WM8960 Audio Board
WORKING PROTOCOL
This module use WM8960 for audio encode/decode. WM8960 use I2C bus to
control signal and configures internal registers, I2S bus used to transmit/receive audio
signals.
I2C BUS
In I2C Bus, master device will first send an address frame for searching slave
device and setting communication mode. High 7 bits are address, followed a control
bit and finally the response signal. If slave device receives the response signal, it will
return a response to master device. Then master device could begin to send data to
slave device, which is 8 bits and the high 7 bits are address and the lowest one is
response signal. MSB first.
According to Datasheet, registers of WM8960 are 9-bit. Thus, when we send data
to it, should split data to two bytes and add the ID of register to recognized before
transmitting. The ID of register flagged by 7-bit.
For more details about I2C, please refer to Page 15 and Page 63 of WM8960_v4.2.
