Text in Programm Memory speichern; z.T. Probleme mit Zeilenumbrüchen

#include <avr/pgmspace.h>

char const PROGMEM largeText[] = "dasdf";

void setup()
{
  Serial.begin(9600);
  Serial.println("Start...");

  int idx = 0;
  while((char)pgm_read_byte_near(&largeText[idx]) != '\0')
  {
    Serial.print((char)pgm_read_byte_near(&largeText[idx]));
    idx++;
  }
}

void loop()
{
}