STM32 MCUs Embedded software

When using USB CDC to communicate via USART, and interacting with USART data, in code is it recommended to interact with it at the USB side, or to interact with it at the USART side?From what I can tell, both offer both polling and interrupt methods. The USART offers DMA access, but apart from that it's not clear what, if any, tradeoffs there are between USB CDC and USART.

Hello,in our application, running on a H533RET6 and with no TZ enabled, we need to close debug ports in production.I preliminarly did some tests using CubeProgrammer: I generated password-based credentials (obk+bin files, which as far as I understand from AN6008 is the only option when not in TZ) and successfully managed to lock the device by moving from PRODUCT_STATE Open (0xED) to Provisioning (0x17), supplying the .obk file and then lock the device (PRODUCT_STATE = 0x72). After verifying that debug ports were closed, I unlocked the device by making a discovery and providing the bin file, with the device returning into Open state. Note that the first 3 32-bit words of my obk file are:0x00, 0x01, 0xfd, 0x0f, 0x60, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00Showing that the address base is the secure OBK base address and that  the encryption is on (as it should be in my device, again as far as I understand).So far so good, but know I would like to move at least the encryption process

I'm trying to enable USART transmission (TX only for now) via DMA, but when I call HAL_UART_Transmit_DMA, the transfer doesn't seem to start at all and HAL_UART_TxCpltCallback is never called.I've configured everything through CubeMX: enabled USART with DMA, enabled FreeRTOS, and enabled interrupts. Without DMA, transmission works fine using HAL_UART_Transmit, but when I switch to HAL_UART_Transmit_DMA, nothing happens.I can't figure out what the problem might be. Does anyone have any suggestions?Here's my main code:/* USER CODE BEGIN Header */ /** ****************************************************************************** * @file : main.c * @brief : Main program body ****************************************************************************** * @attention * * Copyright (c) 2026 STMicroelectronics. * All rights reserved. * * This software is licensed under terms that can be found in the LICENSE file * in the root directory of this software component. * If no LICENSE fi

Hello everyone, I'm having some trouble implementing I3C communication and would like to ask for some help.   I am using the NUCLEO-H503RB board as my main controller. For the target devices, I have the NUCLEO-IKS01A3 expansion board and the TSC1641 (Click Board) connected. I'm currently facing some issues with the I3C communication setup between these components.     I have successfully managed to read the WHO_AM_I ID from the LSM6DSO (on the NUCLEO-IKS01A3). However, when I attempt to read the ID from the TSC1641, the SCL line continues to output a clock signal (or stays toggling) without a proper response. I am seeking assistance in analyzing the root cause of this issue.    

I want to make a pedometer app that would count steps and display the number of steps on an LCD screen. I have tested my functions for the screen (ILI9341 SPI), and they work successfully. I tested the LCD code by initializing a timer that incremented the value to display every second and sets the flag update_lcd_flag.But when I add the pedometer code, which uses SPI1, the value on the screen never gets updated past zero. Is it because I launch a DMA interrupt from the timer interrupt, or do I need to look for problems somehwere else, e.g. in my pedometer logic or SPI1 configuration? The pedometer relies on the accelometer, which is built into STM32F4O7G-DISC1, which is my board, by defaultP.S. The LCD functions don't use interrupts or DMA, they only use polling.The timer callbackvoid HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef* htim) { if (htim->Instance == TIM2) { if (draw_ready == 1) { HAL_GPIO_WritePin(ACC_GPIO_PORT, ACC_GPIO_PIN, GPIO_PIN_RESET); HAL_SPI_T

I am migrating from STM32L431 to STM32L471. After migration, the function relating to internal flash writing does not work any more. The problem is when I programmed internal flash with HAL_FLASH_Program(FLASH_TYPEPROGRAM_DOUBLEWORD, address, data), following errors occurred, including FLASH_SR_PROGERR, FLASH_FLAG_PGAERR, and FLASH_FLAG_PGSERR.I searched on the web, and found problem may relate to timer initialization and watchdog usage. I added HAL_TIM_Base_DeInit before HAL_TIM_Base_Init, and watchdog is disabled completely in the system including wathdog initialization and update.. But the problem is still there.By the way, the development environment is MDK5.36, ARM::CMSIS IS 5.8.0 (5.6.0 is also tested), ARM::CMSIS-Driver is 2.6.1, Keil::STM32L4xx_DFP is 2.6.1.So, what the problem it might be, and how can I solve this problem?Thanks

 Hello,I am using an ST7701S LCD over 3-wire SPI (CS, SCK, SDA) with my STM32.When I send the initialization commands from my ESP, I noticed the following:The first command of the sequence is not sent.The program seems to stop at the second stage, around the 100th command.SPI is configured in master mode, polling (no DMA, no interrupts).Example of the write function:void ST7701_Write(uint8_t dc, uint8_t data) { uint16_t value = ((dc & 0x01) << 8) | data; HAL_GPIO_WritePin(LCD_CS_GPIO_Port, LCD_CS_Pin, GPIO_PIN_RESET); HAL_SPI_Transmit(&hspi2, (uint8_t *)&value, 1, HAL_MAX_DELAY); HAL_GPIO_WritePin(LCD_CS_GPIO_Port, LCD_CS_Pin, GPIO_PIN_SET); }Questions:Could the first command being skipped be due to HAL/SPI initialization or state?What is the recommended method to ensure all commands are reliably sent over 3-wire SPI to ST7701S?Thank you for your help.

Hello Everyone,I hope this message finds you well. I am currently developing a USB Host application using the STM32H573I-DK and have encountered a persistent Hard Fault issue that I would like to seek your expertise on.[Environment Information]Target: STM32H573I-DKExample: USBPD_SRC_UX_Host_MSC Stack: Azure RTOS (ThreadX, USBX)[Detailed Symptom]A hard fault occurs during initialization or while driving the process thread (msc_process_thread_entry) when connecting a USB MSC device. Debugging revealed abnormal memory access occurring during execution of the _ux_utility_memory_copy function.[Inquiry]When implementing USBX Host in this example and the STM32H5 environment, we seek broad advice on potential causes that could trigger memory copy and access errors.Example Stability: Are there any known issues or patch histories related to USBX memory management or stack configuration in the currently deployed USBPD_SRC_UX_Host_MSC example?H5 Architecture Characteristics: Are there scenari

I'm using stm32u535 and would like to have zero crossing detection of supply voltage. I've requirement of 6ADC channels and all are configured in differential mode and adc clock is 25Mhz and resolution is 14 bit and dma circular mode is enabled. On channel 6 i e enabled analog watchdog and written logic in isr to toggle GPIO. I proved gpio and I see deviation. Can someone help here. Here is my code snippet:ADC and AWDG initialization: hadc1.Instance = ADC1; hadc1.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV1; hadc1.Init.Resolution = ADC_RESOLUTION_14B; hadc1.Init.GainCompensation = 0; hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT; hadc1.Init.ScanConvMode = ADC_SCAN_ENABLE; hadc1.Init.EOCSelection = ADC_EOC_SEQ_CONV; hadc1.Init.LowPowerAutoWait = DISABLE; hadc1.Init.ContinuousConvMode = ENABLE; hadc1.Init.NbrOfConversion = 8; hadc1.Init.DiscontinuousConvMode = DISABLE; hadc1.Init.ExternalTrigConv = ADC_SOFTWARE_START; hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_N

Hi STM Devs!I would like to introduce a thread scheduling library - SuperTinyKernel (STK).Its GitHub repo: https://github.com/dmitrykos/stkYou can check capabilities in detail on GitHub but briefly STK can:Soft and hard real-time support: STK supports cooperative scheduling for “soft real-time” tasks, you can also enable hard real-time mode (KERNEL_HRT) for periodic tasks with guaranteed deadlines.Static and dynamic tasks: Define all tasks at startup (KERNEL_STATIC) or allow tasks to be created and destroyed at runtime (KERNEL_DYNAMIC).Low-power friendliness: STK puts MCU into a low-power mode when there are no runnable tasks (task calls Sleep).Tiny footprint: Minimal C++ abstractions (no STL, no heavy namespaces) keep the kernel small and simple.Portability: Supports ARM Cortex-M and RISC-V RV32 MCUs.Multi-core support: Fully implemented for Cortex-M and RISC-V.x86 development mode: Compile & debug your code on a PC before flashing to the MCU, which helps with early

NUCLEO-F411REI have ADC1 to DMA in a circular buffer 4 samples long (ADC_VAL). I then use a TIM1 interrupt to send the contents via UART to a PC. int16_t ADC_VAL[4]; ... HAL_ADC_STart_DMA(&hadc1, (uint32_t *)ADC_VAL, 4); /* TIM1 callback */ void HAL_TIM_periodElapsedCallback(TIM_HandleTypeDef *htim) { HAL_UART_Transmit(&huart2, (uint8_t *)ADC_VAL, 16, 10); }   Should I have declared ADC_VAL as a uint32_t ?  

I am using STM32H753ZI and trying to bring up Ethernet (LAN8742, RMII) using HAL + lwIP in NO-RTOS  mode. I generated the code using STM32CubeMX with ETH enabled (RMII) and lwIP enabled (WITH_RTOS disabled, static IP). The PHY link comes up and RJ45 LEDs blink, but the board does not respond to ping and no ARP entry is created on the PC (Destination Host Unreachable). I have placed ETH descriptors and RX buffers in D2 SRAM, enabled MPU and D-Cache, verified RMII_REF_CLK to PA1, selected the LAN8742 PHY driver, and I am calling MX_ETH_Init(), MX_LWIP_Init(), and processing lwIP in the main loop. The FreeRTOS-based STM32H743 Ethernet example works, but I specifically want a HAL-only .

HelloI am currently developing a quadruped robot using a NUCLEO-H753ZI. My setup involves a mix of Dynamixel AX-12+ (UART3, 1Mbps, Protocol 1.0) and MX-series motors (UART6, 2Mbps, Protocol 2.0) using an SN74LS241N transceiver.The Problem:UART3 (AX-12): Works perfectly at 1Mbps. This confirms my basic transceiver logic and wiring are functional.UART6 (MX-Series): No response at all. I’ve tried downgrading the MX motors to 1Mbps and using Protocol 1.0 to match the AX-12, but still nothing.Technical Context & MPU Setup: To provide more context, I have implemented an MPU configuration primarily to handle IMU sensor data via DMA. I wanted to ensure cache coherency for the IMU data buffers.However, I am now concerned that this MPU/Cache setup might be interfering with my UART6 communication. Since the MX motors on UART6 require much higher timing precision (especially at 2Mbps), I suspect the D-Cache or MPU regions might be causing issues with the UART TX buffers, even though I'm curren

Hi I have been testing secure function calls from non-secure world in STM32U575 - TrustZone Enabled environment.I have a LED_Port which is in secure world (secure peripheral). I have implemented a toggle function in secure project - secure_nsc.c/hCMSE_NS_ENTRY void SECURE_BlinkBlueLED(void) {...}I can be able to compile without any issues:Here are some linker details:.....................................I verified the map files as below.......................Now I am calling this function from non-secure project: It went to Hard Fault as it calls original function which is in the secure world.How to call veneer instead of direct function?Any help?   

I have been trying to add freeRTOS to simple LED - TrustZone enabled project (default LED project). I just followed the instructions as given here: How to use STM32U5 with FreeRTOS™ in tickless mode - STMicroelectronics Community This instruction shows enabling X_CUBE-FREERTOS for NS but this gave me the following errors:  So, I enabled for both, secure and non-secure versions in Cube MX This solved my previous errors but code hang in HAL_GTZC_MPCBB_ConfigMem() [Note: before enabling RTOS I did not see any issues in calling this function]   Any suggestions?

Zephyr RTOS 4.3.I am trying to get this sample working on my STM32 Nucleo F767ZI board:zephyr/samples/drivers/uart/async_api/I created an overlay file.nucleo_f767zi.overlay dut: &usart3 { dmas = <&dma1 2 STM32_DMA_PERIPH_TX>, <&dma1 3 STM32_DMA_PERIPH_RX>; dma-names = "tx", "rx"; }; &dma1 { status = "okay"; }; Building and running the sample I get the following output: *** Booting Zephyr OS build v4.3.0-929-g1d6e0d533a81 *** [00:00:05.000,000] <inf> sample: Loop 0: Sending 3 packets [00:00:05.000,000] <err> uart_stm32: Tx buffer should be placed in a nocache memory region [00:00:05.000,000] <err> sample: Unknown error (-14) [00:00:05.000,000] <err> uart_stm32: Tx buffer should be placed in a nocache memory region [00:00:05.000,000] <err> sample: Unknown error (-14) [00:00:05.000,000] <err> uart_stm32: Tx buffer should be placed in a nocache memory region [00:00:05.000,000] <err> sample: Unknown error

Hello! I have a struggle to boot the isolation LRUN project from STM32Cube_FW_N6_V1.3.0/Projects/STM32N6570-DK/Templates/Template_Isolation_LRUN. 1. First i've performed the mass erase to remove the demo on the discovery board. 2. I've build and add the header to the binary with the Signing Tool for all three projects. Example below for FSBL. STM32_SigningTool_CLI -bin Template_Isolation_LRUN_FSBL.bin -nk -of 0x80000000 -t fsbl -o Template_Isolation_LRUN_FSBL-trusted.bin -hv 2.3 -dump Template_Isolation_LRUN_FSBL-trusted.bin3. I've Flashed the external memory in DEV mode with all three images:FSBL flashed to 0x7000 0000 SecApp flashed to 0x7010 0000NonSecApp flashed to 0x7018 00004. I've switched the board to Boot from ext. memory mode and pressed restart. The board doesn't boot. 5. I've loaded the FSBL project in DEV mode with debugger to internal RAM( 0x3418 0400 ) and it runs nicely. ---------------------------------------------

I am using a STM32G4 MCU and STM32CubeIDE. I want to synchronise two timers (TIM3 and TIM15) that are generating PWM signals so that they both start at the same time. TIM3 is set to 250 kHz and the PWM is modulated via DMA on channel 1.  The modulated signal is a 10 kHz sine wave.TIM15 is set to 10 kHz and the PWM is a simple 50% duty cycle.I need the timers to start together to ensure that the PW Modulated 10 kHz sine wave (TIM3) is synchronised to the 10 kHz PWM (TIM15).I thought it would be straight forward enough. I have configured TIM15 as master.  In CubeMX I have set Master/Slave Mode (MSM bit) to "Enable (Trigger delayed for master/slaves simultaneous start)" and Trigger Event Selection to "Enable (CNT_EN)".I have configured TIM3 as a slave.  In CubeMX I have set Slave Mode to "Trigger Mode" and Trigger Source to "ITR6" (per the reference manual).To the CubeIDE generated code I have added: /* USER CODE BEGIN 2 */ HAL_TIM_PWM_Start_DMA(&htim3,

Hello everyone,I'm writing this to provide support for my External Loader project for TouchGFX , which I've been working on for a long time.The External Loader file works good with STM32CubeProgrammer. (Write-Erase-Read operations are possible)  LOG OUTPUT IS ATTACHED --> [STM32Cube Programmer LOG Output]When I run my project file LCD_Driver_v10 and my External Loader file together, I get the following errors: The complete error message is attached. --> [STM32Cube IDE CONSOLE Output] Error: failed to download Sector[0]Error: failed to download the FileEncountered Error when opening C:\Users\USER\STM32CubeIDE\plugins\com.st.stm32cube.ide.mcu.externaltools.cubeprogrammer.win32_2.2.300.202508131133\tools\bin\STM32_Programmer_CLI.exeError in STM32CubeProgrammer I also checked this address https://community.st.com/t5/stm32-mcus-touchgfx-and-gui/external-loader-fails-to-download/m-p/136566#M6974 which has a similar problem, but nothing changed.My Mcu is STM32F7

Hello everyone, First of all I am kinda new in ARM (I never use), I am working on the STM32H745I-DISCO board (using the CM7 core) and I am facing a persistent issue with UART . No matter what I try, the RX Interrupt never triggers, and the code never enters the HAL_UART_RxCpltCallback. My Setup: Board: STM32H745I-DISCO IDE: STM32CubeIDE (Latest Version) Scenario: UART Loopback Test (Connecting TX to RX physically). Peripheral: USART6 (TX: PC6 / RX: PC7) on the Arduino Headers (D1/D0). Settings: 115200 baud, 8N1, Asynchronous. The Problem: -HAL_UART_Transmit works fine (signals observed). HAL_UART_Receive_IT returns HAL_OK. However, the HAL_UART_RxCpltCallback is never executed.  When checking SFRs in Debug mode: RXNE flag stays at 0. What I have verified so far (Step-by-Step): NVIC Settings: USART6 global interrupt is Enabled in CubeMX. Vector Table: USART6_IRQHandler exists in stm32h7xx_it.c and calls HAL_UART_IRQHandler. Initialization Order: I ensured that MX_USART6_

I'll explain Flash Erase Error to the stm32l475rct6 MCU that I'm currently using. Page : 127, Address : 0x0803F800, Bank : FLASH_BANK_1 is defined, and if you try to modify the value after first saving the value in the Flash area, the values already stored in Flash are not erased properly, so the Flash value cannot be modified. SMT32CubeIDE version is 1.19.0 and I'll attach the code I implement, so please check where the problem is and let me know if there is a solution.void AO_SaveCalibration(void){HAL_StatusTypeDef status; printf("Saving calibration to Flash...\r\n");printf("Data size: %u bytes\r\n", sizeof(AO_Calibration_t)); ao_cal.checksum = Calculate_Checksum1(); status = HAL_FLASH_Unlock(); if (status != HAL_OK){printf("ERROR: Flash unlock failed\r\n");return;} __HAL_FLASH_CLEAR_FLAG(FLASH_FLAG_ALL_ERRORS); while(__HAL_FLASH_GET_FLAG(FLASH_FLAG_BSY)){// Flash 작업 완료 대기} FLASH_EraseInitTypeDef EraseInitStruct;uint32_t PageError = 0;EraseInitStruc

 Hello ST Community,I am working with the STM32N6570-DK and the USBX Ux_Device_Video example fromSTM32Cube_FW_N6_V1.3.0\Projects\STM32N6570-DK\Applications\USBX\Ux_Device_Video.I followed the README instructions exactly:Built FSBL and Ux_Device_Video projects successfully in STM32CubeIDEGenerated FSBL.bin and Ux_Device_Video.binSigned both binaries using STM32_SigningTool_CLIProgrammed:FSBL-trusted.bin at 0x70000000 (external flash)Ux_Device_Video-trusted.bin at 0x70100000 (external flash)Set BOOT0 and BOOT1 to boot from external flash and reset the boardHowever, the application does not run as expected. When the board is connected to a Windows PC, the Windows Camera application fails with the error:   Can't start your camera0xA00F4241 <CameraSwitchFailed> (0xC00DABE7)From my understanding, the Ux_Device_Video example should enumerate as a USB UVC camera and stream video to the Windows Camera app. Since the camera app fails, it seems the firmware may not be executi

I'm using the X-CUBE-EEPROM library on my STM32C031G6Ux to store keys in flash memory. I configured eeprom_emul_conf.h so that the emulated EEPROM starts at 0x08007000, with 2 pages of 2 KB each, and set NB_OF_VARIABLES to 240.When I tried saving 240 variables once using EE_WriteVariable32bits and reading them back with EE_ReadVariable8bits, everything worked fine.However, when I repeat this process three times, writing stops once both pages are full, and the data is no longer read correctly.I experienced similar issues even with 120 variables. Interestingly, adding EE_CleanUp after all writes solved the problem for 120 variables.I then tried the same approach with 240 variables, calling EE_CleanUp after all write operations, but it still didn’t work.Is there a reason for this behavior? Am I limited to storing only 120 variables in flash?

Hello fellow readers,##Disclaimer##I am using a Nucleo Board, the Nucleo H7S3L8, and HAL_ERROR ist laughing me since 2 days in my face# I think you, dear reader, have heard about the SWR-Bit, which vanishes out as soon the software has restarted succesfully, everything seems perfect and you have finally the feeling you found the solution to world piece.But I am currently at the brink of insanity, because this little ******* ***** ** **** wont clear itself after I forced the reset. What do I mean specifically?HAL_StatusTypeDef HAL_ETH_Init(ETH_HandleTypeDef *heth) { uint32_t tickstart; if (heth == NULL) { return HAL_ERROR; } if (heth->gState == HAL_ETH_STATE_RESET) { heth->gState = HAL_ETH_STATE_BUSY; #if (USE_HAL_ETH_REGISTER_CALLBACKS == 1) ETH_InitCallbacksToDefault(heth); if (heth->MspInitCallback == NULL) { heth->MspInitCallback = HAL_ETH_MspInit; } /* Init the low level hardware */ heth->MspInitCallback(heth); #else /* Init the low lev

Hi I am using Nucleo H753zi board, can I use X-CUBE-MEMSMIC1 expansion for sound source localization.