TC_READ
ctrl = TC_READ(tc1, TC_CTRL);
ctrl = TC_READ(tc2, TC_CTRL);
return TC_READ(tc2, TC_VAL) ^ TC_MASK; /* It is decremental counter */
prev = TC_READ(tc2, TC_VAL) & TC_MASK;
now = TC_READ(tc2, TC_VAL) & TC_MASK;