STM32 MCUs Embedded software

Hi all,I'm currently working on a project using a STM32H753 in combination with the Azure RTOS UsbX to create a composite class USB device (CDC ACM + MSC). As a starting point for the MSC support, I'm using this STM github example:https://github.com/STMicroelectronics/x-cube-azrtos-h7/tree/main/Projects/STM32H735G-DK/Applications/USBX/Ux_Device_MSC Unfortunately, my board only supports a 1-bit SD bus which is running at 48MHz. The composite class is working along I'm using the HAL_SD_WriteBlocks_IT / HAL_SD_ReadBlocks_IT functions. By using the IT driven approach, Windows is able to mount the SD card and I can create, edit or delete files as expected.Changing to the DMA driven functions, then the mount seems to fail, has corrupt disk naming or asks to insert a disk. I'm aware of cache coherency issues in the H7 and I setup the linker file and MPU accordingly (creating an 32kB area for the UsbX memory pool in the AXI SRAM): Linker file:/* Specify the memory

Hi,I am not able to output per I2S properly.1. I changed from a properly working driver for STM32F407 to this STM32H7A3VGTI had to learn, that the master clock is different as for the 407; here is always running (?) and the DMA did not work properly anymore.2. I made a testsetup with CubeMX (6.14.1):- I2S Philips- 48 kS- 16 bit- I2S clock = 49,152MHz- no MasterclockI simply use HAL_I2S_Transmit() for a 4 word buffer to send. The buffer is 32bit aligned and is in "normal" ram since DTCMRAM does not work for the DMA (lateron).The function generates proper output for BCK, Data and LRCK, but it never stops. It sends the last word from buffer over and over again. I can switch of i2s, than it stopps. Is this to be expected (?)3. Next approach:- Same configuration as (2), but using DMA, Half-Word(16bit) for per and mem, no fifo- The callback HAL_I2S_TxCpltCallback() is called with the right SPI-> inside I call HAL_I2S_DMAStop() to stop the DMAResult: No output at all4. Next approach:-

I'm a USB newbie and am trying to use the STM32F411CEU6 as a USB mic. I'm currently using FreeRTOS (cmsisV1) and the Cubemax USB library. My device currently enumerates normally, but when the host sends a URB_ISOCHRONOUS_IN request, my MCU won't handle it properly (according to SWD and serial port debugging, I found that the MCU won't even enter the OTG_FS_IRQHandler interrupt when the host sends this request). This has been bothering me for a long time. Here are my descriptors and some configuration code:__ALIGN_BEGIN static uint8_t USBD_AUDIO_CfgDesc[] __ALIGN_END = { /* Configuration Descriptor Head */ 0x09, // bLength 0x02, // bDescriptorType = CONFIGURATION 0x6D, 0x00, // wTotalLength = 109 bytes 0x02, // bNumInterfaces = 2 (Audio Control + Audio Streaming) 0x01, // bConfigurationValue 0x00, // iConfiguration 0x80, // bmAttributes: Bus powered 0x32, // bMaxPower: 100mA /* -------- Audio Control Interface (Interface 0) -------- */ 0x09, // bLength 0x04, // bDescriptorT

 I’m encountering an issue with XSPI1 in my application. I boot the application via XSPI2 in an LRUN configuration, and this part works perfectly. However, within the application, I need to use XSPI1 to write data to a different flash.During MX_XSPI1_Init(), the code crashes at this line:if (HAL_XSPIM_Config(&hxspi1, &sXspiManagerCfg, HAL_XSPI_TIMEOUT_DEFAULT_VALUE) != HAL_OK){Error_Handler();}I traced the crash to the exact line:IOM_cfg[0].IOPort = pCfg->IOPort;The initialization code for XSPI1 was generated using CubeMX. Interestingly, if I initialize XSPI1 in the boot project, everything works fine.I’ve already spent a week trying to solve this issue, but so far nothing has worked.I would really appreciate  suggestions to help solve my problem.

Hello,I am trying to set up  a UPD communication with a nucleo-H755ZI-Q board.Now I have the effect, that the lwip stack sends out an arp request for its own IP address.I double-checked the IP address and destination address to make sure they were correct. Does anyone have any idea, what could be causing this?Thank you.HiSt

Dear STMicroelectronics Support Team,I previously submitted a request on [ Auguest 26, 2025] (case #[00242096]) and have not received a reply.I am evaluating STM32 MCUs for an LwM2M client implementation and need clarification on ST’s official support.Questions:Does ST offer any MCU models with an official LwM2M stack or pre-integrated middleware?Please provide package names, download links, and any long-term support information.Please update the status of my open case and provide the requested technical references.Best regards,Name : Wilfred.kim (JongSeong.Kim)Company : TeladinEmail/Phone : wilfred@teladin.com/+821054147096  

To get my first sensor project done and after selecting my board, I enabled I2C1 which triggered pins PB6 and PB7 as shown below: Then used code below (in main.c) with the purpose that the LED is on when the temperature is higher than 40 degrees and off otherwise.  #include "main.h" extern I2C_HandleTypeDef hi2c1; // I2C handle from CubeMX #define HTU21D_ADDR (0x40 << 1) // 7-bit address shifted for HAL #define TRIGGER_TEMP_MEASURE_HOLD 0xE3 I2C_HandleTypeDef hi2c1; UART_HandleTypeDef huart2; void SystemClock_Config(void); static void MX_GPIO_Init(void); static void MX_USART2_UART_Init(void); static void MX_I2C1_Init(void); float HTU21D_ReadTemperature(void) { uint8_t cmd = TRIGGER_TEMP_MEASURE_HOLD; uint8_t data[2]; // Send temperature measurement command HAL_I2C_Master_Transmit(&hi2c1, HTU21D_ADDR, &cmd, 1, HAL_MAX_DELAY); // Receive 2 bytes (temperature) HAL_I2C_Master_Receive(&hi2c1, HTU21D_ADDR, data, 2, HAL_MAX_DELAY); // Combi

I'm using the STM32F401RE in a new design and trying connect the USB CDC device interface to FreeRTOS_CLI. I modified its _write function to call CDC_Transmit_FS, but I don't see a received data callback where I can add a xTaskNotifyFromISRfor to send data to the CLI task.It looks like I call CDC_Receive_FS to get the data, but I need an interrupt to trigger the call to that function. Where can I hook in a callback function?

Hello,I am developing an embedded project using the STM32H7 microcontroller, integrating FreeRTOS, FatFs file system, USB mass storage device (USB flash drive) functionality, SD card reading/writing,UART communication, and ADC sampling. My system uses LVGL as the graphical user interface (GUI) library and drives the LCD through LTDC.Core issue phenomenon:I observed that the system's functional behavior has a direct and consistent correlation with the on/off state of the LVGL screen:DISPLAY_ENABLE is a macro definition I created to control whether to use the screen.When the screen is off (DISPLAY_ENABLE = 0):All functional modules (USB mass storage mounting and writing, UART communication, ADC sampling, SD card reading/writing, database operations) work normally.When the screen is on (DISPLAY_ENABLE = 1), two different phenomena occur:Phenomenon 1: When test buffers (writeBuffer/readBuffer, 512 bytes each) are located in the data segment:USB mass storage device fails to mount (output lo

Hello there, I'm using a STM32G431KBU and programming it using STM32 Cube IDE.There are 2 pins, PB4 and PB6, both digital inputs, I'm having problem with. On both, I apply 5V with a 10K pull-up resistor, while the MCU is working is at 3V3, this should work fine, as both are five-volts tolerant (FT), as per datasheet. When connected to the pull-up resistor, the voltage on the pin drops to 1V7 - 1V6, while there is 3V3 on the pull-up resistor. It looks like there is a pull-down resistor configured on these pins, and according to the DS, these pull-down resistors are controlled by the level on PA9 and PA10:I've tried to disable these before GPIO init, but it did not work:Any recommendations on how to properly disable these internal pull-down resistors on PB4 and PB6?

Hello ST Community,I'm working on an STM32N6570-DK project where I've merged two example codes from the STM32CubeN6 repository:1 . DCMIPP_ContinuousModehttps://github.com/STMicroelectronics/STM32CubeN6/tree/main/Projects/STM32N6570-DK/Applications/DCMIPP/DCMIPP_ContinuousMode   Used for capturing data from the IMX335 camera and displaying it on LTDC.2 . Nx_WebServerhttps://github.com/STMicroelectronics/STM32CubeN6/tree/main/Projects/STM32N6570-DK/Applications/NetXDuo/Nx_WebServerModified to set a static IP and transmit packets over Ethernet and not using the SD card part and FileX.The merged code compiles successfully in STM32CubeIDE. I've attached a ZIP file containing the full merged project for reference.Initially, I used the linker script (STM32N6XX_AXISRAM2_fsbl.ld) , which allocates 512KB of RAM (255K + 256K) and manages Ethernet buffers, I attached .txt file named WORKING.Camera image is visible on the LCD.Ethernet packets (with static data) are sent at ~900

Hi, just looking to learn the best way to do this. We're aiming to create a system for STM32H7R/S where the bootloader acts as USB MSC device to store a number of different app binaries to a permanently-mounted SD card. At system restart, the booloader needs to let the user chose which of the binaries to load from the SD card (the system has a small touch screen). The bootloader would then load the binary from the SD card into the fast internal RAM and run it there. Is the External Memory Loader a good way to do this? Is this use case supported by CubeMX? Is there a good set of examples or "howto" documents?

Today I bought a new NUCLEO-H563ZI board and downloaded the STM32CubeH5 main software package from www.st.com. But when I compile the example "STM32CubeH5 main \ Projects \ NUCLEO-H563ZI \ Applications \ NetXDuo \ Nx_UDP_Cho_Server" with IAR, it prompts that some files is missing. I had to download the missing files from elsewhere and put them in. Finally, the compilation passed, but after burning the out file into the board, the program could not run properly. After debugging, it was found that there was a DMA error in the Ethernet. I changed an other example to compile, burn, and debug. the same mistake. I don't know how to solve it. By the way the net cable and the led of the ethnet socket CN14 is ok. Can ST provide a complete examples package for the NUCLEO-H563ZI board?   Title edited by ST moderator to reflect the content of the post.   

I did not understand the significance of the number 65536 in the below codepHandle->OvfFreq = (uint16_t)(pHandle->TIMClockFreq / 65536U); /* Set fixed to 150 ms */ pHandle->HallTimeout = 150U; /* Compute the prescaler to the closet value of the TimeOut (in mS )*/ pHandle->HALLMaxRatio = (pHandle->HallTimeout * pHandle->OvfFreq) / 1000U ; /* Align MaxPeriod to a multiple of Overflow.*/ pHandle->MaxPeriod = pHandle->HALLMaxRatio * 65536UL;My main confusion is how the OvfFreq with division of 65536 help the code to reduce the calculations. According to my understanding if TIMClockFreq = 170MHz then the time is T = 1/170Mhz i get overflow after 65535, so if the number of overflows are OverflowCnt then the total time elapsed will be 65535*1/170MHz*OverflowCnt + Input capture timer registers. 

I adapted the official BSP example code (available at https://www.st.com/en/embedded-software/stm32cubeu5.html, stm32cubeu5-v1-8-0.zip) to acquire and process audio. My code is running very slowly on the board. We thought the slowdown might be due to other features enabled by default that I don’t need. Therefore, I created a project from scratch, enabling only the pins I need, but I’m doing something wrong with the GPDMA1 and MDF1/ADF1 filter configuration (even callbacks don't work). Could you provide an example .ioc file with the integrated microphone configured correctly (with GPDMA1) or, alternatively, the BSP .ioc project itself (which is not included in the official example you provide)? Thank you.

First and foremost, they aren't perfect. The code has tons of work left. But it took me SO long to get ANY i2s audio data from my guitar to my computer, the major hurdle being mostly the lack of USB Microphone drivers provided by the stack.Now that I've made them, and I am pretty sure it's the other parts of the code that are at fault for the clock drift, I am sharing it in hopes that it will help someone else who was in the same boat I was.This is designed for the STM32 to be the SLAVE to a CODEC with Full-Duplex mode support (4-5 wire bidirectional I2S Standard, 16 bit 48k. I know, nothing to call home about, but it is the simplest to get working) Try your luck with your specific CODEC, maybe you can configure things differently and get it working right. On the PCM3060, this was the best I could manage.I have no field experience, no college degree, I am just persistent. If I can do it, you can too. Don't give up. I know I haven't, this is just the start.Note: if you're just picking u

Hi, My board consists of stm32h733 that interfaces SDRAM via FMC. I want to execute code from SDRAM. Code is loaded from external flash(OCTOSPI) to SDRAM at address 0xc0700000.But running the code from this region causes hard-fault disabling the Debug Port. After this I'm unable to flash firmware into the hardware. I have to bring board into "connection under reset" by connecting BOOT0 to 3.3v and NRST to GND. I have tried with multiple test firmware but always got into hard-fault. Why MCU disables, it's debug port? While debugging in the disassembly I can execute firmware running from SDRAM one by one line, but at some point code hard-fault, causing it to stuck into the above told situation. Here is the MPU config for SDRAM; /* Configure the MPU attributes for SDRAM */ MPU_InitStruct.Enable = MPU_REGION_ENABLE; MPU_InitStruct.BaseAddress = 0xC0000000; // Start address of SDRAM Bank 1 MPU_InitStruct.Size = MPU_REGION_SIZE_8MB; MPU_InitStruct.AccessPermission = MPU_REGION_FULL_ACCESS; M

Hello, I am developing a custom made PCB, for a pico balloon, mounting a STM32F103C8T6. For this project I will need to use low power techniques but before going deep into the Sleep/Standby/Stop mode I was working on understanding and reducing the power consumption of the STM32 during RUN mode. For these tests, the STM32 has only the decoupling caps in the VDD, VBAT and VDDA pins, and the rest of the PCB are left unpopulated to ensure the current consumption comes only from the STM32.I reduced the code to the minimum by just setting the Clock configuration for 8 MHz (directly from HSI, PLL and LSI off) , setting all the GPIO to INPUT + PULLDOWN + Set to RESET, configure 1 GPIO as output + set to RESET, and then wait forever in a while(1) loop.The problem is that, when I compile the project without optimization "-O0" the STM32 consumes 9 mA, however when I set the "-O1" flag the same code runs at 2 mA. In the "-O1" compilation if, instead of an empty while I have a "HAL_Delay(

Hello, I have made my own STM32F732RET6 board that has a USB FS configured as a Stereo, 24 bit 48kHz Audio Interface and SAI2 connected to an SN75176BDR (Differential Bus Transceiver IC) because I want to transmit AES3-AES/EBU (same as SPDIF) audio data coming from the USB). So USB Audio -> SPDIF TX. Problem is I cannot get it to work right and ALWAYS get noise in the output signal (I have hardware that can receive AES3-AES/EBU so I can hear it). I am suspecting this is a clock issue where the frequency of the SPDIF signal is not high enough to support 24 bit stereo 48kHz, from what I've read, this would require an SPDIF frequency of 6.144MHz. I don't know if "Real Audio Frequency" in the .ioc "Pinout & Configuration" on SAI2 should match this number (6.144MHz) or the Audio Sampling Frequency (48kHz). I cannot get "Real Audio Frequency" to be exactly 6.144MHz. I don't know if this should be the frequency the the SAI2 Clock Mux outputs (SAI2 Clock Mux sources from PLLSA

Hi, I'm trying to get a few lines of text displayed on an OLED screen using 4-wire SPI on an STM32H755 board, but I haven't succeeded yet. I've looked into the sample code provided by the manufacturer (which is Arduino-based), but it hasn’t helped much so far. Has anyone worked with this display or with the SSD1322 controller before? I’m mainly looking for example code for the STM32 platform.I’ll be uploading my current progress to my GitHub repo.   Thanks in advance!

So I want to use a capture compare to measure an input frequency 0.1Hz to 100kHz. Peripheral clock is set to 32MHz to cover full range and maximise speed of calculations. At lower frequency I have to count the number of times the over capture call-back is called, to put into the calculation. However there are a few frequencies where the over capture and edge detection IRQs have a beating effect, I have delt with this on other processors by ensuring the order IRQs are delt with but it doesn't seem to be working here.Sometimes the last over capture is called first, other times in is not, leading to a large jump in my calculated result. As anyone any experience with this issue on the STM32 TIM peripherals?/****************************************************************************** Function : Calculate_Frequency Return : Frequency post calculation as a float *****************************************************************************/ #define TIMCLOCK 32000000.00 //System clock value

Hello,Sorry if it's a *** question but I don't understand something.I want to have an HID and MassStorage usb device. I've seen that ST add USE_USBD_COMPOSITE but I don't understand why we use it for USBD_ClassTypeDef.For me, we have 1 device desc + 1 config desc with 2 interfaces, it's not enough to have only 1 class (with init, setup, dataIn, dataOut, getHsDesc) and put 2 registerInterface in MX_USB_DEVICE_Init and an if(epnum == HidEp) else if(epnum == MscEp) in dataIn and dataOut ?I think I missing something.Thank you for your answer.

Hello,I am experiencing an issue with LwIP on the NUCLEO-F746ZH board. I am using STM32CubeIDE 1.14.0 with the STM32F7 firmware package v1.17.3 (I also tried v1.17.0 and the latest CubeIDE version, but the errors still persist).In the screenshots I shared, you can see my LWIP, ETH, FreeRTOS, and Cortex MPU settings. With these settings, I expect to be able to ping without adding any extra code, but unfortunately I encounter problems in the lwip_init function.This issue has been mentioned before in the forums: when I configure the MPU as suggested (example file attached), the first configASSERT hits a breakpoint. If I try without any MPU configuration, it stops at the second configASSERT (as shown in the screenshot).I tried many approaches but couldn’t solve it. Without RTOS, there is no problem and ping works fine, but with RTOS I face an issue related to semaphores. At this point, I am not sure what I am missing. I also attached my FreeRTOSConfig file.Interestingly, the LWIP_HTTP_Serv

This is a line of code i don't understand,  /* Force the TIMx prescaler with immediate access (gen update event) */ LL_TIM_SetPrescaler(TIMx, pHandle->HALLMaxRatio); LL_TIM_GenerateEvent_UPDATE(TIMx);The code is part of the __weak void HALL_Init(HALL_Handle_t *pHandle) functionwhen the second line of code is executed does it mean that i get the interrupt timer over flow interrupt immediately. Please clarify. The TIM4 is configured in XOR / Hall mode.

Hi everyone,I’m working on an STM32U3 project and ran into an issue where flash erase was failing with error code 0x00000080 on page erase, even though the option bytes and addresses appeared correct.After debugging, I found that explicitly setting the voltage scaling to PWR_REGULATOR_VOLTAGE_SCALE1 before flash erase resolved the issue. The working sequence I use is:  HAL_FLASH_Unlock(); HAL_StatusTypeDef status = HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE1); if(status != HAL_OK) { return status; } EraseInitStruct.TypeErase = FLASH_TYPEERASE_PAGES; EraseInitStruct.Banks = BankNumber; EraseInitStruct.Page = FirstPage; EraseInitStruct.NbPages = NbOfPages; if (HAL_FLASHEx_Erase(&EraseInitStruct, &PageError) != HAL_OK) { return status; }This step wasn’t required on my Nucleo board but was essential on my custom hardware.My questions now are:Is it safe and recommended to keep the voltage scaling at SCALE1 permanently after flash erase, or sh