BLUECORE4-ROM datasheet(44/89 Pages) ETC

44 / 89 page

CSR Bluetooth Software Stacks

BC41B143A-ds-002Pd

This material is subject to CSR’s non-disclosure agreement

Production Information

Page 44 of 89

9.1.2

Key Features of the HCI Stack - Extra Functionality

The firmware extends the standard Bluetooth functionality with the following features:

Supports BlueCore Serial Protocol (BCSP) – a proprietary, reliable alternative to the standard Bluetooth

UART Host Transport

Provides a set of approximately 50 manufacturer-specific HCI extension commands. This command set

(called BCCMD – “BlueCore Command”) provides:

Access to the IC’s general-purpose PIO port

The negotiated effective encryption key length on established Bluetooth links

Access to the firmware’s random number generator

Controls to set the default and maximum transmit powers – these can help minimise interference

between overlapping, fixed-location piconets

Dynamic UART configuration

Radio transmitter enable/disable – a simple command connects to a dedicated hardware switch that

determines whether the radio can transmit

The firmware can read the voltage on pins AIO[2] and AIO[0]. This is normally used to build a

battery monitor

A block of BCCMD commands provides access to the persistent store (PS) configuration database.

The database sets the Bluetooth address, Class of Device, radio (transmit class) configuration,

SCO routing, LM and USB constants, etc.

A UART “break” condition can be used as follows:

Presenting a UART break condition to the IC can force the IC to perform a hardware reboot

Presenting a break condition at boot time can hold the IC in a low power state, preventing

normal initialisation while the condition exists

When using BCSP host transport, the firmware can be configured to send a break to the host

before sending data. This is normally used to wake the host from a deep sleep state

A block of “radio test” or BIST commands allows direct control of the IC’s radio. This can be used

during support Bluetooth qualification and factory testing.

Hardware low-power modes: shallow sleep and deep sleep. The IC drops into modes that significantly

reduce power consumption when the software goes idle.

SCO channels are normally routed via HCI (over BCSP). However, up to three SCO channels can be

routed over the single PCM port (at the same time as routing any remaining SCO channels over HCI).

Co-operative existence with 802.11b/g chipsets. The device can be optionally configured to support a

number of different co-existence schemes including:

TDMA – Bluetooth and WLAN avoid transmitting at the same time.

FDMA – Bluetooth avoids transmitting within the WLAN channel

Combination TDMA and FDMA – Bluetooth avoids transmitting in the WLAN channel only when

WLAN is active.

Refer to separate documentation for full details of the co-existence schemes that CSR supports.

Note:

Always refer to the Firmware Release Note for the specific functionality of a particular build.

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