STM32 MCUs Embedded software

Hello community,I'm facing a UART communication issue with my STM32F042K6T6 board and would appreciate any insights. Here are the details:Hardware Setup:MCU: STM32F042K6T6Peripheral: STPM3x Energy Metering ICConnection: 9600 baud, 8N1, no flow controlVoltage levels: 3.3V on both sidesThe Problem:My STM32 fails to properly receive data from the STPM3xHowever, when I check with a logic analyzer, I can see the STPM3x is transmitting valid data packetsThe STM32 misses packets entirely even max delay provided.Tried interfacing ESP32 → STPM3x works very fine.What I've Verified:Signal Integrity:Clean waveforms visible on logic analyzerProper baud rate (9600) confirmedCorrect parity and stop bitsBasic Tests:Loopback test (TX→RX) also not working properly as only the first byte is received others omitted.Different baud rates yield same issueTried multiple GPIO pins NOTE : The stpm3x.h & stpm3x.c library is ported manually from CPP. I also attached the original CPP files for the referen

Hi!I've been trying to insert FatFs in my IAR proyect for using a uSD for a while but it doesn't work.I tried by downloading FatFs from the Internet, but also creating a STM32Cube project for another board and putting it on mine, but when I rebuild all, there are many errors.I don't know if I have to activate something that I'm not minding or if there is something in those scripts I need to change before it compile. Could you please help me?

Hello,do you plan to release newer version of Eclipse ThreadX X-Cube packages?We are using x-cube-azrtos-f7 1.1.0 which contains ThreadX V6.1.10 which is outdated and insecure.Even remote code execution is possible: https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-m2rx-243p-9w64 and eclipse foundation only provides security support for ThreadX v6.4.x.SincerelyMo

I want to display "Hello, world" on the onboard screen of my STM32F429I-discovery board. Searching around the internet showed that the BSP has a library called "stm32f429i_discovery_lcd.h" that suits this purpose. Simply including the library with#include "stm32f429i_discovery_lcd.h"yielded build errors, because the compiler could not find the library file. In addition, even after adding the file location to my project's include path, I got warnings stating that "static SDRAM_HandleTypeDef SdramHandle" is not defined, which suggested to me that some associated source files might not be included in the build.After a long time I finally just decided to include the BSP/Components directory and the BSP/STM32F429I-Discovery directory to my project, add the include paths, and add the two folders to the source location.With this code, I had hoped that the screen would turn red, but unfortunately, it does literally nothing:#include "main.h" /* Private includes ---------------------------

hi ,i enable tamper4 and RTC in stm32mx and only enable bit RTC_CR_TAMPTS, TSE=0no other code add into rtc.c or tamper.c Using  debug mode to clear TSF and CTAMP4F.when push button will happen hard fault.  Only two code  in main while loop "led" and "hal_delay", if i remove HAL_Delay , will not happen . someone can help me?HAL_Delay(1000);HAL_GPIO_TogglePin(GPIOA,GPIO_PIN_11);

 Hello,I am utilizing the following components:Nucleo-H723ZH (STM32H723)eMMC: 4GBI have already created the following files:user_discio.cuser_discio.heMMC_Driver.ceMMC_Driver.hAfter connecting an SD card reader to the CN8 connector on the Nucleo STM32H723 board and using an eMMC card reader, the FATFs system is reporting that the eMMC is not ready. I am encountering problems when performing operations like f_mkfs or f_mount, receiving a "Not ready" error. Despite numerous checks of the configurations and parameters, I have not been able to resolve this issue.    

I am currently trying to use the LCD screen of the STM32N6570DK development board. But when I integrate the relevant information from the official firmware package into my project and try to use CUBEIDE for DEBUG, an error message will appear like this:But this problem doesn't always arise, and for such a main function：When I ran the "UTIL_LCD_SetFuncDriver() "function, the LCD backlight screen seemed to have some reaction, but it couldn't perform the setbackcolorr or clear functions properly. My screen remained dark.Is it because my configuration is incompatible with the relevant BSP firmware library, as the corresponding CUBEMX configuration is not provided in the firmware package? These are all my files, I have tried my best to make everything in order but in vain: 

I have tried the BSP example from the STM32CubeN6 package, and the LCD works correctly. However, I am trying to create the smallest possible code to make the screen work, and I started a project from scratch using STM32CubeMX and STM32CubeIDE.What I did was to enable the minimum amount of peripherals to make LCD work in CubeMX, and the code generator added the necessary HAL files, etc..Then I added the discovery_lcd BSP for this board among other needed files like stm32_lcd and the fonts...The code compiles, and the LED1 and LED2 blink as part of the while loop I coded.However, the LCD is blank (but I can see that is active because the backlight is on). I am expecting to see a white background with some text.You can find my code here: https://github.com/jpcano/STM32N6-digits/tree/lcd Do you have any ideas? 

Hey , New to STM32 HereI was learning about the different DMA modes, and I came across a study case that compares the time taken by each mode in a DMA memory-to-memory transfer (from Flash to SRAM). Here's the comparison below:I'm using a Nucleo-F401, and I wrote a simple code to measure the transfer time using a timer, like this:I was surprised that the results were not as expected — for example, DMA MEM2MEM transfers with word alignment took longer than those with byte alignment. Can someone please explain because this is so confusing 

Hi. I have a board with STM32G0 that I want to wake up from STOP mode via external signals. And so I used 16 interrupts from GPIO and they work correctly. However, I need one more external input for waking up. Specifically, I have a PA15 pin that has an external pull-up, and the signal that is supposed to wake up pulls this pin to GND. PA15 has AF: TIM2_CH1 and TIM2_ETR. I tried to use ETR, but I don't have the option to select the edge and I don't know why CubeIDE sets this pin as push-pull. Generally, I tried several modes/configs and none of them wakes up the processor, or even jumps to the interrupt from TIM2. Can you suggest something? Example? Tutorial? Because when I search for similar threads, I still come across cyclic timer wake-up every x seconds, and I need to wake up the timer the same way as with EXTI. If its impossible, i eventually can change pin and use UART to wake up (if it will work :)), but i think it should be possible using timer. Thanks in advance.

Hello Team,I have configured the lwip middleware but unable to ping with my laptop and when I connect ethernet cable from laptop to the stm32f769 controller I  am getting pbuf error (Assertion "pbuf_free: p->ref > 0").Is there any need to configure MPU, if so also please let me know how to select base address..please find the attached screenshots.could you please help me in configuration when freertos is enabled. Thanksvamshi kumar   

Hi all, I had created an example project Tx_Thread_Creation for NUCLEO-F767ZI board and enabled Threadx.I had also enabled the USART 2 peripheral and also enabled the USART driver under HAL Drivers under the software packages, but the USART Driver files are not added to the "Drivers/STM32F7xx_HAL_Driver/" folder. Attached the project for your reference as a zip file.Please check it once and let me know how to fix the issue. Thanks,

Hi,I don't understand the behavior of EOC bit of ADC_ISR register at the end of conversion process.My micro code is STM32H563VGT6.I start from example "ADC_SingleConversion_TriggerSW_Init".As the example I have to convert a single channel, single conversion mode.This the problem:after I start the conversion, the bit EOC and EOS go high togheter. But EOC then goes low, with no reset by software and any read of the register ADC_DR.The DMA is not active.Then when I loop with this condition:while ( ! LL_ADC_IsActiveFlag_EOC() )I stuck in the loop.Why this behavior?Thank you.

Hi,I'm using STM32H755 nucleo board. I'm having freertos + LWIP on M7 core and bare metal on M4. I'm using TCP command to start some real time test on core M4. I'm using shared memory to trigger test and also transmitting some data back to M7 core. I'm having occasional problem. I am getting hardfault on M7 core. I'm looking fault analyzer with following results:I'm not sure how I can find root cause for the problem? It seems that something goes wrong with tcpip_thread. 

I am working on a project with a STM32H573, using the external tamper lines. CubeMX version 6.14.1.For configuring certain IN/OUT pins for the TAMP peripheral, RM0481 says that bits in the TAMP_OR register must be set:However, these bits are not set correctly in the initialisation code. Indeed, it seems that there is no mechanism in any functions in stm32h5xx_hal_rtc_ex.c to set TAMP->OR, and no relevant flags in RTC_ATampInputTypeDef or RTC_ActiveTampersTypeDef.There is obviously an easy workaround of setting the bits manually at initialisation.

Split from What RTOS is used on STM32F429i eval board GUI Demo?Thank you !I have saved the github page. Will try the examples there.Does the STM32429I eval board come with FreeRTOS installed ?

On nucleo_u575zi_q below observations has been captured.Issue: - when IWDGRSTF flag is cleared by writing to the RMVF bit still watchdog reset occurred.Expected Behavior: - When the IWDGRSTF flag is cleared by writing to the RMVF bit, the watchdog reset should not occur.Please find the below snippet of sample code of STM32cubeIDE.Also find the reference of user Manul and data sheet of nucleo_u575zi_q board.Please provide appropriate solution for the above issue.

/* 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 is provided AS-IS. * ****************************************************************************** */ /* USER CODE END Header */ /* Includes ------------------------------------------------------------------*/ #include "main.h" /* Private includes ----------------------------------------------------------*/ /* USER CODE BEGIN Includes */ #include <stdio.h> #include <string.h> #include "time.h" /* USER CODE END Includes */ /* Private typedef ---------------------------

Hello everyone, I’ve encountered some strange behaviour with my PCB using an STM32H563VGI MCU. The setup includes an array of 10 LEDs, where one additional LED turns on every 2 minutes. Initially, the system worked fine, but after about 10 minutes, I noticed the LED sequence stopped progressing, it got stuck at LED 2. To investigate, I connected a SEGGER J-Link debugger. Surprisingly, as soon as it was connected, the system resumed normal operation: the MCU printed all messages correctly, and the LED array advanced to LED 5, which was the expected state at that moment. It’s as if simply connecting the debugger “unstuck” the MCU. I’m using ThreadX as the RTOS. Has anyone experienced similar behavior? Any ideas what could be causing this? Thanks in advance for your help!

Dear ST Community, Dear ST Team.To implement a small USB Device i working with STM32F412 MCU and a Flash Chip mt25ql512.The Good Part is, that the QSPI Communication works absolutly fine and i can read, write the flash and erase the Chip.Next Step is to Implement a small Filesystem with FATFS.After the Standard settings and configure the user_diskio.c, i stuck in the HardFault_Handler after the call f_mkfs() function. So im sitting on a dead end and im glad to hear some ideas or information about that topic.Thanks for your help.Thx RSheetz/********************************************************************************************/void FatFS_USB_init(void){// FATFS_LinkDriver(&Flash_Driver, USERPath);FRESULT res = f_mount(&USERFatFS, USERPath, 1);// If FatFS fails mounting process, create new file systemif (res != FR_OK){f_mkfs(USERPath, FM_FAT32, 0, workBuffer, sizeof(workBuffer));res = f_mount(&USERFatFS, USERPath, 1);}}/***************************************************

Dear ST Experts,I hope this message finds you well.My current requirement is to implement Azure IoT Middleware for FreeRTOS on an STM32F2 series board. As I am relatively new to IoT development, I would appreciate your guidance and support in getting started.I have a few specific questions:Compatibility: Does the STM32F2 series support Azure IoT Middleware for FreeRTOS?Configuration: If supported, what are the key parameters or middleware components that need to be enabled in STM32CubeMX or CubeIDE?Documentation Gaps: I have reviewed the available Azure and ST documentation, but I couldn’t find specific guidance or porting examples for the STM32F2 series. Could you please point me to any relevant resources or examples?Your assistance would be extremely helpful for my development efforts.Thank you for your time and support.Best regards,Amara Rakesh 

Hi all.I am using printf() in my USB-CDC VCP based stm32cubeide project, for printing the messages via USB to the serial terminal. But it prints only once in CDC_ReceiveCallBack () function and then i do not see other messages printed. In fact in while loop (in main function), i get all printf function results (all messages getting printed on serial terminal).Moreover, I tried to use flush function - fflush(stdout)  after printf() function, but the result is the same..May be i did not use it properly.?Can anyone please help me out for this. ?Many thanks in advance,

I am setting up my first m55 STM32 project using the NUCLEO-N657X0 dev board with the CMSIS DSP libraries. I have copied the CMSIS DSP libraries into my project and I have added the CMSIS-DSP include paths into my project, but I am receiving the following build error message, arm_vec_fft.h: error: incompatible types when assigning to type 'uint32x4_t' from type 'int32x4_t'Can you please provide a recommendation to resolve this error? Thank you.   

@Tesla DeLorean @Amel NASRI @Andrew Neil    Hi! I am starting to implement RTOS in my program, and I wonder if someone could help me to figure out what is happening with my MCU routine.  I am starting my program with baby steps. I initiated four threads that I intend to use (Main - UART - LCD - ADC). At first the code worked just fine and suddenly stopped working. The way the MCU is behaving seems to vary and is giving me a hard time to understand why. My threads are the following:   void mainFunction(void *argument) { /* USER CODE BEGIN 5 */ /* Infinite loop */ for(;;) { char msg8[100]; sprintf(msg8,"Main Function ###### MAIN #####\n"); HAL_UART_Transmit(&huart8, (uint8_t *)msg8, strlen(msg8), 1000); osDelay(500); } /* USER CODE END 5 */ }void uartFunction(void *argument) { /* USER CODE BEGIN uartFunction */ /* Infinite loop */ for(;;) { char msg8[100]; sprintf(msg8,"Uart Function ###### UART #####\n"); HAL_UART_Transmit(&huart8,

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