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UM1865

ACI command data format

132

ACI command data format

When sending an ACI command to the BlueNRG-MS, the command must be formatted as

described in this chapter.

2.1

Overview

The BlueNRG-MS ACI commands utilize and extend the standard HCI data format. The

standard HCI data format is a part of the Bluetooth core specification. To avoid redundancy

and inconsistency, the texts are not copied into this document. Please refer to the official

Bluetooth specification, Volume 2, Part E, Chapter 5 for detailed information.

According to the Bluetooth specification, a standard HCI packet can be an:

HCI command packet

HCI ACL data packet

HCI synchronous data packet

HCI event packet

In the BlueNRG-MS, the HCI synchronous data packet is not supported, but the other three

are.

2.2

HCI command packet

When an external device gives a command to the BlueNRG-MS, the command must be

formatted in a HCI command packet. The BlueNRG-MS only receives the HCI command

packets, but does not transmit.

Figure 4. HCI command packet

Each HCI command uses a 2 byte OpCode to uniquely identify different types of

commands. The OpCode is divided into two fields: the OpCode Group Field (OGF) and the

OpCode Command Field (OCF). The OGF is the upper 6 bits and the remaining lower 10

bits are used by the OCF.

UM1865 Datasheet(PDF) 9 Page - STMicroelectronics