STM32 MCUs Embedded software

There have been previous posts about determining how the DFU serial number is formed from the 96-bit Unique ID.  However, when using the ROM bootloader for the STM32F723xx MCU I don't see unique serial numbers at all.  I am always seeing the same DFU serial number in the iSerial string of the USB descriptor set to "STM32FxSTM32" no matter which device I query.  I haven't found any mention of a setting that I need to configure in order to enable unique serial numbers for DFU, but I was hoping that someone in the community might have a suggestion.  Or at least be able to confirm that it is expected behavior for the DFU serial number to always be "STM32FxSTM32" for all of my STM32F723xx MCUs.Thanks for the help!

Hi, this is my first post here and one of my first experiences with the STM32.I'm working on an STM32H7A3ZI-Q development board. I've connected an Adafruit PDM microphone to SAI1_A with clock on PE2 (SAI1_CK1) and data on PE6 (SAI1_D1). I'm not an expert on PDM microphones; I used to acquire analog data from an amplified microphone with an ADC and timer 2 (everything worked perfectly) and then transferred the data via UART to my PC, where I listened to it with a Python script.Now I need to switch to a PDM microphone.Now, I've configured this PDM MONO microphone to be used in PDM mode with CK1, with an 8-bit data size and a 16-bit frame, the same slot size as the data, 2 slots (the IOC forces me to use even numbers), free protocol, and asynchronous sync input.I get the peripheral clock from PLL2 and it's 40.96 MHz. I set the frequency divider after init (the HAL code generator doesn't generate the correct divider) to get a 1.024 MHz output to the microphone, and the oscilloscope shows t

  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 Hi, On checking, I noticed a mismatch between the expected sampling frequency (44.1 kHz) and the actual frequency (46.875 kHz). Could this be the cause of the noise? Any suggestions on what might be going wrong? For reference, I’m using SAI1_A with circular linked-list channel 12 of GPDMA1. The configuration details for SAI and GPDMA are provided below.  GPDMA Configuration:  handle_GPDMA1_Channel12.Instance = GPDMA1_Channel12; handle_GPDMA1_Channel12.InitLinkedList.Priority = DMA_HIGH_PRIORITY; handle_GPDMA1_Channel12.InitLinkedList.LinkStepMode = DMA_LSM_FULL_EXECUTION; handle_GPDMA1_Channel12.InitLinkedList.LinkAllocatedPort = DMA_LINK_ALLOCATED_PORT0; handle_GPDMA1_Channel12.InitLinkedList.TransferEventMode = DMA_TCEM_LAST_LL_ITEM_TRANSFER; han

Struggling with a really weird issue here. I'm working on a project using Zephyr on an STM32U5A5ZJT6Q. We are using an LSE-clocked LPTIM as the tick source, PM enabled with STOP0 and STOP1 modes.At some point, we started noticing random crashes, which seemed to occur sporadically, more often on some boards than others. These would usually be in the `idle` zephyr thread, specifically after a `wfi` instruction. Digging around, I found some errata (specifically 2.2.26 for STM32U575xx STM32U585xx, related to flash prefetch, and now also 2.2.6 for STM32U59xxx STM32U5Axxx, related to wake-up from stop mode). HardFault on wake-up from Stop mode may occur in debug modeDescriptionA HardFault may occur at wake-up from Stop mode when the following conditions are met:• Device is in debug mode.• DBG_STOP bit is set in DBGMCU_CR.• A wake-up event/interrupt from an SRD peripheral (except EXTI) occurs in a timing window of four clockcycles during Stop mode entry sequence. SRD peripherals are

Hello team, Another day,  new same issue. :pensive_face:I have setup the DCMIPP PIPE 1 for the stm32n6570 DK, so that it dumps frames in address 0x34200000 which maps to SRAM3 begin address I have enabled bothe the memories SRAM3 and SRAM4 but with out software erase, I used the MX tool for project generation , I goal is to mimic the Continous Mode example provided by ST, I have read about the appilication notes getting started with DCMIPP and the afew sections of intrest form the RM for the deve board on the topic. I however face the challenge  as stated in the Post Title, there Is are no interrups being called yet I set up the global intterrups for both the Pixel pipe and the CSI interfacing, "Still as shown in in the generated files" and set the clocks for the DCMIPP is set to 300Mhz and the CSI interface I had to manualy try setting up the  input clock freq for the IMX335 module to 20Mz as the MX tool does not provide for its setting, but I have this c

I plan to adapt the USBX host example to act as a bridge the way the current device example does.  Then I can have a full link UART -> Host -> USB -> Device -> UART and vice versa.  However, the data sent to the device is not displayed over its UART as expected and the device stops obtaining additional messages from the host.  How can I fix this so I can move on the adapt the host example and use the device to debug?Overall Goal: Implement a USB to UART bridge using USBX Host mode on the NUCLEO-U575ZISteps:Run the Ux_Device_CDC_ACM example from the example selector on a NUCLEO-U5A5ZJConfirm device example functionality:Connect the NUCLEO-U5A5ZJ USB-C port to the PC.Open two Teraterm windows: UART serial port and VCOM (over USB) portTyping into either Teraterm window causes the text to appear on the other window.  This confirms bidirectional USB to UART bridge on the NUCLEO-U5A5ZJ in USBX Device mode.Modify the device example due to lack of VBUS power bet

 Hello,I am using STM32CubeIDE with the STM32F429I-Discovery board,and my goal is to connect it with the MT9M001 camera module.As a first step toward that, I would like to make the LCD display work properly.In the STM32Cube_FW_F4_V1.28.0 package,there are many sample projects organized as follows:  Projects > STM32F429I-Discovery > Examples > LTDC > LTDC_Display_2Layers If I import this Example project into STM32CubeIDE,will the LCD automatically display the sample image?Or do I need to perform some additional setup or configuration steps?I would appreciate any advice or guidance.

Hi ST Community,    Our project uses STM32H743 (LQFP100). The system clock is set at the max 480MHz. The USB Device interrupts would occasionally cause a HardFault. For example, if we plug in or unplug the USB. The data hpcd would occasionally be 0xFFFFFFFF. Sometimes it's the hpcd->pClass[0] We have enough size for the stack and heap. A "workaround" is to lower the system clock to 240MHz...   What we don't understand is that the USB clock source is from the "RC48" 48MHz clock, independent from the system clock, which sources the HSE. How does lowering the system clock help resolve this issue? We also tried using HSE to generate the 48MHz for the USB, but the USB just doesn't run. Is there other settings or configurations that we might have set incorrectly?   Another thing to mention is that we have a conflict with the RCC CRS SYNC.                    Attached is our clock configuration and .ioc file for your ref

Hello, my project is using all 4 SPI interfaces on the STM32G474. SPI1-3 all work flawlessly, but SPI4 never triggers the RXNE flag. All SPI buses are configured identically, with the only differences being the pinouts and APB1 vs 2 bus. I am polling the transactions directly.Initialization:if (hspi_.Instance == SPI1) LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_SPI1); else if (hspi_.Instance == SPI2) LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_SPI2); else if (hspi_.Instance == SPI3) LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_SPI3); else if (hspi_.Instance == SPI4) LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_SPI4); LL_SPI_SetMode(hspi_.Instance, LL_SPI_MODE_MASTER); LL_SPI_SetTransferDirection(hspi_.Instance, LL_SPI_FULL_DUPLEX); LL_SPI_SetDataWidth(hspi_.Instance, LL_SPI_DATAWIDTH_8BIT); LL_SPI_SetClockPolarity(hspi_.Instance, LL_SPI_POLARITY_LOW); LL_SPI_SetClockPhase(hspi_.Instance, LL_SPI_PHASE_1EDGE); LL_SPI_SetBaudRatePrescaler(hspi_.Instance, LL_SPI_BAUDRATEPRESCALE

Hi,I am new to STM32 and using DSI for the first time.I generated the simplest code for bringing up a custom DSI display board using CubeMX and TouchGFX. The code compiles successfully, but the CubeMX-generated function HAL_DSI_Init() within MX_DSIHOST_DSI_Init() (code snippet below) returns HAL_TIMEOUT at line 26.By default, HAL_TIMEOUT is set to 100ms, which is quite a long time...      /* Get tick */ tickstart = HAL_GetTick(); if ((hdsi->Instance->PCONFR & DSI_PCONFR_NL) == DSI_ONE_DATA_LANE) { while ((hdsi->Instance->PSR & (DSI_PSR_PSS0 | DSI_PSR_PSSC)) != (DSI_PSR_PSS0 | DSI_PSR_PSSC)) { if ((HAL_GetTick() - tickstart) > DSI_TIMEOUT_VALUE) { /* Process Unlocked */ __HAL_UNLOCK(hdsi); return HAL_TIMEOUT; } } } else { while ((hdsi->Instance->PSR & (DSI_PSR_PSS0 | DSI_PSR_PSS1 | DSI_PSR_PSSC)) != (DSI_PSR_PSS0 | \ DSI_PSR_PSS1 | DSI_PSR_PSSC)) { if ((HAL_GetTick() - tickstart) > DSI_TIMEOUT_VALUE) { /*

Hi ST community// --- EDIT --- Missed preview and made some corrections / clarificationsI'm looking for a way to mount a SD card using the Azure RTOS UsbX MSC class, while the MCU is running. The code is mostly based on the ST examples, e.g.:https://github.com/STMicroelectronics/x-cube-azrtos-h7/tree/main/Projects/STM32H735G-DK/Applications/USBX/Ux_Device_MSC The example expects that the SD card is already inserted on power up - therefore the MX_SDMMC1_SD_Init() is called before the USBX device is registered. Therefore the LBA and Blocksize values are already available when the USBX device is registered.I want to have a more general case, where I can remove and insert a SD card while the application is running. A separate thread (SD_thread_entry) which handles this behaviour and is waiting for the SD card pin to be detected. The card is then power reset, the HAL is initialized and the CardInfo read:void SD_thread_entry(ULONG thread_input) { // Thread variables ULONG flags; bool

I have integrated lwip on my STM32H563RGT6  library and my requirement is to establish connection to my AWS endpoint from MCU to the cloud along with certificates. help me by providing the necessary stacks.Were my requirement is to send/publish some data into mqtt inside the IOT core AWS.

Hello, I've built a project with an STM32F767 and a USB HID connection. I also have a Visual Studio 2010 application to set PA0 to 1 for testing. My connection is established, and in Device Manager, the USB Custom HID device is recognized, but I can't set PA0 to 1. I built my USB HID code using Cube MX and the HidLibrary.dll driver for VB2010. I don't understand why I'm having this problem. Can anyone help? I am able to get a result, temperature acquisition and change of state of PA0 in CDC mode. Best regards. My code is attached. Sébastien.  

Hi @FBL I am working on a similar project like This one (USB CDC ACM device with Power Delivery in Source mode using USBX in standalone mode, FreeRTOS and USBPD with a TCPP02). The STM32 used is the H573I.I have found some code to add in the function USBPD_DPM_Notification() in usbpd_dpm_user.c (solution you gave).But in my code, the functions called are undefined because the file usbpd_usb_if.c is not generated. What I am missing?

My goal is to use timers to follow the required timing steps for a module I’m working with. To achieve this, I decided to use two timers — TIM1 and TIM2.TIM2 is responsible for counting the T1 time step. For this, I’m using One-Pulse Mode, so TIM2 is configured to count a 2 µs delay.After TIM2 finishes, TIM1 should be triggered. TIM1 also operates in One-Pulse Mode, this time generating 25 pulses to imitate the PD_SCK signal (as shown in the datasheet timing diagram).Each pulse should stay HIGH for half of the full period (20 µs), so 10 µs HIGH and 10 µs LOW.During the generation of those 25 pulses, the DOUT pin (connected to TIM2_CH2) should be sampled. At that time, TIM2 should be disabled.Unfortunately, it is not working, this is my code:void start_measurement(void){ if (HAL_TIM_OnePulse_Start(&htim2, TIM_CHANNEL_2) != HAL_OK) { Error_Handler(); } if (HAL_TIM_Base_Start(&htim1) != HAL_OK) { Error_Handler(); } } } void HAL_TIM_PWM_PulseFinishedCallba

Hi everyone,I’m using the WS28XX library by NimaLTD from GitHub::backhand_index_pointing_right: https://github.com/nimaltd/ws28xxSetup:STM32F103TIM3 Channel 4 as PWM outputData pin on PB18×8 WS2812B LED matrixInitialization and pixel updates work perfectly:WS28XX_Init(&ws, &htim3, 72, TIM_CHANNEL_4, 64); WS28XX_SetPixel_RGB(&ws, 0, 100, 0, 0); WS28XX_Update(&ws);Issue:Immediately after power-up, some LEDs (LED 41 an 10-12 following) light up before WS28XX_Init() is even called.On the logic analyzer, I can see a valid WS2812B data burst right after startup,covering up to LED 40 with "0", followed by a ~100 ms gap,and only then my actual data frames appear. Once WS28XX_Update() runs, everything looks correct and stable.Questions:What generates this initial data burst on the PWM pin?Could TIM3 or DMA be triggered automatically during startup?Does CubeMX initialize the PWM channel before main() executes?Has anyone seen similar behaviour with WS2812B + DMA on STM32?Than

Hi,On the STM32N6570-DK board, I’m running an application that uses TouchGFX and FileX.Both the TouchGFX frame buffer and FileX temporary buffers are located in external memory (XSPI1).I’m observing intermittent write failures when SDMMC IDMA is used for direct transfers from external memory to the SD card. The issue appears as incorrect data being written — typically affecting the entire transfer block (a few kilobytes), as shown in the image below.External memory is attributed as non-cacheable all the time. Selecting various shareability options for the ext memory introduces very strange behavior, so it's been disabled finally.However, when the write operation is performed from internal SRAM (either via an intermediate buffer in SRAM or the FileX driver’s scratch buffer), the transfers are always successful.I’ve also found a very similar case involving the TouchGFX frame buffer and SD card buffer in external memory on the STM32F7 platform.https://community.st.com/t5/stm32-m

Not sure whether its me looking at the wrong places but I can't find the project that came with the Nucleo-FR401RE eval board? Looked under the STM32CubeF4 examples, nothing seems to match.Can somebody point me to the right place?Thanks-- Alex

Hi All, I am using ThreadX on an STM32H753. The version of ThreadX being used is 6.1. I use this older version because it is ISO-62304 certified. All is functioning as desired but each time I execute code generation from CubeMX the ThreadX files are overwritten with version 6.4 (not certified). Is there any way I can avoid the update of ThreadX when I regenerate the code from CubeMX? Thank You, Gil

I have read these forums and I see some have successfully got the F407 connected to KSZ8863 working. I am trying to do a simple non managed switch RMII PHY connection to the third port with no luck. I have confirmed the 50mhz clock input to the KSZ8863 is working as I can get port 1 and port 2 to transfer packets between each other, no issues at 100mbps just no packets to the processor. The schematic pdf I upload here shows my physical connections to the 407 and in the past I have successfully use the DP83848 out of the box. If anyone has a connection diagram to the 407 that works it would be much appreciated if you could share it along with any driver that you might have used.Update: I added a screenshot showing I do see rx data activity on the RII interface back at the processor.Thanks,

Hello everyone, I have a problem with my STM32L011G4U6, I want to put it in stop mode or in standby mode, but the two modes are not taken into account, only the sleep mode works, I must surely make a mistake but where? here is my function:   void Enter_MCU_Sleep(void) { HAL_Delay(1000); HAL_UART_Transmit(&huart2, (uint8_t *)"Dort\r\n", 33, 300); // Configurer et lancer le timer __HAL_TIM_SET_COUNTER(&htim2, 0); HAL_TIM_Base_Start_IT(&htim2); // Timer doit générer une IT de réveil // Désactiver les périphériques pour réduire la consommation //HAL_ADC_DeInit(&hadc); HAL_UART_DeInit(&hlpuart1); HAL_UART_DeInit(&huart2); //__HAL_RCC_ADC1_CLK_DISABLE(); __HAL_RCC_LPUART1_CLK_DISABLE(); HAL_NVIC_DisableIRQ(EXTI4_15_IRQn); HAL_NVIC_DisableIRQ(DMA1_Channel2_3_IRQn); HAL_NVIC_DisableIRQ(DMA1_Channel4_5_IRQn); // Désactiver le RTC et l'oscillateur LSE HAL_RTCEx_DeactivateWakeUpTimer(&hrtc); // Désactiver le wakeup timer RCC

Hi all, this is my first project with the STM32H5 and the new FileX/UsbX, before I was using G0 and F4 chips and knew my way around the FatFS and USBD software packages... A new project made the use of the H5 necessary because it has a USB and SDMMC peripheral. I want to configure the H523RCT6 as a USB mass storage device that gets detected by a PC and provide mass data storage via the SD-card (SDMMC1 peripheral). As soon as the PC puts a file on the SD card I need to detect it and stream it via UART to a different device... My problem is that I can't find a configuration that allows me to simultaneously use the SD-card as mass storage for the PC and detect when the contents were changed on the card. Right now every possibility I considered are suboptimal or do not work.  Option 1: periodically init the FileX on the SD-card, check for files and transmit them via UART, then de-init FileX and init USB MSC. The problem here is that I cannot detect when the USB transfer is finished. I

I try to write my Bootloader using stm32l1 MCU and project from link but my mcu not powerful 32MHz max and have slow flash write memoryhttps://github.com/sfyip/STM32F103_MSD_BOOTLOADER/blob/master/Src/Principle: emulate Fat32 file system and directly write new firmware to flash memory with decoding it from STORAGE_Write_FS() function. Everything works, but when file size >100KB, sometimes errors occur. 50% of write tests fail. Bootloader check CRC firmware, Windows sent error, or end copies but not full firmware write. Maybe you have ideas how to solve this problem?

Split from this thread. (new question) You might be right. However it was made based on the well described example I have found. https://deepbluembedded.com/stm32-adc-multi-channel-scan-dma-poll-single-conversion/ I was trying tu run DMA but it was not working at all. I mean it was never transfering the data from ADC to the memory. Thats why I moved back to simpler example. Below you have DMA (one shot mode) that didn't work for me. Was trying the Circular mode as well but no change. /* USER CODE BEGIN Header */ /** ****************************************************************************** * @file : main.c * @brief : Main program body ****************************************************************************** * @attention * * Copyright (c) 2025 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 file comes with this software, it i

Hi,Looking into STM32CubeN6\Projects\STM32N6570-DK\Examples\SD\SD_ReadWrite_DMA example,I see that quite heavy operations are used:SCB_CleanDCache_by_Addr (aTxBuffer, BUFFER_SIZE); // ... SCB_InvalidateDCache_by_Addr (aRxBuffer, BUFFER_SIZE);while the aRxBuffer[] and aTxBuffer[] are located in a noncacheable memory region.uint8_t aTxBuffer[BUFFER_SIZE]__NON_CACHEABLE; uint8_t aRxBuffer[BUFFER_SIZE ]__NON_CACHEABLE;Could you please explain why?Regards,A