1
System Architecture
RF
Baseband
Link Manager
Audio L2CAP
Control
Data
RFCOMM
SDP IP
Applications
Bluetooth Protocol Stack
The Radio, Baseband and Link
Manager are on firmware. The
higher layers could be in software.
The interface is then through the
Host Controller (firmware and
driver). The HCI (Host Controller
Interface) interfaces between the
baseband and L2CAP provides a
command interface to the baseband
controller and link manager and
access to the hardware status and
control registers. The HCI
Interface defined for Bluetooth are
UART, RS232 and USB. Audio
Applications may directly use the
basband layer after encoding the
audio signals.
