STM32 MCUs Products

Please i need help. The datasheet, says the VDDA voltage level must be always greater or equal to the VDD voltage leveland must be provided first. My qustion is: will my circuit work, if I tie the VDDA and VDD together, to be powered by the same  LDO DC-DC converter?   Thanks in advance.

Hello,I am learning bare metal programming for STM32F446RE and am trying to write a simple transmit driver for USART2. I managed to do it but my only problem is when I use HSI 16Mhz clock speed (or anything lower) I get a weird first character. When I use a higher clock speed it works fine (using another clock source). Does anyone know the reason for that?Thank you void USART_init(){ RCC->APB1ENR|=(1<<17); USART2->CR1&=~(1<<12); USART2->CR1&=~(1<<10); USART2->CR1&=~(1<<15); USART2->CR1|=(1<<13); // Baud Rate of 115200 and Clock of 16Mhz USART2->BRR=(8<<4 | 11); USART2->CR1|=(1<<3); USART2->CR1|=(1<<2); char g[15]; sprintf(g,"Hello\r\n"); for(int i=0;i<strlen(g);i++){ while(!(USART2->SR & (1<<7))); USART2->DR=g[i]; } while(!(USART2->SR & (1<<6)));

Dear STM experts:     I am using the STM32G473RET6 chip for classic mode communication debugging in FDCAN, but there is a phenomenon where I cannot send information. In FDCAN-PSR, I can see an error of LEC being 5. After removing the CAN chip (SN65HVD230, R pin floating), an error of LECt being 2 appears. I am preparing to replace it with SN65HVD232,Is there any STM with similar routines to refer to? If so, where can I find it? Thanks. Best regards!

Hello guys,I have a stm32G474RET board. I am using tim1 in PWM input mode and i want to update on the fly the hrtimA period and compare values using DMA.  This is the code i have written: // Addresses for HRTIM registers (Timer A) destPER = (uint16_t*)&HRTIM1->sTimerxRegs[HRTIM_TIMERINDEX_TIMER_A].PERxR; destCMP = (uint16_t*)&HRTIM1->sTimerxRegs[HRTIM_TIMERINDEX_TIMER_A].CMP1xR; // Start DMA transfers in circular mode HAL_TIM_IC_Start_DMA(&htim1, TIM_CHANNEL_1, destPER, 1); HAL_TIM_IC_Start_DMA(&htim1, TIM_CHANNEL_2, destCMP, 1); HAL_HRTIM_WaveformOutputStart(&hhrtim1, HRTIM_OUTPUT_TA1); HAL_HRTIM_WaveformCounterStart(&hhrtim1, HRTIM_TIMERID_TIMER_A); HAL_TIM_IC_Start(&htim1, TIM_CHANNEL_1); HAL_TIM_IC_Start(&htim1, TIM_CHANNEL_2); My problem is that the period of the hrtim is changing dynamically based on the input PWM signal, but the CMP1 doe

We have a batch of custom boards using the STM32H725IGK3 and have experienced several failures getting started with them as the SWD interface appears to be fried. Initially we thought just bad luck with the first couple (inexperienced engineers or ?) but the most recent unit failed after a few successful programming and debugging sessions. Do these processors need special handling or design considerations ? Our debug header follows previous designs, with Vcc, GND, nRST, SWDIO, SWCLK provided. nRST is gated with a couple other inputs to the MCU while SWDIO and SWCLK just have 100R series resistors to protect possible voltage conflict. So far just default 3v3 supply.When the boards were working, SWDIO showed Vcc while SWCLK showed 0V before any connections (expected based on internal pullups) while now the pins show about 0.8V until the STLINK/V2 is connected (upon which its pullup/downs take over). The STLINK pod has been tested and working on a NUCLEO_

Testing a board with STM32U5A5. VDD is 3.3VI have configured one GPIO as input with an external pullup to 3.3V through a 470k ohm resistor.The input reads high, but when I measure the input with a scope, I read 2.2V on the input, which is below 0.7VDD which is guaranteed as V_IH, but above 0.5VDD+0.2 which is specified by design as V_IH.Is 470k ohm too high of a pullup resistance?

Hello ST Community teamThe pin F11 on the TFBGA216 figure (figure 4 of the AN4660) should be VDD and not VSS according to the products datasheets (for the STM32F469N and STM32F769Nx6). That should be rectified on the next doc revision. Best Regards.II

I am trying to apply this configuration to my STM32H757 MCU where I am making a development board. here few things confuses me. 1. I have selected this configuration for better efficiency + noise performance. guide me if I am wrong2. What is the VDD External it seems like another input other than VDD.

Hi Everybody1) There are some technical o specific reasons, that I was not able to find in the various documentations, to use external SMPS for VDDCORE insted of the internal one ?2) Working on NUCLEO-N675X0-Q, to configure various bridge for internal SMPS, documentation report to remove R103.But if this, VDDA1V8 is missing and board doesn't work.I remove and install all bridge as reported in the documentation (UM3417) , just I left R103 ON, only in this way the board work.RegardsDanilo 

Hi everyone! hope you can help me. I have an issue on the STM32H7A3ZIT6.I already used the BKPRAM on other project, like the STM32H753 and I had no issue, work perfectly.So I don't understand why it is not OK, here below is what I do to test the BKPRAM : (I work on IAR Workbench)__HAL_RCC_BKPRAM_CLK_ENABLE(); // unlock backup domain HAL_PWR_EnableBkUpAccess(); // enable the backup SRAM if (HAL_OK != HAL_PWREx_EnableBkUpReg()) { Error_Handler(); } /* I tried with MPU config enable and disable also, I tried also with Cache enable or Cache disable. same issue. */ //MPU_RegionConfig(); // Test read and write to backup SRAM uint32_t magicNumber = 0xAA55; uint32_t *pBackupSram = (uint32_t *)(0x38800000); //If I look at the value of the pBackupSram I can see on the watch "unavailable" so I know it will hard fault... // when I execute the line below I got an hardfault. *pBackupSram = magicNumber; if (magicNumb

Heyho,management asked me about a project involving 1 or 2 audio input channels at 32-bit / 200 kHz and  - here's my knowledge almost zero - some "heavy & intense" DSP / FFT algorithms for real-time signal evaluation.We're already using the H723 .. H735 family, so we have the hardware experience, but no idea about the DSP capabilities of these MCUs, and the numbers in e.g. AN4841 (CMSIS DSP) don't tell us too much - and probably also not our DSP software guys, who are working on PC only for 20 years now (which is kinda sad, when I started working, PCs and interfaces were so slow, that our hardware had lots of dedicated DSPs, so we also had the know-how).Due to size constraints, we will also probably be limited to the internal flash (I guess no problem), and it would be easier to live with the internal SRAM of about 500 kB.So, dear community, what's your experience with these H7s and its computational po

Hello everyone.How do I update the firmware via VCP on STM32F407VET6? Is it possible to do so? If so, what needs to be changed and added? Do I have to recreate the bootloader?I don't know where to start here.Thank you :)

Hi,I'm using an STM32H750XBH6 with an ISSI IS42S32400J-6BL, but the read/write operations keep failing.I’ve tried setting the CLK to 166 MHz / 120 MHz / 100 MHz / 50 MHz, but it still fails.When measuring with an oscilloscope, I found that the FMC_Dx pins of the STM32H750XBH6 show an extra waveform in addition to the normal data waveform during output.I disconnected the 22 Ω series resistors, but the same waveform can still be observed on the MCU’s FMC_Dx pins.Does anyone know what might be causing this? 

Hi everyone . I have timer problem again. I use STM32G431KBT6. I'm using timers. timer 3 for pwm pulse direction servo motor and timer 8 for pwm speed control dc motor. But when start timer8 pwm, timer 3 is starting same time. What could be the reason for this? My timers set: 

I have a question about PVD.I have this main.c file. My interrupt function void TM_PVD_Handler(uint8_t status) won't execute when the power goes off. Why? In this case, I'm sending a message to the UART to see if my computer recieves the message before the CPU dies due to the lack of power. Have I forgot something? According to this example below, it's made for STM32F7, STM32F4 and STM32F0 series. I think this will work for STM32F1 as well. Correct me if I'm wrong.I'm using STM32F1 series. /* 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 c

PART NO: STM32H743IIT6CUBE_IDE VER: 1.19.0SDK : STM32Cube FW_H7 V1.12.1LSE PART NO. : CM9V-T1A-32.768kHz-12.5pF-20PPM-TA-QCHello everyone,I am trying to use RTC on mentioned STM part number. I have enable LSE and configured the RTC.Currently i am not using any battery, i am using a power supply with 3V to VBAT.After boot up inside HAL_RCC_OscConfig, i am getting timeout while checkin

Hi everybody,I've two cards with a STM32F446 on them.My first one works very well, the µc starts a each time.On the second card, the µc starts sometimes (I have a LED on my card that blinks at start).I've checked Vcap (2.2µF), the 3V3 rising (1ms), boot is well connected to GND with a 10k resistor.I cannot see what happens in debug mode, because in debug mode , it starts everytime.Is there a mean to check something else ?I don't understand what happens.If you have some ideas...Thank you. 

Hello STM32 community,I’m working on a project where I need to temporarily disable/enable the watchdog before entering into low-power/sleep modes, but I want to avoid resetting the MCU.Here’s the context:I’m using an STM32U385 MCUI know that watchdog configuration can be changed via option bytes, but changes only take effect after a reset.In my scenario, performing a reset is not acceptable because I need the MCU to resume execution seamlessly after sleep.Problem:The Independent Watchdog (IWDG) starts automatically once configured and cannot be stopped at runtime.I want to enter sleep modes (like Stop or Standby) without being reset by the watchdog, but also in some scenarios watchdog needs to be run in

Hello Team,I want to store encryption Key - 4 byte into Option Byte OR any other memory Except in-built Flash Memory.Is it possible to write in Option Memory ? If not what could be the other option ? 

I was configuring USB as virtual com port for stm32f401ccu6 (Black Pill) using HAL. I am getting clock issues. I tried multiple times but can't resolve them. please help me.  

Message:I have configured PA11 and PA12 pins in input mode, but they are not responding — I’m continuously getting a low level from the MCU side.For testing purposes, I configured the same pins as output, and they work fine in output mode.To verify hardware, I removed the MCU and checked the lines — they remain high, confirming that the hardware is OK.Please suggest the possible reason or solution at the earliest. 

I tried to download library from https://www.st.com.cn/zh/embedded-software/stsw-stm32054.html several times but failed.When I clicked download v3.5.0, nothing happened. By the way, we network is fine. Is it forbiden to download this version?

This is a question related to SPI communication.What is NSSP mode? What does it do?Also is there any documentation that explains all parameters in detail other than this

I'm trying to use 2 timers (TIM1, TIM8) in sync.Everything works OK when using same value for both timers' ARR.But drift occurs when using two different values as ARR (i.g. 3999 for TIM1 & 19999 for TIM8).What could be causing this drift? tim.c/* TIM1 init function */ void MX_TIM1_Init(void) { /* USER CODE BEGIN TIM1_Init 0 */ /* USER CODE END TIM1_Init 0 */ LL_TIM_InitTypeDef TIM_InitStruct = {0}; LL_TIM_OC_InitTypeDef TIM_OC_InitStruct = {0}; LL_TIM_BDTR_InitTypeDef TIM_BDTRInitStruct = {0}; /* Peripheral clock enable */ LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_TIM1); /* TIM1 interrupt Init */ NVIC_SetPriority(TIM1_UP_IRQn, NVIC_EncodePriority(NVIC_GetPriorityGrouping(),0, 0)); NVIC_EnableIRQ(TIM1_UP_IRQn); /* USER CODE BEGIN TIM1_Init 1 */ /* USER CODE END TIM1_Init 1 */ TIM_InitStruct.Prescaler = 0; TIM_InitStruct.CounterMode = LL_TIM_COUNTERMODE_UP; TIM_InitSt

I'm trying to start a timer when input GPIO becomes high (on its rising edge), at the same time i want to pull another GPIO to low. This is time critical.I'm using an external adc which will output a ready signal, at that time i want to pull CS pin to low and wait for a delay (tREAD), at the end of timer , want to pull the CS back high. Which is the best way to do, as i need the least latency.I'm using Nucleo H723ZG