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I'm using a NUCLEO-L4A6ZG board with the STM32L4A6ZG MCU. My project uses the microSD connector for serial communication with a computerThe microSD connector uses lpuart1. I use uart_irq_callback_user_data_set to install a callback for received data. This works perfectly from a cold boot (power disconnected). The callback is invoked as data is received. From a warm boot (reset without disconnecting power), the receive callback is never invoked. In this state, even though the receive callback is never called, the STM32L4A6ZG can still transmit data over lpuart1.I changed the Device Tree to use uart3 instead (with an external serial-to-usb bridge). There are no code changes. That works perfectly every time – the receive callback is invoked after both cold and warm reboots.Any suggestions?

Post edited by ST moderator to be inline with the community rules especially with the code sharing. In next time please use </> button to paste your code. Please read this post: How to insert source code #define FMC_BANK1_BASE ((uint32_t)0x60000000) #define FMC_A16_OFFSET ((uint32_t)0x00020000) #define LCD_REG (*((volatile uint8_t *) FMC_BANK1_BASE)) #define LCD_RAM (*((volatile uint8_t *) (FMC_BANK1_BASE | FMC_A16_OFFSET))) 0x00020000 does not work 0x00010000 does not work when write data (LCD_RAM ) is has to be high maybe it is the other way around I am using STM32F427VGT6 the display is 8 BIT FMC, maybe it has something to do with declaration ((uint32_t)0x60000000) instead of  ((uint8_

Hi! I have a cirquitboard that contains a component of ST mark. It is a surficemounted component thatlooks like a diod with a stripe in one end. It is marked DX 63 450 utt i can not find this component onyour side. Can yoy help me?/ Bjoern

Hi I would like to use the same pcb antenna used in the STVAL-SMARTAG2 board in our product. Could you provide some more information on the pcb (thickness, material, impedance, etc) in order to keep the antenna performance?    BR Gilberto  

Hi everyone,I recently got a ZY-2.1BT 2.1 channel Bluetooth digital power amplifier board to test out as part of a DIY audio setup. The idea is to run two bookshelf speakers plus a subwoofer from a single board, mainly for a small home theater project.Setup Details:Power supply: 24V 10A DC adapterSpeakers: two 6Ω 50W bookshelf speakers + one 8Ω 80W subwooferInputs: tested both Bluetooth (5.1) and AUX from a laptopConnected using the provided DC power plug and screw terminals for speakersNow here are my issues:At medium to high volumes, I get distortion on the subwoofer even though the speakers sound cleanBluetooth pairing works fine at first, but sometimes audio

Hey,I have created a simple computer vision NN model and successfully deployed it on my STM32N6570-DK (original and quantized in the zip file).I want to "push" image files (to "emulate" the camera) from my computer to the board to run inference of the images on the board and get classification results and other information if possible.What is the quickest way to do that? Thanks in advance. 

Hello I want the STM32 to transmit data to the FPGA via the FMC. However, when I use the manufacturer's example and modify the return line in the FPGA, the LCD displays the modified value from the STM32 instead of the expected return line value. What configuration setting in the FMC_Test project am I overlooking that is preventing the correct value from appearing on the LCD?

Hi All,I had 2 questions in my current journey learning stm32 software as well as my stm32f746g board. I generated code based off an .ioc file created by the AI Edge Dev Cloud (a human activity keras model). My issues are as follows: 1. I debugged the code under OpenGDB and received this as my console output (see attachment below) however all my STM32 does is flash the led red and green rapidly. Does that mean it was successful? 2. I went back to the STM32CubeMX software to validate my model on target after debugging, however all i get met with is this output and the v

Goal: I need to store my newly added assets (images, fonts and texts generated from STM's touchGFX designer) in the existing project (which already has set of assets in it).BUG: The newly added assets (maybe text area, image, fonts) to the existing project, are not displaying properly. (My assumption is, the added assets might be stored inside the internal flash, because of it's large space, the data is overflowing, because of this the image is not properly displaying, instead it should store inside the external flash, I am facing issues with storing the external flash despite enabling the mapped storage format in the touchGFX designer).Help me to implement how I can move the contents of internal flash to external flash, so that the assets will be stored inside the external flash.

Hello,I am working on custom bootloader + application setup on a STM32G070CBT6Currently, I need to store bootloader flag that indicate whether the MCU should jump to the bootloader code or to the application code.Since the movement i am reserving 1 flash page(2KB) ,just to store single flag bit.This feels like a waste of memory, since I only need 1 bit of storage.My questions are:     1. Can I use Option Bytes memory area to store the custom flag? Are Option bytes  writable at runtime for application/bootloader use, or are they limited to ST system configurations (e.g., RDP, WRP, BOR levels)?      2. If Option Bytes memory area are not suitable ,is there another small memory area(apart from flash)          that is recommended for storing such a small boot flag?I need onl

STM32H7S3L8 – XIP app HardFault on vector fetch from XSPI (BFAR/MMFAR=0x70000004, VECTBL)MCU: STM32H7S3L8Tooling: STM32CubeIDE (HAL/CMSIS + FreeRTOS)External flash: NOR on XSPI2 (XSPIM Port 2). Bootloader sets XSPI to memory-mapped; application is linked for XIP at 0x7000_0000.What worksBootloader brings up XSPI, reads SFDP (initially had a DMA/IRQ config issue; fixed).Bootloader successfully puts the NOR in memory-mapped mode and jumps to the app:VTOR = 0x7000_0000MSP/PC loaded from 0x7000_0000 / 0x7000_0004Branch to Reset_Handler at 0x70005A44 is observed.The problemImmediately in the application I hit a HardFault. ST’s Fault Analyzer shows:HardFault: FORCEDConfig

Building upon my previous post, "Bidirectional Serial Communication with ST-Link using FreeRTOS on NUCLEO Boards," this code demonstrates a Simulator component and an Application component operating on two separate NUCLEO-C092RC boards. Please note that this project is intended for educational use and is not designed as robust production code; some errors or omissions may remain that users will need to address. This initial demonstration should function as described when configured according to the provided instructions, and it may serve as a foundational template for future development and enhancements. Val Gretchev

Hi,Will PC0 PC1 LPUART functions in normal operation? I have to use this LPUART in normal operation of MCU, not in power saving mode.Is there any limitation on this like speed, baud rate etc. Regards,Anurag    

 Hi everyone,I’m currently working on deploying a YOLOv8 model on the STM32MP25 using ST Edge AI. Here’s what I’ve done so far and where I’m stuck.Training & Export:from ultralytics import YOLO model = YOLO("yolov8n.pt") # medium variant  model.train( data=path, epochs=50, imgsz=256, project="Training", name="yolov8n_run", save=True ) # Export ONNX model.export( format="onnx", imgsz=256, opset=10, dynamic=

Hi everyone,I’m trying to generate two PWM signals with 50% duty cycle and a 90° phase shift, to simulate an A/B type output.I managed to achieve this using two different timers and adjusting the compare values, but I’d like to know if it’s possible to do it with a single timer, specifically TIM1.I noticed there are Asymmetric PWM1 and Asymmetric PWM2 modes, but I don’t really understand how they work and whether they can be used to get this kind of phase shift between two channels.Has anyone tried something similar or knows how to configure TIM1 to produce two PWM outputs in quadrature (90° out of phase) without relying on a second timer? Thanks!

I’m running into a strange issue when trying to jump into the STM32 bootloader.I’ve built an FDCAN bootloader flasher using an STM32H7 along with a Windows host program. This setup allows me to reprogram both virgin and already-programmed. To do this, I set the BOOT pin high and reset the MCU (controlled by another MCU via test pads). This method works flawlessly every time, and it’s just as fast as using an ST-Link V3.Now, I want to achieve the same result without using the BOOT pin (on already programmed MCU) —by sending a CAN message to trigger a jump into the STM32U5 internal bootloader. However, when I switch my programmer MCU to FDCAN mode and attempt communication, the bootloader does not respond....My hardware is designed so that, by default, the CAN transceiver and all required circuitry are active and ready. But once I perform the jump, the MCU simply won’t respond to FDCAN messages.Here’s what I’ve tried so far:

 Hello,I am testing a custom board based on STM32MP257FAK3 with two DDR4 MT40A1G16RC-062E_B devices, for a total of 4 GB (32-bit width).I have correctly set up the main configuration files to work with the PMIC and UART. I also exported the PCB layout of the Ax pins using CubeMX and re-imported them into the DDR configuration file. The .stm32 image is successfully generated and uploaded through CubeProgrammer. I can also access the console and successfully complete steps 0 and 1.However, when reaching step 2, the initialization fails.After some investigation, it seems that the failure occurs during training after the PHY configuration, specifically in the function: ddrphy_phyinit_usercustom_g_waitfwdone()At this point, the call to get_major_message() a

Hello,I have a ADC clock running at 96MHz prescaler divided by 10, 12bit, Sampling time 47.5 Cycles. I am just trying to sample this DC volgtages.  I have a battery that has around 20Volts, and I am stepping this voltage down using the voltage divider as U8, U1, U2 to be sampled by the ADC. I have two ADC measuring BN, and Vref to measure the current across the 1Ohm resistor. I am getting consistently accurate values, but I have this random 5mv difference or 30mV spikes that happens out of no where. I am not sure how to fix this to improve my ADC resolution. Could you please give me an idea how to proceed? I really appreciate the time and effort for this matter Thank you

Hi,We are using the STM32H725VGH6 MCU and are plannign to use the internal SMPS for VCORE.With regards to the connections required for the VLXSMPS pin, I would just like to confirm that a 220pF capacitor is required on this pin in the "Direct SMPS Supply" configuration. It seems unusual to have a capacitor directly on the output of a Buck SMPS. It is also not show in Figure 2 of "AN5419: Getting started with STM32H723/733, STM32H725/735 and STM32H730 Value Line hardware development". However it is recommended in Table 2 & Figure 3.

Dear ST Team,I am an embedded developer working with STM32 MCUs in various projects, and recently I have been exploring the use of Zephyr RTOS due to its growing adoption and strong ecosystem.I noticed that companies like Nordic Semiconductor provide a dedicated SDK (nRF Connect SDK) which deeply integrates Zephyr with their MCUs, making it easier for developers to use advanced RTOS features, drivers, and middleware.I would like to ask if ST has any plans to:1. Support the migration of more ST sensor drivers into Zephyr RTOS.2. Offer a dedicated SDK or integration layer (similar to Nordic’s nRF Connect SDK) that makes Zephyr development on STM32 more streamlined and accessible.Such an initiative would greatly benefit the developer community and strengthen STM32’s position in modern IoT and embedded software ecosystems.Best regards,

I tried to set readout protection via ST-LINK CLI - it's enabled and disabled correctly, but after RDP=0 I can't erase/write chip - I've got an error on write operation. Tested on 2 boards and both boards have same behavior. e:\STM32 projects>"%PROGRAMFILES%\STMicroelectronics\STM32 ST-LINK Utility\ST-LINK Utility\ST-LINK_CLI.exe" -c SWD SWCLK=9 -OB RDP=1 STM32 ST-LINK CLI v3.6.0.0 STM32 ST-LINK Command Line Interface [SWCLK=9]: SWCLK is obsolete. Use SWJCLK instead. ST-LINK SN: 55FF6B067087534936162567 ST-LINK Firmware version: V2J37S7 Connected via SWD. SWD Frequency = 950K. Target voltage = 3.1 V Connection mode: Normal Reset mode: Software reset Device ID: 0x466 Device flash Size: 64 Kbytes Device family: STM32G0 Updating option bytes... Option bytes updated successfully. e:\STM32 projects>"%PROGRAMFILES%\STMicroelectronics\STM32 ST-LINK Utility\ST-LINK Utility\ST-LINK_CLI.exe" -c SWD SWCLK=9 -OB RDP=0

Hi We are working on a project based on the STM32U073CCT6. The USB interfaces is not need. How should I connect the VDDUSB pin in order to minimize tthe power consuption? Is it Ok to connect it do GND? BrGilberto

DescriptionI am developing a system with STM32WB5MMG module.A pushbutton is connected to PA0 and is used to control the system power state:During runtime, PA0 works as an EXTI interrupt to request shutdown.In shutdown mode, PA0 should act as the wakeup source.System state before shutdownAt the moment the shutdown is requested, the system is fully initialized:Both cores (M4 and M0+) are running,The BLE stack is active and functional,Clocks, peripherals, and services are all started.Before calling the shutdown function, clocks and peripherals are stopped.So the transition into shutdown happens from a stable and fully operational state.IssueEntering shutdown works as expected: the current consumpt

Hi,I am using W25Q64JV NOR flash of size 8MB on ST STM32U5A9ZJ board. On the flash I have created a file system using LevelX and FileX. I have enabled fault tolerant option in FileX. I am writing 128bytes of data every 500ms to a file. Initially the write operation is taking around 70-80 ms, however after some time (after around 3000 writes) the write operation occasionally is taking around 3-4 seconds. This is after every few writes. Following is the fx_media_format parameters I have used                                status = fx_media_format( &flashMedia, fx_stm32_levelx_nor_driver, reinterpret_cast<VOID *>(LX_NOR_OSPI_DRIVER_ID), reinterpret_cast<UCHAR *>(mediaMemory), sizeof(mediaMemory), "FLASH_DISK", 1, // Number of FATs 32, // Directory Entries 0, // Hidden sectors (0x800000 - 0x10000)/ 0x10000, // Total sector

Hello everyone,I am using the STM32N6570-DK.BackgroundThe example STM32CubeN6/Projects/STM32N6570-DK/Applications/DCMIPP/DCMIPP_ContinuousMode at main · STMicroelectronics/STM32CubeN6 · GitHub is just a FSBL project. So the application is part of the FSBL and limited to 512 KB memory. I want to use this example for my project but I don't want to be limited to the 512 KB. Thats why I tried to migrate this example to an FSBL with load & run application.What have I done so far?At first I created a new project and tried to blink a LED in the main.c file of the _Appli project. This worked and I knew the project setup was correct. Then I set up everything what I need for the DCMIPP_ContinuousMode in the .ioc File an