Brainboxes Bluetooth Adapter BL-819 Guía para resolver problemas descargar pdf (Pagina 13)

BT RS232 Troubleshooting

Guide

© Copyright Brainboxes Limited 2005 Page 13 of 16

Question Description Solution

What is the difference between

BCSP and H4?

If you have a BCSP device and require

a H4 card (or vice versa), please

contact [email protected] as

we have H4 versions of all our

Bluetooth products (with the exception

of BL-521, which is in neither mode)

H4 is the standard way of transmitting

Bluetooth data over a UART as defined

in the Bluetooth specifications. The

majority of software stacks from

independent vendors will communicate

with our products in H4 mode without

any additional modification to the stack.

BCSP is a proprietary CSR protocol

(more details below), thus for a

software stack to communicate with

our products in BCSP mode, it must

have a BCSP module written for it -

either by the vendor, or by the user.

To support flexible partitioning of

software between the host and the

Bluetooth subsystem, and to enhance

the speed of product design, CSR

offers a multi-protocol communications

link known as BlueCore Serial Protocol

(BCSP). BCSP provides a more

sophisticated option than currently

defined Bluetooth serial protocols:

H4/UART or H3/RS232.

(CSR does not support H3/RS232

because of its high host memory and

processing requirements.)

BCSP adds error checking and

retransmission to accommodate any

dropped data during 'wake-up', and

flow control for several logical

channels, while simultaneously

reducing the processing overhead. It

allows developers to link at HCI,

L2CAP, RFCOMM, or SDP layers,

providing flexibility for companies that

have already begun software

development.

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