STM32 MCUs Products

Can STM32L051 set LSE be LPUART clock source to wake up the MCU? If yes, how to configure.

Team, I have designed Custom Board with STM32F303Rb device and Having USB FS Communication and PWM Compare Output. I m Using The 8Mhz SMD Crystal (YXC make) : https://www.hxcyic.com/upload/202311/27/202311272250036173.pdf Datasheet States CL = 20 pF , Cs = 3 pF and ESR = 80 ohm. From this post : https://community.st.com/t5/stm32-mcus/how-to-select-a-compatible-crystal-and-load-capacitors-for-stm32/ta-p/780236 Deriving Excel Calculation , CL1=CL2 terms out 33pF. Which I populated On Board. Issue : Sometimes , I am getting Pulse missing Issue during the Run time...Not sure why  I just want to Verify the CL Value I am using is Corect or Not ? Previously , I was Using Through hole part HC-49S Crystal with CL1=CL2=20pF. @mƎALLEm  

Hi all,I've created a new default project for the STM32N6 Discovery Kit, and set up a simple blinking application using the BSP LED functions. /* USER CODE BEGIN 2 */ BSP_LED_Init(LED_GREEN); while(1) { HAL_Delay(1000); BSP_LED_Toggle(LED_GREEN); } /* USER CODE END 2 */I've noticed that in the Application, HAL_Delay() runs roughly 2× too fast. For example, HAL_Delay(1000) only delays for ~500 ms. I can see this because the LED is blinking too quickly.In this Application, TIM2 is used as the timebase source (I presume because of ThreadX using SysTick).I looked at the TIM2 setup in HAL_InitTick() (inside stm32n6xx_hal_timebase_tim.c). The relevant snippet is: /* Compute TIM2 clock */ uwTimclock = HAL_RCC_GetPCLK1Freq(); /* Compute the prescaler value to have TIM2 counter clock equal to 1MHz */ uwPrescalerValue = (uint32_t) ((uwTimclock / 1000000U) - 1U); /* Initialize TIM2 */ htim2.Instance = TIM2; /* Initialize TIMx peripheral as follow: * Period = [(TIM2CLK/1000) - 1

Hi,I am trying to configure the internal cooperators in the STM32F051 micro-controller, but in the .ioc file I am able to configure only one Comparator. I require three comparators for my application. Is it possible to configure multiple comparators on the STM32F051 development board? If so, could someone please explain how to configure multiple comparators in the STM32F051 micro-controller?

I would like to implement delay signal output with STM32 MCU.So I use the original signal input for EXT interrupt.EXT interrupt's callback activates the timerIf a timer callback is called after a time delay of the desired value, it is implemented by setting the GPIO pin to HIGH.However, it can be confirmed that the desired amount of delay is achieved, but the timing of the pin becoming HIGH varies each time, and it takes about 1.5 to 1.8us between EXT and TIMER.I would like to know if the idea can be implemented as STM32 MCU series. also posting my Clock Configuration pic   

I am using I2S (SAI) on the STM32L433 nucleo board and using the internal MSI RC as the clock source.I also have a 32.768kHz LSE external crystral which I believe helps to make the MSI RC clock more accurate when used with PLL.Is the internal MSI RC clock suitable for I2S, or do I need to use an external crystal HSE (12.288MHz) ?I do get occasional glitches/clicking but I am using development boards with jumper wires, even a small amount of movement with these wires cause issues.The clock configuration is below...The STM32 is configured to be the I2S master which receives audio from a bluetooth receiver (BT401) and passes that audio through to a class D amp (MAX98357A) as shown below...  When certain events occur, voice prompt audio is injeteced into one channel which is stored in external flash connected to the STM32 SPI .

Hi, I am using an STM32H755XIH6 MCU in a custom design. I want to use only LDO supply configuration for the internal power regulator that provides the VCORE and I don't really intend to use the SMPS configuration. My schematic has some hardware mistakes, just want to understand their impact before doing a rev. 1. According to RM0399, Section 7.4 - Figure 22, when using LDO supply, do we still need the cap (mentioned) on the VCAP pin? Is it recommended or mandatory? Would it cause major issues if its left floating for example? 1.1. Follow up question on this, is if we plan to use LDO only, does the VDDSMPS and VFBSMPS pin state matter? I have mistakenly left VFBSMPS floating and it's impossible to access it without revving the board. 2. If we don't plan to use VBAT (backup battery), it is given in RM0399, Section 7.4 that VBAT must be connected to VDD if battery is not used and needs a 100nF ceramic decoupling cap on VBAT pin (mentioned in RM0399 Section 7.4.4).

I do a project with the newer STM32 G , C series and i am curious what are the benefits of external clock vs using the internal clock, because it will save cost and layout space ?

Hello, as in this post i'm linkingIs there a way to use absolute encoders/resolvers ... - STMicroelectronics Communityi need to use a Biss-c absoulte encoder for a servo drive application using BLDC motors with STSPIN32G4, we are testing using EVSPIN32G4.In the workbench i did not find the configuration for directly feedback through absolute Biss-C encoder. Am i missing something?Other way to do this could be go through SPI peripheral to read absolute Biss-C encoders, but as asked in the post linked, how could i use SPI data to be used from BLDC controller?  Thanks to everyone helping. Jackex

Hi.I have Uart pins (Rx/Tx) PA3 and PA2 on STM32F407VET6. Can these pins be changed to I2C (SDA SCL) in the program?Are the pins on STM32 that have been assigned a protocol (SPI/I2C/Uart) constant and cannot be changed or replaced?Thank you.

 The maximum I2C (Standard) Rise Time/Fall Time of STM32F413VGT is stated as 0.1us/0.3us, but STM32 Datasheet says 1us/3us. Please confirm which one is correct.  

Hi fellows,I have a custom board with STM32F407VGT6. The board was able to be programmed via the JTAG (4 wire JTAG interface; Boot pin is pulled low to ground and reset is connected to the JTAG interface (Nrset pin)) with a segger programmer - multiple times at that and can run for hours, however sometimes it code wipes. The board works fine for some time, but only upon boot-up (at random, happened twice thus far) we have seemingly a code-wipe as well as a bricked chip with the RDP set to 0xFF and unable to do anything with the chip. This does not happen during continuous running of the chip. We have this across 2 differently designed boards, which are designed according to the reference manual for power supply and for the tests were supplied with external linear regulator with low noise.   I have seen some posts here but not conclusive solutions or cause for this issue, is it possible to trigger this externally via hardware faults ?The chip reports back correc

Hello,I have application which go to STOP2 mode once no LPUART/Modbus communication (Running at 32Khz LSI clock) is in progress.Using lptimer for silence timeout logic for UART data frame completion. The code sometimes cause delay during modbus communication.void setLowPowerMode() { clearFaultStatus(); ResetTickMs(); HAL_UARTEx_EnableStopMode(&hlpuart1); HAL_PWREx_EnterSTOP2Mode(PWR_STOPENTRY_WFI); ResetTickMs(); Reset_SystemClock();//internally call SystemClock_Config() HAL_LPTIM_Init(&hlptim2); //Need to re-init otherwise doesnt work HAL_LPTIM_Counter_Start(&hlptim2); HAL_UARTEx_DisableStopMode(&hlpuart1); } uint32_t GetTickMs(void) { uint32_t now = HAL_LPTIM_ReadCounter(&hlptim2); uint32_t delta; if (now >= lptim_last_cnt) { delta = now - lptim_last_cnt; } else { delta = 65536U + now - lptim_last_cnt; // wrap-safe } lptim_last_cnt = now; // Add fractional milliseconds in fixed-point lptim_frac_acc += delta * 1000UL; // Extract w

Hi All,I am trying to send data to SPI1 via DMA1 Stream 0, using a timer to trigger DMA.Currently, I have used TIM4 Channel2 and Enabled DMA Update with DIER register (UDE bit).DMAMUX1 Channel 0 Request is set to 32.So far, this part seems to work: I have used a LED to monitor HT and TC flags of DMA, and it toggles at the speed it should.But the SPI does not send anything (I checked the MOSI and SCK lines with an oscilloscope)... as if TXDR register was not filled by the DMA.Do you have an idea of what is happening?I have checked that my buffer xyDacData is correct (not null), and also I monitored SPI CR1 as well as SPI SR with SWD debug, all seems OK (SR is null, CR1 shows SPE and CSTART at 1).Thank you!(About SSM and SSI bits, I have set these to test, but they should be useless, since I am in master transmitter mode.. /* * FBx_XY.c * * Created on: Sep 10, 2024 * Author: Thomas */ #include "main.h" #define XY_SYNC_BITS (24 + 8) // Take some margin #define DURATION_SPI_

Hello, i am stuck on UART topic and i have an argument with someone.He states that ReadMemory(0x11) is sent by STM32. Is that really so? Does STM32 at any point sends "0x11" as response? I must be missing something...

Hi in an dual core stm32h7, if we use each iwdg for each cores, when iwdg trigger reset,it will reset the particular core or both the cores will reset.If particular core reset happens means, how to manage the other core from initial boot.Suppose if cm7 IWDG trigger reset, meanwhile cm4 is running on other side, during this time after cm7 reset we have to read the iwdg register, then perform nvic reset?If cm4 iwdg trigger reset, it will affect the other side running cm7 core.  Regards,Srinath  

MCU: STM32H723VET6ADC: ADC1 / ADC2 / ADC3 (12-bit, single-ended)VREF: 3.3 VApplication: Digital Multi meter (DC / AC voltage measurement) Problem DescriptionIn my DMM hardware design, the Analog frontend applies a mid-scale level shift (VREF/2 = 1.65 V) before the ADC input.This is done intentionally to support bipolar AC measurements using a single-ended ADC:  Input signal → amplifier/divider → +1.65V offset → ADC (0–3.3V)As expected:0 V input → ADC reads ~1.65 VPositive/negative AC swings are in around mid-scaleHowever, for DC voltage measurement, I want the behaviour to be:No input connected → display 0.000 VApplied DC voltage → display the same voltageMid-scale offset should NOT appear in the final DC readingObserved IssueIf the mid-scale offset is not removed after ADC conversion, the firmware reports:~3 V on 6 V range~30 V on 60 V range~300 V on 600 V rangeeven when no voltage is applied.This is because the ADC correctly reads ~1.65 V, but that bias is still presen

I have a custom board with an STM32G051.  The STM32 is a SPI receive only device.  PA1 is SCLK, PA2 is MOSI, PB0 is nSS (which is hardware controlled).  The beginnings of the project where created with CubeMX so the clocks should all be set correctly.The SPI transactions are simple 12-bit data with an active low chip select.  Note that the MISO signal is not connected on the board.  The master device does not read any data from the STM32G051.The SPI peripheral is setup as below: hspi1.Instance = SPI1; hspi1.Init.Mode = SPI_MODE_SLAVE; hspi1.Init.Direction = SPI_DIRECTION_2LINES_RXONLY; hspi1.Init.DataSize = SPI_DATASIZE_12BIT; hspi1.Init.CLKPolarity = SPI_POLARITY_LOW; hspi1.Init.CLKPhase = SPI_PHASE_2EDGE; hspi1.Init.NSS = SPI_NSS_HARD_INPUT; hspi1.Init.FirstBit = SPI_FIRSTBIT_MSB; hspi1.Init.TIMode = SPI_TIMODE_DISABLE; hspi1.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE; hspi1.Init.CRCPolynomial = 7; hspi1.Init.CRCLength = SPI_CRC_LENGTH_DATASI

i have written a driver code to run 4 wire resistive touch panel. I use only 1 adc and change its adc channel during runtime. Like i set X+ and Y+ as output high by default and X- and Y- set as low by default and set X- and y- pull down to make ADC read 0 when not pressed. Basically, I have few functions that change the configuration such as X+ and X- to output, set Y+ to analog and Y- to input to set Y+ and Y- as an output, set X+ to analog and X- to input. read x voltage in previous case and read y voltage in later case. ADC is only one to switch the configuration during runtime and its resolution is 16 bit with 810.5 cycles sampling time.    ISSUES: 1- gpio output 3.3v and ground but its adc measuring voltage is from (0.7 to 1.15 for x axis) and (0.55 to 2.8 for y axis) 2- if i move the wires then its voltage ranges change.   Is this issue related with the firmware developed for running the 4-wire touch panel or hardware issue? I have connected decoupling capacit

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Post edited by ST moderator to be inline with the community rules for the code sharing. In next time please use </> button to paste your code and a linker script content. Please read this post: How to insert source code. I have a STM32L433RCT3 and I'm exploring using the USART wakeup feature from STOP1 on RXNE. To improve the wakeup time and not miss any data, I clock the USART directly from the HSI and I configured the wakeup clock to be the HSI. I'm wondering if someone could confirm this is a safe thing to do at 115200 baudrate? I'd rather not use the USART's UCESM: USART Clock Enable in Stop mode bit to keep the clock running in STOP1 mode (significantly more sleep current).From what I understand, the HSI takes a maximum of 6.2us to start up & stabilize? (Section 6.3.8 of Datasheet). Do you add the startup time (1.2us) and the stabilize time (5us) or do I just take the stabilize time? At 115200 baudrate, there is a bit coming every 8.68us. Theoretically, do I ha

Hello! I need help. STM32L073RZT6 MCU.How can I write, for example, 2 times 8 Bytes into any second half-page of flash memory?Every first page is recorded successfully and read successfully. For example, I write 8 Bytes of data to the beginning of the _writeBuf buffer (half page size) (fill the rest with zeros), erase the entire page of interest (*(__IO uint32_t *)_write_address = 0;), write _writeBuf to the first half page, the recording is successful. Write a next 8 bytes of data to _writeBuf after current 8 Bytes of data and I write it down in the first half page in the same way, it also goes well. With a similar operation, the first 8 Bytes are written to any second half page successfully, but when the next 8 Bytes are written to any second half page, the NOTZEROERR error occurs.

Both in the manual and in CubeMX, it is shown that my microcontroller, has the ability to configure the FMC, for an asynchronous muxed PSRAM interface.However, in the manual I can only find the timing description for the asynchronous NOR Flash and for synchronous NOR/PSRAM.Am I missing something here, or is it missing in the manual itself?

HI,I would like to use the speaker output on the STM32H563ZIT6. I reviewed the wiki, but there aren't any references about how to play audio with the speaker output. Is it possible to enable this output to play audio?Does the STM32H563ZIT6 have built-in capability to directly convert this digital data to an analog signal for speakers without using an external CS43L22 DAC (Digital-to-Analog Converter)?Regards,Berlin

Hi.I am trying to test out a fault handler for our STM32G (right now, the fault handler just tries to determine the location of the code that caused the fault).If I force a fault (divide by zero) in "normal" non-interrupt handler code, I can easily read the stack frame, find the PC and determine the location of the fault (stack frame is located in the process stack).If I force a fault in an interrupt handler (USART1, using HAL code), the stack frame on the main stack does not make sense to me (what I think the PC is, does not point to a location in flash memory). If I add 0x50 to the address in the MSP, then I can see a stack frame with the correct PC.Is there a section in PM0214 that can explain what I'm seeing?I attached a few screenshots from the debugger in STM32CubeIDE that show the call stack and memory.In my example, the MSP in the fault handler points to 0x2001fde8, and the LR is 0xfffffff1.  The stack frame I'm expecting to see is at 0x2001fe38.Thank you!