File content as of revision 0:63ed631d8c3a:

/***********************************************************************//**
 * @file        i2s_irq_test.c
 * @purpose        This example describes how to use I2S transfer in interrupt
 *                   mode
 * @version        2.0
 * @date        21. May. 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.
 **********************************************************************/
#include "lpc17xx_i2s.h"
#include "lpc17xx_libcfg.h"
#include "lpc17xx_pinsel.h"
#include "debug_frmwrk.h"
#include "lpc17xx_clkpwr.h"
#include "i2s_irq_test.h"
#include "mbed.h"



/* Example group ----------------------------------------------------------- */
/** @defgroup I2S_IRQ    I2S_IRQ
 * @ingroup I2S_Examples
 * @{
 */


/************************** PRIVATE VARIABLES ***********************/
uint8_t menu[]=
    "********************************************************************************\n\r"
    "Hello NXP Semiconductors \n\r"
    " I2S interrupt mode demo \n\r"
    "\t - MCU: mbed-005.1 LPC1768 \n\r"
    "\t - Core: ARM CORTEX-M3 \n\r"
    "\t - Communicate via: UART0 - 9600 bps \n\r"
    " Use two I2S channels in the same board to transfer data in interrupt mode\n\r"
    "********************************************************************************\n\r";

volatile uint8_t  I2STXDone = 0;
volatile uint8_t  I2SRXDone = 0;

volatile uint32_t *I2STXBuffer = (uint32_t*)(I2S_BUFFER_SRC);
volatile uint32_t *I2SRXBuffer = (uint32_t *)(I2S_BUFFER_DST);

volatile uint32_t I2SReadLength = 0;
volatile uint32_t I2SWriteLength = 0;

uint8_t tx_depth_irq = 0;
uint8_t rx_depth_irq = 0;
uint8_t dummy=0;


/************************** PRIVATE FUNCTIONS *************************/
void I2S_IRQHandler(void);

void Buffer_Init(void);
Bool Buffer_Verify(void);


/*----------------- INTERRUPT SERVICE ROUTINES --------------------------*/
/*********************************************************************//**
 * @brief        I2S IRQ Handler
 * @param[in]    None
 * @return         None
 **********************************************************************/
/*void I2S_IRQHandler()
{
    uint32_t RXLevel = 0;

    //Check RX interrupt
    if(I2S_GetIRQStatus(LPC_I2S, I2S_RX_MODE))
    {
        RXLevel = I2S_GetLevel(LPC_I2S, I2S_RX_MODE);
        if ( (RXLevel != RXFIFO_EMPTY) && !I2SRXDone )
        {
            while ( RXLevel > 0 )
            {
                if ( I2SReadLength == BUFFER_SIZE )
                {
                    //Stop RX
                    I2S_Stop(LPC_I2S, I2S_RX_MODE);
                    // Disable RX
                    I2S_IRQCmd(LPC_I2S, I2S_RX_MODE, DISABLE);
                    I2SRXDone = 1;
                    break;
                }
                else
                {
                    I2SRXBuffer[I2SReadLength++] = LPC_I2S->I2SRXFIFO;
                }
                RXLevel--;
            }
        }
    }
    return;
}
*/
/*-------------------------PRIVATE FUNCTIONS------------------------------*/
/*********************************************************************//**
 * @brief        Initialize buffer
 * @param[in]    None
 * @return         None
 **********************************************************************/
void Buffer_Init(void) {
    uint32_t i;
    for ( i = 0; i < BUFFER_SIZE; i++ ) 
    {
    I2STXBuffer[i] = i |(i << 16);
    I2SRXBuffer[i] = 0;
    }

}

/*-------------------------MAIN FUNCTION------------------------------*/
/*********************************************************************//**
 * @brief        mbed_i2s_init: Main program body
 * @param[in]    None
 * @return         int
 **********************************************************************/
// for mbed
void mbed_i2s_init(void){

    I2S_MODEConf_Type I2S_ClkConfig;
    I2S_CFG_Type I2S_ConfigStruct;
    PINSEL_CFG_Type PinCfg;
   // uint32_t i;
    /* Initialize debug via UART0
     * ? 115200bps
     * ? 8 data bit
     * ? No parity
     * ? 1 stop bit
     * ? No flow control
     */
    debug_frmwrk_init();
    
    //print menu screen
    //print_menu();

    /* Initialize I2S peripheral ------------------------------------*/
    /* Pin configuration:
     * Assign:     - P0.4 as I2SRX_CLK
     *             - P0.5 as I2SRX_WS
     *             - P0.6 as I2SRX_SDA
     *             - P0.7 as I2STX_CLK
     *             - P0.8 as I2STX_WS
     *             - P0.9 as I2STX_SDA
     */



    PinCfg.Funcnum = 1;
    PinCfg.OpenDrain = 0;
    PinCfg.Pinmode = 0;
    PinCfg.Pinnum = 4;
    PinCfg.Portnum = 0;
    PINSEL_ConfigPin(&PinCfg);
    PinCfg.Pinnum = 5;
    PINSEL_ConfigPin(&PinCfg);
    PinCfg.Pinnum = 6;
    PINSEL_ConfigPin(&PinCfg);
    PinCfg.Pinnum = 7;
    PINSEL_ConfigPin(&PinCfg);
    PinCfg.Pinnum = 8;
    PINSEL_ConfigPin(&PinCfg);
    PinCfg.Pinnum = 9;
    PINSEL_ConfigPin(&PinCfg);
    
    Buffer_Init();
    I2S_Init(LPC_I2S);  

    /* setup:
     *         - wordwidth: 16 bits
     *         - stereo mode
     *         - master mode for I2S_TX and slave for I2S_RX
     *         - ws_halfperiod is 31
     *         - not use mute mode
     *         - use reset and stop mode
     *         - select the fractional rate divider clock output as the source,
     *         - disable 4-pin mode
     *         - MCLK ouput is disable
     *         - Frequency = 44.1 kHz
     * Because we use mode I2STXMODE[3:0]= 0000, I2SDAO[5]=0 and
     * I2SRX[3:0]=0000, I2SDAI[5] = 1. So we have I2SRX_CLK = I2STX_CLK
     * --> I2SRXBITRATE = 1 (not divide TXCLK to produce RXCLK)
     */
    
    /* Audio Config*/
    I2S_ConfigStruct.wordwidth = I2S_WORDWIDTH_16;
    I2S_ConfigStruct.mono = I2S_STEREO;
    I2S_ConfigStruct.stop = I2S_STOP_ENABLE;
    I2S_ConfigStruct.reset = I2S_RESET_ENABLE;
    I2S_ConfigStruct.ws_sel = I2S_SLAVE_MODE;
    I2S_ConfigStruct.mute = I2S_MUTE_DISABLE;
    I2S_Config(LPC_I2S,I2S_TX_MODE,&I2S_ConfigStruct);
    
    I2S_ConfigStruct.ws_sel = I2S_SLAVE_MODE;
    I2S_Config(LPC_I2S,I2S_RX_MODE,&I2S_ConfigStruct);
    
    /* Clock Mode Config*/
    CLKPWR_SetPCLKDiv(CLKPWR_PCLKSEL_I2S,CLKPWR_PCLKSEL_CCLK_DIV_4);
    
    I2S_ClkConfig.clksel = I2S_CLKSEL_FRDCLK;
    I2S_ClkConfig.fpin = I2S_4PIN_DISABLE;
    I2S_ClkConfig.mcena = I2S_MCLK_DISABLE; 
    I2S_ModeConfig(LPC_I2S,&I2S_ClkConfig,I2S_TX_MODE);
    I2S_ModeConfig(LPC_I2S,&I2S_ClkConfig,I2S_RX_MODE);


    //I2S_FreqConfig(LPC_I2S, (uint16_t)44100, I2S_TX_MODE);
    I2S_SetBitRate(LPC_I2S, 0, I2S_TX_MODE); //FOR SLAVE MODE TX
    I2S_SetBitRate(LPC_I2S, 0, I2S_RX_MODE);
    
    I2S_Stop(LPC_I2S, I2S_TX_MODE);
    I2S_Stop(LPC_I2S, I2S_RX_MODE);
    


    
    NVIC_EnableIRQ(I2S_IRQn);
    
    /* RX FIFO depth is 1, TX FIFO depth is 8. */
    I2S_IRQConfig(LPC_I2S,I2S_TX_MODE,8);
    I2S_IRQConfig(LPC_I2S,I2S_RX_MODE,1);
    //I2S_IRQCmd(LPC_I2S,I2S_TX_MODE,ENABLE);
    
    
    


    I2S_Start(LPC_I2S);
    
}











#ifdef  DEBUG
/*******************************************************************************
* @brief        Reports the name of the source file and the source line number
*                 where the CHECK_PARAM error has occurred.
* @param[in]    file Pointer to the source file name
* @param[in]    line assert_param error line source number
* @return        None
*******************************************************************************/
void check_failed(uint8_t *file, uint32_t line)
{
    /* User can add his own implementation to report the file name and line number,
     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */

    /* Infinite loop */
    while(1);
}
#endif

/*
 * @}
 */