Difference between revisions of "ST STM32WB"

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(Available Stacks from ST)
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=== Available Stacks from ST ===
 
=== Available Stacks from ST ===
[[File:STM32WB55 WS Binaries.PNG | thumb | left | 600px | WS Binaries]]
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[[File:STM32WB55 WS Binaries.PNG | thumb | left | STM32WB5x wireless binaries]]
 
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Revision as of 13:58, 23 December 2021

The ST STM32WB55 devices are heterogeneous dual-core MCUs with a Cortex-M4 for the end-user application and a Corte-M0 for the BLE stack.

RSS / FUS

Root Security Service (RSS) and the Firmware Upgrade Service (FUS) are responsible for secure wireless stack updates and encryption key management. This firmware is executed by the secure core (Cortex-M0) and is not accessible by the end user or a debug probe. This firmware is factory installed in the STM32WB55 flash memory and is marked as secured. Therefore the end-user needs to take into consideration when choosing this device, as part of the memory will be already reserved for the RSS (around 5%). The RSS uses between 10 sectors (v0.5.3) and 12 sectors (v1.1.0) and is written in the flash memory end sectors. For example, for a 1MB device, this will be stored starting at the address 0x080F4000 for v1.1.0 and 0x080F6000 for v0.5.3.

How to update the Wireless Stack

Uploading a wireless stack to the STM32WB55 can be done with- J-Link Commander(J-Link.exe). This section describes how this is done via the following steps:

  1. Acquire Wireless Stack binaries and determine the correct flash address.
  2. Start the device in boot loader mode.
  3. Connect to the MCU using J-Link Commander.
  4. Load wireless stack to target using J-Link Commander.

Acquire Wireless Stack binaries

The wireless stack binaries can be downloaded from https://www.st.com/en/embedded-software/stm32cubewb.html.
After downloading:

  • Unpack the package
  • Navigate to STM32Cube_FW_WB_V<Version>\Projects\STM32WB_Copro_Wireless_Binaries\.
  • Open Release_Notes.html, which contains information about:
    • Where each stack starts.
    • The corresponding binary files and where they should be programmed to.

Bellow in Available Stacks from ST you may find the current available stacks and assigned addresses.

Start Device in system boot loader mode

It is important that the device starts in system boot mode. The update procedure relies on the system boot loader to be executed, as the system bootloader sets up the shared tables, which are required for the Wireless Stack and FUS upgrade.

This can be done with the following configurations:

nBOOT1
FLASH_OPTR[23]
nBOOT0
FLASH_OPTR[27]
BOOT0
pin PH3
nSWBOOT0
FLASH_OPTR[26]
Main Flash
empty
--- --- NO.png YES.png YES.png
YES.png --- YES.png YES.png ---
YES.png NO.png --- NO.png ---

YES.png == Set
NO.png == Not set
--- == Don't care

Note:
For information on how to program the option bytes, please refer to this example

Connect to the Device with J-Link Commander

Before connecting to the Device, please make sure you are using the latest version of the J-Link Software Pack. Open the J-Link commander (%JLinkInstallDir%\JLink.exe) using the following command line:

Windows: 
  JLink.exe -autoconnect 1 -device "STM32WB55xx - FUS" -if swd -speed 4000
Linux/MacOS:
  JLinkExe  -autoconnect 1 -device "STM32WB55xx - FUS" -if swd -speed 4000

The above command output should be as following:
STM32WB55 Connect.PNG

Downloading the wireless stack

After connecting to the MCU successfully, download the Update using the Reset and LoadFile commands. Even though resetting the device is not mandatory, it is highly recommended.

r
loadfile <PathToBinary>\stm32wb5x_BLE_Stack_fw.bin, <Address>
Note:
The address the wireless stack has to be downloaded to differs depending on update version and device.

Example (STM32WB5xxG, version 1.1.0):

J-Link> loadfile "C:\Users\Fabian\Desktop\STM32Cube_FW_WB_V1.13.0\Projects\STM32WB_Copro_Wireless_Binaries\STM32WB5x\stm32wb5x_BLE_Stack_full_fw.bin" 0x080C7000

The output should look like the following:
STM32WB55 WS upgrade.PNG

How to delete the Wireless Stack

  1. Start the device in system boot loader mode as described here.
  2. Connect to the device as described here.
  3. (Optional/Recommended) Reset the device using the Reset command.
  4. Erase the the device using the Erase command.
Reset
Erase 0xFFFFFFFF, 0xFFFFFFFF // Selecting this range will prevent anything but the wireless stack to be erased.
Note:

Not providing an erase range also works. However, J-Link will report a erase error, and a part of the flash will be deleted.

To prevent this, the above address range is provided.

STM32WB55 erase under J-Link commander

How to update the RSS

Same process as a wireless Stack. Simply loadbin over J-Link Commander to the memory specified by ST and wait for the process to finish.
Warning:
Once the FUS is updated from the v0.5.3 to v1.0.1 is not possible to reverse RSS or install WS from previous versions. The RSS/FUS can only upload wireless stacks within the same release version.

How does it work

The process for uploading a Wireless stack to STM32WB55 with J-Link works by uploading the binary to the flash memory and then by requesting a Wireless stack upgrade to the FUS(Firmware Upgrade Service), by means of communication with IPPC and shared tables.

The upgrade process

  1. Before the upgrade is started the J-Link will request the FUS/RSS to delete any current wireless stack that might be installed.
  2. The uploaded stack to the flash will be checked by J-Link if it contains a valid image signature.
  3. A WS_UPGRADE request is made to the FUS. During this process, the MCU will reset several times. Until the Cortex-M0 becomes responsive the J-Link will try every second to establish a connection with the FSU.
Note:
This process takes around 20 to 30 seconds depending on the Wireless stack size.

Available Stacks from ST

STM32WB5x wireless binaries


For the correct download address, please refer to:
STM32Cube_FW_WB_V<Version>\Projects\STM32WB_Copro_Wireless_Binaries\STM32WB5xRelease_Notes.html

FAQ

How does J-Link communicates with the FUS and performs the Wireless stack upgrade/delete requests?
The communication between the J-Link and the RSS/FUS is performed by use of the IPPC(Inter-Processor Communication Channel) and shared tables that are pre-defined by Cortex-M0.

Does this mean that the Cortex-M0 is always running the RSS firmware?
No, the RSS firmware is only running when a wireless stack is not installed or a request is made through the IPCC and shared tables.

Can I delete the RSS firmware?
No, it is marked as secure so it is not possible to delete it.

Can I make my own Wireless stack and upload it?
Currently, ST only allows uploading STs encrypted wireless stacks.

Programming the option bytes

How the option bytes are programmed is shown by the example below.

Example - Setting system boot mode

Connect to the device using the following command line:

"%JLinkInstDir%/JLink.exe" -device "STM32WB55CG" -if SWD -speed 4000 -autoconnect 1

Read the OPTR register, and check if the required boot options are already set.

Mem32  0x58004020, 1          // Read OPTR to determine boot option bits.

If not, you can modify them via the following sequence.

Reset
Write4 0x58004008, 0x45670123 // Unlock FLASH_CR
Write4 0x58004008, 0xCDEF89AB // Unlock FLASH_CR
Write4 0x5800400C, 0x08192A3B // Unlock FLASH_OPTR
Write4 0x5800400C, 0x4C5D6E7F // Unlock FLASH_OPTR
Write4 0x58004020, 0x33FFF1AA // Clear nBOOT0 & nSWBOOT0, keep nSWBOOT0 set.
Write4 0x58004014, 0x00020000 // Set OPTSTRT
Sleep 200                     // Give operation some time
Write4 0x58004014, 0x08000000 // Set OBL_LAUNCH
Note:
  • For this example FLASH_OPTR is assumed to have ST production value (0x3FFF_F1AA).
  • Setting OBL_LAUNCH will trigger a reset. This means, the debug connection will be lost afterwards.
  • The same method can be used to reset the option bytes after performing a stack upgrade.
  • When selecting "STM32WB55CG (ALLOW OPT. BYTES)", the option bytes can be written directly (address: 0x1FFF_8000), however the option bytes will not have loaded afterwards. It is either required to set OBL_LAUNCH (see above) or power-cycle the device.