Arduino로 플로피 디스크 드라이브 제어

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Arduino Uno로 3.5 "플로피 디스크 드라이브를 제어하는 ​​데 문제가 있습니다.

플로피 디스크 드라이브에 전원이 켜진 컴퓨터 전원 공급 장치로 전원을 공급하고 Arduino에 내 컴퓨터의 USB로 전원이 공급됩니다. 핀을 Arduino로 라우팅 할 수 있도록 34 핀 IDC 커넥터의 리본을 분리했습니다. 플로피 디스크 모터를 켜고 읽기 / 쓰기 헤드를 앞뒤로 움직일 수는 있지만 Track-0 또는 Index 핀에서 펄스를 읽을 수는 없습니다.

플로피의 핀 7, 15, 17, 19 및 25가 모두 Arduino에 접지되어 있으며 플로피의 핀 8, 16, 18, 20 및 26이 출력 핀으로 arduino에 연결되어 있으므로 제어 할 수 있습니다 운전.

디스크 모터가 회전 할 때 색인이 펄스 화되고 디스크 외부에있을 때 트랙 0이 변경 될 것으로 예상하지만 둘 다 항상 낮습니다. 뭔가 빠졌습니까?

다음은 플로피 디스크 장치의 뒷면에 대한 사양입니다

    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

여기에 내가 연결 한 것의 개략도 (이 회로도의 브레드 보드는 3.5 "플로피 드라이브에 연결된 IDC 커넥터를 나타냅니다.)

플로피 및 아두 이노 연결

다음은 IDC 커넥터 사진이며 Arduino에 연결된 전선에 레이블이 붙어 있습니다.

라벨이 부착 된 IDC 커넥터

여기 내가 실행중인 코드가 있습니다.

//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);
}

내가 얻는 결과는 다음과 같습니다. 

 Index:0 Track:0 Setup done.
 Index:0 Track:0 Begin to spin motor
 Index:0 Track:0 Spinning
 Index:0 Track:0 Spinning
 Index:0 Track:0 Spinning
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 Index:0 Track:0 Done spinning motor
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 Index:0 Track:0 Begin to spin motor
 Index:0 Track:0 Spinning
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 Index:0 Track:0 Begin to spin motor
 Index:0 Track:0 Spinning
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 Index:0 Track:0 Done spinning motor
 Index:0 Track:0 beginning to wait for index pin to pulse

업데이트 : geometrikal의 답변으로 인해 예상 한 결과가 나타납니다. 이 문제를 연구하는 동안 Arduino에서 Floppy Drive 로의 몇 가지 코드 예제를 발견했습니다. 나는 그들이 입력 핀을 HIGH로 설정하고 있음을 알아 차 렸지만 왜 그들이 이것을하고 있는지는 알지 못했다. 내 문제를 해결 한 후 일부 Arduino 설명서에서이를 발견했습니다 (이전 버전의 Arduino IDE를 사용하고있는 코드 예제를 깨달았습니다).

"Arduino 1.0.1 이전에는 다음과 같은 방식으로 내부 풀업을 구성 할 수있었습니다."

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

Arduino 1.0.1 이상에서는 이렇게 할 수 있습니다.

pinMode(pin, INPUT_PULLUP);
arduino-uno  hardware 
— 제프 타운
소스
풀업 작업을 가능하게하는 두 가지 방법. INPUT_PULLUP 핀 모드를 사용하는 두 번째 방법은 1 줄을 더 적게 사용하고 읽기가 훨씬 쉽기 때문에 더 좋습니다.
— Duncan C

답변:

10

이것에 따르면 (죽은 링크) :

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

FD1035 3.5 "플로피 디스크 드라이브 의 아카이브 사본입니다 . 제품 설명 1984 년 7 월-PDF :

https://archive.org/details/bitsavers_necFD1035Pl84_876629

출력은 오픈 컬렉터이므로 풀업 저항이 필요합니다. 대신 해당 핀에서 Arduino 내부 풀업을 활성화 할 수 있습니다

pinMode(indexPin, INPUT_PULLUP);
pinMode(track0Pin, INPUT_PULLUP);
— 지오메트리
소스
고마워요 이것이 바로 내가 필요한 것입니다.
— jeffctown
3

당신은 교체해야합니다 int으로 unsigned long당신이 시간 (밀리 초)을 다루는 모든 위치한다.

요점은을 millis()반환 unsigned long하므로 값 int을 저장 하는 데 사용 millis()하면 컴파일러에서 자동 캐스트로 인해 정보가 손실됩니다.

수행해야 할 변경 사항은 다음과 같습니다.

unsigned long motorSpinTime = 1000UL; //in ms

과:

//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);
}

또한 최대 시간을 한 번 계산 한 다음 millis()해당 값 과 직접 비교하여 대기 루프에서 일부 최적화를 수행했습니다 . 이것은 필수는 아니지만 조금 더 깨끗합니다.

— jfpoilpret
소스
대단하다! 불행히도이 코드를 변경해도 내가받는 예기치 않은 출력이 수정되지는 않습니다. 색인 및 트랙 0 핀에 대해 여전히 0을 모두 받고 있습니다. 나는 여전히 충격을 받았다. 나는 아마도 드라이브가 나쁘다고 말하지만이 프로젝트를 위해 2 개의 3.5 인치 플로피 드라이브를 구입했으며 두 드라이브 모두 동일한 출력을 얻습니다 (둘 다 나쁠 수 있지만 그 가능성은 무엇입니까?).
— jeffctown
이것은 잠재적으로 중요하지만 어떤 식 으로든 질문에 대답하지는 않으므로 주석으로 작성해야 할 요점 유형도 마찬가지입니다.
— Chris Stratton
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