STM32WB Bluetooth® LE – Wireless Stack Information

1. STM32WB - Bluetooth^® LE Coprocessor Binaries

This is a description about the Bluetooth^® LE Wireless stack available for the secure CM0+ coprocessor of the STM32WB Most of the information can be found within the Release Note for STM32WBxx Copro Wireless Binaries. https://github.com/STMicroelectronics/STM32CubeWB/tree/master/Projects/STM32WB_Copro_Wireless_Binaries

1.1. CubeWB v1.14.0 - Bluetooth^® LE Wireless stack Summary

For Bluetooth^® LE applications, 6 binaries are available and certified BLE 5.3. According to the type of application, the size of the flash, it is up to the developer to load the right binary:

• stm32wb5x_BLE_Stack_full_extended_fw.bin - 177KB - Link Layer, HCI, L2CAP, ATT, SM, GAP and GATT database
  • To be used for Adverting/Scanning Extension - Full HCI/ACI/DTM commands/Event support
• stm32wb5x_BLE_Stack_full_fw.bin - 143KB - Link Layer, HCI(limited), L2CAP, ATT, SM, GAP and GATT database
  • To be used for GAP Central/Peripheral & GATT Server/Client applications
  • support up to 8 connections with maximum 2 links as Slave
• stm32wb5x_BLE_Stack_light_fw.bin - 112KB - Link Layer, HCI(limited), L2CAP, ATT, SM, GAP(limited) and GATT(limited) database
  • To be used for GAP Peripheral & GATT Server applications
  • support up to 2 links as Slave

BLE Stack 5.3 Certified	GAP Peripheral	GAP Central	GATT Server	GATT Client	PHY 2M	Data Length Extension	Legacy Pairing, LE secure connection	Privacy	White List	HCI Interface	DTM	L2CAP Connection Oriented channels support	Channel Selection #2	Extended Advertising Scanning	BT SIG Declaration ID
Full Extended	●	●	●	●	●	●	●	●	●	●	●	●	●	●	id123456
Full	●	●	●	●	●	●	●	●	●	reduced					id123456
Light	●'		●		??	●	●	●	●	reduced					id123456

• stm32wb5x_BLE_HCILayer_fw.bin - 93KB - Link Layer, HCI, DTM
  • To be used for BLE Host Stack running on CM4 application processor (Arduino, Zephyr,..)
• stm32wb5x_BLE_HCILayer_extended_fw.bin - 93KB - Link Layer, HCI, DTM, Extended Advertising/Scanning
  • To be used for BLE Host Stack running on CM4 application processor (Arduino, Zephyr,..)
• stm32wb5x_BLE_HCI_AdvScan_fw.bin - 34KB - Link Layer, HCI reduced
  • To be used for advertising and scanning through HCI interface

1.2. Stack Extended Information

To use extended binaries, it is necessary to adapt the scatter file in the BLE applications as:

• The RAM_A shared range shall be reduced to memory range [0x20030000:0x200307FF]
• The Mail-box buffers(MB_MEM1, MB_MEM2) shall be located in RAM_B shared defined in memory range [0x20038000:0x2003A7FF]
• The RAM_B shared shall be added to Total_RAM_region

define symbol __ICFEDIT_region_RAM_SHARED_start__ = 0x20030000;
define symbol __ICFEDIT_region_RAM_SHARED_end__   = 0x200307FF;

define symbol __ICFEDIT_region_RAM_B_SHARED_start__ = 0x20038000;
define symbol __ICFEDIT_region_RAM_B_SHARED_end__   = 0x2003A7FF;
define region RAM_B_SHARED_region = mem:[from __ICFEDIT_region_RAM_B_SHARED_start__   to __ICFEDIT_region_RAM_B_SHARED_end__];

define region Total_RAM_region  = RAM_region | RAM_SHARED_region | RAM_B_SHARED_region;