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24 bit sample TLV320AIC3204 and I2S read.

Idoia Mazkiaran
Prodigy 200 points
Other Parts Discussed in Thread: TLV320AIC3204, TMS320C5505

I want to obtain a 24 bit value from ADC TLV320AIC3204, I configure it with 32 bit value: AIC3204_rset( 27, 3 );      // 32 bit audio word

and then I want to read it with the I2S.

I apply a big gain to a senoidal signal, I get a saturation in the peaks of the signal when I read from I2S, because I have only the value of the rx register I2S0RXLT1, but in the I2S0RXLT0 register I get only zero value.

The DSP controlling the ADC is the TMS320C5505.

  • 0
    Prodigy 200 points

    For programming the I2S communication it is programmed:

    AIC3204_rset( 27, 0x3d );  // BCLK and WCLK are set as o/p; AIC3204(Master)

     AIC3204_rset( 30, 0x84 );  // For 32 bit clocks per frame in Master mode ONLY
                                   // BCLK=DAC_CLK/N =(12288000/4) = 3.072MHz = 32*2*fs

    but the ADC only gets 16 bit converted data.