NBPF_CHAN_CFG_DDS
hwdesc->config = NBPF_CHAN_CFG_SAD | (NBPF_CHAN_CFG_DDS & (mem_xfer << 16)) |
(NBPF_CHAN_CFG_DDS & (slave_xfer << 16)) | NBPF_CHAN_CFG_REQD;
(NBPF_CHAN_CFG_DDS & (mem_xfer << 16));