+#define I2S_CACHED_CHUNK_SIZE 2
+
+#define I2S_TX_DMAC_CFG (BV(DMAC_CFG_DST_H2SEL) | \
+ BV(DMAC_CFG_SOD) | \
+ ((3 << DMAC_CFG_DST_PER_SHIFT) & DMAC_CFG_DST_PER_MASK) | \
+ (4 & DMAC_CFG_SRC_PER_MASK))
+
+#define I2S_TX_DMAC_CTRLA (DMAC_CTRLA_SRC_WIDTH_HALF_WORD | \
+ DMAC_CTRLA_DST_WIDTH_HALF_WORD)
+
+#define I2S_TX_DMAC_CTRLB (DMAC_CTRLB_FC_MEM2PER_DMA_FC | \
+ DMAC_CTRLB_DST_INCR_FIXED | \
+ DMAC_CTRLB_SRC_INCR_INCREMENTING)
+
+#define I2S_RX_DMAC_CFG (BV(DMAC_CFG_SRC_H2SEL) | \
+ BV(DMAC_CFG_SOD) | \
+ ((3 << DMAC_CFG_DST_PER_SHIFT) & DMAC_CFG_DST_PER_MASK) | \
+ (4 & DMAC_CFG_SRC_PER_MASK))
+
+#define I2S_RX_DMAC_CTRLA (DMAC_CTRLA_SRC_WIDTH_HALF_WORD | \
+ DMAC_CTRLA_DST_WIDTH_HALF_WORD)
+
+#define I2S_RX_DMAC_CTRLB (DMAC_CTRLB_FC_PER2MEM_DMA_FC | \
+ DMAC_CTRLB_DST_INCR_INCREMENTING | \
+ DMAC_CTRLB_SRC_INCR_FIXED)
+
+