Managing sound devices

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.

Adding an audio codec

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:

http://download.mikroe.com/documents/add-on-boards/other/audio-and-voice/audio-codec-proto/audio-codec-proto-manual-v100.pdf.

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...