ESP_DMA_OVERRUN
ESP_DMA_OVERRUN;
ESP_DMA_OVERRUN;
esc->sc_tail_size += ESP_DMA_OVERRUN;
esc->sc_main_size += ESP_DMA_OVERRUN;
esc->sc_tail_size += ESP_DMA_OVERRUN;
esc->sc_main_dmamap->dm_mapsize -= ESP_DMA_OVERRUN;
ESP_DMA_OVERRUN;
#define ESP_DMA_TAILBUFSIZE (ESP_DMA_MAXTAIL+2*DMA_ENDALIGNMENT+ESP_DMA_OVERRUN)