sif_read_mask
ack = sif_read_mask(ddc, DDC_DDCMCTL1, DDCM_ACK_MASK, DDCM_ACK_OFFSET);
ack = sif_read_mask(ddc, DDC_DDCMCTL1, DDCM_ACK_MASK,
msg->buf[index + i - 1] = sif_read_mask(ddc, offset,
ack = sif_read_mask(ddc, DDC_DDCMCTL1, DDCM_ACK_MASK, DDCM_ACK_OFFSET);