
I don't understand why people feel it necessary to send more data than is necessary.

What is not necessary?