PM0237 datasheet(46/88 Pages) STMICROELECTRONICS

46 / 88 page

Design an application using BlueNRG, BlueNRG-MS ACI APIs

PM0237

46/88

DocID027104 Rev 2

Figure 9. MAC address storage

Alternatively, the MAC address can be stored in a free area of the BlueNRG and BlueNRG-

MS devices Information register (IFR) region, but this does not offer any advantage, since:

•

Programming of the MAC in the IFR requires several SPI transaction as follows:

–

Make the device entering Updater mode (1 SPI transaction)

–

Program the device IFR with MAC address (1 SPI transaction)

–

Make the device leaving Updater mode (1 SPI transaction)

•

Access to the MAC address during device initialization (at each power-up or reset)

requires several SPI transaction as follows:

–

Make the device entering Updater mode (1 SPI transaction)

–

Read MAC address from the device IFR (1 SPI transaction)

–

Make the device leaving Updater mode (1 SPI transaction)

BLE standard can also use "random" addresses which are defined by users, and they do not

follow the public addresses rules. The random addresses are handled autonomously by the

device, are set at each reset but they can also be overwritten by the external processor

using the hci_le_set_random_address()API.

Private addresses are used when privacy is enabled and according to the Bluetooth low

energy specification. For more information about private addresses, refer to Section 1.7:

Security Manager (SM).

PM0237 Datenblatt(PDF) 46 Page - STMicroelectronics