Playing with Arduino Uno R4 Matrix: simple animation

ArduinoMatrixSample.ino

#include "Arduino_LED_Matrix.h"
ArduinoLEDMatrix matrix;
void setup() {
  matrix.begin();
}

uint8_t frame[8][12] = {
  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }
};

uint8_t row = 0;
uint8_t col = 0;

void loop() {
  
  frame[row][col] = 1;
  matrix.renderBitmap(frame, 8, 12);
  delay(150);
  frame[row][col] = 0;
  matrix.renderBitmap(frame, 8, 12);
  delay(50);
  row++;  
  if (frame[row][col] == 1) {
    frame[row-1][col] = 1;
    if (row - 1 == 0) {
      col++;
    }    
    row = 0;    
  }
  if (row >= 8) {
    frame[row-1][col] = 1;
    row = 0;
  }
}