6 HCI Mode

The RNBD451 supports HCI mode. After transiting to HCI mode, the RNBD451 does not accept RN commands anymore and accepts only HCI commands.

• The scheme to switch to HCI mode:
  • The firmware determines the first received command is either in HCI format or is an RN command after reboot if RNBD451 has no HCI mode record in PDS.
    • Before mode determination, it will issue Bluetooth Low Energy ADV working as an RN application.
    • Disable the determination scheme when the Bluetooth Low Energy link is established, even if no command comes. It means that the RN application is running now, and the determination will be enabled again in next reboot.
  • Determine the scheme configuration.
    • The scheme can be configured by an RN command. For more details, refer to 5.2.23 Set HCI Determination (SH,<0,1>).
    • The default is to enable a mode switch scheme.
• HCI mode storage in PDS:

  • When

    it enters HCI mode by determining the command format, store it in PDS. After that, it will always be HCI mode, even after reboot.
  • There is an HCI vendor command to clear the record. For more details, refer to 6.1.9 HCI VND Mode Record Clear.