How do I transfer RAW file using the bluetooth?

Other Hardware Storage
1

Hi , I'm korean student.
I'm working on my project that tft-LCD display saved-image from SDcard. But, In order to transfer data using the bluetooth
between arduino, I must use "Serial read/write". Is it so? But, "serial read/write" allowed only 1byte and RAW file is 2byte/1pixel.

So, I want to know how to transfer RAW data using the bluetooth and how to save RAW data to SDcard.
Please give me advise.??

void setup()
{

  Serial.begin(9600);
  Serial1.begin(9600); //hardware Serial use. //pin18,19
  // Setup the LCD
  myGLCD.InitLCD();
  myGLCD.setFont(SmallFont);
  myGLCD.fillScr(0, 0, 255);

  

  if(!sd_raw_init())
  {
    Serial.println("MMC/SD initialization failed");      
  }
  pinMode(SD_PIN, OUTPUT);
  if (!SD.begin(SD_PIN)) {
    ShowMessage("SD not ready");
    return;
  }

  delay(10);
  //root = SD.open("/PICTURE");
  //WalkDirectory(root);

  //    ShowMessage("That's the end of the show", "Press RESET to start over");
}

void loop()
{
  datafile= SD.open("log2.txt",FILE_WRITE);

  int i=1;
  if(Serial1.available())
  {
    while(Serial1.available()>0) 
    {
      
           inbyte_char= Serial1.read();
           
            Serial.print(inbyte_char);
            if( (i%50)==0) { //cutting 50 row.

              Serial.println("");
            }
            i++;
           datafile.write(inbyte_char); 
            delay(1);
      }
      
      Serial.println("Read success!");
    }
   datafile.close();
     //Serial.println("Read success!");
  }
2

between arduino, I must use "Serial read/write". Is it so?

Yes.

But, "serial read/write" allowed only 1byte and RAW file is 2byte/1pixel.

The file contains bytes. It is up to the application that reads the files to know how many bytes to read in any given situation.

3

Thank you answer.
Then, all data types of RAW file are 'byte'?
For example,
when
char inbyte_char;
inbyte_char = Serial1.read();

Do I need to change the data type 'char' of 'inbyte_char' to the data type 'byte'?
Please help me one more time.

4

Then, all data types of RAW file are 'byte'?

All files are just bytes.

char inbyte_char;

No. The name needs to be inbyte_char_float_int_double_long_bool.

Do I need to change the data type 'char' of 'inbyte_char' to the data type 'byte'?

Yes.