IPR_EFXBUFHALFFULL
epcm->capture_ipr = IPR_EFXBUFFULL|IPR_EFXBUFHALFFULL;
if (status & IPR_EFXBUFHALFFULL) {
status &= ~(IPR_EFXBUFFULL|IPR_EFXBUFHALFFULL);
if (status & (IPR_EFXBUFFULL|IPR_EFXBUFHALFFULL)) {