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DM355 daughter sound card problem

Azam Ansari
Prodigy 65 points

Hi All,

 

I am developing driver for daughter sound card on DM355.

 

I2C is working fine and the ioctl's are working fine but recording is not working.

 

There are 2 McBSP bus (McBSP1 and McBSP2) used for DMA transfer out of which McBSP1 is used for the sound daughter card.

Audio format is I2S.

Following is the configuration that I tried:

#define DEFAULT_BITPERSAMPLE         256

#define AUDIO_RATE_DEFAULT              8000

#define    AUDIO_MCBSP              DAVINCI_MCBSP1

McBSP1 is configured as slave for recording.

Below is configuration for McBSP1:

    .spcr2 = FREE | XINTM(3),
    .spcr1 = RINTM(3),
    .rcr2 = RWDLEN2(DAVINCI_MCBSP_WORD_16) | RDATDLY(1),
    .rcr1 = RFRLEN1(1) | RWDLEN1(DAVINCI_MCBSP_WORD_16),
    .xcr2 = XWDLEN2(DAVINCI_MCBSP_WORD_16) | XDATDLY(1) | XFIG,
    .xcr1 = XFRLEN1(1) | XWDLEN1(DAVINCI_MCBSP_WORD_16),
    .srgr1 = FWID(DEFAULT_BITPERSAMPLE - 1),
    .srgr2 = FSGM | FPER(DEFAULT_BITPERSAMPLE * 2 - 1),
    /* configure McBSP to be the I2S master */
    .pcr0 = FSXM | FSRM | CLKXM | CLKRM | CLKXP | CLKRP,

 

Daughter card is configured for 16bit word, 8000KHz and 256bits per sample.

 

But I don't get any interrupt for recording.

Please can anyone help to sort out the problem.

 

Thanks,

Azam.

  • 0
    TI__Mastermind 37340 points

    are you aware that there is an audio OSS Linux driver included with the DVSDK?  Our DM355 EVM has an AIC33 part along with the Linux driver to exercise audio.

  • 0 in reply to Juan Gonzales
    Prodigy 65 points

    Hello Gonzales,

     

    Thanks for the suggestion. I am already aware of the OSS driver layer that is present in for AIC33 with the DVSDK. I have modified the same driver for the daughter sound card that I am using. AIC33 uses McBSP2 for audio I2S transfer. But the sound daughter card that I am using uses McBSP1 which is connected to DC3 on the DM355 board. DEFAULT_BITPERSAMPLE sample is 16 in case of AIC33, but I have set it to 256.