BC41B143A-DS-003PC Datasheet, PDF (41/94 Pages) List of Unclassifed Manufacturers – BlueCore 4-ROM Plug-n-Go Single Chip Bluetooth v2.0 + EDR System

9.3 BlueCore Virtual Machine Stack
CSR Bluetooth Software Stacks
Host (Optional)
USB
UART
VM Application Software
RFCOMM
SDP
L2CAP
HCI
LM
LC
48KB RAM
Baseband
MCU
Host I/O
Radio
PCM I/O
Figure 9.3: Virtual Machine
In Figure 9.3, this version of the stack firmware shown requires no host processor (but it can use a host processor for
debugging, etc.). All software layers, including application software, run on the internal RISC processor in a protected
user software execution environment known as a Virtual Machine (VM).
The user may write custom application code to run on the BlueCore VM using BlueLab SDK supplied with the BlueLab
Multimedia and Casira development kits, available separately from CSR. This code will then execute alongside the
main BlueCore firmware. The user is able to make calls to the BlueCore firmware for various operations.
The execution environment is structured so the user application does not adversely affect the main software routines,
thus ensuring that the Bluetooth stack software component does not need re-qualification when the application is
changed.
Using the VM and the BlueLab SDK the user is able to develop applications such as a cordless handsfree kit or other
profiles without the requirement of a host controller. BlueLab is supplied with example code including a full
implementation of the handsfree profile.
Note:
Sample applications to control PIO lines can also be written with BlueLab SDK and the VM for the HCI stack.
BC41B143A-ds-003Pc
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© Cambridge Silicon Radio Limited 2005
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