STM32 MCUs Embedded software

    Hi. I am currently using the stm32u545ret6q mcu.   Looking at the RCC of reference documentation(RM0456) it says that it has MSIS hardware autocalibration, but the example code(AN5676) only shows how to adjust the trimming value.   Do you have any example code that shows how to do hardware auto-calibration?    

Hello,I'm working on a project using the STM32H750B-DK board with TouchGFX and FreeRTOS. The application gets stuck in this loop:while ((HAL_GetTick() - tickstart) < Delay) {}I debugged and confirmed that HAL_GetTick() is not incrementing

I have a STM32L432 Nucleo-32 board and I'm trying to use ITM printf trace. I created new project with configuration: "Targeted Project type: Empty" "targeted language: C++". I'm not using HAL libraries.In the syscalls.c I added following code://Debug Exception and Monitor Control Register base address #define DEMCR *((volatile uint32_t*) 0xE000EDFCU ) /* ITM register addresses */ #define ITM_STIMULUS_PORT0 *((volatile uint32_t*) 0xE0000000 ) #define ITM_TRACE_EN *((volatile uint32_t*) 0xE0000E00 ) void ITM_SendChar(uint8_t ch) { //Enable TRCENA DEMCR |= ( 1 << 24); //enable stimulus port 0 ITM_TRACE_EN |= ( 1 << 0); // read FIFO status in bit [0]: while(!(ITM_STIMULUS_PORT0 & 1)); //Write to ITM stimulus port0 ITM_STIMULUS_PORT0 = ch; } __attribute__((weak)) int _write(int file, char *ptr, int len) { (void)file; int DataIdx; for (DataIdx = 0; DataIdx < len; DataIdx++) { ITM_SendChar(*ptr++); } return len; }I didn't make any changes t

Hello everyone,I am currently working on a project using an STM32H755ZIT6 MCU and want to use the USB CDC class to send data over USB. I can successfully program the MCU and the system clock configuration is correct. However, when I plug in the USB, the device is not recognized by Windows. I receive the following error message:"Unknown USB Device (Device Descriptor Request Failed)""The last USB device you connected to this computer malfunctioned, and Windows does not recognize it."Schematic details:I have attached the schematic of the USB circuit to this post.USB_DP is connected to PA12.USB_DN is connected to PA11.The circuit is powered via USB as well.Currently, only R45 and R50 are mounted (0 Ohm), R47 and R49 are not mounted.The TS3USB30EDGSR chip is not activated at this stage. I have the option to activate it if needed.To make sure the MCU has enough time after power-up, I added a 3-second delay before initializing the USB stack.Still, the USB device is not recognized.If anyo

I'm having difficulties in approaching GPDMA in H5 architecture. In another thread I'm trying to run a DMA, which keeps going itself (circularly?).Does that mean inherently that always a linked list has to be used?And would uneviteably go along with an interrupt being generated?If the buffer length is 1 (in my case), that would be very costly and would foil the benefit of DMA.Where can I find a good source for reading on (tutorial, examples)? 

Recently I’ve been developing a host application on a Mac Mini (Apple M4, Sequoia 15.5) using Xcode. It communicates with a STM32H7 board via USB CDC, using the internal PHY at 12 Mbps. The USB CDC code is auto-generated by CubeMX with all default parameters. The board works perfectly with serial tools on Windows.When the same board is connected to the Mac Mini, it successfully enumerates two devices: /dev/tty.usbmodem and /dev/cu.usbmodem. Regardless of which one selected to communicate, writing always succeeds and the board receives the data correctly and sends respond back.However, for some reason, the Mac computer “drops” the incoming data—the application’s read() function never gets anything.I’ve already tried the following combinations:Reading and writing from tty or cu deviceBlocking and non-blocking reads (including background event-listening methods)Enabling DTR and/or RTSUsing third-party libraries like ORSSerialPortNone of them worked. Also tried some serial tools on Ma

Hi, I assume there have already been posts on this topic, but I can't handle this problem. I have an STM32F429I-DISC1 board and I'm trying to connect it as a USB HID keyboard. Unfortunately, all the guides and articles don't work, and my board isn't even detected by the computer after uploading the program. Why? Has anyone else had this problem and would like to share a solution?

Hi, I'm working on STM32H7A3NIH6Firmware Package: STM32Cube FW_H7 V1.11.2 I have a very interesting issue with bootloader jumping.According to the file "an2606-stm32-microcontroller-system-memory-boot-mode-stmicroelectronics", the bootloader address is 0x1FF0A000. The issue: Sometime its works (succeed to jump into the bootloader, and succeed to program by STM32CubeProgrammer), and sometime is not. After investigation, I found that when it is not works, it is because the jumping function stuck in HAL function named SCB_DisableDCache().In SCB_DisableDCache(), there is a while loop that reduce a variable named "sets", and when it came to be zero, the loop is done, and the jumping is continue.The variable "sets" value starting with some value, 127 for example, and sometime without any reason it changed to a non-reasonable number (605028303), and the loop is continued and continued. SCB_DisableDCache() is a pure HAL function.  I'm using thi

I have an STM32H735 Discovery Kit and am running the example LWIP code from STM32H7-LwIP-Examples/STM32H735_Disco_ETH. This works great. But, when I add MDNS, I get a very curious crash.I enabled MDNS in CubeMX, and then created a new thread to wait for an address to be assigned by DHCP before initializing MDNS:void mdns_thread(void *argument) { mdns_resp_init(); while(!dhcp_supplied_address(&gnetif)) { vTaskDelay(1000/ portTICK_PERIOD_MS); } LOCK_TCPIP_CORE(); mdns_resp_add_netif(&gnetif, "scion", 60); /* mdns_resp_add_service(&gnetif, "_scion", "_scion", DNSSD_PROTO_UDP, 9000, 3600, srv_txt, NULL); mdns_resp_announce(&gnetif); */ UNLOCK_TCPIP_CORE(); while (1) { vTaskDelay(500/ portTICK_PERIOD_MS); } } With the thread created as: osThreadAttr_t attributes; memset(&attributes, 0x0, sizeof(osThreadAttr_t)); attributes.name = "MDNS"; attributes.stack_size = 512; attributes.priority = osPriorityNormal; osThreadNew(mdns_thread, &gnet

HiI'm having troubles programming the stm32h755zit6 on my selfmade PCB. The schematics should be right, as i am able to programm the STM32. But if i run a simple code inwhich a certain pin should be pulled up high, it just won't work. Therefore I thought about debugging the code to see whether it reaches the part inwhich the GPIO-function is called. But instead it doesnt and ends up in a error_handler. Afterwards i somehow am not able to reprogramm the STM32H755 anymore as the message following message appears:stmicroelectronics st-link gdb server. version 7.10.0 copyright (c) 2025, stmicroelectronics. all rights reserved. starting server with the following options: persistent mode : disabled logging level : 1 listen port number : 61234 status refresh delay : 15s verbose mode : disabled swd debug : enabled initwhile : enabled target no device found error in initializing st-link device. reason: no device found on target.I have no done this over and over again three time an i always had

Problem DescriptionI am having some trouble using HAL_UART_Receive_IT() to receive UART data in interrupt mode, the callback HAL_UART_RxCpltCallback() only triggers once for the first byte, subsequent bytes do not trigger the interrupt. I don't know if there is some problem with my implementation or if the problem is in STM32CubeH5 (v1.5.0). I would really appreciate some help!SymptomsHAL_UART_RxCpltCallback() executes correctly for the first received byte.Calling HAL_UART_Receive_IT() again does not fix the issue.No further interrupts are generated, even though UART data is arriving.Root Cause?I did some digging and found the UART interrupt handler (UART_RxISR_8BIT) clears the RxISR function pointer (huart->RxISR = NULL) after processing the first byte. This prevents the interrupt from being handled correctly again, even if HAL_UART_Receive_IT() is called again.Workaround: Manually Restore huart->RxISRTo workaround this, I added one line to manually reassign huart->

I am trying to switch the USB to DisplayPort mode via the PD (Power Delivery) line. I have a custom board based on the STM32G0B1CBT6, and another board based on the RTD2556, which works well for switching. I am sniffing PD communication using the LA1016 logic analyzer, and I have successfully been able to repeat all responses connected to perform the switching mode, except for sending SOP from the device to the host. All the necessary logic is implemented in the usbpd_vdm_user.c file, in the callbacks function. In the main thread, I have osDelay(2000); /* Update DP Status first */ sDP_Status[0].d.HPDState = 1; // Set HPD state sDP_Status[0].d.Enable = 1; // Set enabled /* Request attention - this will trigger message send */ USBPD_DPM_RequestDisplayPortStatus(0, USBPD_SOPTYPE_SOP, 0xFF01U, &sDP_Status[0].d32);But nothing in the log happining. Like it whaiting for something.  I'm tring to send2.5380323000,Preamble2.5382400500,SOP,,2.5383050000,Header,0x2E8F,DataObject

Hello!I am using STM32F427VIT6 and OV5640 camera to stream MJPEG to a webserver. I used DCMI DMA to get a jpeg_frame, size around 10KB to 25KB per image, with almost 30FPS and send it to jpeg buffer in CCMRAM like this.__attribute__((section(".ccmram"))) __attribute__((aligned(32))) uint8_t jpeg[32768]; __attribute__((section(".ccmram"))) __attribute__((aligned(32))) uint32_t jpegLength = 0; Then I used LwIP with raw TCP, tcp_write() function to send it to webserver but it's very laggy, sometimes return ERR_MEM in this functionLWIP_DEBUGF(TCP_OUTPUT_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("tcp_write : could not allocate memory for pbuf copy size %"U16_F"\n", seglen)); goto memerr;Although I spent nearly 100% of my RAM allocating for LwIP heap memory and SND buffer. Here is my LwIP mem config/*----- Default Value for MEMP_NUM_TCP_PCB: 5 ---*/ #define MEMP_NUM_TCP_PCB 1 /*----- Value in opt.h for NO_SYS: 0 -----*/ #define NO_SYS 1 /*----- Value in opt.h for SYS_LIGHTWEIGHT_PROT: 1 -----*/

Hi,I'm using the STM32H743, with TLV320AIC3254 audio codec to send and receive audio using the SAI peripheral in I2S mode, 16 bits (extended mode, i.e 32 bit slot), master, stereo.I'm using DMA to send/receive the data, but have come across an issue where the data transmitted by the SAI seems to have the left and right data swapped. As I understand, the even samples in my buffer should be for the left channel, and the odd samples for the  right channel.As a test, I have written specific values (0x0033 , 0x0088)  to the first to the first two int_16 of the output buffer. And I expect to see the first sample output with FS low, then then next with FS high. However checking the data output with a logic analyzer, shows that  1. There is an initial sample that is 0, which is not in the output buffer. 2. The left and right data are swapped.I've tried changing the FS polarity, which will fix the transmitted samples, but then the received samples are swapped.I guess it could be

Hello everyone,I am looking for a solution for a CustomHID device on a STM32C071.I would like to implement a CustomHID device, with TreadX and USBX.Unfortunately I can only find examples for mice in the templates. It is a bit difficult to deduce a CustomHID from these.The tutorials I have looked at so far have not helped me either.I already have experience with the “old” USB_Device library (also CustomHID) from STM in conjunction with FreeRTOS.On the STM32C071 I already got TreadX to work, but when I try to implement CustomHID, nothing works anymore.Unfortunately I can't find any information on what to look out for when implementing a CustomHID on an STM.Does anyone have any idea where I can find information on this problem?A tutorial would be great, but I haven't found one yet.Greetings Greg

Hello,I am just trying to compile the example project GPIO_IOToogle_FSBL by using the STM32CubeIDE and firmware with its patch STM32Cube_FW_N6_V1.1.0.zip (i.e., en.stm32cuben6-v1-1-1 (patch).zip) and after following the instructions per "UM3249 - User Manual - Getting started with STM32CubeN6 for STM32N6 series" when I attempt to compile I started getting these errors: 08:42:09 **** Incremental Build of configuration Debug for project GPIO_IOToggle_FSBL ****make -j16 allarm-none-eabi-gcc "D:/ST/SW/STM32Cube_FW_N6_V1.1.0/Drivers/STM32N6xx_HAL_Driver/Src/stm32n6xx_hal.c" -std=gnu11 -g3 -DDEBUG -DUSE_HAL_DRIVER -DSTM32N657xx -c -I../../../FSBL/Inc -I../../../../../../../../Drivers/STM32N6xx_HAL_Driver/Inc -I../../../../../../../../Drivers/CMSIS/Device/ST/STM32N6xx/Include -I../../../../../../../../Drivers/STM32N6xx_HAL_Driver/Inc/Legacy -I../../../../../../../../Drivers/CMSIS/Include -O0 -ffunction-sections -fdata-sections -Wall -fstack-usage -mcmse -MMD -MP

Greetings, I am using a Discovery Kit (B-U585I-IOT02A) and I want to use the LPTIM1 to wait 5 seconds (counting x ticks), at the end of the 5 seconds enter in a Callback to do something and then restart the counter again.I want to use as clock source the 32.768Khz crystal (LSE). So, I configured the LSE clock in the RCC section of the .ioc, then I set the LSE as clock source for LPTIM1, and activated the interrupts. At the main function, I used the HAL_LPTIM_TimeOut_Start_IT(&hlptim1, 16383) and used the void HAL_LPTIM_AutoReloadMatchCallback (LPTIM_HandleTypeDef* hlptim) callback to do something. The callback is not being called, I measured the signal at the crystal, and I can't see any clock in it. I guess something's missing in the configuration but I have no clue what it is and I can't make it work. An helping hand would be appreciated.

We are using the STM32U575RIT6 device and performed a RX/TX swap on LPUART1, ports PC0 and PC1. When we enabled the Swap TX is properly transmitting out of PC0. But we are unable to read anything on the new RX pin PC1. Other than enabling the pin swapping what else would need to be changed? Are there any known issues with the SM32u5 pin swapping? 

Hello colleagues,Hope you may help me in one issue I'm facing w/. What I have in hands:STM32F407 discovery kitWaveShare LAN8720 ETH board is connected to discoverySTM32CubeIDE. Version: 1.18.1. Build: 24813_20250409_2138 (UTC) Simple LWIP projectint main(void) { /* USER CODE BEGIN 1 */ /* USER CODE END 1 */ /* MCU Configuration--------------------------------------------------------*/ /* Reset of all peripherals, Initializes the Flash interface and the Systick. */ HAL_Init(); /* USER CODE BEGIN Init */ /* USER CODE END Init */ /* Configure the system clock */ SystemClock_Config(); /* USER CODE BEGIN SysInit */ /* USER CODE END SysInit */ /* Initialize all configured peripherals */ MX_GPIO_Init(); MX_LWIP_Init(); MX_RTC_Init(); MX_USB_DEVICE_Init(); MX_CAN1_Init(); MX_SPI2_Init(); MX_I2C1_Init(); MX_SDIO_SD_Init(); MX_USART6_UART_Init(); MX_USART1_UART_Init(); MX_USART2_UART_Init(); MX_USART3_UART_Init(); MX_DAC_Init(); MX_FATFS_Init(); /* USER

Hello,With freertos cmsis_os2 osTimerStop() returns osErrorResource despite timer is running and trigs the callback after the correct time.Is there a known bug?How a timer returning pdFALSE at test xTimerIsTimerActive (hTimer) can trig a callback???How can I stop the timer otherwise?Best regardsMich

Good Day,Recently I started working with a new MCU (STM32L152). I ported some UART code to handle received data from a different MCU, which worked fine. But as soon as I started testing edge cases I saw some weird things happen. I am using the DMA on the receive, and I rely on the Idle interrupt to send data to a different buffer for processing. It seemed like the Idle interrupt would trigger correctly for the following:- data length < half buffer length- data length = half buffer length- half buffer length < data length < full buffer length-  full buffer length < data length But it does not trigger for:- data length = full buffer lengthIt turns out in HAL_UART_IRQHandler (in stm32l1xx_hal_uart.c) there is a missing piece of code that enables this to happen. This code existed in the previous MCU's UART driver. I checked that I had the newest library downloaded for STM32L152. The piece of missing code is attached. /* * NOTE: This else was manually put in to f

Hi,I am implementing RS-485 communication on the STM32G491. Based on available references, I’m currently using a custom GPIO pin for the DE (Driver Enable) signal, since the default USART1_DE pin is already allocated for another function. In the RS-485 initialization API, there are three parameters: DE polarity, assertion time, and de-assertion time. Do these parameters have any effect when a regular GPIO is used instead of the hardware-controlled DE pin?I am using the below configuration for init.huart1.Instance = USART1; huart1.Init.BaudRate = 115200; huart1.Init.WordLength = UART_WORDLENGTH_8B; huart1.Init.StopBits = UART_STOPBITS_1; huart1.Init.Parity = UART_PARITY_NONE; huart1.Init.Mode = UART_MODE_TX_RX; huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE; huart1.Init.OverSampling = UART_OVERSAMPLING_16; huart1.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE; huart1.Init.ClockPrescaler = UART_PRESCALER_DIV1; huart1.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_MSBFIRST_INIT; huart1.Adv

Two of my MCUs are halting in same problem after running for about a year. There have not been many writes/cycles as I have a erase cycle counter which shows 27 so its not wear out problem. The EE_Init function gets stuck at step 4 and returns with  EE_WRITE_ERROR. Here is the page situation. I use page 2 and 3 of second bank. Page 2 is in state RECEIVE (aaaa, ffff, ffff, ffff), the page is otherwise empty. Page 3 is in state ERASING (aaaa, aaaa, ffff, aaaa) and the page is full with data. The problem is already found in step 3 (pagestate = STATE_CORRUPTED),  where it checks that page 2 is RECEIVE but page 3 is not ERASED. The code however does not do anything about it. It only deals with the case if (pagestate = STATE_RELIABLE). Recovery transfer occurs in step 3 only for reliable page state . Therfore in step 4, there is no active page, no valid page and finally the function exits with EE_WRITE_ERRORHere are the contents of page 2 starting at 0x08041000:Here are the co

Our product requires FIPS certification, and the chip is stm32u595. I found that the stm32 cortex-m33 core already has a library certified by the CAVP algorithm, but the version of the STM32CubeExpansion_Crypto-V4.2.0 library does not match the certified version. Where can I download the certified version 4.0.0 build1 ?Because the client and FIPS certification require code review, can you provide the source code?   Cryptographic Algorithm Validation Program | CSRC Data brief - X-CUBE-CRYPTOLIB - STM32 cryptographic library software expansion for STM32Cube  

I want to write data to an external flash (w25q128 with SPI) by sending a hex file from a PC to the STM32 over UART using tools such as Realterm or a python scriptI have seen examples using the external loader with STM32CubeProgrammer, but I want to avoid doing it this way and just use UART. The reason being is that for production I want the user to be able to simply flash new data without the need for ST programming hardware and software tools. Are the any examples or can anyone help me achieve this ?I am using the NUCLEO-L433RC-P board with the w25qxx driver....https://stm32world.com/wiki/STM32_W25Qxx