LPF
if (Rest < LPF)
else if (Rest < 2 * LPF)
Rest = 2 * LPF;
else if (Rest > (FREF - LPF)) {
} else if (Rest > (FREF - 2 * LPF))
Rest = FREF - 2 * LPF;
if (Rest < LPF)
else if (Rest < 2 * LPF)
Rest = 2 * LPF;
else if (Rest > (FREF - LPF)) {
} else if (Rest > (FREF - 2 * LPF))
Rest = FREF - 2 * LPF;