Sto riscontrando problemi nel controllo di un'unità disco floppy da 3,5 "con un Arduino Uno.
Ho il floppy disk alimentato con un alimentatore per computer acceso e Arduino alimentato dall'USB del mio computer. Ho tagliato il nastro di un connettore IDC a 34 pin per poter instradare i pin al mio Arduino. Sono in grado di accendere il motore del floppy disk e spostare avanti e indietro la testina di lettura / scrittura, ma non sono mai in grado di leggere alcun impulso dai pin Track-0 o Index.
Ho i pin 7, 15, 17, 19 e 25 del floppy tutti collegati a terra sul mio Arduino e ho i pin 8, 16, 18, 20 e 26 del floppy collegati al mio arduino come pin di uscita in modo da poter controllare la guida.
Mi aspetto che l'Indice pulsi quando il motore del disco fa una rotazione e che la Traccia 0 cambi quando mi trovo all'esterno del disco, ma entrambi sono sempre BASSI. Mi sto perdendo qualcosa?
Ecco le specifiche che ho trovato per il retro dell'unità floppy
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
Ecco uno schema di ciò che ho collegato (La breadboard in questo schema circuitale rappresenta il connettore IDC che è collegato all'unità floppy da 3,5 ".)
Ecco una foto del connettore IDC e ho etichettato quali fili sono collegati ad Arduino.
Ecco il codice che sto eseguendo.
//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);
}
Ecco l'output che sto ottenendo.
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
Index:0 Track:0 Stepping In
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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
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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
AGGIORNAMENTO: ora sto ricevendo i risultati attesi grazie alla risposta di geometrikal. Durante la ricerca di questo problema ho trovato alcuni esempi di codice di Arduino su Floppy Drive. Ho notato che stavano impostando i loro pin di input su HIGH, ma non ho mai capito perché lo stessero facendo. Dopo aver risolto il mio problema, l'ho trovato in alcuni documenti di Arduino (che mi hanno fatto capire gli esempi di codice che avevo usando una versione precedente dell'IDE Arduino):
"Prima di Arduino 1.0.1, era possibile configurare i pull-up interni nel modo seguente:"
pinMode(pin, INPUT); // set pin to input
digitalWrite(pin, HIGH); // turn on pullup resistors`
In Arduino 1.0.1+ puoi farlo in questo modo.
pinMode(pin, INPUT_PULLUP);