STM32 MCUs

Hi everyone, I'm new to STM32 and I'm building an audio player. I'm using an SD card (via SPI) to feed audio data to a dac via I2S.The audio stutters and often plays the same 1-2 second snippets twice before moving on.I've tried implementing double buffering and i've checked the i2s configuration in circular mode.Code:https://github.com/darty555/stm32-i2s-dma.git

I am experiencing difficulty getting the NUCLEO-WL55JC1 to properly enter Shutdown mode. In some cases, the device appears to enter Shutdown mode but exits immediately. In other cases, it remains in Shutdown mode, but the current consumption is approximately 1 mA. The procedure I am using to enter Shutdown mode is straightforward, yet the behavior does not seem correct. Could you please advise on possible causes or recommended debugging steps for this issue?

As asked in the subject: Is there a hole in the memory map of the STM32C552VC (Bank1 from 0x08000000 to 0x08020000 / Bank2 from 0x08040000 to 0x08060000) or are the two banks continuous from 0x08000000 to 0x08040000)

I'm looking to implement USB host functionality on an STM32C071 to connect with a single device that sends/receives serial data over USB so the only class I'm interested in is CDC, but I'm having trouble using USBX (I'm not using RTOS). For now I haven't used and read/write functions, my goal was to start by checking the functionality of the callbacks inside "app_usbx_host.c" which are: device inserted/removed/connected/disconnected, enumeration fail and no USB device found. Each one sets a different flag to be handled inside the main loop. I put a breakpoint inside the USB IRQ and when I connect the USB device it stops execution and confirms the breakpoint has been reached, however none of my flags are ever set,. I suspect the reason might be because I haven't done anything to link the USB peripheral to the USBX stack, if the function responsible for that is ux_host_stack_hcd_register, I have no idea how to use it. The function prototype is:UINT _ux_host_stack_hcd_

Hi guys,I'm working on custom board with STM32F411 + spiflash for a project with Touchgfx (partial buffer).At the moment I got spiflash and STM32F411 working via SP1 + DMA and that's fine.I'm using IAR 9.70 for this project and I'm facing an issue with external flash loader when I do a debugging session.When I start a debugging session, flash is programmed and the external loader programs the spiflash too.But on the end of the programming the procedure fails with:  Sun Mar 29, 2026 21:45:19: Initial reset was performedSun Mar 29, 2026 21:45:19: Loaded debugee: C:\Program Files\IAR Systems\Embedded Workbench 9.2_3\arm/config/flashloader/ST/FlashSTM32F4xxxRAM128K.outSun Mar 29, 2026 21:45:19: Target resetSun Mar 29, 2026 21:45:26: Unloaded macro file: C:\Program Files\IAR Systems\Embedded Workbench 9.2_3\arm/config/flashloader/ST/FlashSTM32F4xxx.macSun Mar 29, 2026 21:45:26: Loaded macro file: D:\ARM\STM32F411\AlphaTui\CubeMx\AlphaTui\EWARM/icf/ExtSPIFLd.macSun Mar 29, 2026 21:

Hello everyone!I’ve been struggling to create a working application on the P-NUCLEO-WB55. My goal is to implement a Zigbee On/Off Client Sleepy End Device (SED) with NVM support, using buttons for control.I was able to successfully reproduce the On/Off Client SED with NVM and low power consumption (around 3 µA), measured using the ST-Link Power Monitor. However, in that example project, a timer is used to trigger the On/Off commands.I created a new application that uses buttons instead of the timer, but now the device never enters sleep mode and behaves quite strangely. Based on the current consumption spikes, I can see that the device is transmitting data. In Wireshark, I can see that packets are being sent, but Home Assistant does not react to the commands at all.I have attached my app_zigbee.c file. Could someone please help me understand what I am doing wrong?Perhaps someone could share a working example of a Zigbee On/Off Client SED with NVM support and button control. Such an exa

I have established BLE advertisement and connection is established successfully between ST BLE toolbox and the stm32wb55 based board. I am unable to read the chateristic value from the st ble tool box. My code is  in custom_app.c   file I2C_HandleTypeDef hi2c1; int sizecharwrite; uint8_t my_value =5; float adc_voltage_ble = ADS1115_readSingleEnded_AIN0(&hi2c1); uint8_t pPayload; sizecharwrite=snprintf( ble_voltage,sizeof(ble_voltage),"%0.2f", adc_voltage_ble ); if (sizecharwrite < 0 || sizecharwrite >= sizeof(ble_voltage)) { // Error or truncation return; } memcpy(pPayload,&ble_voltage, sizeof(ble_voltage));   In the cutom_stm.c    file aci_gatt_update_char_value(CustomChemdetectHdle, CustomCharwriteHdle, 0, /* charValOffset */ SizeCharwrite, /* charValueLen */ (uint8_t ) pPayload); Edited to apply source code formatting - please see How to insert source code for future reference.

Hi Team,We are observing persistent and repeatable debug connectivity issues on multiple custom boards based on the STM32H745BIT6 MCU. These boards were initially functioning as expected; however, after repeated debug sessions, they started exhibiting failures. We request your support in identifying the potential root causes and guidance on recovery. We have performed Full Chip erase also whenever it was possible.  Below are our consolidated observations captured across multiple boards.Observed IssuesDebug Interface Failures After Multiple SessionsAfter several debug sessions, the following errors are observed intermittently:TARGET_HELD_UNDER_RESETTARGET_NOT_HALTEDTARGET_NO_DEVICEError: Unable to get core IDInconsistent Connectivity Between ToolsThe device intermittently connects using STM32CubeProgrammer.The same device frequently fails to connect in Debug mode using STM32CubeIDE.Loss of Debug Connection During RuntimeDuring debugging, the controller runs for a few seconds.T

I'm trying to configure and generate a project with STM32CubeMX for the STM32WBA5MMGHx BLE module.When enabling the STM32_WPAN middleware, the ADV_TRACE module gets automatically enabled under Utilities. This in turn requires to enable at least one UART/LPUART peripheral, otherwise type UART_HandleTypeDef is undefined and compiler throws and error:../../Core/Inc/app_conf.h:304:8: error: unknown type name 'UART_HandleTypeDef'; did you mean 'RTC_HandleTypeDef'? [build] 304 | extern UART_HandleTypeDef huart1; [build] | ^~~~~~~~~~~~~~~~~~ [build] | RTC_HandleTypeDefThe STM32_WPAN throws a warning about not configured/wrong Platform Settings.Is there any possibility to configure STM32_WPAN without ADV_TRACE enabled?Used STM32CubeMX version is 6.17.0 and WBA firmware v1.19.0 and cmake project is generated.

The list of #include in the main.c file is lost when regerating stm32cubemx with new GPIO config :Previous : /* 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 file comes with this software, it is provided AS-IS. * ****************************************************************************** */ /* USER CODE END Header */ /* Includes ------------------------------------------------------------------*/ #include "main.h" #include "string.h" #include "exti.h" #include "embedrt_debug.h" #include <stdio.h> #include <stdbool.h>After regeneration with mx: /* USER CO

I have a program where I have TIM2 CH1 set up in output compare mode. Approximately 0.5 ms after the timer is reset, CH1's compare value is reached. This triggers the CH1 DMA, which is a dummy DMA on DMA1 channel 1. The SPI TX DMA is synced to the TIM2_CH1 DMA (with a request count of 16, to allow 16 bytes through the SPI), and therefore if it is armed should automatically start at that moment. The purpose of this is to eventually provide an interrupt-free delay for an external SPI slave that requires a 350ns delay between CSn active and SCLK active.I have this all mostly working, but my problem is that about 5% of the time, the SPI DMA does not complete. I can't figure out what in my code is allowing this to happen. The basic structure is:Arm SPI DMAs.Reset TIM2 counter.Wait until the DMA completes. (This should be triggered by TIM2 reaching the compare value.However, for reasons I cannot understand, about 5-10% of my transfers never appear to start -- I wait for a long period of time

I have an stm32h7s78-dk and I created a GUI with TouchGFX.  I am trying to transmit some data via UART when a button is pressed.  I have the virtual function triggering in my MainDisplay and I was trying to use FreeRTOS and Queues to communicate from the virtual function from the button press to the uart task that I created via STMCubeMX.  For some reason though, the screen stays black when I try to use an if(xQueueReceive(queueHandle, &message, 0) == pdPASS) { printf("Message received"); }in my uart task. If I comment out this code then everything works fine and the GUI is visible.  I'm not sure what I'm doing wrong.  Here is my main.c/* USER CODE BEGIN Header */ /** ****************************************************************************** * @file : main.c * @brief : Main program body ****************************************************************************** * @attention * * Copyright (c) 2023 STMicroelectronics. * All rights rese

Hi,for a project involving a custom educational flight controller, I need to use the following hardware:- steval-FCU001V2 board- steval-drone02 drone kitFor clarity, here are st product page links that i used.Manual:https://www.st.com/resource/en/user_manual/um3117-how-to-build-your-own-minidrone-with-the-stevaldrone02-and-stevalfcu001v2-stmicroelectronics.pdfSteval-drone02 Drone kit companion:https://www.st.com/en/evaluation-tools/steval-drone02.htmlSteval-FCU001V2 FCU board:https://www.st.com/en/evaluation-tools/steval-fcu001v2.htmlMy main issues are as follows: I can’t get it to fly with the factory-loaded firmware, and I can’t even reload the firmware.I followed the UM3117 manual to assemble the kit and perform the initial tests. Compared to the materials and manuals available for version V1 of the drone kit and the Steval FCU001V1, this one seems less comprehensive, and in some images the connections aren’t very clear.When I connected the motors according to the manual, I found th

Could you provide a routine for reading and writing external flash using spi+dma+ interrupt in the STM32F407 standard library?

(HAL_SPI_Transmit_DMA works partially, HAL_DMA_Start_IT not working)I’m working with an STM32U5 MCU using SPI3 with GPDMA to drive an ILI9341 display. I’m trying to transmit a larger buffer (~23040 bytes), but display only receives about 1024 bytes, and goes into HAL_SPI_STATE_BUSY_TX forever.Function used: HAL_SPI_Transmit_DMA()Configs:  Thanks in advance !

My FMC clock, set to continuously generated, only cycles during a bus transaction.On my STM32N657I0H3Q, I have the following setup:FMC enabled in applicationChip Select NE1Muxed PSRAMData/Address: 16 bitsClock: Burst Read WriteAddressValid: YesWait: SynchronousThen, in the configuration, I have "CLK generated continuously" set. I have confirmed all of these settings in the resulting fmc.c code. I've also verified at runtime that hsram1.Instance->BTCR[FMC_NORSRAM_BANK1] = 0x183997(Where 1<<20 -- 0x1000000 is continuous clock generation).Meanwhile, my oscilloscope shows the FMC_CLK waveform:Clearly not continuous! 

seriously i just want to design my product around an mp2. literally any. i cant pick one because none of them are in stock.im clicking every single mp2 variant that exists. then im picking the sub variant, and then the package. like 3 trees deep. not a single one ive found so far is in stock. these have been out for like years now. how am i supposed to use this chip in my product if it's availability is near non existent?really bad look for st here. 

When a USART is configured without a clock, the code generator treats it as a UART and assigns HAL_UART_IRQHandler as the interrupt handler. However, within this handler, there is a blocking operation during the idle process:(void)HAL_DMA_Abort(huart->hdmarx);When certain error conditions occur, the code can become stuck in HAL_GetTick(). This happens because the SysTick priority is lower than that of the UART interrupt. I have observed this behavior multiple times, particularly when noise is present on the UART signal line.Has Anyone seen this situation before?

Hello,I have two Winbond W956D8MBYA (64Mb, x8) HyperRAM chips connectedto XSPI1 on STM32H7S3 in dual memory mode (DMM=1):- Chip #0 → IO[7:0] + DQS0- Chip #1 → IO[15:8] + DQS1- Shared: CLK, NCLK, NCSI need to run at 200 MHz, so I need to configure CR0 on both chips:- Initial latency = 7 cycles (default is 6, valid only up to 166 MHz)- Fixed latency (required for dual mode per RM0477)Problem:According to RM0477, in HyperBus 16-bit dual mode:1. Variable latency is not supported (LM bit in XSPI_HLCR must be set)2. Register space access uses only IO[7:0]. Quote from RM0477:"IO8 to IO15 being not used but driven by the controller"So I can only access registers of chip #0.I also tried MSEL bit in XSPI_CR to switch to IO[15:8] in single memHyperBus mode - no effect.Questions:1. How to write CR0 to chip #1 connected to IO[15:8]?2. Is there any way to initialize each chip separately beforeswitching to dual mode?3. Does the controller duplicate data on IO[15:8] during registerwrite in dual mode?M

When I click this button, my mouse keeps spinning but the program does not open, and there is no error message. I tried using Refresh Data, but it had no effect.

Hello ST Community!I've been trying to recreate the DCMIPP_ContinuousMode example with STM32CubeIDE, but have been running into some issues with the IMX335_Probe function, the ID read by the I2C bus never matches the expected define IMX335_CHIP_ID. The original example runs completely fine in the STM32N6570-DK.- AXISRAM3 (0x34200000) is being used as the address for the DCMIPP CSI Pipe.- ISP Middleware does not return any errors in initialization.- All files regarding IMX335 registers and functions match with the original examples. Same for all the BSP drivers.- RIF has been configured for all peripherals involved.- AXISRAM3 has been enabled in the CubeMX configurations, and it's clock has also been enabled.static void IMX335_Probe(uint32_t Resolution, uint32_t PixelFormat) { IMX335_IO_t IOCtx; uint32_t id; /* Configure the camera driver */ IOCtx.Address = CAMERA_IMX335_ADDRESS; IOCtx.Init = BSP_I2C1_Init; IOCtx.DeInit = BSP_I2C1_DeInit; IOCtx.ReadReg = BSP_I2C1_ReadReg16; IOC

Recently, I encountered a tricky problem, I used STM32F405VGT6 this IC, but I found that it could not enter DFU mode normally, after repeated troubleshooting, I found that when the chip was USB probed, HSE was detected and did not vibrate, I also saw a similar article on the forum, I noticed that in the article, changing F405 to F429 can enter DFU mode normally.Further investigation, comparing the difference between the two ICs, it was found that the HSE start-up timeout time of the F405 IC was too short, and the HSE timeout time of the F405 was found from AN2606, and the version of the v3 version was 0.79ms, and the version of the v9 was relatively normal with 96msI want a timeout of 0.79ms, how do I do that? Is there any way to start HSE within 0.79ms of bootloder version v3? I hope the official can give an answer, thank you very much    

HelloAs I am trying to connect the STM32N6570-DK board on the STM32CubeProgrammer, initially the STM32CubeProgrammer recognises my device as in the following picture: When I press Connect on the STM32CubeProgrammer I get awarning: Connection to device 0x486 is lostas in the following picture: and then an error that says Data read failas in the following picture: I am using a MacBook Air M3, 2024, but even on windows (running on a virtual machine) I get the same error on the STM32CubeProgrammer windows version.Is there a way to overcome this issue? What could be the cause? Thank you 

Good day,We are using a composite USBX device class combining CDC and MSC over USB Full Speed, built on X_CUBE_AZRTOS-H7 version 3.3.0 (USBX 6.4). During testing we discovered that a certain Windows PC sends a MODE SELECT(10) command (opcode 0x55) and causes an endpoint stall.After a rather long debugging session, it was found that the USBX source _ux_device_class_storage_mode_select() is explicitly not implemented — it stalls the OUT endpoint, UX_FUNCTION_NOT_SUPPORTED (which is not checked in the thread) and never recovers:The MODE SELECT(6) SCSI command is not even implemented and the storage thread falls through to the default case, also triggering a endpoint stall. So:- Are there any plans to implement these MODE SELECT(6/10) commands properly in a future USBX release?- Does anyone already have a workaround for this?- Wouldn't it be cleaner to reply with an ILLEGAL REQUEST instead of stalling the endpoint?System details:- MCU: STM32H7- USBX version: 6.4 (X_CUBE_AZRTOS-H7 3.3.

Hi ST Family,We are using STM32H745BIT6 MCU in our design and interfaced the same to multiple I2C slaves. For I2C lines, we have connected pull up of 2.2K to 5V power rail. In STM32CubeMX, we are enabling "No pullup or No pull down" for I2C lines.Since this MCU family is "not true open drain" ( Page 202 of datasheet), we need to know if we can continue with this configuration.Over the long run, do we see any issues of I2C engine going bad because of this configuration.?Regards..