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Hello ST Team,I am designing a board using the STM32N657L0H3Q and would like to confirm whether its VBAT pin can operate at 1.8 V when directly connected to VDD.The proposed configuration is:VDD = 1.8 V. VDDA18AON = 1.8 V, supplied from the same always-on rail. VBAT connected directly to VDD through a 0 Ω resistor. No separate backup battery connected to the STM32. An external RTC with a CR2032 battery maintains the time when the main power is removed. Retention of the STM32’s internal backup domain is not required after power removal.In DS14791 Rev 11, Table 25, page 141, the VBAT operating range is specified as 3.0–3.6 V. However, footnote 2 on page 142 states:“When VDD is connected to VBAT, VBAT_min = VDD_min.”Could you please clarify:Is VBAT = VDD = 1.8 V a supported configuration for normal operation and Sleep/Stop/Standby modes? Does this footnote mean that the 3.0 V minimum applies only when VBAT is supplied independently? Are there any additional power-sequencing or configurati

Is there a recommended heat sink for EVLSTGAP3SXS-H? I would like to continuously run the device at 10 A but there are no heatsinks or clear thermal paths on the board. 

 Salve,dal STM32CubeMX2, durante la creazione di un nuovo progetto tramite Board Selector, non riesco a trovare la scheda NUCLEO-F401RE nell’ elenco disponibile.Ho già installato i pacchetti della famiglia STM32CubeF4 nelle versioni:stm32cubef4-v1-28-0stm32cubef4-v1-28-3 Mi potete dare una mano per gestire la scheda NUCLEO-F401RE nell' ambiente STM32CubeMX2?Grazie per l' aiuto.

 We are observing an intermittent issue on a subset of our devices where the accelerometer(LIS2HH12) outputs become stuck at approximately the following values:X: around -2 g Y: around +2 g Z: around +2 gWhen this condition occurs, the reported acceleration values remain fixed and do not respond to changes in device orientation or movement. 

  @lbthomsen of STM32World has published a review of the new STM32CubeMX2, what is good (not so much), indifferent and BAD (a lot). He tries to get it working, browse through the features, and has a lot of opinion on this matter.  https://www.youtube.com/watch?v=61r83TTzDfk End of the day, IF you plan to use future STM32 families (starting with STM32C5) you have no choice than to use CubeMX2 AND the very painful migration from HAL to HAL2 (not compatible, maybe some future tool can assist in such migration). Even if migration is possible, then you will have the pleasure to support multiple versions of YOUR code on old vs new MCU families. Have FUN. For the people without perfect vision (like myself), embrace yourself for 4 pixels font sizes, and contrast-free dark-white-on-white-backgrounds text. Lovely! At least there is plenty of white space around the text that can sooth your soul. Now is the best time for experienced STM32 shops to leave HAL, CubeMX and go Bare

 This post was edited by an ST moderator to comply with the ST Community’s code-sharing rules. STM32H743BIT6 Custom Ethernet Bootloader – Firmware Update and CRC Verification Successful, but Application Does Not Start (TouchGFX Display Remains Blank)Hello STM32 Community,I am developing a custom Ethernet bootloader for the STM32H743BIT6 microcontroller. The bootloader successfully receives firmware over Ethernet, programs the internal Flash and external QSPI Flash, and verifies the received firmware using CRC32.However, after completing the firmware update and attempting to launch the application, the TouchGFX display remains blank. The application does not appear to start correctly.I would appreciate your guidance on the application launch procedure, memory configuration, and recommended firmware update architecture for a custom STM32H7 bootloader.1. Hardware Configuration Microcontroller: STM32H743BIT6 Ethernet PHY: LAN8742A-CZ-TR Ethernet Interface: RMII External QSPI Flash: W

我现在使用STM32G0B1RBT6的62 63管脚，需要使用他们I2C通讯功能。现在断开这两个端口一切外设，只留下2.2K上拉电阻。为啥示波器上面一直都没有信号，一直都是保持3.3V上拉。但是把这2个端口配置成普通的GPIO又能够电平翻转。配置成I2C1 发数据，引脚上 测不到时钟信号。Translation:I am currently using pins 62 and 63 on the STM32G0B1RBT6 for I2C communication. I have disconnected all external peripherals from these pins, leaving only 2.2kΩ pull-up resistors in place. However, the oscilloscope shows no signal—the line remains held at the 3.3V pull-up level. Interestingly, if I reconfigure these pins as standard GPIOs, I am able to toggle their logic levels.When I configure them for I2C1 and attempt to transmit data, no clock signal can be detected on the pin.

Hello ST Community,I am currently developing a custom PCB based on the STM32H7A3ZIT6Q (LQFP144) microcontroller. I am facing an issue where the MCU can be successfully programmed using ST-LINK, but its GPIO pins do not appear to operate as expected.I would appreciate some guidance in identifying whether this could be related to the power supply configuration, internal regulator settings, clock configuration, or GPIO initialization.1. Hardware Configuration MCU: STM32H7A3ZIT6Q Package: LQFP144 PCB: Custom-designed 2-layer PCB Programming interface: ST-LINK/V2 Target voltage: 3.3V Power configuration: Internal LDO mode External crystal: 24 MHz The MCU is powered from an external 3.3V regulated supply.2. Programming StatusI can successfully connect to the MCU using STM32CubeIDE and STM32CubeProgrammer.The ST-LINK log reports: ST-LINK Firmware: V2J49S7 Target Voltage: 3.30V Device ID: 0x480 Device Name: STM32H7A/B Flash Size: 2 MB SWD Frequency: 4000 KHz The firmware

Hello ST team, I registered a myST account on 3 November 2026 and completed the profile (company, country China, address, phone). After logging in to https://ols.st.com/s/ the Contact Support page says "Looks like you don't have access to create a case. Ask your community manager for access.", and https://ols.st.com/s/newcase shows only the file-upload box and the Submit button, without the Subject / Description / Product / Category fields. The eStore form (newcase?o=es) displays normally. Same result in two different browsers. I have also e-mailed ols_support_center_coppell@st.com. We need to open a case about STM32F427VIT6 parts (marking / authenticity check). Could the community manager please escalate this to the ST Online Support Team, or open the case on our behalf? Thank you.

Hello,  I just created an account in order to be able to download tools needed to program an STM32F072-disco demo board. After login and clicking on the download link following error message appears:ForbiddenYou don't have permission to access this resource.Please assist in getting access to these tools. Best regards,Wim

Hello everyone,I'm trying to develop an application with LwIP without an operating system using the STM32C5A3x.When I set the LwIP operating system to “No OS,” I see some files in the CMake project that call FreeRTOSConfig.h, and the compilation fails.  Is anyone else experiencing the same problem? I’d also like to ask if there’s any information about the release of a new version of STM32CubeMX2.Thanks for help.

Hi,I’ve written a long question with a lot of detail about an observed behavior on using the builtin bootloader. It wasn’t accepted because it missed a tag. I clicked on the right side tags thinking this selects a tag. It does not. It shows all content for that tag. and not only that, it also completely erases my post, the back-button does not work. This is really bad behavior from this forum software, please fix it.And now you’re getting the faster, not-so elaborate question:I see the following communication when updating a firmware using the cube programmer (left programmer, right MCU answer): EE..........080000000800FF..44BB  ..79..797900..............79....000500000001000200030004000504..  ................................................................  ................................................................  ................................................................  ..........7979797979797979797979................................  797979797979797979797979797979793

Hi,We are using STM32L496. We are trying with Dynamic voltage scaling is being used and set to Range 2 and Low-power run mode. MCU is connected with 1.2V at VDD12 with external SMPS. How do we know, MCU is taking power from VDD12 SMPS or main VDD rail?VDD = 2.5V/Anurag  

Im trying to create a CAN communication bus between STM32G491RET6 and STM32H750DBK. In my code, the G4 acts as transmitter and H7 acts as reciever. While we are supposed to get BMS related values from G4 to H7 we are right now only keeping it to just a singular queue being sent from g4 to h7. However the H7 does not recieve any value at all from g4. While there are questions im aware regarding the same issue, they are really not helping with our problem.this and that informed us with clock config but i still have the same error. it shows an ACK issue when we use any ai model Basically,H7 does not recieve any value and all the live expression variables are at 0. There is a lot of queue error in Tx.Please help, the image of error attacthed, along with the zip file for codes.CAN_FD is H7 and G4TRANSMIT is G4  

PROBLEM:When loading a program, with size filling an odd number of memory sectors, into flash memory the program only starts every other upload. I have a custom board with an STM32L4KBU. I am connecting to the stm32 with the STLINK-V3SET, over SWO. I am developing with the VSCode STM32CubeIDE extension pack, on linux mint.STM32CubeProgrammer version: 2.23.0Boot0 pin is pulled to GND through 10k, default boot option bytes When using the STM32_Programmer_CLI to upload code there is a bug where the FLASH_SR PEMPTY register is not cleared correctly. It appears that the flash loader resets the register by writing all 1s, but the PEMPTY bit is specifically write 1 to toggle. This actually seems to be an odd design choice as the rest of the bits are write 1 to clear, and the language in the RM0394 Reference Manual is quite inconsistent (section 3.7.5, bit 17). A correct reset is to set this register to itself.The FLASH_SR register seems to get this toggling for every sector written into flash

I downloaded the latest version of X-CUBE-CLASSB-H7_v4.0.1 and found that it is missing library .aThe older version 4.0.0 has this.

Device: STM32H563ZISTM32CubeIDE for Visual Studio Code 3.11.0STM32Cube Build Analyzer 1.5.0Toolchain: st-arm-clang 21.1.1+st.7ProblemWhen the project is compiled with -funwind-tables, the Build Analyzer shows:UNKNOWN [unknown type] - [ACTIVE]Project configuration issue.The Build Analyzer output log shows no error, only:[starm-readobj] Running command: cube starm-readobj --all --pretty-print --elf-output-style=JSON .../build/Debug/<project>.elf[starm-readobj] Project extraction succeeded.Without the flag, the analyzer works normally and shows the memory regions.The .map file is still generated normally. When I open it manually from VS Code with the Build Analyzer (right-click → Open Build Analysis), the memory regions are shown correctly. Only the automatic analysis of the ELF fails. How to reproduceCreate a new empty project with the Clang toolchain and build it. The Build Analyzer works. Add -funwind-tables to the C flags in CMakeLists.txt and rebuild. The Build Analyzer shows “

This post is in response to the following post which has been closed so I am unable to reply...  Update – root cause found: STM32CubeProgrammer flash loader / FLASH_SR.PEMPTYI have finally found the cause of this issue and a reproducible workaround.The problem is related to the PEMPTY bit (bit 17) in FLASH_SR.On a failed debug/programming attempt I measured:FLASH_SR = 0x00020000 (PEMPTY = 1)SYSCFG->MEMRMP = 0x1SCB->VTOR = 0x1FFFF000PC = 0x1FFFxxxxThe MCU had therefore booted into System Memory rather than the application.On the next, successful attempt:FLASH_SR = 0x00000000 (PEMPTY = 0)SYSCFG->MEMRMP = 0x0PC = 0x0800xxxxThe option bytes were identical in both cases:FLASH->OPTR = 0xFFFF98AAI could reproduce this indefinitely: one programming attempt failed, the next worked, then failed, then worked.As a test, on a failed attempt I manually executed:set *(int*)0x40022010 = *(int*)0x40022010This changed FLASH_SR from:0x00020000to:0x00000000After subsequently resetting the

Hello ST Community,I am designing an RF matching network for the STM32WLE5CCU6 (UFQFPN48) at 923 MHz, +22 dBm.In AN5457, I found PA output impedance data for 915 MHz (+22 dBm, UFQFPN48), but not for 923 MHz.I would like to ask: What is the recommended optimal PA load impedance at 923 MHz, +22 dBm for UFQFPN48? Can I use the 915 MHz impedance values for designing the 923 MHz matching network? Does ST provide reference matching component values for this configuration? Thank you for your support!

Hello ST Community,I am troubleshooting a local debugging issue with the STM32N6570-DK (MB1939C) using STM32CubeIDE 2.2.0 on Windows 11.Environment Board: STM32N6570-DK / MB1939C IDE: STM32CubeIDE 2.2.0 ST-LINK GDB Server: v7.14.0 Debug interface: SWD Debug access port: AP1 – Cortex-M55 Connection: ST-LINK USB directly connected to the PC ProblemWhen I start a normal local ST-LINK GDB Server debug session from CubeIDE, I encounter the popup:“ST-LINK firmware verification – No ST-LINK detected!”However, STM32CubeProgrammer can connect to the board and successfully read, erase, and program the target.Tests already completed STM32CubeProgrammer detects the ST-LINK and communicates with the target successfully. Manually launching the same ST-LINK_gdbserver.exe command used by CubeIDE works and reaches “Waiting for debugger connection…”. Connecting CubeIDE using a remote GDB server configuration (127.0.0.1:61234) works. The GDB server listens on TCP port 61234, and arm-none-

Hi there, I tried to build NetXDuo stack with IPV6 and SLAAC version on H563ZI Nucleo boardHowever compilation of system libraries failed due to not linked symbols, it happened in all 3 ways of generations form CubeMX (copy all files, copy only required files, reference libraries).I.e. linker complained about lack of symbol _nx_nd_cache_add_entry and I noted filed is nx_nd_cache_add_entry.c is not compiled nor copied to project sources.

Hello,I believe I have identified a bug in STM32CubeMX 6.18 on STM32H563ZIT6.## Context- MCU: STM32H563ZIT6- Tool: STM32CubeMX 6.18- Firmware package: STM32CubeH5 1.7.0- Configuration: basic project, with no specific configuration other than:  - TrustZone enabled  - FreeRTOS enabled  - CMSIS-RTOS2 enabled in both Secure and Non-Secure contextsMy goal is simply to run FreeRTOS with one task for now, and then set up proper memory management and access control, which requires using CMSIS-RTOS2 in the Non-Secure project.## Observed behaviorWhen the project is created for the first time, everything works correctly:- the project is generated successfully;- the CMSIS-RTOS2 configuration on the Non-Secure side is accessible in the interface;- the FreeRTOS / CMSIS-RTOS2 settings are correctly present in the `.ioc` file.However, after saving and reopening the project in STM32CubeMX:- the CMSIS checkbox on the Non-Secure side is still visible;- but the CMSIS-RTOS2 Non-Secure configuration menu is

The CubeMX doesn’t list USART6 peripheral for the STM32H523CEU6, although it should have been supported according to the datasheet and reference manual. It even says ‘4 USARTs’ in the device description in the CubeMX.

Hello, I am designing a circuit using the STM32WL3R with a single shared antenna for two transmit frequencies. My requirements are:- 315 MHz: TX output, low RF power (approximately -40 dBm)- 433 MHz: TX_HP output, high RF power (approximately +12 dBm)- One shared antenna- Separate matching networks for 315 MHz and 430 MHz I would like to avoid an external RF switch if possible. 1. Can both matching networks be permanently connected to the shared antenna feed point, while enabling only one PA path at a time?2. When TX is transmitting at 315 MHz, what is the RF impedance of the disabled TX_HP output? Can the TX_HP output and its matching network affect the 315 MHz matching? I would appreciate any recommendations regarding the RF topology and matching network design. Thanks.