STM32 MCUs Embedded software

Hallo everyone,Before I encountered a bug in an USB_OTG_FS library function (see previous post), I struggled to find out when the function  'CDC_Transmit_FS(uint8_t* Buf, uint16_t Len)' has finished, meaning the content of the 'Buf' argument is completely transmitted.After a thorough search through the various sources and the Reference manual RM068, I concluded the Register DOETMSK has a bit XFRCM that should fire an interrupt in case the the transmission has finished. I assume the common interrupt function ' HAL_PCD_IRQHandler(&hpcd_USB_OTG_FS)' will deduce that function 'CDC_TransmitCplt_FS(.......)' should be fired when the XFRCM creates an interrupt.Despite my efforts I could not find a way to:   a) find out if my assumptions above are complete and/or correct   b) how to handle the registers for the USB_OTG_FS device. In the SWF column of the debugger I saw 4 groups of OTG registers, but never found a way to access them in my code. And the complexity of

Hello,I have a issue with my STM32U5G9. It does not go into standby or shutdown mode. I want to achieve a wake-up by the power button of my device. The powerbutton is connected to PWR_WKUP6 (pin PB5). The button has a 100k pull-up. I verified the voltage levels with a scope (3.3V --> 0V).I checked with the examples in the STM32CubeU5 Github repo. This my code: void LowPower::EnterStandbyMode(void) { PrepareForLowPower(); __disable_irq(); for(int i = WWDG_IRQn; i <= JPEG_IRQn; i++) { NVIC_ClearPendingIRQ((IRQn_Type)i); } /* Enable WakeUp Pin PWR_WAKEUP_PIN6 connected to PB.5 */ HAL_PWR_EnableWakeUpPin(PWR_WAKEUP_PIN6_LOW_0); /* Clear all related wakeup flags*/ __HAL_PWR_CLEAR_FLAG(PWR_WAKEUP_FLAG6); HAL_DBGMCU_DisableDBGStandbyMode(); /* Enter the Standby mode */ HAL_PWR_EnterSTANDBYMode(); // If entry fails (e.g., if a debugger is attached), reset the system NVIC_SystemReset(); } I have a similar function for shutdown mode. I tried to clear all inte

Hello,Normally we use HAL_GetTick() in HAL driver.I want to use GetTick() in STM32 LL driver. How to get and use GetTick() in STM32 LL driver?

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Hello there, I'm trying to create an external loader for my stm32h7s7-dk board via MCE.I followed this https://www.youtube.com/watch?v=JxhKmVUB2Ws&list=PLnMKNibPkDnFQXYK0ztHV9iMVS6EAtKpD&index=10 tutorial series and i check the github repo of this project. But the repo and the video series can be different. The instructor might add some new things. But the methodlogy cant work. Its really stupidly. The loader writes only 0x00 to flash for app size.Im adding my ss of the mem_copy, mem_write and mpu init codes here.   Please help me.

Cube setting is OK!First run OK!if(HAL_OK != HAL_UART_Transmit(CO_INFO.channel, co_dma_tx_data, send_len, 0xFFFF))    {        DEBUG_PRINT("CO MODULE SEND DATA ERROR!!\r\n");    } Then setting OK!if(HAL_OK==HAL_UART_AbortReceive(CO_INFO.channel))if(HAL_OK==HAL_UARTEx_ReceiveToIdle_DMA(CO_INFO.channel,(uint8_t*)CO_INFO.RX.data,CO_UART_BUF_LENGTH)) But second run Fail !!if(HAL_OK != HAL_UART_Transmit(CO_INFO.channel, co_dma_tx_data, send_len, 0xFFFF)) trace HAL_UART_Transmit() functionif (huart->gState == HAL_UART_STATE_READY) the huart->gState value always 0x33so always return HAL_BUSY

Hi there!I already configured LwIP package and make it work on a NUCLEO-H755ZIQ following @Adam BERLINGER gude in the Knowledge base section:https://community.st.com/t5/stm32-mcus/how-to-create-project-for-stm32h7-with-ethernet-and-lwip-stack/ta-p/49308 Well, trying to move the LwIP heap memory to a larger memory location I experienced a n unexpected issue:When I locate the heap in the DTCMRAM of the M7 core, communication will no more work at all(no ping, no tcp connection...).Locating it in D1 (AXI RAM) or D3 RAM all work as expected.I checked also the MPU configurations ad all seems correct, it seems that in DTCMRAM there is a different behavior. Just for my comprehension, there is something wrong in locating such heap into the DTCMRAM?Thanks in advance! iTTy 

ST moderator: updated the title with the MCU part number. I am working on an embedded web interface hosted on an STM32-based system using lwIP. The interface serves basic HTML pages along with multiple product images for browsing and preview.On pages that contain several high-resolution images, similar in structure to pages like  this: I notice slower load times and occasional rendering delays when everything is served directly from the MCU web server.For those with experience building embedded web servers on STMicroelectronics platforms, what techniques have you found most effective for improving image delivery and overall page responsiveness?Examples could include compression approaches, external memory usage, filesystem choices, or caching strategies.Looking for practical guidance based on real implementations.

I have an STM32H563 running FreeRTOS and LwIP with the netcon interface.For the most part its working OK, however when I send a lot of data (around 250KB/s for a few seconds) it crashes with a HARD_FAULTIt looks like the memory (pbufs) are being corruptedThe driver (etherentif.c) is based on LwIP/LwIP_HTTP_Server_Socket_RTOS/Src/ethernetif.ctaken from the STM32H7 cubeIs there an updated driver for the STM32H5 or one with known reliability ? 

Expected Log using UART :[BOOT] UART initialized successfully[BOOT] Starting ThreadX kernel[NET] NetX Duo initialization started[NET] IP stack and protocols enabled[TX] ThreadX kernel running[NET] NetX application thread running[NET] Network stack ready[NET] Static IP: 192.168.1.1But the it breaks at [NET] NetX application thread running and i have found the following error using debugger and stucked at the error, so need guidance on bring up of Ethernet and perfect log using the UART  I want to send the data from the pc to the STM Board through the ethernet [using] TCP and store the data at some memory so initially i want to bring up the flow and stucked at the error. main.c/* USER CODE BEGIN Header */ /** ****************************************************************************** * @file : main.c * @brief : Main program body ****************************************************************************** * @attention * * Copyright (c) 2026 STMicroelec

Hi,I want to kick ADC1 IN5 with the Timer TIM2. I'm working with CubeIDE.I select:ADC1 -> ADC_Regular_Conversion_Mode -> External Trigger Conversion Source  -> Timer 2 Trigger Out eventTIM2 ->  Trigger Output (TRGO) Parameters -> Update EventBut ADC1 does not run, Data Register is constant.If I kick ADC1 by software everything is fine, I get some noisy numbers.TIM2 is running, the count register is counting.Why does TIM2 not kick ADC1 by the TRGO event?This setup used to work fine on STM32F303. What do I miss on the STM32F429?THX CheersDetlef 

Hi,I am currently facing an issue while connecting to the STM32 board using STM32CubeProgrammer. The tool consistently shows the error: "Unable to read device ID from ROM table."I have already tried the following troubleshooting steps:Performed a hardware/software/core reset using the RESET buttonVerified that all required supply voltages are correctChecked the hardware connectionsDespite this, the programmer is still unable to establish communication with the M7 core via ST-Link. It appears that the device is not being detected properly, and at the moment the board has become unusable.Could you please guide me on possible causes or additional steps I can take to resolve this issue? I would be happy to provide any further information if required.Thank you for your support.Best regards,Prathiksha

I am using the ST Host library version 3.54 on an STM32F769 device, supporting HID devices.  I am using the internal Full Speed phys.I have a USB mouse connected and all works fine, however I would like to save power when the mouse is not being used by putting it into suspend.  I cannot see any support for this in the ST middleware, so I asked Ai and got this:USBH_StatusTypeDef USBH_LL_Suspend(USBH_HandleTypeDef *phost) { HCD_HandleTypeDef *hhcd = phost->pData; USB_OTG_GlobalTypeDef *USBx = hhcd->Instance; uint32_t USBx_BASE = (uint32_t)USBx; USBx->GINTMSK |= USB_OTG_GINTMSK_WUIM; /* Suspend the port */ USBx_HPRT0 |= USB_OTG_HPRT_PSUSP; return USBH_OK; }This works fine - the mouse powers down and there is a useful drop in power consumption.However, I cannot get the port out of standby.  This is the code Ai gave me for the Host to awake the port:USBH_StatusTypeDef USBH_LL_Resume(USBH_HandleTypeDef *phost) { HCD_HandleTypeDef *hhcd = phost->pData; U

Hello, I wonder that examples could apply Nucleo-H753ZI board... There are some examples about H743 or another one but no example for Nucleo-H753ZI board.    I understand 48k-2channel-16bit can be implemented easily, But I wonder that Nucleo-H753ZI can make 44.1kHz sampling or, 24bit input or, 4 ~ 6 channel input. I can't solve just 48kHz-24bit-2Channel input's buffer underrun problem, 44.1kHz-16bit-2Channel  buffer underrun,  and recognizing USB3300 ULPI to Nucleo-H753ZI. Is it can be done by this board? Or, Is there any spec making limits?   edit: related thread <Nucleo - H753ZI> + <USB3300 ULPI> connecting to P... - STMicroelectronics Community 

Hello everyone,I’m working with the STM32U5G9J-DK2 and trying to implement a Bootloader + XIP (Execute-In-Place) application architecture using the external flash.Target setup:A minimal bootloader running from internal flashThe main application linked to and executing from external flash (memory-mapped at 0x90000000)The main motivation is to free internal flash and validate this approach for a future MCU with very limited internal flash.What I’m specifically looking for help withProper CubeMX / .ioc configuration for the bootloaderWhich peripherals must be enabled (RCC, PWR, ICACHE, OSPI, etc.)Which peripherals should not be enabled to avoid conflicts with the XIP appAny STM32U5-specific gotchas when initializing OSPI for XIPProper configuration of the application projectRecommended changes to the application .iocWhat initialization should be removed from the app (HAL_Init, clock, OSPI, FLASH, etc.)Reference samplesSTM32Cube examples that demonstrate a full bootloader + XIP app flow on

STM32G030F6P6 microcontroller CubeIDE environment when enabling interrupt for I2C an LL_I2C_EnableIT_RX (I2C2); error occurs _______stm32g030xx.h:618:29: error: expected declaration specifiers or '...' before '(' token error occurs when any I2C interrupt is enabled  

We are starting to develop a new hardware platform and are currently evaluating the STM32H7R/S series for the main controller.The question now is which RTOS is best suited here in terms of long-term support from ST. We're going to use a lot of communication interfaces (USB, Ethernet, external WiFi/BT module, CAN), an RTOS with an integrated communication stack would make our work easier.Zephyr: High initial training effort, but you get a great framework. The two available H7RS-Eval boards are already supported, but in the video Zephyr 4.1: Status of STM32 support – Erwan Gouriou // Zephyr Meetup Grenoble Mar. 26, 2025 by @Erwan Gouriou from March of this year you can see that Zephyr support for the H7RS is not yet complete. Can anyone give an estimate of the extent to which you can already work with it or how much effort is involved in porting drivers from the H7 to the H7RS that are not yet available? I'm new to Zephyr and can't estimate the effort involved.ThreadX: Support

I am using the STM32U585RIT6 microcontroller with the B-U585I-IOT02A development kit. I need to implement USB functionality using an interrupt-based approach. In my project, I have configured USB_OTG_FS in Device-only mode, enabled the NVIC global interrupt, and enabled USBX CDC-ACM. I am using bare-metal code (no RTOS or ThreadX). After completing all the USB configurations, inside the MX_USBX_Device_Init() function I added the following initialization: RX FIFO and TX FIFO configurations USBX DCD initialization using _ux_dcd_stm32_initialize() Started the PCD using HAL_PCD_Start() In the main while loop, I am calling ux_device_stack_tasks_run(). With this setup, the USB device starts correctly and is detected as a Virtual COM Port. Now, I want to handle USB connect and disconnect events using interrupts. For this, VBUS sensing may need to be enabled. While referring to the B-U585I-IOT02A schematic, the USB_VBUS_SENSE pin is shown as PF14. However, in the MCU datasheet and in STM32Cube

 When using the STM32H743ZI Nucleo board as the I²C master and two STM32 Blue Pill boards as I²C slaves with different addresses, the master requests data from the slaves and the slaves respond accordingly. However, I²C communication  is unreliable during initial startup, and intermittent I²C errors are observed during runtime.Is there anyone to help me with this issue.Thank you.

 

ST‑LINK Mini V3E not detecting STM32H7 (Core ID error, high current when VTARGET connected)I’m debugging an issue with a custom STM32H7 board and an ST‑LINK Mini V3E. The setup includes a main PCB and a separate power PCB. So far:Power & Basic Checks3.3 V and 24 V rails are correct.Board current consumption is low when powered from either an 8 V or 24 V supply.Connections between the ST‑LINK Mini V3E and the main PCB have been verified.ProblemWhen I connect VTARGET from the ST‑LINK to the board’s 3.3 V rail, the current spikes and something starts to smell hot.STM32CubeProgrammer shows no target voltage, no device ID, and fails to read the core ID.The ST‑LINK is detected by the PC normally.Additional TestsTried a second main PCB and a different ST‑LINK Mini V3E, powering only through the ST‑LINK (no external supply). Same result: STM32CubeProgrammer cannot detect the STM32H7.I’m aware that VTARGET on the Mini V3E is an input, so I’ve tied it to the board’s 3.3 V rail as required.Ne

Hi everyone,I'm working with an STM32F401CCU6 and trying to transmit 2 bytes over I2C3 using DMA1 Stream 5 Channel 6, which is the correct mapping according to RM0368 Table 28:DMA1 Channel 6 Stream 5 -> I2C3_TXThe DMA configuration appears correct, and I do receive the DMA Transfer Complete (TC) interrupt. So the DMA request is generated, the stream runs, and the transfer completes.However, it seems like the I2C slave device (AW9523) never receives the register and data bytes. Unfortunately my osci is currently broken.The same write sequence works perfectly when I use a blocking I2C write (polling SB, ADDR, TXE, etc.). Only the DMA‑driven version fails.What I observe:START condition is generatedAddress is sent and ACKedADDR flag is cleared correctlyDMA TC interrupt firesSTOP is generatedBut the slave never sees the register or data byteDMA is configured as:DMA1, Stream 5, Channel 6Direction: Memory -> PeripheralMemory increment enabledPeripheral increment disabledByte transfersNo

Hello Sir,I urgently want to have an idea whether due to the change of LCD from HT043C KunJjian to RK043FN48H-CT672B Rocktech in 32F746GDISCOVERY Board, is there any changes in the firmware due to this?I would like to request for early response from your team, thanks for your support in advance.Note: From the post only I got a point that RK043FN48H-CT672B Rocktech changed from HT043C KunJjian, 32F746GDISCOVERY B02 and C01 - what's the differen... - STMicroelectronics CommunityBest RegardsSushant Verma

Good day,I've been working for a little on this and can't wrap my head around what the issue is, so figured I'd post here. As a start I'm doing a graduation project from a computer science education and am working on a project that requires a high speed usb to be implemented on a nucleo h755ziq. There are other pieces in play, but those have been disconnected to try and get this one part to work. To make this work I have the nucleo board and a usb3300. This usb3300 has been put on a board and connects to pins placed on the nucleo. I have quadrouple checked the pins and they are all correct. In CUBEMX I setup the USB_OTG_HS external PHY to device mode, as ill be using it as a device which will be detected by an application later in development. I have also set the middleware up for Virtual Com Port as shown below.My pinout is also setup correctly, but for the sake of detail here is the pinout.I have set up the clock for the stm to 192MHZ due to the other components that will b

Hello everyone, I am using a custom board with STM32H750 and I am trying to develop a file system with FILEX. The file system' s media is a uSD card with 10 MB/s baudrate which is communicating with the micro thanks to the SDMMC peripheral. The SDMMC peripheral's configuration is copied from one of the many examples that are available in STMCubeMX ( it has a 50 Mhz clock, 4 bit mode, no power mode save and no transceiver).The uSDcard has been formatted through the api given by FILEX (fx_media_format) following the information available during uSD card initialization ( for example sector size is 512 bytes, number of sectors and so on...).I am using the drivers given by ST for FILEX (in my case SD with IDMA) and I am trying different media size buffer (512, 1024 and 4096) which I allocate in AXI SRAM ( SDMMC1 IDMA can access only in AXI SRAM).I am experiencing two different behaviour:  If I am doing a reading operation the SDMMC is very fast while writing operation is