FloppyDiskCast.ino

#include "ff.h"
#include "ArduinoFDC.h"
#include "floppyfuncs.h"
#include "LowPower.h"


static FIL   FatFsFile;

const int wakeUpPin = 2;
const int espRSTPin = A0;
const int powerEnable5VPin = A1;
const int espToArduinoPin = A3;
const int arduinoToEspPin = A4;

void wakeUp()
{
    // Just a handler for the pin interrupt.
}

void setup() {
  pinMode(wakeUpPin, INPUT_PULLUP);
  //pinMode(espRSTPin, INPUT);
  pinMode(powerEnable5VPin, OUTPUT);
  digitalWrite(powerEnable5VPin, 0);

  pinMode(espToArduinoPin, INPUT);
  pinMode(arduinoToEspPin, INPUT);
  
  Serial.begin(115200);
}

void resetESP() {
  digitalWrite(espRSTPin, LOW);
  pinMode(espRSTPin, OUTPUT);
  delay(10);
  pinMode(espRSTPin, INPUT);
  delay(500);
}

bool isESPSleeping() {
  return digitalRead(espToArduinoPin);
}

void resetESP_ifNeeded() {
  if (isESPSleeping()) {
    resetESP();
  }
}

void sleep_untilInterrupt() {
  LowPower.powerDown(SLEEP_FOREVER, ADC_OFF, BOD_OFF); 
}

UINT readFileNoPrint(char *fname) {
  UINT count;
  FRESULT fr;
  
  ArduinoFDC.motorOn();
  fr = f_open(&FatFsFile, fname, FA_READ);
  if( fr == FR_OK )
    {
      count = 1;
      //TODO: at one point need to simplify code to not overflow TEMPBUFFER
      //while( count>0 )
        {
          fr = f_read(&FatFsFile, tempbuffer, TEMPBUFFER_SIZE, &count);
          /*if( fr == FR_OK )
            Serial.write(tempbuffer, count);
          else
            print_ff_error(fr);*/
        }
      f_close(&FatFsFile);
      return count;
    }
  else
    print_ff_error(fr);
}

void loop() {
  UINT count = 0;
  
  //Wait for disk
  //NOTE: PIN34 could be hooked up; https://en.wikipedia.org/wiki/Floppy_disk_drive_interface
  //      however, in practice it never is. So jerry-rig a switch instead.
  
  // Allow wake up pin to trigger interrupt on low.
  attachInterrupt(0, wakeUp, LOW); // 0 = pin D2
  sleep_untilInterrupt();
  detachInterrupt(0);

  //Disk in, power up stuff
  resetESP_ifNeeded();
  
  //XXX, determine needed delay
  delay(50);
  Serial.println("diskin\n");
  Serial.print("\n");
  Serial.flush();
  delay(50);

  digitalWrite(powerEnable5VPin, 1);
  delay(500);


  ArduinoFDC.begin(ArduinoFDCClass::DT_3_HD, ArduinoFDCClass::DT_3_HD);
  f_mount(&FatFs, "0:", 0);

  //Debug purposes:
  //listDir();

  
  
  //Read autoexec.sh
  count = readFile("autoexec.sh"); //also prints on serial
  //Send contents over UDP broadcast WIFI, assuming network is hooked up on Serial
  //Serial.write(tempbuffer, count);
  Serial.print("\n");
  Serial.flush();
  
  //Read diskmelo.dy
  count = readFileNoPrint("diskmelo.dy");

  //Play melody using floppy drive
  //TODO

  // Move head a couple of tracks, to protect track0
  ArduinoFDC.readSector(20, 0, 1, tempbuffer);
  
  ArduinoFDC.motorOff();
  delay(50);
  ArduinoFDC.end();
  delay(200);
  digitalWrite(powerEnable5VPin, 0);

  //If disk is still in, wait for it to be ejected
  if (digitalRead(wakeUpPin) == LOW) {
    attachInterrupt(0, wakeUp, RISING);
    sleep_untilInterrupt();
    detachInterrupt(0);
  }
  
  resetESP_ifNeeded();
  Serial.println("diskout\n");
  Serial.print("\n");
  Serial.flush();
  //debounce the switch a bit
  delay(50);
}