File content as of revision 0:d920d64db582:

/***********************************************************************//**
 * @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 ------------------------------ */