#include <Adafruit_GFX.h>
#include <Adafruit_NeoMatrix.h>
#include <Adafruit_NeoPixel.h>
#ifndef PSTR
  #define PSTR
#endif
#define PIN 6

Adafruit_NeoMatrix matrix = Adafruit_NeoMatrix(32,8,PIN,
NEO_MATRIX_TOP + NEO_MATRIX_LEFT +
NEO_MATRIX_COLUMNS + NEO_MATRIX_ZIGZAG,
NEO_GRB+NEO_KHZ800);

const uint16_t colors[] = {
  matrix.Color(255,0,0), matrix.Color(0,255,0), matrix.Color(0,0,255) };

  void setup(){
    matrix.begin();
    matrix.setTextWrap();
    matrix.setBrightness();
    matrix.setTextColor(colors[0]);
  }
  int x = matrix.width();
  int pass = 0;

void loop(){
  matrix.fillScreen(0);
  matrix.setCursor(x, 0);
  matrix.print(F("xin chao cac ban"));
  if(--x < -80){
    x = matrix.width();
  }
}

if(++pass >= 3) pass = 0;
matrix.setTextColor(colors[pass]);