alt_sgdma_construct_descriptor_burst(
(volatile struct alt_sgdma_descriptor *)&tx_desc[0],
(volatile struct alt_sgdma_descriptor *)&tx_desc[1],
alt_sgdma_construct_descriptor_burst(
(volatile struct alt_sgdma_descriptor *)&tx_desc[0],
(volatile struct alt_sgdma_descriptor *)&tx_desc[1],