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Altera_Forum
Honored Contributor I
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wm8731 AUDIO codec

Help !!!, Does anyone how to use the audio codec on 8731 with vhdl and without NIOS processor ? help me please, I need to generate a single tones with this codec.......:confused:

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Altera_Forum
Honored Contributor I
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Copy from a post of user trieutan ( my old nick :cool: ) 

 

ROM= 16'h0c00; //power down ROM= 16'h0ec2; //master ROM= 16'h0838; //sound select ROM= 16'h1000; //mclk ROM= 16'h0017; // ROM= 16'h0217; // ROM= {8'h04,1'b0,vol}; // ROM= {8'h06,1'b0,vol}; //sound vol //ROM= 16'h1e00; //reset ROM= 16'h1201;//active  

 

First and foremost you should understand the software control interface (using I2C). one write sequence require 3 bytes : 7-bit slave address ( 0x34 ), 1write bit ( 0 ), 7-bit register address, followed by 9-bit data. 

 

at page 46 of the datasheet, you could find Table 29:Mapping of Program Registers 

 

ROM[0]= 16'h0c00; //power down , R6 : enable power for all modules 

ROM[1]= 16'h0ec2; //master R7: used inverted BCLK, Master mode, I2S format, MSB-first left-1 justified 

 

I believe you could easily understand the rest of the configuration. 

After configuring WM8731, you need to activate it by this one 

ROM[`rom_size]= 16'h1201;//active 

 

btw, For the I2sound demonstration WM8731 is configured in the sidetone mode ( directly route from mic to headphone ). If you want to make the codec speak audio from PCM like wav file, you probably want to see the configuration in SDcard to music demonstration.
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