AT_XDMAC_CIS
while (!(at_xdmac_chan_read(atchan, AT_XDMAC_CIS) & AT_XDMAC_CIS_FIS))
while (!(at_xdmac_chan_read(atchan, AT_XDMAC_CIS) & AT_XDMAC_CIS_FIS))
chan_status = at_xdmac_chan_read(atchan, AT_XDMAC_CIS);
while (at_xdmac_chan_read(atchan, AT_XDMAC_CIS))
while (at_xdmac_chan_read(atchan, AT_XDMAC_CIS))