void DCF77::appendSignal(unsigned char signal) {
#ifdef DCF_DEBUG
Serial.print(", appending value ");
Serial.print(signal);
Serial.print(" at position ");
Serial.println(bufferPosition);
#endif
dcf_rx_buffer = dcf_rx_buffer | ((unsigned long long) signal << bufferPosition);
bufferPosition++;
if (bufferPosition > 59) {
finalizeBuffer();
}
}
/* *
* Append a signal to the dcf_rx_buffer. Argument can be 1 or 0. An internal
* counter shifts the writing position within the buffer. If position > 59,
* a new minute begins -> time to call finalizeBuffer().
*/
void appendSignal(uint8_t signal) {
dcf_rx_buffer = dcf_rx_buffer | ((unsigned long long) signal << bufferPosition);
// Update the parity bits. First: Reset when minute, hour or date starts.
if (bufferPosition == 21 || bufferPosition == 29 || bufferPosition == 36) { flags.parity_flag = 0; }
// Save the parity when the corresponding segment ends
if (bufferPosition == 28) { flags.parity_min = flags.parity_flag; };
if (bufferPosition == 35) { flags.parity_hour = flags.parity_flag; };
if (bufferPosition == 58) { flags.parity_date = flags.parity_flag; };
// When we received a 1, toggle the parity flag
if (signal == 1) { flags.parity_flag = flags.parity_flag ^ 1; }
bufferPosition++;
if (bufferPosition > 59) { finalizeBuffer(); }
}
/**
* Evaluates the signal as it is received.
*/
void scanSignal(void) {
if (DCFSignalState == 1) {
int thisFlankTime = millis();
if (thisFlankTime - previousFlankTime > DCF_sync_millis) {
finalizeBuffer();
} else if (thisFlankTime - previousFlankTime < 300) {
bufferPosition--;
if (bufferPosition < 0) bufferPosition = 0;
}
if (thisFlankTime - previousFlankTime > 300) {
previousFlankTime = thisFlankTime;
}
} else {
int difference = millis() - previousFlankTime;
if (difference < DCF_split_millis) {
appendSignal(0);
} else {
appendSignal(1);
}
}
}
int DCF77::scanSignal(void){
unsigned char DCFsignal = digitalRead(DCF77Pin);
if (DCFsignal != previousSignalState) {
if (DCFsignal == 1) {
/* We detected a raising flank, increase per one second! */
addSecond();
#ifdef DCF_DEBUG
serialDumpTime();
#endif
int thisFlankTime=millis();
if (thisFlankTime - previousFlankTime > DCF_sync_millis) {
#ifdef DCF_DEBUG
Serial.println("####");
Serial.println("#### Begin of new Minute!!!");
Serial.println("####");
#endif
finalizeBuffer();
}
previousFlankTime=thisFlankTime;
#ifdef DCF_DEBUG
Serial.print(previousFlankTime);
Serial.print(": DCF77 Signal detected, ");
#endif
} else {
/* or a falling flank */
int difference=millis() - previousFlankTime;
#ifdef DCF_DEBUG
Serial.print("duration: ");
Serial.print(difference);
#endif
if (difference < DCF_split_millis) {
appendSignal(0);
} else {
appendSignal(1);
}
}
previousSignalState = DCFsignal;
}
return DCFsignal;
}