STV0297_CLOCK_KHZ
tmp *= STV0297_CLOCK_KHZ;
tmp = tmp / (STV0297_CLOCK_KHZ / 4); /* 1/4 = 2^-2 */
freq -= STV0297_CLOCK_KHZ;
tmp = (STV0297_CLOCK_KHZ * 1000) / (1 << 16);