RTC is hanging problem with msp

[ajitnayak]

View attachment RTC.zipDear all,

I am using Ds1307 with MSPg430 kit and Energia as IDE which work similar to Arduino IDE.When i connect RTC pin i.e sda and scl they seems working.when i removed the program get hangs. If connected back it starts working fine.

Please let me know whether this behavior is normal or abnormal for MSP kits.

#include <Wire.h>


#define DS1307_ADDRESS 0x68
byte zero = 0x00; //workaround for issue #527

int s ;
int m ;
  int h;
  int w;
  int dd;
  int mm;
  int yy;



void setup(){
  Wire.begin();
 
  Serial.begin(9600);
  setDateTime(); //MUST CONFIGURE IN FUNCTION
}

void loop(){

  Serial.println("Welcome to MSP main program");
  getdate();
 printDate();
 Serial.println("read data from RTC");
 delay(1000);
 Serial.println("leaving the main");
  
}

void setDateTime(){

  byte second =45; //0-59
  byte minu =11; //0-59
  byte hour =13; //0-23
  byte weekday=2;
  byte monthDay =19; //1-31
  byte month =3; //1-12
  byte year  =13; //0-99



  Wire.beginTransmission(DS1307_ADDRESS);

  Wire.write(zero); //stop Oscillator

  Wire.write(decToBcd(second));
  Wire.write(decToBcd(minu));
  Wire.write(decToBcd(hour));
  Wire.write(decToBcd(weekday));
  Wire.write(decToBcd(monthDay));
  Wire.write(decToBcd(month));
  Wire.write(decToBcd(year));

  Wire.write(zero); //start

  Wire.endTransmission();

}

byte decToBcd(byte val){
  // Convert normal decimal numbers to binary coded decimal
  return ( (val/10*16) + (val%10) );
}

byte bcdToDec(byte val)  {
  // Convert binary coded decimal to normal decimal numbers
  return ( (val/16*10) + (val%16) );
}


void getdate()
{
  
  Wire.beginTransmission(DS1307_ADDRESS);

  Wire.write(0);
  Wire.endTransmission();

  Wire.requestFrom(DS1307_ADDRESS,7);

s = bcdToDec(Wire.read());
 m = bcdToDec(Wire.read());
h = bcdToDec(Wire.read() & 0b111111); //24 hour time
w=bcdToDec(Wire.read());
dd= bcdToDec(Wire.read());
mm= bcdToDec(Wire.read());
yy = bcdToDec(Wire.read());
}


void printDate(){

  
  Serial.print(dd);
  Serial.print("/");


  Serial.print(mm);
  Serial.print("/");

  Serial.print(yy);
  Serial.print(" ");
  Serial.print(h);
  Serial.print(":");
  Serial.print(m);
  Serial.print(":");
  Serial.println(s);

}

 

[dheena]

seems the program needs to get ACK from RTC and if it wont get any ACK it just hang on into a infinite loop...so modify your coding as like that...