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Topic: Help Ending an Infinite Loop in Fingerprint Sensor Code (Read 352 times) previous topic - next topic

seismicarc

Hello all,

I'm trying to use a fingerprint sensor in one of my projects. I want the user to be prompted to enter their fingerprint in the beginning of the set up process.
I am trying to tinker around with the Enroll code of the Fingerprint sensor but haven't been able to end the infinite loop. I have stopped the infinite loop by placing the code in a subroutine called FingerprintReady(). Now, the problem is that I want the code to continue until a trigger occurs after "Stored" is displayed in the serial monitor .


Any help is really appreciated! Thank you. If necessary I am willing to pay at this point because I have spent many hours trying to figure out the errors I have made.

Here is my modified code. I have created the subroutine FingerprintReady() and wish to have it continue until fingerprints have been stored! I think I have to return a value, for instance p, discover what that value is in the case when fingerprints are stored! and have the while loop continue while( p != 0) for example.

Code: [Select]


/***************************************************
  This is an example sketch for our optical Fingerprint sensor

  Designed specifically to work with the Adafruit BMP085 Breakout
  ----> http://www.adafruit.com/products/751

  These displays use TTL Serial to communicate, 2 pins are required to
  interface
  Adafruit invests time and resources providing this open source code,
  please support Adafruit and open-source hardware by purchasing
  products from Adafruit!

  Written by Limor Fried/Ladyada for Adafruit Industries.
  BSD license, all text above must be included in any redistribution
 ****************************************************/

#include <Adafruit_Fingerprint.h>
#include <SoftwareSerial.h>

uint8_t id;

uint8_t getFingerprintEnroll();

// Software serial for when you dont have a hardware serial port
// pin #2 is IN from sensor (GREEN wire)
// pin #3 is OUT from arduino  (WHITE wire)
// On Leonardo/Micro/Yun, use pins 8 & 9. On Mega, just grab a hardware serialport
SoftwareSerial mySerial(2, 3);
Adafruit_Fingerprint finger = Adafruit_Fingerprint(&mySerial);

// On Leonardo/Micro or others with hardware serial, use those! #0 is green wire, #1 is white
//Adafruit_Fingerprint finger = Adafruit_Fingerprint(&Serial1);


void setup()
{
  while (!Serial);  // For Yun/Leo/Micro/Zero/...
  delay(500);

  Serial.begin(9600);
  Serial.println("Adafruit Fingerprint sensor enrollment");

  // set the data rate for the sensor serial port
  finger.begin(57600);

  if (finger.verifyPassword()) {
    Serial.println("Found fingerprint sensor!");
  } else {
    Serial.println("Did not find fingerprint sensor :(");
    while (1);
  }
  FingerprintReady(); //calls subroutine *********
}

uint8_t readnumber(void) {
  uint8_t num = 0;
  boolean validnum = false;
  while (1) {
    while (! Serial.available());
    char c = Serial.read();
    if (isdigit(c)) {
      num *= 10;
      num += c - '0';
      validnum = true;
    } else if (validnum) {
      return num;
    }
  }
}

void loop()                     // run over and over again
{
}


void FingerprintReady() //this subroutine is only ran ONCE currently
{
  uint8_t check = 0;
//  while (check != 1)  *** if uncommented, code will continue forever as well. I want this to be triggered below
  {
    {
      Serial.println("Ready to enroll a fingerprint! Please Type in the ID # you want to save this finger as...");
      id = readnumber();
      Serial.print("Enrolling ID #");
      Serial.println(id);

      while (!  getFingerprintEnroll());  //My understanding is the function getFingerprintEnroll will run when the id != getFingerprintEnroll;
    }
  }
}

uint8_t getFingerprintEnroll() {
  uint8_t check;

  int p = -1;
  Serial.print("Waiting for valid finger to enroll as #"); Serial.println(id);
  while (p != FINGERPRINT_OK) {
    p = finger.getImage();
    Serial.println(p);
    switch (p) {
      case FINGERPRINT_OK:
        Serial.println("Image taken");
        break;
      case FINGERPRINT_NOFINGER:
        Serial.println(".");
        break;
      case FINGERPRINT_PACKETRECIEVEERR:
        Serial.println("Communication error");
        break;
      case FINGERPRINT_IMAGEFAIL:
        Serial.println("Imaging error");
        break;
      default:
        Serial.println("Unknown error");
        break;
    }
  }

  // OK success!

  p = finger.image2Tz(1);
  switch (p) {
    case FINGERPRINT_OK:
      Serial.println("Image converted");
      break;
    case FINGERPRINT_IMAGEMESS:
      Serial.println("Image too messy");
      return p;
    case FINGERPRINT_PACKETRECIEVEERR:
      Serial.println("Communication error");
      return p;
    case FINGERPRINT_FEATUREFAIL:
      Serial.println("Could not find fingerprint features");
      return p;
    case FINGERPRINT_INVALIDIMAGE:
      Serial.println("Could not find fingerprint features");
      return p;
    default:
      Serial.println("Unknown error");
      return p;
  }

  Serial.println("Remove finger");
  delay(2000);
  p = 0;
  while (p != FINGERPRINT_NOFINGER) {
    p = finger.getImage();
  }
  Serial.print("ID "); Serial.println(id);
  p = -1;
  Serial.println("Place same finger again");
  while (p != FINGERPRINT_OK) {
    p = finger.getImage();
    switch (p) {
      case FINGERPRINT_OK:
        Serial.println("Image taken");
        break;
      case FINGERPRINT_NOFINGER:
        Serial.print(".");
        break;
      case FINGERPRINT_PACKETRECIEVEERR:
        Serial.println("Communication error");
        break;
      case FINGERPRINT_IMAGEFAIL:
        Serial.println("Imaging error");
        break;
      default:
        Serial.println("Unknown error");
        break;
    }
  }

  // OK success!

  p = finger.image2Tz(2);
  switch (p) {
    case FINGERPRINT_OK:
      Serial.println("Image converted");
      break;
    case FINGERPRINT_IMAGEMESS:
      Serial.println("Image too messy");
      return p;
    case FINGERPRINT_PACKETRECIEVEERR:
      Serial.println("Communication error");
      return p;
    case FINGERPRINT_FEATUREFAIL:
      Serial.println("Could not find fingerprint features");
      return p;
    case FINGERPRINT_INVALIDIMAGE:
      Serial.println("Could not find fingerprint features");
      return p;
    default:
      Serial.println("Unknown error");
      return p;
  }

  // OK converted!
  Serial.print("Creating model for #");  Serial.println(id);

  p = finger.createModel();
  if (p == FINGERPRINT_OK) {
    Serial.println("Prints matched!");
  } else if (p == FINGERPRINT_PACKETRECIEVEERR) {
    Serial.println("Communication error");
    return p;
  } else if (p == FINGERPRINT_ENROLLMISMATCH) {
    Serial.println("Fingerprints did not match");
    return p;
  } else {
    Serial.println("Unknown error");
    return p;
  }

  Serial.print("ID "); Serial.println(id);
  p = finger.storeModel(id);
  if (p == FINGERPRINT_OK) {
    Serial.println("Stored! ");
    Serial.println(p);
    check = 1; //************ where the trigger must occur and be returned to the FingerprintReady subroutine
    return check;
  } else if (p == FINGERPRINT_PACKETRECIEVEERR) {
    Serial.println("Communication error");
    return p;
  } else if (p == FINGERPRINT_BADLOCATION) {
    Serial.println("Could not store in that location");
    return p;
  } else if (p == FINGERPRINT_FLASHERR) {
    Serial.println("Error writing to flash");
    return p;
  } else {
    Serial.println("Unknown error");
    return p;
  }
}

pert

Cross-posted from http://forum.arduino.cc/index.php?topic=435455. Please don't do that! It wastes time due to duplicated effort of people trying to help you.

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