a9tmr_gettime
uint64_t now = a9tmr_gettime(sc);
a9tmr_gettime(sc));
while ((now = a9tmr_gettime(sc)) < when) {
a9tmr_gettime(sc));
const uint64_t base = a9tmr_gettime(sc);
while (a9tmr_gettime(sc) < finish) {
const uint64_t now = a9tmr_gettime(sc);
return (u_int) (a9tmr_gettime(sc));