Getting Started with the MKR MEM Shield

#include <SerialFlash.h>
#include <SD.h>
#include <SPI.h>

const int SDchipSelect = 4;    // Audio Shield has SD card CS on pin 10

const int FlashChipSelect = 5; // digital pin for flash chip CS pin
//const int FlashChipSelect = 21; // Arduino 101 built-in SPI Flash

void setup() {

  //uncomment these if using Teensy audio shield

  //SPI.setSCK(14);  // Audio shield has SCK on pin 14

  //SPI.setMOSI(7);  // Audio shield has MOSI on pin 7

  //uncomment these if you have other SPI chips connected

  //to keep them disabled while using only SerialFlash

  //pinMode(4, INPUT_PULLUP);

  //pinMode(10, INPUT_PULLUP);

  Serial.begin(9600);

  // wait up to 10 seconds for Arduino Serial Monitor

  unsigned long startMillis = millis();

  while (!Serial && (millis() - startMillis < 10000)) ;

  delay(100);

  Serial.println("Copy all files from SD Card to SPI Flash");

  if (!SD.begin(SDchipSelect)) {

    error("Unable to access SD card");

  }

  if (!SerialFlash.begin(FlashChipSelect)) {

    error("Unable to access SPI Flash chip");

  }

  File rootdir = SD.open("/");

  while (1) {

    // open a file from the SD card

    Serial.println();

    File f = rootdir.openNextFile();

    if (!f) break;

    const char *filename = f.name();

    Serial.print(filename);

    Serial.print("    ");

    unsigned long length = f.size();

    Serial.println(length);

    // check if this file is already on the Flash chip

    if (SerialFlash.exists(filename)) {

      Serial.println("  already exists on the Flash chip");

      SerialFlashFile ff = SerialFlash.open(filename);

      if (ff && ff.size() == f.size()) {

        Serial.println("  size is the same, comparing data...");

        if (compareFiles(f, ff) == true) {

          Serial.println("  files are identical :)");

          f.close();

          ff.close();

          continue;  // advance to next file

        } else {

          Serial.println("  files are different");

        }

      } else {

        Serial.print("  size is different, ");

        Serial.print(ff.size());

        Serial.println(" bytes");

      }

      // delete the copy on the Flash chip, if different

      Serial.println("  delete file from Flash chip");

      SerialFlash.remove(filename);

    }

    // create the file on the Flash chip and copy data

    if (SerialFlash.create(filename, length)) {

      SerialFlashFile ff = SerialFlash.open(filename);

      if (ff) {

        Serial.print("  copying");

        // copy data loop

        unsigned long count = 0;

        unsigned char dotcount = 9;

        while (count < length) {

          char buf[256];

          unsigned int n;

          n = f.read(buf, 256);

          ff.write(buf, n);

          count = count + n;

          Serial.print(".");

          if (++dotcount > 100) {

             Serial.println();

             dotcount = 0;

          }

        }

        ff.close();

        if (dotcount > 0) Serial.println();

      } else {

        Serial.println("  error opening freshly created file!");

      }

    } else {

      Serial.println("  unable to create file");

    }

    f.close();

  }

  rootdir.close();

  delay(10);

  Serial.println("Finished All Files");
}

bool compareFiles(File &file, SerialFlashFile &ffile) {

  file.seek(0);

  ffile.seek(0);

  unsigned long count = file.size();

  while (count > 0) {

    char buf1[128], buf2[128];

    unsigned long n = count;

    if (n > 128) n = 128;

    file.read(buf1, n);

    ffile.read(buf2, n);

    if (memcmp(buf1, buf2, n) != 0) return false; // differ

    count = count - n;

  }

  return true;  // all data identical
}

void loop() {
}

void error(const char *message) {

  while (1) {

    Serial.println(message);

    delay(2500);

  }
}