TWRVF65GS10:I2S slave configuration issue

manjug — Thu, 25 Dec 2014 16:24:31 GMT

Hi,

I'm configuring I2S as receive slave for receiving audio from source which provides Bitclock ,Wordsync and raw audio. I'm using DMA based data transfer.Using MQX RTOS.

Below is my configuration code:

_mqx_int init_I2S()

{

_mqx_int errcode = 0;

_mqx_int param = 0;// temp;

char* modeString = NULL;

MQX_FILE_PTR i2s_ptr = NULL;

_mqx_uint type=IO_IOCTL_I2S_SET_MODE_SLAVE;

uint8_t mode = (I2S_RX_MASTER | I2S_RX_SLAVE);

I2S_STATISTICS_STRUCT stats;

AUDIO_DATA_FORMAT audio_format;

audio_format.ENDIAN = AUDIO_LITTLE_ENDIAN;

audio_format.ALIGNMENT = AUDIO_ALIGNMENT_LEFT;

audio_format.BITS = 32;

audio_format.SIZE = 1;

audio_format.CHANNELS = 2;

if ((i2s_ptr = fopen("sai:", NULL)) == NULL)

{

printf(" Error: Unable to open a device \n");

return ;

}

printf("I2S Open Success\n");

result = ioctl(i2s_ptr, type, &mode);

if(result==I2S_OK)

{

printf("Mode Success\n");

}

else

{

printf("Mode Error = %02x\n",result);

}

if (ioctl(i2s_ptr, IO_IOCTL_AUDIO_SET_IO_DATA_FORMAT, &audio_format) != I2S_OK)

{

printf(" Error: Input data format not supported.\n");

fclose(i2s_ptr);

}

I'm using PTB0(SAI2_RX_BCLK),PTB1(SAI2_RX_DATA), and PTB2(SAI2_RX_SYNC).J8 header pin 38,39 and 40.

Below is the init_gpio.c code :

_mqx_int _bsp_sai_io_init

(

_mqx_uint dev_num

)

{

switch(dev_num)

{

case 0: // SAI0

CCM_CSCMR1 = (CCM_CSCMR1 & ~CCM_CSCMR1_SAI0_CLK_SEL_MASK) | CCM_CSCMR1_SAI0_CLK_SEL(3);

CCM_CSCDR1 = (CCM_CSCMR1 & ~CCM_CSCDR1_SAI0_DIV_MASK) | CCM_CSCDR1_SAI0_DIV(0x0f);

CCM_CSCDR1 |= CCM_CSCDR1_SAI0_EN_MASK;

// RX_BCLK

//IOMUXC_SW_MUX_CTL_PAD_PAD_11 = IOMUXC_SW_MUX_CTL_PAD_PAD_MUX_MODE(5) | IOMUXC_SW_MUX_CTL_PAD_PAD_IBE_MASK;

// RX_DATA

//IOMUXC_SW_MUX_CTL_PAD_PAD_12 = IOMUXC_SW_MUX_CTL_PAD_PAD_MUX_MODE(5) | IOMUXC_SW_MUX_CTL_PAD_PAD_IBE_MASK;

// RX_SYNC

//IOMUXC_SW_MUX_CTL_PAD_PAD_13 = IOMUXC_SW_MUX_CTL_PAD_PAD_MUX_MODE(5) | IOMUXC_SW_MUX_CTL_PAD_PAD_IBE_MASK;

// TX_SYNC

IOMUXC_RGPIO(98) = IOMUXC_SW_MUX_CTL_PAD_PAD_MUX_MODE(1) | IOMUXC_SW_MUX_CTL_PAD_PAD_DSE(7) |

IOMUXC_SW_MUX_CTL_PAD_PAD_PUS(1) | IOMUXC_SW_MUX_CTL_PAD_PAD_PKE_MASK | IOMUXC_SW_MUX_CTL_PAD_PAD_PUE_MASK | IOMUXC_SW_MUX_CTL_PAD_PAD_OBE_MASK;

// TX_DATA

IOMUXC_RGPIO(96) = IOMUXC_SW_MUX_CTL_PAD_PAD_MUX_MODE(1) | IOMUXC_SW_MUX_CTL_PAD_PAD_DSE(7) |

IOMUXC_SW_MUX_CTL_PAD_PAD_PUS(1) | IOMUXC_SW_MUX_CTL_PAD_PAD_PKE_MASK | IOMUXC_SW_MUX_CTL_PAD_PAD_PUE_MASK | IOMUXC_SW_MUX_CTL_PAD_PAD_OBE_MASK;

// TX_BCLK

IOMUXC_RGPIO(93) = IOMUXC_SW_MUX_CTL_PAD_PAD_MUX_MODE(1) | IOMUXC_SW_MUX_CTL_PAD_PAD_DSE(7) | \

IOMUXC_SW_MUX_CTL_PAD_PAD_PUS(1) | IOMUXC_SW_MUX_CTL_PAD_PAD_PKE_MASK | IOMUXC_SW_MUX_CTL_PAD_PAD_PUE_MASK | IOMUXC_SW_MUX_CTL_PAD_PAD_OBE_MASK;

break;

case 2:

// RX_DATA PTB1

IOMUXC_RGPIO(23) = IOMUXC_SW_MUX_CTL_PAD_PAD_MUX_MODE(5) | IOMUXC_SW_MUX_CTL_PAD_PAD_IBE_MASK;

/*Daisy chain Selecting Pad: PTB1 for Mode: ALT5 (SAI2_RX_DATA)*/

IOMUXC_SAI2_IPP_IND_SAI_RXDATA_0_SELECT_INPUT = 0x01;

// SAI2_RX_BCLK PTB0

IOMUXC_RGPIO(22) = IOMUXC_SW_MUX_CTL_PAD_PAD_MUX_MODE(5) | IOMUXC_SW_MUX_CTL_PAD_PAD_IBE_MASK;

/*Daisy chain Selecting Pad: PTB0 for Mode: ALT5 (SAI2_RX_BCLK)*/

IOMUXC_SAI2_IPP_IND_SAI_RXBCLK_SELECT_INPUT = 0x01;

// SAI2_RX_SYNC PTB2

IOMUXC_RGPIO(24) = IOMUXC_SW_MUX_CTL_PAD_PAD_MUX_MODE(5) | IOMUXC_SW_MUX_CTL_PAD_PAD_IBE_MASK;

/*Daisy chain Selecting Pad: PTB2 for Mode: ALT5 (SAI2_RX_SYNC)*/

IOMUXC_SAI2_IPP_IND_SAI_RXSYNC_SELECT_INPUT = 0x01;

break;

default:

break;

}

return MQX_OK;

}

When i start receving using DMA mode it hangs at ioctl(i2s_ptr, IO_IOCTL_I2S_WAIT_RX_EVENT, NULL);

Re: TWRVF65GS10:I2S slave configuration issue

naoumgitnik — Fri, 02 Jan 2015 18:34:13 GMT

Dear Manju,

Have you looked at the Re: I2s capture in vybrid is noisy thread, please?

It looks like the problem is different in that thread than yours and most likely not related to the I2S interface; therefore, quite likely the approach and settings used there might work for you.

Sincerely, Naoum Gitnik.

Re: TWRVF65GS10:I2S slave configuration issue

McuG — Wed, 16 Mar 2016 20:51:41 GMT

Dear Manju,

I know it is an old question, since not closed, were you able to identify the issue ? We are facing a similar failure mode.

Gabriel

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