C2D
freq = C2D(p[0]) * 1000;
freq += C2D(p[2]) * 100;
freq += C2D(p[3]) * 10;
freq = C2D(p[0]) * 1000;
freq += C2D(p[1]) * 100;
freq += C2D(p[2]) * 10;
freq += C2D(p[3]);