PM0237 datasheet(45/88 Pages) STMICROELECTRONICS

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PM0237

Design an application using BlueNRG, BlueNRG-MS ACI APIs

3.1.1

BLE addresses

The following device addresses are supported from BlueNRG and BlueNRG-MS devices:

•

Public address

•

Random address

•

Private address

Public MAC addresses (6 bytes- 48 bits address) uniquely identifies a BLE device, and they

are defined by Institute of Electrical and Electronics Engineers (IEEE).

The first 3 bytes of the public address identify the company that issued the identifier and are

known as the Organizationally Unique Identifier (OUI). An Organizationally Unique Identifier

(OUI) is a 24-bit number that is purchased from the IEEE. This identifier uniquely identifies a

company and it allows to reserve a block of possible public addresses (up to 2^24 coming

from the remaining 3 bytes of the public address) for the exclusive use of a company with a

specific OUI.

An organization/company can request a new set of 6 bytes addresses when at least the

95% of previously allocated block of addresses have been used (up to 2^24 possible

addresses are available with a specific OUI).

BlueNRG and BlueNRG-MS devices don't have a valid preassigned MAC address since the

MAC address is specific to manufacturers. The public address must be set by the external

processor.

The ACI command to set the MAC address is ACI_HAL_WRITE_CONFIG_DATA (opcode

0xFC0C) with command parameters as follow:

•

Offset: 0x00 (0x00 identify the BTLE public address, i.e. MAC address)

•

Length: 0x06 (Length of the MAC address)

•

Value: 0xaabbccddeeff (48 bit array for MAC address)

The command ACI_HAL_WRITE_CONFIG_DATA should be sent to BlueNRG and

BlueNRG-MS devices by the uC before starting BLE operations (after each power-up or

reset of BlueNRG).

The following pseudocode example illustrates how to set a public address:

uint8_t bdaddr[] = {0x12, 0x34, 0x00, 0xE1, 0x80, 0x02};

ret=aci_hal_write_config_data(CONFIG_DATA_PUBADDR_OFFSET,CONFIG_DATA_PUBAD

DR_LEN, bdaddr);

if(ret)PRINTF("Setting address failed.\n")}

MAC address needs to be stored somewhere in the non-volatile memory associated to the

product during product manufacturing.

A user can write its application assuming that the MAC address is placed at a known Flash

location of the microcontroller. During manufacturing, the microcontroller can be

programmed with the customer Flash image via JTAG.

A second step could involve generating the unique MAC address (i.e. reading it from a

database) and storing of the MAC address in the known location in a free 48 bits area of the

Flash.

When the microcontroller’s application needs to access the MAC address simply refers to

the known Flash memory location.

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