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Audio Parameters for tlv320dac3100 to AM335x Sitara

VISWANATH KONDAPALLI
Expert 2095 points
Other Parts Discussed in Thread: TLV320DAC3100

I am new to the Audio related stuff : need help : any one please help me this --

From AM335x ACLK, FSX, AXR2, AXR3 are connected to Audio DAC - TLV320DAC3100 -- which is having headphone 3.5 jack and speaker.

AM335x - of -- ACLK -to - BCLK -of- codec

                           FSX   -- FSX  - codec

                          AXR2   -- DIN -- codec

                          AXR3  --   Dout -- but not connected -- left it as Test Point

                   CLKOUT1  -- MCLK of Codec   // i forgot this pin -- need to do pin muxing -- for this IO as CLOCK.

in the the device tree

op-mode = <0>;    /* MCASP_IIS_MODE */    -- do we need to change the parameters here op-mode
tdm-slots = <2>;                            
/* 4 serializers */
    serial-dir = <    /* 0: INACTIVE, 1: TX, 2: RX */    -- here i am having doubt -- is this parameter is correct
        1 0 0 0
    >;

Regards,

Viswanath K.

  • 0
    TI__Guru**** 161600 points

    Hi Viswanath,

    VISWANATH KONDAPALLI said:
    op-mode = <0>;    /* MCASP_IIS_MODE */    -- do we need to change the parameters here op-mode

    op-mode = 0 means that your MCASP will work in  I2S mode. This is used for  I2S, PCM and TDM protocols

    op-mode = 1 means DIT mode, used for S/PDIF protocol

    For your case op-mode = 0 is OK. 

    VISWANATH KONDAPALLI said:
        serial-dir = <    /* 0: INACTIVE, 1: TX, 2: RX */    -- here i am having doubt -- is this parameter is correct
            1 0 0 0
        >;

     

    This setting means that AXR0 is TX and all other serializers are INACTIVE.  Since you use AXR2 as TX, then in my opinion you should change this to: 
      serial-dir = <     /* 0: INACTIVE, 1: TX, 2: RX */
           0 0 1 0

      >; 

    Best Regards, 
    Yordan

  • 0 in reply to Yordan Kovachev
    Expert 2095 points
    Thank you for the reply Yordan.

    we are using serial-dir as <0 0 1 2> we will change to <0 0 1 0>.
  • 0 in reply to VISWANATH KONDAPALLI
    TI__Guru**** 161600 points
    Hi,

    Note that <0 0 1 0> will set only AXR2 as TX, AXR3 will be INACTIVE. Are you planning to use AXR3 as TX or RX? If yes, you should set it to 1 or 2 in the serial-dir parameter.

    Best Regards,
    Yordan
  • 0 in reply to Yordan Kovachev
    Expert 2095 points
    Thank you for the suggestion -- we are going to use <0 0 1 2 > //now we are not having RX(AXR3) -- no MIC. and for the future purpose we kept it as it is.

    I think in this post -- my doubts are clarified.