//Write a code to store a data in SPI flash and retrive the data print in UART (Ardino UNO)

#include <SPI.h>
#include <Wire.h>
#include <SD.h>
File dataFile;
char fileName[] = "data.txt";
char Read;
void setup() 
{
  Serial.begin(9600);
  if (!SD.begin(10)) 
  {
    return;
  }
  Serial.println("SD initialization done.");
  dataFile = SD.open("data.txt", FILE_WRITE);
  if (dataFile) 
  {
    //dataFile.println("Hello, Arduino Uno!");
    dataFile.close();
  }
}
void loop() 
{
  char ReceivedArray[10]="";
  Serial.println("Enter 5 bytes string");
  for(int i = 0; i < 6; i++) 
  {
    while ((Serial.available())==0);
    Read = tolower(Serial.read());  
    Serial.write(Read); 
    if (Read != '\n')
    {
      ReceivedArray[i] = Read;
    }
  }
  // Read and print data from the SD card
  dataFile = SD.open(fileName,FILE_WRITE);
  if (dataFile) 
  {
  //  Serial.println("Reading data from SD card:");
    Serial.println("Writing data.txt");
    dataFile.println(ReceivedArray);
    dataFile.close(); 
    Serial.println("Done");
    }
  else 
  {
    Serial.println("Error");
  } 
   delay(100);
   readFile();
   delay(100);

if(SD.exists(fileName))
{
  SD.remove(fileName);
}
}
void readFile()
{
  char a[100];
  byte b=0;
  if(!SD.exists(fileName))
  {
    Serial.println("Not exist");
  }
  Serial.println("Reading data.txt");
  dataFile = SD.open(fileName);
  while(dataFile.available())
  {
    char input = dataFile.read();
    if(input =='\n')
    {
      a[b]=0;
      Serial.println(a);
      b=0;
    }
    else
    { 
      a[b]=input;
      b++;
      if(b>sizeof(input))
      {
      delay(100);
      }
    }
}
}