wm8731 AUDIO codec

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.