User`s manual

High Performance Low Cost Embedded Systems
Audio Interface
The S3C2440 has an I2S bus interface, it can be connected to an external 8/16 bit stereo CODEC.
The mini2440 uses the I2S based UDA1341 chip to implement audio decode/encode system. This
chip’s registers’ setting and initialization are controlled by the L3-bus. Here we adopted
SAMSUNG’s design by using CPU’s GPB2, GPB3 and GPB4 to simulate the L3-Bus’s standard
L3MODE, L3DATA, L3CLOCK. After they initialize the UDA1341 they will be idle. What these
three control lines do can be implemented by a common single chip computer too. The audio
system’s output is a 3.5 mm phone plug.
The input has two channels, one is an on-board microphone, the other is extended through
CON10’s 2.0mm white phone plug. These two audio input channels are driven by different drivers.
Currently only the CON10 channel can be used to record audio.
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