TC_WRITE
TC_WRITE(tc1, TC_CTRL, ctrl);
TC_WRITE(tc1, TC_LOAD, 512 * 1000 / hz - 1); /* 512kHz / hz - 1 */
TC_WRITE(tc2, TC_CTRL, ctrl);
TC_WRITE(tc2, TC_LOAD, TC_MAX);
TC_WRITE(tc1, TC_EOI, EOI_EOI);