Hat_V2_Hardware_Test_DotStar works fine

#include <Adafruit_DotStar.h>

#define NUMPIXELS 28  // Number of LEDs in strip

#define DATAPIN    6
#define CLOCKPIN   5
Adafruit_DotStar strip = Adafruit_DotStar(NUMPIXELS, DATAPIN, CLOCKPIN, DOTSTAR_BGR);

void setup() {
  strip.begin();
  strip.show();
}

void loop() {
  strip.setPixelColor(0, 32, 0, 0);
  strip.setPixelColor(1, 0, 32, 0);
  strip.setPixelColor(2, 0, 0, 32);
  strip.setPixelColor(27, 32, 0, 32);
  strip.show();
  delay(8);
}