Now, it's time to see how we can practically manage a sound device and how we can add an addition audio codec to the system using the CPU's audio interface directly.
In order to show how we can connect a codec to an embedded kit, we can use the development board reported in the following image, which is based on the chip WM8731:
Note
The devices can be purchased at http://www.cosino.io/product/audio-codec-i2si2c or by surfing the Internet.
Here is the URL where we can get the datasheet of the board:
While the datasheet of the codec chip WM8731 is found here:
https://www.cirrus.com/jp/pubs/proDatasheet/WM8731_v4.9.pdf.
To do this test, we will use the SAMA5D3 Xplained board, and here is the circuitry needed to connect the board:
Then, we need to do the next modifications to the SAMA5D3 Xplained's DTS file:
--- a/arch/arm...