Arduino ile Disket Sürücüsünü Denetleme

Bir Arduino Uno ile 3.5 "Disket Sürücü kontrol sorunları yaşıyorum.

Açık olan bir bilgisayar güç kaynağı ile çalışan disket sürücüm ve bilgisayarımın USB'si ile çalışan Arduino var. Pimleri Arduino'uma yönlendirebilmek için 34 pimli bir IDC konnektörünün şeridini kestim. Disket motorunu açabilir ve okuma / yazma kafasını ileri geri hareket ettirebilirim, ancak Track-0 veya Index pimlerinden hiçbir darbeyi okuyamam.

Disketten Arduino'ma topraklanmış 7, 15, 17, 19 ve 25 pinleri var ve çıkış pinleri olarak arduinoma bağlı disketten 8, 16, 18, 20 ve 26 pinleri var, böylece kontrol edebiliyorum sürüş.

Disk motoru döndürdüğünde Dizin'in yanıp sönmesini ve Disk 0'ın diskin dışındayken değişmesini bekliyorum, ancak ikisi de her zaman DÜŞÜK. Bir şey mi kaçırıyorum?

İşte disket ünitesinin arkası için bulduğum özellik

    2   /REDWC  Input Density Select
    4   n/c N/A Reserved
    6   n/c N/A Reserved
    8   /INDEX  Output Index
    10  /MOTEA  Input Motor Enable A 
    12  /DRVSB  Input Drive Sel B
    14  /DRVSA  Input Drive Sel A 
    16  /MOTEB  Input Motor Enable B
    18  /DIR    Input Direction
    20  /STEP   Input Step 
    22  /WDATE  Input Write Data
    24  /WGATE  Input Floppy Write Enable
    26  /TRK00  Output Track 0
    28  /WPT    Output Write Protect
    30  /RDATA  Output Read Data
    32  /SIDE1  Input  Head Select
    34  /DSKCHG Output Disk Change/Ready

Burada bağladıklarımın bir şeması ( Bu devre şemasındaki çalışma tahtası, 3.5 "disket sürücüsüne takılan IDC konektörünü temsil eder.)

İşte IDC Konnektörünün bir fotoğrafı ve Arduino'ya hangi tellerin bağlı olduğunu etiketledim.

İşte çalıştırdığım kod.

//constants
static const int IN = LOW;
static const int OUT = HIGH;
static const int pulseDelayTime = 6;

//pins
int indexPin = 2; //8 on the drive INDEX
int track0Pin = 3; //26 on the drive. TRACK 0
int dirPin = 6; //18 on the drive. DIRECTION
int stepPin = 7; //20 on the drive. STEP
int motorEnableBPin = 9; //16 on the drive. MOTOR ENABLE B

unsigned long motorSpinTime = 1000UL; //in ms


void setup() {

  //initial delay
  delay(3000);

  //setup serial monitor
  Serial.begin(9600);      

  //setup pins.
  pinMode(dirPin, OUTPUT);
  pinMode(stepPin, OUTPUT);
  pinMode(motorEnableBPin, OUTPUT);
  pinMode(indexPin, INPUT);
  pinMode(track0Pin, INPUT);

  //turn the motor off initially
  digitalWrite(motorEnableBPin, HIGH);

  //print state here.
  printState("Setup done.");

  //spin the disk some.
  printState("Begin to spin motor");
  spinMotorForThisManyMs(motorSpinTime);
  spinMotorForThisManyMs(motorSpinTime);
  printState("Done spinning motor");

  //step read/write head all the way in.
  stepAllTheWayIn();

  //spin the disk some more.
  printState("Begin to spin motor");
  spinMotorForThisManyMs(motorSpinTime);
  spinMotorForThisManyMs(motorSpinTime);
  printState("Done spinning motor");

  //step read/write head all the way out.
  stepAllTheWayOut();

  //spin the disk even more.
  printState("Begin to spin motor");
  spinMotorForThisManyMs(motorSpinTime);
  spinMotorForThisManyMs(motorSpinTime);
  printState("Done spinning motor");

  //never completes.
  waitForIndex();
}

void loop() {
}

//spins the disk motor for a number of ms and prints the state
void spinMotorForThisManyMs(unsigned long msToSpin) {

  //start spinning
  digitalWrite(motorEnableBPin,LOW);

  //delay.. keep printing the state
  unsigned long maxTimeMs = millis() + msToSpin;  
  while(millis() < maxTimeMs ) {
    printState("Spinning");    
  }

  //stop spinning
  digitalWrite(motorEnableBPin,HIGH);
}



//step the read/write head all the way to the center
void stepAllTheWayIn() {
  for(int i=0;i<100;i++) {
    printState("Stepping In");
    stepInALittle();
  }
}

//step the read/write head all the way to the outside
void stepAllTheWayOut() {
  for(int i=0;i<100;i++) {
    printState("Stepping Out");
    stepOutALittle();
  }
}

//print the state of the index and track
void printState(const char* charPrint) {
  Serial.print(" Index:");
  Serial.print(digitalRead(indexPin));
  Serial.print(" Track:");
  Serial.print(digitalRead(track0Pin));
  Serial.print(" ");
  Serial.println(charPrint);
}

//move the head towards the outside a little
void stepOutALittle() {
  digitalWrite(dirPin,HIGH);
  stepPulse();
}

//move the head towards the center a little
void stepInALittle() {
  digitalWrite(dirPin,LOW);
  stepPulse();
}

//pulse the step pin
void stepPulse() {
  digitalWrite(stepPin,LOW);
  delay(pulseDelayTime);
  digitalWrite(stepPin,HIGH);
}

//waits for the index to trigger. this never gets completed.
void waitForIndex() {

  printState("beginning to wait for index pin to pulse");

  //start spinning
  digitalWrite(motorEnableBPin,LOW);

  //wait for pulse
  while(digitalRead(indexPin));
  //wait for end of pulse 0
  while(!digitalRead(indexPin));

  printState("end of waiting for index pin to pulse");

  //stop spinning
  digitalWrite(motorEnableBPin,HIGH);
}

İşte elde ettiğim çıktı.

 Index:0 Track:0 Setup done.
 Index:0 Track:0 Begin to spin motor
 Index:0 Track:0 Spinning
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GÜNCELLEME: Şimdi geometrik cevabım nedeniyle beklenen sonuçları alıyorum. Bu sorunu araştırırken Disket Sürücü Arduino birkaç kod örnekleri bulundu. Giriş pinlerini YÜKSEK olarak ayarladıklarını fark ettim, ama bunu neden yaptıkları hiç fark etmedim. Sorunumu düzelttikten sonra, bazı Arduino belgelerinde buldum (bu bana Arduino IDE'nin eski bir sürümünü kullandığım kod örneklerini fark etmemi sağladı):

"Arduino 1.0.1'den önce dahili pull-up'ları aşağıdaki şekilde yapılandırmak mümkün oldu:"

pinMode(pin, INPUT);           // set pin to input
digitalWrite(pin, HIGH);       // turn on pullup resistors`

Arduino 1.0.1+ sürümünde bu şekilde yapabilirsiniz.

pinMode(pin, INPUT_PULLUP);

Buna göre (ölü bağlantı):

http://bitsavers.trailing-edge.com/pdf/nec/FD1035_Product_Description_Jul84.pdf

Bu, FD1035 3.5 "Disket sürücünün arşivlenmiş bir kopyasıdır : Ürün Açıklaması Temmuz 1984 - PDF :

https://archive.org/details/bitsavers_necFD1035Pl84_876629

Çıkışlar açık kollektördür, bu nedenle bir çekme direnci gereklidir. Bunun yerine bu pimlerdeki Arduino dahili pull-up'larını şu şekilde etkinleştirebilirsiniz:

pinMode(indexPin, INPUT_PULLUP);
pinMode(track0Pin, INPUT_PULLUP);

Sen değiştirmelisiniz intile unsigned longmilisaniye cinsinden zaman başa tüm bölgelerde.

Mesele şu ki millis(), bir değeri döndürerek değeri depolamak için unsigned longkullanarak , derleyici tarafından gerçekleştirilen otomatik döküm nedeniyle bilgi kaybınız olur.intmillis()

Yapmanız gereken değişiklikler:

unsigned long motorSpinTime = 1000UL; //in ms

ve:

//spins the disk motor for a number of ms and prints the state
void spinMotorForThisManyMs(unsigned long msToSpin) {

  //start spinning
  digitalWrite(motorEnableBPin,LOW);

  //delay.. keep printing the state
  unsigned long maxTimeMs = millis() + msToSpin;  
  while(millis() < maxTimeMs ) {
    printState("Spinning");    
  }

  //stop spinning
  digitalWrite(motorEnableBPin,HIGH);
}

Maksimum bekleme süresini bir kez hesaplayarak bekleme döngüsünde bazı optimizasyonlar yaptığımı ve daha sonra millis()doğrudan bu değerle karşılaştırabildiğimi unutmayın . Bu zorunlu değil ama sadece biraz daha temiz buluyorum.