RME9652_thru_base
rme9652_write(rme9652, RME9652_thru_base + k * 4, 0);
rme9652_write(rme9652, RME9652_thru_base + i * 4, 1);
rme9652_write(rme9652, RME9652_thru_base + i * 4, 0);
RME9652_thru_base + mapped_channel * 4,