PDMACHCR
rsnd_dmapp_bset(dma, 0, PDMACHCR_DE, PDMACHCR);
if (0 == (rsnd_dmapp_read(dma, PDMACHCR) & PDMACHCR_DE))
rsnd_dmapp_write(dma, dmapp->chcr, PDMACHCR);