AM3352 I2S

Hi Ryan,

Which specification are you referring to and how do you measure this? And what is your question?

Hi, Biser

    Sorry, I forget to add picture. Measurement data and datesheet is not the same.

    Signal measurement is as follows:

     pic1:

    Datasheet date:

     pic2:

You have your BCLK inverted. You are measuring from the wrong edge.

Regards

Wolfgang

HI Birse,
 Discuss with your detailed FAE, testing is OK, but there's a new problem:
 static struct snd_platform_data am335x_evm_snd_data1 = {
 .tx_dma_offset = 0x46400000, /* McASP1 */
 .rx_dma_offset = 0x46400000,
 .op_mode = DAVINCI_MCASP_IIS_MODE,

 Set Mode IIS mode, but the feeling is DSP measurement signal, your EVM borad the signal the same way, if you can confirm it?

Hmm... the original McASP driver can only to DSP mode.

Check the attached driver code for extensions to the other sound formats.

regards

Wolfgang

Hi, Wolfgang
 Thank you for your help.
 On SDK 6.0, Modify Kernel:sound/soc/davinci/davinci-mcasp.c
 #define AUDIO_FORMAT (SND_SOC_DAIFMT_I2S | \
  SND_SOC_DAIFMT_CBM_CFM | SND_SOC_DAIFMT_IB_NF)
 modify to I2S Mode
 Then use your attached driver code(davinci-mcasp.c)
 build OK and use the new image
 but line out failed, error info:
 aplay Test.wav
 Playing WAVE 'Test.wav' : S[  173.319508] asoc: machine hw_params failed
 igned 16 bit Little Endian, Rate 44100 Hz, Stereo
 aplay: set_params:1145: Unable to install hw params:
 ACCESS:  RW_INTERLEAVED
 FORMAT:  S16_LE
 SUBFORMAT:  STD
 SAMPLE_BITS: 16
 FRAME_BITS: 32