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RTC_ReadTime.cpp
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RTC_ReadTime.cpp
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// Do not remove the include below
#include "RTC_ReadTime.h"
// RAM-specific variables to keep track within the interrupts
volatile unsigned long buttonCurTime = 0;
volatile unsigned long buttonLastTime = 0;
volatile boolean changeState = false;
//The setup function is called once at startup of the sketch
void setup() {
pinMode(A2,OUTPUT);
pinMode(A3,OUTPUT);
digitalWrite(A2,LOW); // Turn on the ground for the DS1307
digitalWrite(A3,HIGH);// Turn on the +5vcc for the DS1307
// Enable the AIN0 comparator interrupt (called with the ISR(ANALOG_COMP_vect) function below)
ACSR = (0 << ACD) | // Analog Comparator Enabled
(0 << ACBG) | // Analog Comparator Bandgap Select: AIN0 is applied to the positive input
(0 << ACO) | // Analog Comparator Output: Off
(1 << ACI) | // Analog Comparator Interrupt Flag: Clear Pending Interrupt
(1 << ACIE) | // Analog Comparator Interrupt: Enabled
(0 << ACIC) | // Analog Comparator Input Capture: Disabled
(1 << ACIS1) | (0 << ACIS0); // Analog Comparator Interrupt Mode: Comparator Interrupt on Falling Output Edge
Serial.begin(115200);
while (!Serial)
; // wait for Arduino Serial Monitor
delay(200);
setSyncProvider(RTC.get);
if (timeStatus() != timeSet) {
Serial.println("Unable to sync with the RTC");
} else {
Serial.println("RTC has set the system time");
}
}
// The loop function is called in an endless loop
void loop() {
// if(changeState){
// Serial.println("Adding one (1) second to DC1307 time.");
// long addSomeTime = 1;
// adjustTime(addSomeTime);
// RTC.set(now()); // Try to write the new time to the DS1307
// changeState = false;
// }
digitalClockDisplay();
delay(100);
}
// Function for the AIN0 interrupt; need to keep all the variables as volatile, can't really call other functions
ISR(ANALOG_COMP_vect) {
buttonCurTime = millis();
//check to see if the interrupt was called in the last 250 milliseconds
if (abs(buttonCurTime - buttonLastTime) > 250) {
buttonLastTime = buttonCurTime;
// Call our interrupt function
btnInterrupt();
}
}
void btnInterrupt(){
changeState = true;
}
void digitalClockDisplay(){
// digital clock display of the time
Serial.print(year());
Serial.print("-");
print2digits(month());
Serial.print("-");
print2digits(day());
Serial.print(" ");
Serial.print(hour());
Serial.print(":");
print2digits(minute());
Serial.print(":");
print2digits(second());
Serial.println();
}
void print2digits(int number) {
if (number >= 0 && number < 10) {
Serial.write('0');
}
Serial.print(number);
}