Using audio codec on M5329EVB

[will76]

Hi all,

I have stereo input and output jacks on my M5329EVB. I also have a touchscreen device interfacing with the evaluation board. What I would like to do is just making a sound whenever I touch the screen. I'm working with µCLinux (Linux-2.6.17.7)
I know that my fire engine has a TLV320AIC23B stereo codec but I don't really know how to use it. I've read in documentation that it supports SPI, SSI serial communication. But how can I activate it ? Does anybody have a clue ?
Thanks,
William

[DavidS]

Hi William,

Freescale is going to add the touch screen example in the LTIB BSP for the M5329EVB (http://www.freescale.com/webapp/sps/site/overview.jsp?nodeId=0127260061033202A9) and release it in October time frame (I think). 

The current LTIB BSP supports driving the audio codec and will even play MP3 files.

Nice touch (sorry for pun) for wanting to have touch screen generate a sound.  I may pilliage that idea and see if we can implement that too :smileywink:

Please note that the Rev D and older versions of the M5329EVB had errata for the codec.  The codec part on the evb only would played/output audio and the microphone input would not work.  I believe new revision of the evb will have the correct codec part number to enable audio input too.

The audio codec interfaces to the MCF5329 via SSI (I2S).

Here is code snippet for initializing the I2S interface:

/*-------------------------------------------------------------------------*/
/*!
 * \brief Initializes the Audio controller.
 *
 * \b Purpose:
 *   This function is called to intialize the Audio hardware
 *   and prepare it for use.
 *
 * \param base
 *   The address of the Audio controller.
 *
 * \return True upon success, false otherwise.
 */
/*-------------------------------------------------------------------------*/
static uint32 audio_init(void)
{
 uint16 temp16;
 uint32 index;

 /********************************/
 /* Setup the SPI - control link */
 /********************************/

 /* QSPI does not operate in slave mode.  Set to master. */
 temp16 = MCF_QSPI_QMR_MSTR |
   MCF_QSPI_QMR_BITS(0x000) ; // 16 bit xfers
//   MCF_QSPI_QMR_CPOL |        // Clock plarity
//    MCF_QSPI_QMR_CPHA;         // leading edge of CLK

 /* Lets pick 300kHz clock for now */
 temp16 |= MCF_QSPI_QMR_BAUD(133);

 MCF_QSPI_QMR = temp16;
// printf("QMR: 0x%04x\n", temp16);

 temp16 = MCF_QSPI_QIR_WCEF |
   MCF_QSPI_QIR_SPIFE |
   MCF_QSPI_QIR_ABRT |
   MCF_QSPI_QIR_SPIF;   // Clear interrupts
 MCF_QSPI_QIR = temp16;
// printf("QIR: 0x%04x\n", temp16);

 /* Enable the QSPI pins */
 MCF_GPIO_PAR_QSPI = ( 0
       | MCF_GPIO_PAR_QSPI_PAR_SCK(3)
       | MCF_GPIO_PAR_QSPI_PAR_DOUT(3)
       | MCF_GPIO_PAR_QSPI_PAR_DIN(3)
       | MCF_GPIO_PAR_QSPI_PAR_PCS0(3)
       | MCF_GPIO_PAR_QSPI_PAR_PCS1(3)
       | MCF_GPIO_PAR_QSPI_PAR_PCS2(3) );

// printf("GPIO_PAR_QSPI: 0x%04x\n", temp16);

 /********************************/
 /*  Setup the I2S - data link   */
 /********************************/

 /* Enable SSI clock in CCM */
 MCF_CCM_CDR = MCF_CCM_CDR_SSIDIV(10); // DES changed from 40 to 4 = 12MHz MCLK

 /* Issue a ColdFire SSI module reset and then enable the module for programming/initialization */
 MCF_SSI_CR &= ~MCF_SSI_CR_SSI_EN;  //DES Disable SSI module

 /* SSI module uses internal CPU clock */
 MCF_CCM_MISCCR |= MCF_CCM_MISCCR_SSI_SRC;

 MCF_SSI_CR =
   MCF_SSI_CR_I2S(1)  |  // Set I2S master mode
//   MCF_SSI_CR_I2S(2)  |  // Set I2S slave mode
   MCF_SSI_CR_MCE  |  // Set clock out on SSI_MCLK pin
   MCF_SSI_CR_SYN  |  // Enable synchronous mode
//   MCF_SSI_CR_NET  |  // Enable network mode
   MCF_SSI_CR_TCH;    // Enable two channel mode

 MCF_SSI_TCR =
//   MCF_SSI_TCR_TXBIT0 |  // 0=shift from msb; 1=shift from lsb - DES doesn't seem to do anything if used
   MCF_SSI_TCR_TFEN0 |  // TX FIFO 1 enabled
   MCF_SSI_TCR_TFEN1 |  // TX FIFO 0 enabled
   MCF_SSI_TCR_TFDIR |  // internally generated frame sync
   MCF_SSI_TCR_TXDIR |  // internally generated bit clock
//   MCF_SSI_TCR_TSHFD |  // Transmit shift; 0=msb first, 1=lsb first - DES this does make difference if used
   MCF_SSI_TCR_TSCKP ;   // Clock polarity: 0=clk data on rising edge; 1=clk data on falling edge
//   MCF_SSI_TCR_TFSI  |   // Frame sync active during transmission: 0=high; 1=low
//   MCF_SSI_TCR_TFSL  |  //Transmit frame sync length: 0=one word; 1=one bit
//   MCF_SSI_TCR_TEFS;    // TX early frame sync: 0=TX at first bit; 1= TX 1 bit before data

 MCF_SSI_CCR = MCF_SSI_CCR_WL(7)  |  // 16 bit word length
   MCF_SSI_CCR_DC(1) |   // Frame rate divider - DES DC=1 really mean two words per frame
   MCF_SSI_CCR_PM(15);   // using equations in section 24.4.2.2 in MCF5329RM.pdf
//   MCF_SSI_CCR_DIV2;   // 0=bypass; 1=divide by 2
//   MCF_SSI_CCR_PSR;   // Prescaler: 0=bypass; 1=divide clk by 8

 MCF_SSI_TMASK = MCF_SSI_TMASK_SSI_TMASK(0xfffffffc); //DES Transmit only on time slots 1&2

 MCF_SSI_IER = 0; //DES clear/disable interrupts and DMA
 
 MCF_SSI_CR |= MCF_SSI_CR_SSI_EN; //Enable SSI module

 /* Enable the SSI pins */
 MCF_GPIO_PAR_SSI = ( 0
       | MCF_GPIO_PAR_SSI_PAR_MCLK
       | MCF_GPIO_PAR_SSI_PAR_TXD(3)
       | MCF_GPIO_PAR_SSI_PAR_RXD(3)
       | MCF_GPIO_PAR_SSI_PAR_FS(3)
       | MCF_GPIO_PAR_SSI_PAR_BCLK(3) );

 codec_write(TLV320_RESET_REG, 0x000);
 codec_write(TLV320_RESET_REG, 0x000);
 codec_write(TLV320_RESET_REG, 0x000);
 codec_write(TLV320_RESET_REG, 0x000);
 for (index = 0; index < 1000; index++)
 {
   asm(nop);  //DES
 }

 codec_write(TLV320_POWER_DOWN_CTL, 0x067);  // Turn off: [CLK,OSC,ADC,MIC,LINE]  Turn on:[OUT,DAC]
 codec_write(TLV320_DIGITAL_IF_FMT_CTL, 0x00c);  // DES Set DIN I2S, Slave...setting LRSWAP does swap right and left...so does setting LRP
 codec_write(TLV320_DIGITAL_APATH_CTL, 0x001);  // DES: was 0x000 Set A path...As long as DACM 0 I hear audio
 codec_write(TLV320_SAMPLE_RATE_CTL, TLV320_SAMPLE_22KHZ + TLV320_Sample_USB);  // Set sample rate Guess for now
 codec_write(TLV320_ANALOG_APATH_CTL, 0x012);  //DES (012)added this line...i.e. it wasn't here before
 codec_write(TLV320_DIGITAL_IF_ACT, 0x001);  // Activate Dig IF

 return ERR_NO_ERROR;

} /* end init() */

Regards,

David

[will76]

Hi David,

You're saying that the current LTIB BSP Linux supports driving the audio codec and will even play MP3 files.I've looked through directories and found m5329_audio.c file (the path is .../Ltib/rpm/BUILD/linux-2.6.17.7/drivers/spi/) It is also using SPI to interface with TLV320AIC23B.
Is it the right file to initialize the communication ?
Besides, I can't find the mp3player application in LTIB BSP. How can I build this application?
Best regards,
William