STM32 MCUs Products

Hello,I have a H7 design with multiple UART/USART used to communicate via RS485 drivers (XR3072).I have programmed kind of loopback test by connecting the A/B signals of two RS485 busses.For this I use 2 DMA channels for each UART, one for RX and one for TX.Test runs fine, but if I connect a probe to RX signal, I get an UART IRQ with frame error flag set.I found out that the RX output of the RS485 driver is tri-state during transmit, so this the source of the frame error. It can be solved using external or internal pull-up resistors. This is not the problem, just FYI. What puzzles me:First, I have no clue why this IRQ is fired at all. In my understanding, in order to fire an UART IRQ, the appropriate enable bits must be configured in CR1-3. In this case, only in CR1 the RE, TE and UE are set.Here is the content of CR1 and IRQ registers when the UART IRQ handler is fired:Second, to my surprise, the HAL IRQ handler simply does nothing, no error is thrown or error callback is run. Se

I’m working with an STM32-based system where the RTC is running on the internal LSI. My goal is to maintain reasonable time accuracy (within a few seconds) while periodically receiving the correct world time over an external communication interface.To do this, I preset the expected LSI frequency and continuously calibrate it based on time updates I receive. This logic seems to be working well. However, I'm encountering an issue where the RTC alarm interrupt triggers unexpectedly after modifying the `PRER` (prescaler) register — even though the alarm is configured to trigger only once per minute.Below is the code I'm using to adjust the `PRER` value (executed from within the RTC alarm IRQ): hrtc.State = HAL_RTC_STATE_BUSY; __HAL_RTC_WRITEPROTECTION_DISABLE(&hrtc); status = RTC_EnterInitMode(&hrtc); if (status == HAL_OK) { hrtc.Instance->PRER = synchPrediv; hrtc.Instance->PRER |= (asynchPrediv << RTC_PRER_PREDIV_A_Pos); print("[RTC] - DR:%08X, TR:%08X\n", (hrt

Hello dear community,I’m a beginner with STM32 and I’m trying to interface an APS6404L PSRAM to my STM32H7S3L8H6H using the XSPI1 peripheral. Despite configuring XSPI in CubeMX and generating the initialization code, I see no activity on any of the XSPI1 pins (CS, CLK, D0, D1, etc.) when I attempt a simple “Read ID” command. However, if I reconfigure those same pins as GPIO outputs and toggle them manually, they toggle just fine, so I know the pins themselves are physically working.I suspect that something is missing or mis‐configured in the MX_XSPI1_Init() code, but I’m not sure what to look for next. Below is my XSPI1 initialization and the test routine I’m using:XSPI1 Initialization (generated by CubeMX)static void MX_XSPI1_Init(void){XSPIM_CfgTypeDef sXspiManagerCfg = {0};hxspi1.Instance = XSPI1;hxspi1.Init.FifoThresholdByte = 1;hxspi1.Init.MemoryMode = HAL_XSPI_SINGLE_MEM;hxspi1.Init.MemoryType = HAL_XSPI_MEMTYPE_APMEM;hxspi1.Init.MemorySize = HAL_XSPI_SIZE_64MB;hxspi1.Init.ChipSe

Hi,Our company need to make a I3C demo, so i'm studing I3C protocol with NUCLEO-H503RB and a generic IIC device.We know, I3C bus is compatible with IIC device. I meet a problem.when I2C master read 4 byte data from IIC device’ reg 0x10,  IIC master produce ACK normally.when I3C master read 4 byte data from IIC device’ reg 0x10, I3C master don't produce ACK. Why? How to fix the problem.    

Hello,I am working on the STM32F103xx. I need to read out the 96 bit UDID (unique device ID) of the devices during production. Is there any way of reading this out from the serial bootloader on UART1 or through the SWD interface? I searched the AN3155 and AN2606 but could not find any details.I do not want to flash a temporary firmware just to read it out and then overwrite it again. Nontheless it no other solution is possible I guess its an ugly workaround. It needs to be automated. So using CubIDE is not possible. Thanks

I'm trying to use the LPBAM feature on the STM32U5 to perform I2C communication during STOP2 mode.I followed the official STM32 LPBAM example and implemented my code accordingly.Here is what I'm attempting:Use LPTIM to generate a PWM signal during STOP2 mode.On each rising edge of the PWM signal, trigger an I2C transmit operation via LPBAM.The I2C communication is transmit-only (no receiving).I confirmed that the PWM signal is working correctly using an LED.However, the LCD connected via I2C does not display any data, as if the I2C transmission never occurs.What could be the possible reason why the I2C data is not transmitted even though the PWM trigger is working?/* USER CODE BEGIN Header */ /** ****************************************************************************** * @file : main.c * @brief : Main program body ****************************************************************************** * @attention * * Copyright (c) 2025 STMicroelectronics. * All rights reserved. *

Hi. I'm trying to get HPDMA to write to flash memory on the stm32n6570-dk board. I did the DMA configuration exactly like the XSPI_NOR_ReadWhileWrite_DTR example for the STM32H7. The problem is that all zeros are written and I've run out of ideas what's wrong.  The memory is erased before writing. When I replace HAL_XSPI_Transmit_DMA() with HAL_XSPI_Transmit() the data is written. Maybe someone has an idea why all zeros are written?   Artur

I've requirement of reading 100 samples of ADC data using DMA whenever it's needed in regular mode and I see the read buffer is not having right values and also HAL_ADC_ConvCpltCallback is not hitting.But same if I try just with one sample data is proper and HAL_ADC_ConvCpltCallback is hitting but when I retrigger ADC_DMA_READ I see HAL_BUSY.I'm using NUCLEO-545REQ board /*GLOBAL VARIABLE*/ #define ADC_CONVERTED_DATA_BUFFER_SIZE ((uint32_t) 100) /* Size of array aADCxConvertedData[] */ /* Variable containing ADC conversions data */ uint32_t aADCxConvertedData[ADC_CONVERTED_DATA_BUFFER_SIZE]; int isADCFinished = 0; #define VDDA_APPLI (3300UL) uint16_t uhADCxConvertedData_Voltage_mVolt = 0; /* Value of voltage calculated from ADC conversion data (unit: mV) */ /* Init variable out of expected ADC conversion data range */ #define VAR_CONVERTED_DATA_INIT_VALUE (__LL_ADC_DIGITAL_SCALE(ADC1, LL_ADC_RESOLUTION_14B) + 1) /********************************************************************

Hello, Is there any example code available for Multichannel ADC1 in regular DMA mode for NUCLEO545REQ board. 

Hello, I am working on adding an IWDG to firmware on a STM32F070CBT6TR. The Watchdog resets perfectly fine. I cause the watchdog to reset the MCU by not resetting the timer. I then try to read the RCC_FLAG_IWDGRST and it is always 0. This is what my main looks like before trying to read the flag.bool g_wd_caused_reset = false; int main(void) { // MCU Configuration---------------------------------------------------------- NVIC_SetVectorTable(); // Reset vecter table __HAL_REMAPMEMORY_SRAM(); // Remap boot address to SRAM /* Reset of all peripherals, Initializes the Flash interface and the Systick. */ HAL_Init(); /* Configure the system clock */ SystemClock_Config(); if (__HAL_RCC_GET_FLAG(RCC_FLAG_IWDGRST) != RESET) { g_wd_caused_reset = true; } ... ... } My expectation is that RCC_FLAG_IWDGRST would read 1 after the watchdog causes a reset, but I never see g_wd_caused_reset == true. My IWDG is configured to reset after ~26 seconds. Any help is

Hello Support,    I am not able to find the QSPI config in the STMCube 1.18.1version. I have attached the snapshot. According to the EvalBord it supports QSPI.  CAN you guide me here for the setup.    Best Reagrds, Manikanta

Hi,We are working with the STM32G491 board and intend to drive the NRST pin using an external device. Could you please confirm the minimum low-level pulse duration on the NRST pin for it to be recognized as a valid reset by the MCU?

The chip is H743. After performing a erase operation on a page and resetting it, when I read the page again, the debug page shows that the erased page is 0xAA. As long as I read it, I will enter hardfault. Have you ever encountered a big shot,

I would like to ask about the current load. I expect to use three sets of SDADC, SPI, and USART, all of which will use DMA for transfer and operate at a frequency of 11000HZ. The clock will use an external 12M crystal oscillator. I estimate from official data that it will be 60mA. I don't know if this judgment is feasible.

Hi everyone,I’ve designed a schematic based on the STM32G0B1CE microcontroller. Since there’s no official development board available for this specific MCU, I used the schematic of the STM32G0B1RE Nucleo board as a reference, along with the STM32G0B1CE datasheet, to create my design.I’m planning to use the internal 16 MHz oscillator, so I’ve opted not to include an external HSE or LSE in the design.I would greatly appreciate it if anyone could review my schematic and provide feedback. If there are any issues, missing components, or design improvements you can suggest, I’d be thankful for your input.Thanks in advance!

I've been trying to find examples of the STM32N6 using the internal SMPS however, other than trying to reverse engineer the Nucleo or Discovery boards, there doesn't seem to be much literature available showing this.Ideally (for cost and board layout reasons), I just want to power the N6 with a single 3.3V supply (plus the 1.8V AON supply) and use the internal SMPS to provide VDDCORE.Can anyone point me in the right direction, please? 

Hello, I just designed an electronic card using the STM32G474QET6TR. Just a day before receiving the card I realised I had made a mistake on the routing. I want to use SPI2 to driver 2 MAX4896ETP+ that are daisy chained.As per the MAX datasheet, to do this you're supposed to connect as follows : But I realised while doing the pin allocation on the ioc file of my new STM32CubeIDE project that I actually messed up on my routing. I inverted the SPI2_SCK and the SPÏ2_MISO.SO I'm left with:- PB13 connected to the second MAX DOUT- PB14 connected to the both MAXs SCLKWHen it should be the otherway arround. SO my question is acually quite simple, is it that big a problem ? Can I fix it through software or am I going to have to cut both tracks and then solder a wire to invert it ? Thanks for your time and answers  

According to erratum 2.22.10 of STM32H562xx/563xx/573xx in RMII 10MHz mode packets should be accepted when both dribble and CRC error is flagged. According to Reference Manual RM0481 Rev4 Table 692 dribble bit is valid in MII mode only. Pls. clarify   

Hello, I'm trying to use the repeat counter of the 2D GPDMA peripheral. However, when I configure this with CubeMX and run it, I can see that the BRC register is always at zero, while the BNDT register is set to the correct value. I've stepped through the initialization code and the node does have the correct parameters, they just don't get configured into the ADC on the HAL_DMAEx_List_Start_IT call in HAL_ADC_Start_DMA. I have also tried to configure it using linked list mode with the same parameters, which resulted in the same behaviour. The first "block" gets copied properly, it just never uses the repeat counter, remaining at the first block.I know the ADC code is working fine since it runs fine when using non-2d addressing.The Node Config that is retrieved in the HAL_ADC_Start_DMA callAfter the HAL_DMAEx_List_Start_IT call in HAL_ADC_Start_DMACubeMX Config part 1CubeMX Config part 2 

Hello, Datasheet DS14791 Rev 4 has a note on page 161 stating that PCB and pin capacitance for the OSC_IN/OSC_OUT Interface can be assumed as 4 pF combined.I qoute: "For CL1 and CL2, it is recommended to use high-quality external ceramic capacitors,designed for high-frequency applications, and selected to match the requirements of thecrystal or resonator (see Figure 20). CL1 and CL2 are usually the same size. The crystalmanufacturer typically specifies a load capacitance, which is the series combination of CL1and CL2. The PCB and pin capacitance must be included (4 pF can be used as a roughestimate of the combined pin and board capacitance)." I would calculate C1 = C2 = 2*(C_LOAD - C_STRAY) and assume C_STRAY with 2 pF in this case.- Can you confirm that this is the correct way to size C1 and C2? I was wondering if the same assumption can be made for OSC32_IN and OSC32_OUT Pins. I didn't find a note on that. Otherwise I would go by the chapter 5.3.17 I/O port characteris

Hi,I need to understand better how the "HAL_SAI_Receive_DMA(&hsai_BlockB1,ADC_Buffer,CodecBuffer_Size)" works.I've a codec connected to the SAI 1 of a STMH723 MPU and I implemented a Ping-Pong routine to acquire and send the data to the Codec; two Callback function swap the buffers:uint8_t ADC_Buffer[80000] __attribute__ ((aligned (4))); void HAL_SAI_RxCpltCallback(SAI_HandleTypeDef *hsai_BlockB1){adcp31=(q31_t *)&ADC_Buffer[BUFFER_SIZE_R/2];RxDataReady1=1;} void HAL_SAI_RxHalfCpltCallback(SAI_HandleTypeDef *hsai_BlockB1){adcp31=(q31_t *)&ADC_Buffer;dacp31=(q31_t *)&DAC_Buffer;RxDataReady=1;} If I write HAL_SAI_Receive_DMA(&hsai_BlockB1,ADC_Buffer,20000) what happens (in details) ? Thank you

Hello,i use a STM32G051K6 with LL Drivers and want to implement I2C. But all the time it sends Slave ID, 0x01, Byte 1, 2 and so on. Here i Call 0x38 Slave ID: And here all Data:And this my Code: LL_I2C_TransmitData8(I2C1, 0x00); LL_I2C_HandleTransfer(I2C1, 0x70, LL_I2C_ADDRSLAVE_7BIT, 3, LL_I2C_MODE_SOFTEND, LL_I2C_GENERATE_START_WRITE); LL_mDelay(1); for (int i = 0; i < 3; i++) { while (!LL_I2C_IsActiveFlag_TXE(I2C1)); // Wait until the data register is empty if (LL_I2C_IsActiveFlag_NACK(I2C1)) { // Check for NACK (Not Acknowledged) return 1; } LL_I2C_TransmitData8(I2C1, i+10); //temp[i]); // Transmit data byte LL_mDelay(1); LL_I2C_ClearFlag_TXE(I2C1); } LL_I2C_GenerateStopCondition(I2C1); LL_mDelay(1); LL_I2C_ClearFlag_STOP(I2C1);I Hope you can help me with this Topic :)BR rspecht

Hi,Has anyone used the STM32H750B-DK on-board eMMC, 4GB memory.I have been unable to find an example and it is a big job to write something from scratch.I am assuming that it would use the SDMMC1 peripheral in MMC 8 Bit mode and that you would need to port fatFs to it.I cannot find any detailed data sheet on the THGBMTG5D1LBAIL / THGBMDG5D1LBAIL chips to get the correct timing data etc.  Does anyone know where to get a detailed sheet. All that is readily available is a data brief for promotional purposes.The parameter settings for the interface are pretty basic:So it shouldn't be too difficult, but any help would be appreciated.  Kind RegardsRob 

Hi everyone,I'm having an issue with HSE bypass mode on the STM32G0B1RCT6 and hoping someone here has seen something similar.The HSE randomly won't start in bypass mode. I've tried two different oscillators - the S2D8.000000B20F30T and an OT32258MJBA4SL that I pulled from a working STM32F405RGT6 board where it runs without any problems.The behavior is inconsistent. Sometimes it starts up normally and then runs solid. Other times it just won't set the HSERDY flag. We've tried both toggling the NRST pin and resetting from code, but neither changes the state - if it's working, it stays working, and if it's not working, it stays not working. Only power cycling the entire board can change the state in either direction, sometimes making a non-working board work or making a working board stop working.On the scope, the signal from the oscillator is always visually fine.Any ideas or suggestions for debugging this would be helpful!

Hello, I'm using stm32u5 series MCU and I need help on below.1. System clock I've configured to 24Mhz and how do I set my ADC clock to sample at 20Khz2. Without DMA, single channel data collection I'm able to do but not able to do for multiple channels.