SerialTransfer.h - transfer ca. 1kB array via UART between boards

Projects Networking, Protocols, and Devices
1

Hi guys,

TLDR: I'm struggling to send larger (1kB) arrays between ESP32 and Teensy4.1, using SerialTransfer.h library.

Situation: I want to send a picture in RGB888, stored in uint8_t picture [width * height * 3] from one board to another. I figured out the code below, which works like a charm, when I send a 5x5px picture.

Problem: When I increase the picture size to e.g. 8x32px (so a little less than 1kB), data does not get fully transferred. My picture array on the receiver side is empty (i.e. 0,0,0) after ca. 84 px already.

Question: Any idea on how to fix this? Is there an alternative way to make use of SerialTransfer.h library to send arrays up to ca. 3kB?

My initial hypothesis was that only 254 packets are transferred --> Need more or bigger packets. However, I failed when trying to modify SerialTansfer library.

Bonus question: Is there any other way to exchange files between the two boards more quickly? Ultimately, I'm aiming to send a 32x32 px picture at ca. 25fps. I failed implementing it with SPI, as apparently neither of the devices supports slave mode?

Code below. Thx for your help!

Sender side:

#include "Arduino.h"
#include "SerialTransfer.h"

SerialTransfer myTransfer;
HardwareSerial Comm(1);

const uint8_t height = 8;
const uint8_t width = 32;
const uint16_t pictureSize = height*width*3+2;
uint8_t picture[pictureSize] = 
  { 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 
    0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 
    0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 
    0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 
    0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 
    0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 
    0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 
    0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00 
  };
  
  int fileName = 0;

void setup(){
  pinMode(33, OUTPUT);          // For LED blinking
  Serial.begin(115200);                     // Define and start serial monitor
  Comm.begin(921600, SERIAL_8N1,15,14);     // Comm_Rxd_pin, Comm_Txd_pin // Define and start Comm serial port
  myTransfer.begin(Comm); 
}

void loop(){
  digitalWrite(33,HIGH); // LED off
 
  myTransfer.sendDatum(fileName);

  uint16_t numPackets = pictureSize / (MAX_PACKET_SIZE - 2); 

  if(pictureSize % MAX_PACKET_SIZE) {
    numPackets++;
  }
  
  for(uint16_t i=0; i<numPackets; i++) 
  {
    uint16_t fileIndex = i * MAX_PACKET_SIZE;
    uint8_t dataLen = MAX_PACKET_SIZE - 2;

    if((fileIndex + (MAX_PACKET_SIZE - 2)) > pictureSize) {
      dataLen = pictureSize - fileIndex;
    }

    uint16_t sendSize = myTransfer.txObj(fileIndex);
    sendSize = myTransfer.txObj(picture[fileIndex], sendSize, dataLen);

    myTransfer.sendData(sendSize, 1);
    //delay(1);
  }
  
  if (myTransfer.status != 0) {
  Serial.print("Error in sending data. Error Code: ");
  Serial.println(myTransfer.status);
  digitalWrite(33, LOW); // LED on
  delay(500);
  digitalWrite(33, HIGH); // LED off
  }
  
  delay(1000);
}

Receiver Code:

#include <SerialTransfer.h>
#include <FastLED.h>

// SerialTransfer setup
SerialTransfer myTransfer;

// Picture buffer and index
const uint8_t width = 32;
const uint8_t height = 8;
const uint16_t pictureSize = height*width*3+2;
uint8_t picture[pictureSize];
int fileName;

// LED setup
#define NUM_LEDS width*height  // Number of LEDs
#define LED_PIN_1 6   // LED data pin
CRGB leds[NUM_LEDS];

// Timer for LED updates
unsigned long lastLedUpdate = 0;
const unsigned long ledUpdateInterval = 1000; // Update LEDs every xxx ms

void setup() {   
    Serial.begin(115200);
    Serial2.setRX(7);
    Serial2.setTX(8);
    Serial2.begin(921600, SERIAL_8N1);
    myTransfer.begin(Serial2);

    FastLED.addLeds<WS2812, LED_PIN_1, GRB>(leds, NUM_LEDS);
    FastLED.setBrightness(30);
}

void loop() {
// Handle UART data  
  if (myTransfer.available()) 
  {
    if(!myTransfer.currentPacketID())
    {
      // Probably that's not needed, but I kept it from the example code 
      myTransfer.rxObj(fileName);
    }
    else if (myTransfer.currentPacketID() == 1) {
      for(uint16_t i=2; i<myTransfer.bytesRead; i++) {
      picture[i] = myTransfer.packet.rxBuff[i];
      Serial.print("Paket Empfangen! ID:");
      Serial.print(i);
      Serial.println();
      }
    }
    Serial.println("Bild Empfangen!");
    printPicture(picture);
  }
    
// Update LED display at a regular interval
    if (millis() - lastLedUpdate >= ledUpdateInterval) {
        //showRainbowPattern();
        pictureToLed();
        lastLedUpdate = millis();
    }
}

void pictureToLed() {
  //Convert picture array to CRGB array
  CRGB pictureCRGB[height*width];
  uint16_t imageIndex = 2;
  for (uint32_t x = 0; x < height * width; x++) {
    pictureCRGB[x] = CRGB(picture[imageIndex], picture[imageIndex+1], picture[imageIndex+2]);
    //Serial.println(imageIndex);
    imageIndex = imageIndex + 3;
  }

  for(int y = 0; y < height; y++) {
    for(int x = 0; x < width; x++) {
      leds[y*width+x] = pictureCRGB[y*width+x];
    }
  }
   FastLED.show();  
}

void printPicture(uint8_t printpicture[height * width * 3]) {
    uint16_t index = 2;
    for (int y = 0; y < height; y++) {
        for (int x = 0; x < width; x++) {
            Serial.print("(");
            Serial.print(printpicture[index]);
            Serial.print(", ");
            Serial.print(printpicture[index+1]);
            Serial.print(", ");
            Serial.print(printpicture[index+2]);
            Serial.print(") ");
            index = index + 3;
        }
        Serial.println(); // New line at the end of each row
    }
}
2

the library has many features like non blocking, packet delimiters, overhead byte stuffing, CRC-8, working with various Serial protocols,...)

do you need all this ?

Would you be OK to have the Arduino blocked whilst the 3KB data is transferred ?
Would you be OK to not know if the data was sent without issues ?

3

All packet based data transfer systems have size limits.

If you want to continue with SerialTransfer.h then you need to fragment your data into chunks then
reassemble the pieces at the receiving end.

4

Thanks for your support!

@J-M-L For both sender and receiver I would not like it to be blocked while transferring. Since the ultimate goal is to send the 3kb approx. 25-30 times per second and I have quite some other time-consuming LED patterns to build / push out via FastLED/OctoWS2811 in parallel.

@mikb55 Thx for the hint, I'll play around with this! I somehow thought, chopping and wrapping around the data was one of the SerialTransfer library features... Might have to do it additionally, though.

5

3 x 1024 x 10 bits x 25 = 768 000 bauds
So at close to 1 million bauds your hardware serial line is almost 80% busy.so can’t afford much extra communication (resend, sync, …)

What kind of LEDs are you dealing with ?

6

I got it to work now, even with 32x32 px. Thanks for the hint to make sure multiple packets are sent.

LED output works (at least in the current stage of the project...). I'll be integrating it into a setup with OctoWS2811 shield on Teensy 4.1, which worked great for similar projects in the past.

Code below:

Sender:

#include "Arduino.h"
#include "SerialTransfer.h"

SerialTransfer myTransfer;
HardwareSerial Comm(1);

const uint8_t height = 32;
const uint8_t width = 32;
const uint16_t pictureSize = height*width*3+2;
uint8_t picture[pictureSize] = 
  { 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 
    0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 
    0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 
    0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 
    0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 
    0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 
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    0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF,
    0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 
    0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00
  };
  
void setup(){
  pinMode(33, OUTPUT);          // For LED blinking
  Serial.begin(115200);                     // Define and start serial monitor
  Comm.begin(1500000, SERIAL_8N1,15,14);     // Comm_Rxd_pin, Comm_Txd_pin // Define and start Comm serial port
  //Set baud rate back to 921600
  myTransfer.begin(Comm); 
}

void loop(){
  
  // Transform picture into smaller chunks each, before sending 
  uint16_t numPackets = pictureSize / (MAX_PACKET_SIZE -2); // Reserve two bytes for current file index

  if(pictureSize % MAX_PACKET_SIZE) // Add another packet, if needed
    numPackets++; 

  for (uint16_t i=0; i < numPackets; i++)
  {
    uint16_t fileIndex = i * MAX_PACKET_SIZE;
    uint8_t dataLen = MAX_PACKET_SIZE - 2;

    if ((fileIndex + (MAX_PACKET_SIZE - 2)) > pictureSize)
      dataLen = pictureSize - fileIndex;

    uint8_t sendSize = myTransfer.txObj(fileIndex);
    sendSize = myTransfer.txObj(picture[fileIndex], sendSize, dataLen);
    
    myTransfer.sendData(sendSize, 1);

    // Debug output
    /* Serial.print("Packet i: ");
    Serial.println(i);
    Serial.print("fileIndex: ");
    Serial.println(fileIndex);
    Serial.print("sendSize: ");
    Serial.println(sendSize);
    Serial.print("dataLen: ");
    Serial.println(dataLen);
    Serial.print("Pixel Value at current fileIndex: (");
    Serial.print(picture[fileIndex]);
    Serial.print(", ");
    Serial.print(picture[fileIndex+1]);
    Serial.print(", ");
    Serial.print(picture[fileIndex+2]);
    Serial.print(")");
    Serial.println(); */
    
    if (myTransfer.status != 0) 
    {
      Serial.print("Error in sending data. Error Code: ");
      Serial.println(myTransfer.status);
      digitalWrite(33, LOW); // LED on
      delay(500);
      digitalWrite(33, HIGH); // LED off
    }
    
    delay(1);
  } 
  delay(1);
}

Receiver:

#include <SerialTransfer.h>
#include <FastLED.h>

// SerialTransfer setup
SerialTransfer myTransfer;

// Picture buffer and index
const uint8_t width = 32;
const uint8_t height = 32;
const uint16_t pictureSize = height*width*3+2;
uint8_t picture[pictureSize];
uint16_t receivedBytes = 0;
uint16_t fileIndex;

// LED setup
#define NUM_LEDS width*height  // Number of LEDs
#define LED_PIN_1 6   // LED data pin
CRGB leds[NUM_LEDS];

// Timer for LED updates
unsigned long lastLedUpdate = 0;
const unsigned long ledUpdateInterval = 40; // Update LEDs every xxx ms

void setup() {   
    Serial.begin(115200);
    Serial2.setRX(7);
    Serial2.setTX(8);
    Serial2.begin(1500000, SERIAL_8N1);
    myTransfer.begin(Serial2);

    FastLED.addLeds<WS2812, LED_PIN_1, GRB>(leds, NUM_LEDS);
    FastLED.setBrightness(10);
}

void loop() {
// Handle UART data  
  if (myTransfer.available()) 
  {    
     for(uint8_t i=0; i<myTransfer.bytesRead; i++) 
      {
        //Serial.print((char)myTransfer.packet.rxBuff[i]);
        myTransfer.rxObj(fileIndex);
        myTransfer.rxObj(picture[fileIndex], 2, myTransfer.bytesRead - 2);
        //Serial.println();
      }

      if(fileIndex > 3000)
      {
        Serial.println("Bild Empfangen!");
        printPicture(picture);
      }      
  }
    
// Update LED display at a regular interval
    if (millis() - lastLedUpdate >= ledUpdateInterval) {
      pictureToLed();
      lastLedUpdate = millis();
    }
}

void pictureToLed() {
  //Convert picture array to CRGB array
  CRGB pictureCRGB[height*width];
  uint16_t imageIndex = 0;
  for (uint32_t x = 0; x < height * width; x++) {
    pictureCRGB[x] = CRGB(picture[imageIndex], picture[imageIndex+1], picture[imageIndex+2]);
    //Serial.println(imageIndex);
    imageIndex = imageIndex + 3;
  }

  map_to_leds(pictureCRGB, leds, height, width);
  FastLED.show();  
}

void printPicture(uint8_t printpicture[height * width * 3]) {
    uint16_t index = 0;
    for (int y = 0; y < height; y++) {
        for (int x = 0; x < width; x++) {
            Serial.print("(");
            Serial.print(printpicture[index]);
            Serial.print(", ");
            Serial.print(printpicture[index+1]);
            Serial.print(", ");
            Serial.print(printpicture[index+2]);
            Serial.print(") ");
            index = index + 3;
        }
        Serial.println(); // New line at the end of each row
    }
}

void map_to_leds(CRGB *pictureCRGB, CRGB *leds, int height, int width) {
    int partHeight = 8; // Height of each part

    for (int i = 0; i < height * width; i++) {
        int row = i / width;
        int column = i % width;

        // Determine which part the pixel is in
        int part = row / partHeight;

        // Adjust row within the part
        int row_within_part = row % partHeight;

        // Zig-zag pattern mapping for each part
        int mapped_index;
        if (column % 2 == 0) {
            // Even columns go downwards
            mapped_index = part * (partHeight * width) + column * partHeight + row_within_part;
        } else {
            // Odd columns go upwards
            mapped_index = part * (partHeight * width) + column * partHeight + (partHeight - 1 - row_within_part);
        }

        // Assign the value from pictureCRGB to leds
        leds[mapped_index] = pictureCRGB[i];
    }
}
7

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