Diff: I2S_Example/lpc17xx_i2s.c

Revision:

0:d920d64db582

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/I2S_Example/lpc17xx_i2s.c	Wed Mar 30 06:05:24 2011 +0000
@@ -0,0 +1,650 @@
+/***********************************************************************//**
+ * @file        lpc17xx_i2s.c
+ * @brief        Contains all functions support for I2S firmware library on LPC17xx
+ * @version        3.0
+ * @date        18. June. 2010
+ * @author        NXP MCU SW Application Team
+ **************************************************************************
+ * 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.
+ **********************************************************************/
+
+/* Peripheral group ----------------------------------------------------------- */
+/** @addtogroup I2S
+ * @{
+ */
+
+/* Includes ------------------------------------------------------------------- */
+//#include "mbed.h"
+#include "lpc17xx_i2s.h"
+#include "lpc17xx_clkpwr.h"
+#include "mbed.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; /* get bit[2] */
+    } else {
+        value = (I2Sx->I2SDAI) & 0x04; /* 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) {
+
+    /* Calculate bit rate
+     * The formula is:
+     *      bit_rate = channel*wordwidth - 1
+     * 48kHz sample rate for 16 bit stereo date requires
+     * a bit rate of 48000*16*2=1536MHz (MCLK)
+     */
+    uint32_t i2sPclk;
+    uint64_t divider;
+    uint8_t bitrate, channel, wordwidth;
+    uint32_t x, y;
+    uint16_t dif;
+    uint16_t error;
+    uint8_t x_divide, y_divide=0;
+    uint16_t ErrorOptimal = 0xFFFF;
+
+    CHECK_PARAM(PARAM_I2Sx(I2Sx));
+    CHECK_PARAM(PRAM_I2S_FREQ(Freq));
+    CHECK_PARAM(PARAM_I2S_TRX(TRMode));
+
+    i2sPclk = CLKPWR_GetPCLK(CLKPWR_PCLKSEL_I2S);
+    printf("I2S_PCLK = %dHz\r\n",i2sPclk);
+    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);
+    }
+    bitrate = channel * wordwidth - 1;
+    if (TRMode == I2S_TX_MODE)// Transmitter
+    {
+        I2Sx->I2STXBITRATE = bitrate;
+    } else //Receiver
+    {
+        I2Sx->I2SRXBITRATE = bitrate;
+    }
+    printf("TX CHANNEL= %d\r\n",i2s_GetChannel(I2Sx,I2S_TX_MODE));
+    printf("TX WORDWIDTH= %dbits \r\n",i2s_GetWordWidth(I2Sx,I2S_TX_MODE));
+    printf("I2STXBITRATE= %d,bitrate= %d \r\n",I2Sx->I2STXBITRATE,bitrate);
+    /* 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 * (X/Y) / 2
+     * We have:
+     *         I2S_MCLK = Freq * bit_rate;
+     * So: (X/Y) = (Freq * bit_rate)/PCLK*2
+     * We use a loop function to chose the most suitable X,Y value
+     */
+
+    divider = ((uint64_t)(Freq *( bitrate+1)/* * 2*/)<<16) / i2sPclk;
+    for (y = 255; y > 0; y--) {
+        x = y * divider;
+        dif = x & 0xFFFF;
+        if(dif>0x8000) error = 0x10000-dif;
+        else error = dif;
+        if (error == 0)
+        {
+            y_divide = y;
+            break;
+        }
+        else if (error < ErrorOptimal)
+        {
+            ErrorOptimal = error;
+            y_divide = y;
+        }
+    }
+    //y_divide--;//for test
+    x_divide = (y_divide * Freq *( bitrate+1)* 2)/i2sPclk;
+    if (TRMode == I2S_TX_MODE)// Transmitter
+    {
+        I2Sx->I2STXRATE = y_divide | (x_divide << 8);
+    } else //Receiver
+    {
+        I2Sx->I2SRXRATE = y_divide | (x_divide << 8);
+    }
+    
+    printf("I2STXRATE=%d, x_divide=%d, y_divide=%d \r\n",I2Sx->I2STXRATE,x_divide,y_divide);
+    return SUCCESS;
+}
+
+/********************************************************************//**
+ * @brief        I2S set bitrate
+ * @param[in]    I2Sx I2S peripheral selected, should be: LPC_I2S
+ * @param[in]    bitrate value will be set, it can be calculate as follows:
+ *                     bitrate = channel * wordwidth - 1
+ *                 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 ------------------------------ */