add some more audio defs

teensy4/imxrt.h

 #define I2S3_RFR3			(IMXRT_I2S3.offset0CC)
 #define I2S3_RMR			(IMXRT_I2S3.offset0E0)
 
+#define I2S_RCR1_RFW(n)			((uint32_t)n & 0x1f)	// Receive FIFO watermark
+#define I2S_RCR2_DIV(n)			((uint32_t)n & 0xff)	// Bit clock divide by (DIV+1)*2
+#define I2S_RCR2_BCD			((uint32_t)1<<24)	// Bit clock direction
+#define I2S_RCR2_MSEL(n)		((uint32_t)(n & 3)<<26)	// MCLK select, 0=bus clock, 1=I2S0_MCLK
+#define I2S_RCR2_SYNC(n)		((uint32_t)(n & 3)<<30)	// 0=async 1=sync with trasmitter
+#define I2S_RCR3_RCE			((uint32_t)0x10000)	// receive channel enable
+#define I2S_RCR4_FSD			((uint32_t)1)		// Frame Sync Direction
+#define I2S_RCR4_FSE			((uint32_t)8)		// Frame Sync Early
+#define I2S_RCR4_MF			((uint32_t)0x10)	// MSB First
+#define I2S_RCR4_SYWD(n)		((uint32_t)(n & 0x1f)<<8)	// Sync Width
+#define I2S_RCR4_FRSZ(n)		((uint32_t)(n & 0x0f)<<16)	// Frame Size
+#define I2S_RCR5_FBT(n)			((uint32_t)(n & 0x1f)<<8)	// First Bit Shifted
+#define I2S_RCR5_W0W(n)			((uint32_t)(n & 0x1f)<<16)	// Word 0 Width
+#define I2S_RCR5_WNW(n)			((uint32_t)(n & 0x1f)<<24)	// Word N Width
+#define I2S_RCSR_RE			((uint32_t)0x80000000)	// Receiver Enable
+#define I2S_RCSR_FR			((uint32_t)0x02000000)	// FIFO Reset
+#define I2S_RCSR_FRDE			((uint32_t)0x00000001)	// FIFO Request DMA Enable
+#define I2S_RCSR_BCE			((uint32_t)0x10000000)	// Bit Clock Enable
+#define I2S_TCR1_RFW(n)			((uint32_t)n & 0x1f)	// Receive FIFO watermark
+#define I2S_TCR2_DIV(n)			((uint32_t)n & 0xff)	// Bit clock divide by (DIV+1)*2
+#define I2S_TCR2_BCD			((uint32_t)1<<24)	// Bit clock direction
+#define I2S_TCR2_MSEL(n)		((uint32_t)(n & 3)<<26)	// MCLK select, 0=bus clock, 1=I2S0_MCLK
+#define I2S_TCR2_SYNC(n)		((uint32_t)(n & 3)<<30)	// 0=async 1=sync with receiver
+#define I2S_TCR3_TCE			((uint32_t)0x10000)	// receive channel enable
+#define I2S_TCR4_FSD			((uint32_t)1)		// Frame Sync Direction
+#define I2S_TCR4_FSE			((uint32_t)8)		// Frame Sync Early
+#define I2S_TCR4_MF			((uint32_t)0x10)	// MSB First
+#define I2S_TCR4_SYWD(n)		((uint32_t)(n & 0x1f)<<8)	// Sync Width
+#define I2S_TCR4_FRSZ(n)		((uint32_t)(n & 0x0f)<<16)	// Frame Size
+#define I2S_TCR5_FBT(n)			((uint32_t)(n & 0x1f)<<8) 	// First Bit Shifted
+#define I2S_TCR5_W0W(n)			((uint32_t)(n & 0x1f)<<16)	// Word 0 Width
+#define I2S_TCR5_WNW(n)			((uint32_t)(n & 0x1f)<<24)	// Word N Width
+#define I2S_TCSR_TE			((uint32_t)0x80000000)		// Receiver Enable
+#define I2S_TCSR_BCE			((uint32_t)0x10000000)	// Bit Clock Enable
+#define I2S_TCSR_FR			((uint32_t)0x02000000)	// FIFO Reset
+#define I2S_TCSR_FRDE			((uint32_t)0x00000001)	// FIFO Request DMA Enable
+
 // 49.3.1.1: page 2784
 #define IMXRT_SEMC		(*(IMXRT_REGISTER32_t *)0x402F0000)
 #define SEMC_MCR			(IMXRT_SEMC.offset000)