OK, I am having all sorts of issues, and do not know how fix it. I've now spent a total of 18 hours trying to get this to work, and I'm ready to microwave something.
All I want to do is use the following code with an ISR to read and display the time from the DS3231 into the Serial Monitor, if a button is pressed.
#include "Wire.h"
#define DS3231_I2C_ADDRESS 0x68
const int BUTTON = 2; //pin # of the pushbutton
volatile int buttonState = 0;
// 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()
{
pinMode(BUTTON, INPUT);
attachInterrupt(digitalPinToInterrupt(2), pin_ISR, FALLING);
Wire.begin();
Serial.begin(9600);
// set the initial time here:
// DS3231 seconds, minutes, hours, day, date, month, year
// setDS3231time(25,55,21,3,14,11,17);
}
void setDS3231time(byte second, byte minute, byte hour, byte dayOfWeek, byte
dayOfMonth, byte month, byte year)
{
// sets time and date data to DS3231
Wire.beginTransmission(DS3231_I2C_ADDRESS);
Wire.write(0); // set next input to start at the seconds register
Wire.write(decToBcd(second)); // set seconds
Wire.write(decToBcd(minute)); // set minutes
Wire.write(decToBcd(hour)); // set hours
Wire.write(decToBcd(dayOfWeek)); // set day of week (1=Sunday, 7=Saturday)
Wire.write(decToBcd(dayOfMonth)); // set date (1 to 31)
Wire.write(decToBcd(month)); // set month
Wire.write(decToBcd(year)); // set year (0 to 99)
Wire.endTransmission();
}
void readDS3231time(byte *second,
byte *minute,
byte *hour,
byte *dayOfWeek,
byte *dayOfMonth,
byte *month,
byte *year)
{
Wire.beginTransmission(DS3231_I2C_ADDRESS);
Wire.write(0); // set DS3231 register pointer to 00h
Wire.endTransmission();
Wire.requestFrom(DS3231_I2C_ADDRESS, 7);
// request seven bytes of data from DS3231 starting from register 00h
*second = bcdToDec(Wire.read() & 0x7f);
*minute = bcdToDec(Wire.read());
*hour = bcdToDec(Wire.read() & 0x3f);
*dayOfWeek = bcdToDec(Wire.read());
*dayOfMonth = bcdToDec(Wire.read());
*month = bcdToDec(Wire.read());
*year = bcdToDec(Wire.read());
}
void displayTime()
{
byte second, minute, hour, dayOfWeek, dayOfMonth, month, year;
// retrieve data from DS3231
readDS3231time(&second, &minute, &hour, &dayOfWeek, &dayOfMonth, &month,
&year);
// send it to the serial monitor
Serial.print(hour, DEC);
// convert the byte variable to a decimal number when displayed
Serial.print(":");
if (minute < 10)
{
Serial.print("0");
}
Serial.print(minute, DEC);
Serial.print(":");
if (second < 10)
{
Serial.print("0");
}
Serial.print(second, DEC);
Serial.print(" ");
Serial.print(dayOfMonth, DEC);
Serial.print("/");
Serial.print(month, DEC);
Serial.print("/");
Serial.print(year, DEC);
Serial.print(" Day of week: ");
switch (dayOfWeek) {
case 1:
Serial.println("Sunday");
break;
case 2:
Serial.println("Monday");
break;
case 3:
Serial.println("Tuesday");
break;
case 4:
Serial.println("Wednesday");
break;
case 5:
Serial.println("Thursday");
break;
case 6:
Serial.println("Friday");
break;
case 7:
Serial.println("Saturday");
break;
}
}
void pin_ISR()
{
displayTime();
}
void loop()
{
Serial.println("5");
delay(5000);
Serial.println("10");
delay(5000);
Serial.println("15");
delay(5000);
Serial.println("20");
delay(5000);
Serial.println("25");
delay(5000);
Serial.println("30");
delay(5000);
Serial.println("35");
delay(5000);
Serial.println("40");
delay(5000);
Serial.println("45");
delay(5000);
Serial.println("50");
}
Here's what I run into. If I put ANYTHING and I mean anything into the ISR section of my code, it messes up.
void pin_ISR()
{
}
My output on the serial monitor freezes up. I've tried RISING, FALLING, CHANGE and LOW
I've tried adding the following code and I still have the same issue
void pin_ISR()
{
buttonState = digitalRead(BUTTON);
if (buttonState == HIGH)
{ displayTime();
}
What am I doing wrong?
