text: /**********************************************************************
  * $Id$		lpc17xx_i2s.c				2010-09-23
  *//**
  * @file		lpc17xx_i2s.c
  * @brief	Contains all functions support for I2S firmware
  * 			library on LPC17xx
  * @version	3.1
  * @date		23. Sep. 2010
  * @author	NXP MCU SW Application Team
  *
  * Copyright(C) 2010, NXP Semiconductor
  * All rights reserved.
  *
  ***********************************************************************
  * Software that is described herein is for illustrative purposes only
  * which provides customers with programming information regarding the
  * products. This software is supplied "AS IS" without any warranties.
  * NXP Semiconductors assumes no responsibility or liability for the
  * use of the software, conveys no license or title under any patent,
  * copyright, or mask work right to the product. NXP Semiconductors
  * reserves the right to make changes in the software without
  * notification. NXP Semiconductors also make no representation or
  * warranty that such application will be suitable for the specified
  * use without further testing or modification.
  * Permission to use, copy, modify, and distribute this software and its
  * documentation is hereby granted, under NXP Semiconductors'
  * relevant copyright in the software, without fee, provided that it
  * is used in conjunction with NXP Semiconductors microcontrollers.  This
  * copyright, permission, and disclaimer notice must appear in all copies of
  * this code.
  **********************************************************************/
  
  /* Peripheral group ----------------------------------------------------------- */
  /** @addtogroup I2S
   * @{
   */
  
  /* Includes ------------------------------------------------------------------- */
  #include "lpc17xx_i2s.h"
  #include "lpc17xx_clkpwr.h"
  
  
  /* If this source file built with example, the LPC17xx FW library configuration
   * file in each example directory ("lpc17xx_libcfg.h") must be included,
   * otherwise the default FW library configuration file must be included instead
   */
  #ifdef __BUILD_WITH_EXAMPLE__
  #include "lpc17xx_libcfg.h"
  #else
  #include "lpc17xx_libcfg_default.h"
  #endif /* __BUILD_WITH_EXAMPLE__ */
  
  
  #ifdef _I2S
  
  /* Private Functions ---------------------------------------------------------- */
  
  static uint8_t i2s_GetWordWidth(LPC_I2S_TypeDef *I2Sx, uint8_t TRMode);
  static uint8_t i2s_GetChannel(LPC_I2S_TypeDef *I2Sx, uint8_t TRMode);
  
  /********************************************************************//**
   * @brief		Get I2S wordwidth value
   * @param[in]	I2Sx I2S peripheral selected, should be: LPC_I2S
   * @param[in]	TRMode is the I2S mode, should be:
   * 				- I2S_TX_MODE = 0: transmit mode
   * 				- I2S_RX_MODE = 1: receive mode
   * @return 		The wordwidth value, should be: 8,16 or 32
   *********************************************************************/
  static uint8_t i2s_GetWordWidth(LPC_I2S_TypeDef *I2Sx, uint8_t TRMode) {
  	uint8_t value;
  
  	CHECK_PARAM(PARAM_I2Sx(I2Sx));
  	CHECK_PARAM(PARAM_I2S_TRX(TRMode));
  
  	if (TRMode == I2S_TX_MODE) {
  		value = (I2Sx->I2SDAO) & 0x03; /* get wordwidth bit */
  	} else {
  		value = (I2Sx->I2SDAI) & 0x03; /* get wordwidth bit */
  	}
  	switch (value) {
  	case I2S_WORDWIDTH_8:
  		return 8;
  	case I2S_WORDWIDTH_16:
  		return 16;
  	default:
  		return 32;
  	}
  }
  
  /********************************************************************//**
   * @brief		Get I2S channel value
   * @param[in]	I2Sx I2S peripheral selected, should be: LPC_I2S
   * @param[in]	TRMode is the I2S mode, should be:
   * 				- I2S_TX_MODE = 0: transmit mode
   * 				- I2S_RX_MODE = 1: receive mode
   * @return 		The channel value, should be: 1(mono) or 2(stereo)
   *********************************************************************/
  static uint8_t i2s_GetChannel(LPC_I2S_TypeDef *I2Sx, uint8_t TRMode) {
  	uint8_t value;
  
  	CHECK_PARAM(PARAM_I2Sx(I2Sx));
  	CHECK_PARAM(PARAM_I2S_TRX(TRMode));
  
  	if (TRMode == I2S_TX_MODE) {
  		value = ((I2Sx->I2SDAO) & 0x04)>>2; /* get bit[2] */
  	} else {
  		value = ((I2Sx->I2SDAI) & 0x04)>>2; /* get bit[2] */
  	}
          if(value == I2S_MONO) return 1;
            return 2;
  }
  
  /* End of Private Functions --------------------------------------------------- */
  
  
  /* Public Functions ----------------------------------------------------------- */
  /** @addtogroup I2S_Public_Functions
   * @{
   */
  
  /********************************************************************//**
   * @brief		Initialize I2S
   * 					- Turn on power and clock
   * @param[in]	I2Sx I2S peripheral selected, should be: LPC_I2S
   * @return 		none
   *********************************************************************/
  void I2S_Init(LPC_I2S_TypeDef *I2Sx) {
  	CHECK_PARAM(PARAM_I2Sx(I2Sx));
  
  	// Turn on power and clock
  	CLKPWR_ConfigPPWR(CLKPWR_PCONP_PCI2S, ENABLE);
  	LPC_I2S->I2SDAI = LPC_I2S->I2SDAO = 0x00;
  }
  
  /********************************************************************//**
   * @brief		Configuration I2S, setting:
   * 					- master/slave mode
   * 					- wordwidth value
   * 					- channel mode
   * @param[in]	I2Sx I2S peripheral selected, should be: LPC_I2S
   * @param[in]	TRMode transmit/receive mode, should be:
   * 					- I2S_TX_MODE = 0: transmit mode
   * 					- I2S_RX_MODE = 1: receive mode
   * @param[in]	ConfigStruct pointer to I2S_CFG_Type structure
   *              which will be initialized.
   * @return 		none
   *********************************************************************/
  void I2S_Config(LPC_I2S_TypeDef *I2Sx, uint8_t TRMode, I2S_CFG_Type* ConfigStruct)
  {
  	uint32_t bps, config;
  
  	CHECK_PARAM(PARAM_I2Sx(I2Sx));
  
  	CHECK_PARAM(PARAM_I2S_WORDWIDTH(ConfigStruct->wordwidth));
  	CHECK_PARAM(PARAM_I2S_CHANNEL(ConfigStruct->mono));
  	CHECK_PARAM(PARAM_I2S_STOP(ConfigStruct->stop));
  	CHECK_PARAM(PARAM_I2S_RESET(ConfigStruct->reset));
  	CHECK_PARAM(PARAM_I2S_WS_SEL(ConfigStruct->ws_sel));
  	CHECK_PARAM(PARAM_I2S_MUTE(ConfigStruct->mute));
  
  	/* Setup clock */
  	bps = (ConfigStruct->wordwidth +1)*8;
  
  	/* Calculate audio config */
  	config = (bps - 1)<<6 | (ConfigStruct->ws_sel)<<5 | (ConfigStruct->reset)<<4 |
  		(ConfigStruct->stop)<<3 | (ConfigStruct->mono)<<2 | (ConfigStruct->wordwidth);
  
  	if(TRMode == I2S_RX_MODE){
  		LPC_I2S->I2SDAI = config;
  	}else{
  		LPC_I2S->I2SDAO = config;
  	}
  }
  
  /********************************************************************//**
   * @brief		DeInitial both I2S transmit or receive
   * @param[in]	I2Sx I2S peripheral selected, should be: LPC_I2S
   * @return 		none
   *********************************************************************/
  void I2S_DeInit(LPC_I2S_TypeDef *I2Sx) {
  	CHECK_PARAM(PARAM_I2Sx(I2Sx));
  
  	// Turn off power and clock
  	CLKPWR_ConfigPPWR(CLKPWR_PCONP_PCI2S, DISABLE);
  }
  
  /********************************************************************//**
   * @brief		Get I2S Buffer Level
   * @param[in]	I2Sx I2S peripheral selected, should be: LPC_I2S
   * @param[in]	TRMode Transmit/receive mode, should be:
   * 					- I2S_TX_MODE = 0: transmit mode
   * 					- I2S_RX_MODE = 1: receive mode
   * @return 		current level of Transmit/Receive Buffer
   *********************************************************************/
  uint8_t I2S_GetLevel(LPC_I2S_TypeDef *I2Sx, uint8_t TRMode)
  {
  	CHECK_PARAM(PARAM_I2Sx(I2Sx));
  	CHECK_PARAM(PARAM_I2S_TRX(TRMode));
  
  	if(TRMode == I2S_TX_MODE)
  	{
  		return ((I2Sx->I2SSTATE >> 16) & 0xFF);
  	}
  	else
  	{
  		return ((I2Sx->I2SSTATE >> 8) & 0xFF);
  	}
  }
  
  /********************************************************************//**
   * @brief		I2S Start: clear all STOP,RESET and MUTE bit, ready to operate
   * @param[in]	I2Sx I2S peripheral selected, should be: LPC_I2S
   * @return 		none
   *********************************************************************/
  void I2S_Start(LPC_I2S_TypeDef *I2Sx)
  {
  	//Clear STOP,RESET and MUTE bit
  	I2Sx->I2SDAO &= ~I2S_DAI_RESET;
  	I2Sx->I2SDAI &= ~I2S_DAI_RESET;
  	I2Sx->I2SDAO &= ~I2S_DAI_STOP;
  	I2Sx->I2SDAI &= ~I2S_DAI_STOP;
  	I2Sx->I2SDAO &= ~I2S_DAI_MUTE;
  }
  
  /********************************************************************//**
   * @brief		I2S Send data
   * @param[in]	I2Sx I2S peripheral selected, should be: LPC_I2S
   * @param[in]	BufferData pointer to uint32_t is the data will be send
   * @return 		none
   *********************************************************************/
  void I2S_Send(LPC_I2S_TypeDef *I2Sx, uint32_t BufferData) {
  	CHECK_PARAM(PARAM_I2Sx(I2Sx));
  
  	I2Sx->I2STXFIFO = BufferData;
  }
  
  /********************************************************************//**
   * @brief		I2S Receive Data
   * @param[in]	I2Sx pointer to LPC_I2S_TypeDef
   * @return 		received value
   *********************************************************************/
  uint32_t I2S_Receive(LPC_I2S_TypeDef* I2Sx) {
  	CHECK_PARAM(PARAM_I2Sx(I2Sx));
  
  	return (I2Sx->I2SRXFIFO);
  
  }
  
  /********************************************************************//**
   * @brief		I2S Pause
   * @param[in]	I2Sx I2S peripheral selected, should be: LPC_I2S
   * @param[in]	TRMode is transmit/receive mode, should be:
   * 				- I2S_TX_MODE = 0: transmit mode
   * 				- I2S_RX_MODE = 1: receive mode
   * @return 		none
   *********************************************************************/
  void I2S_Pause(LPC_I2S_TypeDef *I2Sx, uint8_t TRMode) {
  	CHECK_PARAM(PARAM_I2Sx(I2Sx));
  	CHECK_PARAM(PARAM_I2S_TRX(TRMode));
  
  	if (TRMode == I2S_TX_MODE) //Transmit mode
  	{
  		I2Sx->I2SDAO |= I2S_DAO_STOP;
  	} else //Receive mode
  	{
  		I2Sx->I2SDAI |= I2S_DAI_STOP;
  	}
  }
  
  /********************************************************************//**
   * @brief		I2S Mute
   * @param[in]	I2Sx I2S peripheral selected, should be: LPC_I2S
   * @param[in]	TRMode is transmit/receive mode, should be:
   * 				- I2S_TX_MODE = 0: transmit mode
   * 				- I2S_RX_MODE = 1: receive mode
   * @return 		none
   *********************************************************************/
  void I2S_Mute(LPC_I2S_TypeDef *I2Sx, uint8_t TRMode) {
  	CHECK_PARAM(PARAM_I2Sx(I2Sx));
  	CHECK_PARAM(PARAM_I2S_TRX(TRMode));
  
  	if (TRMode == I2S_TX_MODE) //Transmit mode
  	{
  		I2Sx->I2SDAO |= I2S_DAO_MUTE;
  	} else //Receive mode
  	{
  		I2Sx->I2SDAI |= I2S_DAI_MUTE;
  	}
  }
  
  /********************************************************************//**
   * @brief		I2S Stop
   * @param[in]	I2Sx I2S peripheral selected, should be: LPC_I2S
   * @param[in]	TRMode is transmit/receive mode, should be:
   * 				- I2S_TX_MODE = 0: transmit mode
   * 				- I2S_RX_MODE = 1: receive mode
   * @return 		none
   *********************************************************************/
  void I2S_Stop(LPC_I2S_TypeDef *I2Sx, uint8_t TRMode) {
  	CHECK_PARAM(PARAM_I2Sx(I2Sx));
  	CHECK_PARAM(PARAM_I2S_TRX(TRMode));
  
  	if (TRMode == I2S_TX_MODE) //Transmit mode
  	{
  		I2Sx->I2SDAO &= ~I2S_DAO_MUTE;
  		I2Sx->I2SDAO |= I2S_DAO_STOP;
  		I2Sx->I2SDAO |= I2S_DAO_RESET;
  	} else //Receive mode
  	{
  		I2Sx->I2SDAI |= I2S_DAI_STOP;
  		I2Sx->I2SDAI |= I2S_DAI_RESET;
  	}
  }
  
  /********************************************************************//**
   * @brief		Set frequency for I2S
   * @param[in]	I2Sx I2S peripheral selected, should be: LPC_I2S
   * @param[in]	Freq is the frequency for I2S will be set. It can range
   * 				from 16-96 kHz(16, 22.05, 32, 44.1, 48, 96kHz)
   * @param[in]	TRMode is transmit/receive mode, should be:
   * 				- I2S_TX_MODE = 0: transmit mode
   * 				- I2S_RX_MODE = 1: receive mode
   * @return 		Status: ERROR or SUCCESS
   *********************************************************************/
  Status I2S_FreqConfig(LPC_I2S_TypeDef *I2Sx, uint32_t Freq, uint8_t TRMode) {
  
  	uint32_t i2s_clk;
  	uint8_t channel, wordwidth;
  	uint32_t x, y;
  	uint64_t divider;
  	uint16_t dif;
  	uint16_t x_divide, y_divide;
  	uint16_t err, ErrorOptimal = 0xFFFF;
  	
  	uint32_t N;
  
  	CHECK_PARAM(PARAM_I2Sx(I2Sx));
  	CHECK_PARAM(PRAM_I2S_FREQ(Freq));
  	CHECK_PARAM(PARAM_I2S_TRX(TRMode));
  
  	//Get the frequency of PCLK_I2S
  	i2s_clk = CLKPWR_GetPCLK(CLKPWR_PCLKSEL_I2S);
  
  	if(TRMode == I2S_TX_MODE)
  	{
  		channel = i2s_GetChannel(I2Sx,I2S_TX_MODE);
  		wordwidth = i2s_GetWordWidth(I2Sx,I2S_TX_MODE);
  	}
  	else
  	{
  		channel = i2s_GetChannel(I2Sx,I2S_RX_MODE);
  		wordwidth = i2s_GetWordWidth(I2Sx,I2S_RX_MODE);
  	}
  
  	/* Calculate X and Y divider
  	 * The MCLK rate for the I2S transmitter is determined by the value
  	 * in the I2STXRATE/I2SRXRATE register. The required I2STXRATE/I2SRXRATE
  	 * setting depends on the desired audio sample rate desired, the format
  	 * (stereo/mono) used, and the data size.
  	 * The formula is:
  	 * 		I2S_MCLK = PCLK_I2S * (X/Y) / 2
       * In that, Y must be greater than or equal to X. X should divides evenly
       * into Y. 
  	 * We have:
  	 * 		I2S_MCLK = Freq * channel*wordwidth * (I2STXBITRATE+1);
  	 * So: (X/Y) = (Freq * channel*wordwidth * (I2STXBITRATE+1))*2/PCLK_I2S
  	 * We use a loop function to chose the most suitable X,Y value
  	 */
  
  	/* divider is a fixed point number with 16 fractional bits */
      divider = (((uint64_t)Freq *channel*wordwidth * 2)<<16) / i2s_clk;
  
  	/* find N that make x/y <= 1 -> divider <= 2^16 */
  	for(N=64;N>0;N--){
  		if((divider*N) < (1<<16)) break;
  	}
  
  	if(N == 0) return ERROR;
  
  	divider *= N;
  
  	for (y = 255; y > 0; y--) {
  		x = y * divider;
  		if(x & (0xFF000000)) continue;
  		dif = x & 0xFFFF;
  		if(dif>0x8000) err = 0x10000-dif;
  		else err = dif;
  		if (err == 0)
  		{
  			y_divide = y;
  			break;
  		}
  		else if (err < ErrorOptimal)
  		{
  			ErrorOptimal = err;
  			y_divide = y;
  		}
  	}
  	x_divide = ((uint64_t)y_divide * Freq *(channel*wordwidth)* N * 2)/i2s_clk;
  	if(x_divide >= 256) x_divide = 0xFF;
  	if(x_divide == 0) x_divide = 1;
  
  	if (TRMode == I2S_TX_MODE)// Transmitter
  	{
  		I2Sx->I2STXBITRATE = N-1;
  		I2Sx->I2STXRATE = y_divide | (x_divide << 8);
  	} else //Receiver
  	{
  		I2Sx->I2SRXBITRATE = N-1;
  		I2Sx->I2STXRATE = y_divide | (x_divide << 8);
  	}
  	return SUCCESS;
  }
  
  /********************************************************************//**
   * @brief		I2S set bitrate
   * @param[in]	I2Sx I2S peripheral selected, should be: LPC_I2S
   * @param[in]	bitrate value will be set
   * 				bitrate value should be in range: 0 .. 63
   * @param[in]	TRMode is transmit/receive mode, should be:
   * 				- I2S_TX_MODE = 0: transmit mode
   * 				- I2S_RX_MODE = 1: receive mode
   * @return 		none
   *********************************************************************/
  void I2S_SetBitRate(LPC_I2S_TypeDef *I2Sx, uint8_t bitrate, uint8_t TRMode)
  {
  	CHECK_PARAM(PARAM_I2Sx(I2Sx));
  	CHECK_PARAM(PARAM_I2S_BITRATE(bitrate));
  	CHECK_PARAM(PARAM_I2S_TRX(TRMode));
  
  	if(TRMode == I2S_TX_MODE)
  	{
  		I2Sx->I2STXBITRATE = bitrate;
  	}
  	else
  	{
  		I2Sx->I2SRXBITRATE = bitrate;
  	}
  }
  
  /********************************************************************//**
   * @brief		Configuration operating mode for I2S
   * @param[in]	I2Sx I2S peripheral selected, should be: LPC_I2S
   * @param[in]	ModeConfig pointer to I2S_MODEConf_Type will be used to
   * 				configure
   * @param[in]	TRMode is transmit/receive mode, should be:
   * 				- I2S_TX_MODE = 0: transmit mode
   * 				- I2S_RX_MODE = 1: receive mode
   * @return 		none
   *********************************************************************/
  void I2S_ModeConfig(LPC_I2S_TypeDef *I2Sx, I2S_MODEConf_Type* ModeConfig,
  		uint8_t TRMode)
  {
  	CHECK_PARAM(PARAM_I2Sx(I2Sx));
  	CHECK_PARAM(PARAM_I2S_CLKSEL(ModeConfig->clksel));
  	CHECK_PARAM(PARAM_I2S_4PIN(ModeConfig->fpin));
  	CHECK_PARAM(PARAM_I2S_MCLK(ModeConfig->mcena));
  	CHECK_PARAM(PARAM_I2S_TRX(TRMode));
  
  	if (TRMode == I2S_TX_MODE) {
  		I2Sx->I2STXMODE &= ~0x0F; //clear bit 3:0 in I2STXMODE register
  		if (ModeConfig->clksel == I2S_CLKSEL_MCLK) {
  			I2Sx->I2STXMODE |= 0x02;
  		}
  		if (ModeConfig->fpin == I2S_4PIN_ENABLE) {
  			I2Sx->I2STXMODE |= (1 << 2);
  		}
  		if (ModeConfig->mcena == I2S_MCLK_ENABLE) {
  			I2Sx->I2STXMODE |= (1 << 3);
  		}
  	} else {
  		I2Sx->I2SRXMODE &= ~0x0F; //clear bit 3:0 in I2STXMODE register
  		if (ModeConfig->clksel == I2S_CLKSEL_MCLK) {
  			I2Sx->I2SRXMODE |= 0x02;
  		}
  		if (ModeConfig->fpin == I2S_4PIN_ENABLE) {
  			I2Sx->I2SRXMODE |= (1 << 2);
  		}
  		if (ModeConfig->mcena == I2S_MCLK_ENABLE) {
  			I2Sx->I2SRXMODE |= (1 << 3);
  		}
  	}
  }
  
  /********************************************************************//**
   * @brief		Configure DMA operation for I2S
   * @param[in]	I2Sx I2S peripheral selected, should be: LPC_I2S
   * @param[in]	DMAConfig pointer to I2S_DMAConf_Type will be used to configure
   * @param[in]	TRMode is transmit/receive mode, should be:
   * 				- I2S_TX_MODE = 0: transmit mode
   * 				- I2S_RX_MODE = 1: receive mode
   * @return 		none
   *********************************************************************/
  void I2S_DMAConfig(LPC_I2S_TypeDef *I2Sx, I2S_DMAConf_Type* DMAConfig,
  		uint8_t TRMode)
  {
  	CHECK_PARAM(PARAM_I2Sx(I2Sx));
  	CHECK_PARAM(PARAM_I2S_DMA(DMAConfig->DMAIndex));
  	CHECK_PARAM(PARAM_I2S_DMA_DEPTH(DMAConfig->depth));
  	CHECK_PARAM(PARAM_I2S_TRX(TRMode));
  
  	if (TRMode == I2S_RX_MODE) {
  		if (DMAConfig->DMAIndex == I2S_DMA_1) {
  			LPC_I2S->I2SDMA1 = (DMAConfig->depth) << 8;
  		} else {
  			LPC_I2S->I2SDMA2 = (DMAConfig->depth) << 8;
  		}
  	} else {
  		if (DMAConfig->DMAIndex == I2S_DMA_1) {
  			LPC_I2S->I2SDMA1 = (DMAConfig->depth) << 16;
  		} else {
  			LPC_I2S->I2SDMA2 = (DMAConfig->depth) << 16;
  		}
  	}
  }
  
  /********************************************************************//**
   * @brief		Enable/Disable DMA operation for I2S
   * @param[in]	I2Sx: I2S peripheral selected, should be: LPC_I2S
   * @param[in]	DMAIndex chose what DMA is used, should be:
   * 				- I2S_DMA_1 = 0: DMA1
   * 				- I2S_DMA_2 = 1: DMA2
   * @param[in]	TRMode is transmit/receive mode, should be:
   * 				- I2S_TX_MODE = 0: transmit mode
   * 				- I2S_RX_MODE = 1: receive mode
   * @param[in]	NewState is new state of DMA operation, should be:
   * 				- ENABLE
   * 				- DISABLE
   * @return 		none
   *********************************************************************/
  void I2S_DMACmd(LPC_I2S_TypeDef *I2Sx, uint8_t DMAIndex, uint8_t TRMode,
  		FunctionalState NewState)
  {
  	CHECK_PARAM(PARAM_I2Sx(I2Sx));
  	CHECK_PARAM(PARAM_FUNCTIONALSTATE(NewState));
  	CHECK_PARAM(PARAM_I2S_DMA(DMAIndex));
  	CHECK_PARAM(PARAM_I2S_TRX(TRMode));
  
  	if (TRMode == I2S_RX_MODE) {
  		if (DMAIndex == I2S_DMA_1) {
  			if (NewState == ENABLE)
  				I2Sx->I2SDMA1 |= 0x01;
  			else
  				I2Sx->I2SDMA1 &= ~0x01;
  		} else {
  			if (NewState == ENABLE)
  				I2Sx->I2SDMA2 |= 0x01;
  			else
  				I2Sx->I2SDMA2 &= ~0x01;
  		}
  	} else {
  		if (DMAIndex == I2S_DMA_1) {
  			if (NewState == ENABLE)
  				I2Sx->I2SDMA1 |= 0x02;
  			else
  				I2Sx->I2SDMA1 &= ~0x02;
  		} else {
  			if (NewState == ENABLE)
  				I2Sx->I2SDMA2 |= 0x02;
  			else
  				I2Sx->I2SDMA2 &= ~0x02;
  		}
  	}
  }
  
  /********************************************************************//**
   * @brief		Configure IRQ for I2S
   * @param[in]	I2Sx I2S peripheral selected, should be: LPC_I2S
   * @param[in]	TRMode is transmit/receive mode, should be:
   * 				- I2S_TX_MODE = 0: transmit mode
   * 				- I2S_RX_MODE = 1: receive mode
   * @param[in]	level is the FIFO level that triggers IRQ request
   * @return 		none
   *********************************************************************/
  void I2S_IRQConfig(LPC_I2S_TypeDef *I2Sx, uint8_t TRMode, uint8_t level) {
  	CHECK_PARAM(PARAM_I2Sx(I2Sx));
  	CHECK_PARAM(PARAM_I2S_TRX(TRMode));
  	CHECK_PARAM(PARAM_I2S_IRQ_LEVEL(level));
  
  	if (TRMode == I2S_RX_MODE) {
  		I2Sx->I2SIRQ |= (level << 8);
  	} else {
  		I2Sx->I2SIRQ |= (level << 16);
  	}
  }
  
  /********************************************************************//**
   * @brief		Enable/Disable IRQ for I2S
   * @param[in]	I2Sx I2S peripheral selected, should be: LPC_I2S
   * @param[in]	TRMode is transmit/receive mode, should be:
   * 				- I2S_TX_MODE = 0: transmit mode
   * 				- I2S_RX_MODE = 1: receive mode
   * @param[in]	NewState is new state of DMA operation, should be:
   * 				- ENABLE
   * 				- DISABLE
   * @return 		none
   *********************************************************************/
  void I2S_IRQCmd(LPC_I2S_TypeDef *I2Sx, uint8_t TRMode, FunctionalState NewState) {
  	CHECK_PARAM(PARAM_I2Sx(I2Sx));
  	CHECK_PARAM(PARAM_FUNCTIONALSTATE(NewState));
  
  	if (TRMode == I2S_RX_MODE) {
  		if (NewState == ENABLE)
  			I2Sx->I2SIRQ |= 0x01;
  		else
  			I2Sx->I2SIRQ &= ~0x01;
  		//Enable DMA
  
  	} else {
  		if (NewState == ENABLE)
  			I2Sx->I2SIRQ |= 0x02;
  		else
  			I2Sx->I2SIRQ &= ~0x02;
  	}
  }
  
  /********************************************************************//**
   * @brief		Get I2S interrupt status
   * @param[in]	I2Sx I2S peripheral selected, should be: LPC_I2S
   * @param[in]	TRMode is transmit/receive mode, should be:
   * 				- I2S_TX_MODE = 0: transmit mode
   * 				- I2S_RX_MODE = 1: receive mode
   * @return 		FunctionState	should be:
   * 				- ENABLE: interrupt is enable
   * 				- DISABLE: interrupt is disable
   *********************************************************************/
  FunctionalState I2S_GetIRQStatus(LPC_I2S_TypeDef *I2Sx,uint8_t TRMode)
  {
  	CHECK_PARAM(PARAM_I2Sx(I2Sx));
  	if(TRMode == I2S_TX_MODE)
  		return ((FunctionalState)((I2Sx->I2SIRQ >> 1)&0x01));
  	else
  		return ((FunctionalState)((I2Sx->I2SIRQ)&0x01));
  }
  
  /********************************************************************//**
   * @brief		Get I2S interrupt depth
   * @param[in]	I2Sx I2S peripheral selected, should be: LPC_I2S
   * @param[in]	TRMode is transmit/receive mode, should be:
   * 				- I2S_TX_MODE = 0: transmit mode
   * 				- I2S_RX_MODE = 1: receive mode
   * @return 		depth of FIFO level on which to create an irq request
   *********************************************************************/
  uint8_t I2S_GetIRQDepth(LPC_I2S_TypeDef *I2Sx,uint8_t TRMode)
  {
  	CHECK_PARAM(PARAM_I2Sx(I2Sx));
  	if(TRMode == I2S_TX_MODE)
  		return (((I2Sx->I2SIRQ)>>16)&0xFF);
  	else
  		return (((I2Sx->I2SIRQ)>>8)&0xFF);
  }
  /**
   * @}
   */
  
  #endif /* _I2S */
  
  /**
   * @}
   */
  
  /* --------------------------------- End Of File ------------------------------ */
  
  