stm32_dma_get_burst
src_burst_size = stm32_dma_get_burst(chan, src_best_burst);
dst_burst_size = stm32_dma_get_burst(chan, dst_best_burst);
dma_burst = stm32_dma_get_burst(chan, best_burst);
dst_burst_size = stm32_dma_get_burst(chan, dst_best_burst);
src_burst_size = stm32_dma_get_burst(chan, src_best_burst);