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Related

Output Sinewave

Former Member
Former Member over 11 years ago

Hello

After doing a program that can read from line in a music from Computer and playing it in line out of zeadboard, now i want to do one experience. I want to just output in lineout a 1khz sinewave that i generate in C code.

Well i tried to do it but although i think i'm doing a correct implementation of a sinewave when i output it, the sound doesn't match.

I think probably the problem is in the input data of the function Xil_Out32.

The code i think is relevant i leave it below.


u32 audio;
float aux;

for(i=0;i<10000;i++){
t// Write audio output to codec
taux=sin(((2*M_PI)/(512))*i)+1;//512khz sample rate 1000hz freq
taudio=aux*pow(2,32);

Xil_Out32(I2S_DATA_TX_L_REG, audio);
Xil_Out32(I2S_DATA_TX_R_REG, audio);
}


Anyone knows what i'm doing wrong?
Thank you

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  • Former Member
    0 Former Member over 11 years ago

    From your comment I assume you want to update the value written to the audio ports at a 512 KHz rate, but I do not see any sort of time reference to sync your outputs to that rate.

     

    You may want to take a look at some other posts on Zedboard and audio for some ideas. Examples:

     

    http://zedboard.org/content/playing-adau1761-audio-codec

     

    http://zedboard.org/content/audio-zedboard

     

    http://zedboard.org/content/configure-adau1761-audio-codec-zynq-7000-ap-so

    -Gary

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  • Former Member
    0 Former Member over 11 years ago in reply to Former Member

    Well i'm using a code that its from an audio tutorial and there they comment in the code the following text:

    Configures audio codes's internal PLL. With MCLK = 10 MHz it configures the

    // PLL for a VCO frequency = 49.152 MHz, and an audio sample rate of 48 KHz.

    The problem is that i already tried use 48kHz and i still can't get th right output.

    I'm very confused and sorry for that

    Thanks for the help

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