Others: STM32 MCUs related

 Hello,I am currently using the STM32L496 microcontroller in a product design. In this design, I use PC1 as an output to control the EN (enable) pin of a TPS78228 LDO. I'm encountering an issue where the LDO exhibits unexpected behavior when EN is driven low by the STM32. Setup Details:There is a 470 kΩ pull-down resistor between PC1 and the EN pin.A 4.7 µF capacitor is connected to VOUT, as recommended.When I manually pull EN directly to GND (bypassing PC1, when STM32 is powered-off), the LDO shuts down correctly, with VOUT dropping to 0 V.However, when STM drives PC1 low, the EN pin voltage appears close to 0 V, but VOUT remains at 1.8 V.Vin is within the recommended range and remains the same in both cases. I’ve attached two scope captures showing two different behaviors. In both:Blue = VEN (EN pin voltage)Orange = VOUT (LDO output)In Figure 1 STM32 is not in use and I manually drive the enable pin to the GND and to VCC interchangeably. As expected, VOUT drops to

Hello,I’m working with Simulink and an STM32G4 series microcontroller. I’ve successfully set up PWM generation and configured the ADC in injected mode, synchronized with the PWM timer (TIM1).However, when I enable External Mode in Simulink (for real-time parameter tuning and signal monitoring), the connection fails. Interestingly, everything works fine when I trigger the ADC using a different timer—the issue only occurs when TIM1 is used to trigger the injected ADC.My setup:Target: STM32G4 (e.g., STM32G4)PWM generated using TIM1ADC in injected mode, triggered by TIM1External Mode communication over STLink (USB)Question:Is there a known limitation or conflict between External Mode and using injected ADC mode synchronized with PWM (via TIM1) on STM32 targets in Simulink?Could this be related to timing/resource conflicts?Do you have any suggestions or workarounds to maintain synchronized ADC injection while using External Mode?Thanks in advance for your support!

Hello everyone,Please review the eMMC and LCD interface connections designed using the STM32H7A3ZIT6Q MCU.The schematics are attached. I would greatly appreciate it if anyone could review the schematic and provide feedback. If there are any issues, missing components, or design improvements you can suggest, I’d be thankful for your input.

Hello ST Community,I am working on a project using the STM32H753VIT6 and have already successfully implemented CAN FD communication using the FDCAN peripheral and HAL drivers.Now, I would like to implement CANopen FD on this setup.My questions:What libraries or open-source stacks are available for CANopen FD that can be integrated with STM32 (CMSIS/HAL based)?What are the hardware or timing considerations for running CANopen FD at higher bitrates? My transceivers are currently non-isolated.How should I structure the implementation of:Object Dictionary (OD)USDO (Universal Service Data Object)PDO (Process Data Object)Is there a reference example or demo project for CANopen FD (not classic CANopen) with STM32?Any guidance, sample code, or links to documentation would be greatly appreciated.Thanks in advance!—Pavan

Hello everyone! After countless hours of self-grind, talking to different LLMs about it (and mostly failing), I may have started to get some faint idea about what I am doing. I am mostly writing this post for a sanity-check. Currently, for a medical device, we are trying to connect an external (ADS127L11) ADC to our MCU. When we use our MCU’s internal ADC, everything works fine, but we want to explore other options, to hopefully lower the internal noise. Project snapshotMCU STM32H743ZITx (CubeIDE 1.14, FW_H7 1.12.1)ADC ADS127L11 (24-bit ΔΣ, SPI Mode-1, push-pull DRDY)Goal 100 k samples / s, minimal jitter → DMA ping-pong → USB CDCPin ConfigurationPE11 = SPI4_NSSPE12 = SPI4_SCKPE13 = SPI4_MISOPE14 = SPI4_MOSIPE15 = DRDYPB10 = STARTPB11 = RESET (Connection Config = Full Duplex, NSS Input / Output for some cases, see below) Original Plan -> Failed due to DMAMUX setupFrom what I understood thus far, there is this DRDY pin driven by the ADC. If it gets low, this

Hello everyone, I was trying to use 2 mics  IMP34DT05 in stereo configuration with MCU.I wanted to capture signals from both the mics as well as i want to use single mic also. Please guide how can be this configuration done in schematic and how should be the 2 mics placed together. Best Regards,Sakshi 

Use CY7C1441KV33 to expand memory space on STM32H7A3, with the following connections：：The timing requirements for burst read and write of CY7C1441KV33 are as follows:   (1)Read timing: First read the data of CY7C1441KV33, and then add 1 to the internal address of CY7C1441KV33.(2)Write timing: First, add 1 to the internal address of CY7C1441KV33, and then write data to CY7C1441KV33. STM32H7A3 can meet the read timing requirements of CY7C1441KV33. But STM32H7A3 does not meet the writing timing requirements of CY7C1441KV33. May I ask if STM32H7A3 can use CY7C1441KV33? NOTE：The burst read timing diagram of STM32H7A3 and CY7C1441KV33 is shown below：STM32H7A3 read timingCY7C1441KV33 read timing The burst write timing diagram of STM32H7A3 and CY7C1441KV33 is shown below:STM32H7A3 write timingCY7C1441KV33 write timing 

Hello Everybody,I’m developing a Class 0.2 energy metering system for 1-phase, 3-phase (3-wire), and 4-wire configurations. I plan to use the STM32H7 series MCU due to its high performance, Ethernet support, and peripheral flexibility.However, in my design:Voltages are sampled via external ADCsCurrents (via CTs) are measured remotely and transmitted over RS485 or EthernetTherefore, voltage and current data are not synchronously sampledI’m looking for guidance on the following:Are there any STM-provided or third-party libraries compatible with STM32H7 that support energy metrology under asynchronous sampling conditions?If not, would using a dedicated metering IC (e.g., from Analog Devices, Cirrus Logic, or TI) be a better approach, with STM32 handling higher-level tasks?Are there reference designs, application notes, or open-source examples that support this use case?Would you recommend an alternative MCU or platform better suited for this application, with existing metrology support an

Hai.., We are using a custom board with STM32H743IIT6 soldered to it. For our application, we need more Analog Inputs so we have used TLA2528 chip. Below is the code for it..   tx_buf[0] = TLA2528_PIN_CFG; tx_buf[1] = 0x00; HAL_I2C_Master_Transmit(&hi2c4, TLA2528_I2C_ADDR, tx_buf, 2, HAL_MAX_DELAY); tx_buf[0] = 0x10; tx_buf[1] = 0x00; HAL_I2C_Master_Transmit(&hi2c4, TLA2528_I2C_ADDR, tx_buf, 2, HAL_MAX_DELAY); tx_buf[0] = TLA2528_CHL_SEL; tx_buf[1] = 0x00; HAL_I2C_Master_Transmit(&hi2c4, TLA2528_I2C_ADDR, tx_buf, 2, HAL_MAX_DELAY); tx_buf[0] = 0x01; tx_buf[1] = 0x08; HAL_I2C_Master_Transmit(&hi2c4, TLA2528_I2C_ADDR, tx_buf, 2, HAL_MAX_DELAY); HAL_Delay(20); HAL_I2C_Master_Receive(&hi2c4, TLA2528_I2C_ADDR | 0x01 ,rx_buf, 2, HAL_MAX_DELAY); result = (rx_buf[0] << 8 | rx_buf[1] ); While Debugging we could only get the value as "0x00". Could you please help us with this issue?   we have attached the TLA2528 Datasheet below for your reference

Hello,I want to try this open-source project. https://www.pcbway.com/project/shareproject/STM32F4xx_Maker_PCB_MakerST_1_ab9866e3.htmlIt's based on an STM32F4xx microcontroller and appears to be designed for general-purpose prototyping. I had a few questions after reviewing the schematic and layout, and I was hoping someone with experience in custom STM32 board design could shed some light:Boot Mode Configuration:How does this board handle BOOT0 selection? I couldn't clearly identify if there's a jumper, switch, or default pull configuration. Is it safe to assume it's hardwired to always boot from flash?SWD Debugging Interface:The board exposes the SWD pins, but I didn’t find much detail on signal integrity (length matching, protection resistors, etc.). Are there any known limitations or considerations when using a low-cost ST-Link or J-Link with this kind of layout?Power Supply Design:The project uses a USB Type-C connector for power, but I’m unsure if it follows proper USB PD or

I need to complete a project to use a microcontroller, STM32 and Keil software to measure barometric pressure, ask for guidance or resources,please...

Hi,I am trying to interface the SparkFun Neo M9N GPS module with an STM32F446 MCU using UART4, but I am unable to receive any GPS data. Interestingly, when I switch to USART1, the module works perfectly.Could you please help me understand why UART4 is not functioning while USART1 works fine? Additionally, I could not find any reference code for interfacing the module using I2C. If any source or example is available, it would be greatly appreciated.Thank you!

Dear Support Team,I hope this message finds you well.I am currently working on a project where I am trying to interface your BNO085 IMU module with an STM32L433RC-P Nucleo board. Despite numerous attempts, I have not been able to retrieve any meaningful data from the sensor.Here are some of the key points of what I’ve tried so far:I’m using I²C (also tested with UART) for communication.Verified all hardware connections and logic level compatibility (3.3V).Tried using both polling and interrupt-based approaches with STM32 HAL.I have already tested the sensor separately with Arduino, and it works fine.I also attempted different initialization sequences and delays, but the sensor remains unresponsive on STM32.I would appreciate it if you could help guide me with any known compatibility issues or suggestions specific to using the BNO085 with STM32 microcontrollers. If you have any example code, documentation, or tips for STM32 integration, it would be immensely helpful.Looking forward to y

Greetings,We've found several STM32 MCUs with what appear to be poorly executed laser engravings. Is there anyone I can contact to get an official opinion on these chips?We are not the firm that designed and built the boards. We are reviewing other firm's boards and do not have access to supplier or similar information.Thank you.-David

I’m using the STM32H563VI microcontroller in my project, together with an external STWD100PY watchdog connected to it. When I try to flash the microcontroller’s memory, the watchdog resets it during the programming process, causing the write to be interrupted. How can I solve this? I’m using the Segger J‑Link programmer in SWD mode (SWCLK and SWDIO).

Hi, Programmed sparkfun thing plus stm32f4 i2c bus in slave mode and sending the serial data to the i2c bus. The bus is hanging after some point of time.   Any help will be appreciated.   Thanks,

Hi all, I am currently trying to configure the NUCLEO-F072RB to work with an EVM board from TI via SPI. I am very new at using STM32 and I am not quite sure how to go about it. 1) I have already used CubeMX to do the recommended settings. Do I also need to write the control registers in spi.c as indicated in the F072RB reference manual? For example: void configSpi_SSM(void) { //CONFIGURE SPI1_CR1 REGISTER //CLEAR BITS SPI1->CR1 &= ~((1u << 15) //FULL DUPLEX MODE |(1u << 13) //NOT INTERESTED IN CRC CLACULATIONS, DISABLE CRC |(1u << 10) //NOT INTERESTED IN SIMPLEX MODE |(1u << 7) //MSB FIRST |(7u << 3) //RESET BITS THAT DIVIDE THE FREQUENCY BEFORE SETTING THEM AGAIN ); //SET BITS SPI1->CR1 |= ((1u << 9) //SOFTWARE SLAVE MANAGEMENT |(1u << ‌‌ //INTERNAL SLAVE SELECT |(4u << 3) //DIVIDE SPI FREQUENCY BY 32 |(1u << 2) //MASTER MODE |(0u << 1) //CLOCK POLARITY OF 0 |(1u << 0) //CLOCK PHASE OF 1 ); //CONFIGUR

I'm trying to interface DHT22 with STM32F429i but the problem is that the sensor never responds with the high signal for 80 micro seconds after the initialization. Here you can find my code, so please tell me what could be wrong, I have been debugging this for the past week with no progress. if ((HAL_GPIO_ReadPin (DHT22_PORT, DHT22_PIN))) Response = 1; // if the pin is high, response is ok this if statement in line 126 never goes true. therefore the response is -1.

STM32WB55 NUCLEOI have 2 ADXL362s on SPI1.They both have their own separate chip select GPIO pins.They are both configured the same.They are both in the same orientation (on the same breadboard).The output of both is processed using the same logic.One of them gives expected results, the other is consistent but wrong! Just as a sanity check, I am OK to run two sensors on the same SPI bus as long as I'm clear which chip is selected?

Hi  I'm trying to drive a screen through a parallel interface. The screen has the ST7796 driver. I was able to initialize it, but it only displays noise. When data is sent through the parallel interface, it doesn't display. Do you know the necessary LTDC configuration? Or if special hardware is needed to connect the screen? I'm currently connecting the screen to the H7A3ZI core card with cables.

No Data Received on MCU.We have connected MAX3232 RS-232 IC on UART2 (PA2 - Tx & PA3 - Rx) of STM32F0303RCT6.When UART2 is Configured in Loopback, we are receiving the data that is being transmitted by MCU - on both MCU Loopback & MAX3232 Loopback.But when we are using CP2102 USB to TTL with MCU or USB to Rs-232 Convertor with MAX3232 IC Interface, we are not receiving any data on the MCU. We have check USB to TTL (CP2102) with UART4, we are receiving the Data.We have checked waveform on Oscilloscope, when using USB-TTL or USB-RS-232 data on Rx is observed on every 2-3 send from Laptop, but no data is received on MCU. Find the Schematic & Layout in Attachment

Hi, I am working on configuring LoRa (E22-900M22S) and the MAX3485 transceiver to establish RS-485 communication using the STM32H753ZI. I have connected the LoRa and MAX3485 modules as per the following reference:LoRa(E22-900M22S)LoRa PinSTM32H753ZI Pin (example)MOSI PA7 (SPI1_MOSI)MISO PA6 (SPI1_MISO)SCK PA5 (SPI1_SCK)NSS PA4 (GPIO)RESET PB0 (GPIO)DIO1 PB1 (EXTI-capable GPIO)DIO2PB2 (EXTI-capable GPIO)BUSY PB10 (GPIO input)GNDGNDVCC3.3V RS-485(MAX3485)STM32H753ZI PinMAX3485 PinPD8DIPD9ROPD12 (or any GPIO with DE support)DE + RE (tied together)3.3VVCCGNDGNDCould you please guide me on how to configure both LoRa and RS-485 communication using STM32CubeIDE?

Hello everyone,I'm currently working on a project using an ADS8688 ADC IC and an STM32F446RET6 microcontroller.I'm encountering an issue where I'm consistently reading random or garbage values over SPI, even when I'm applying stable input voltages to all 8 channels of the ADS8688. I've verified the input voltages with a multimeter, and they are as expected.Here's a brief overview of my setup and what I've tried so far:Hardware:ADC: Texas Instruments ADS8688 (8-channel, 16-bit, SAR ADC)MCU: STM32F446RET6 (using one of its SPI peripherals)Problem Description: When I apply known DC voltages to the input channels of the ADS8688, the data I receive over SPI from the STM32F446RET6 is not the expected digital conversion result. Instead, it appears to be random or corrupted, showing no correlation with the input voltage.What I've Checked/Tried So Far:SPI Configuration (STM32F446RET6):SPI Mode: I'm using SPI Mode 1 (CPOL=0, CPHA=1), which is typically recommended for the ADS8688.Clock Prescaler

Hello,I'm currently working on an STM32 project using FreeRTOS, and I'm facing an issue with UART2 communication when interfacing with a GPRS module.Project Setup:UART3 is used for debugging (connected to a PC terminal) and is functioning correctly.UART2 is used for communication with a GPRS module.Both UART2 and the GPRS module operate at 3.3V logic levels.The firmware uses STM32Cube HAL drivers and FreeRTOS.What I’ve Verified:The GPRS module was tested by connecting it directly to a PC using a USB-to-Serial converter, and it responds correctly to AT commands.I also performed a loopback test on UART2 (connecting TX to RX), and it worked as expected — transmitted data was received correctly.Issue Faced:However, when I connect the GPRS module to UART2 (TX to RX, RX to TX, GND to GND), I observe that:The UART2 interrupt triggers continuously, even when nothing is being sent.The receive buffer fills with random or garbage data.As a result, I’m unable to communicate with the GPRS module pr

Hello,I've configured my ADC channels in differential mode and I'm able to do some basic test by connecting variable supply to my ADC pins. The results are coming properly. Here I'm connecting directly to my Nucleo545REQ board. Now when I connect CT(Current transformer) lines with 100watt load to my Nucleo board ADC I don't see anything. Values are in the range of floating.Can someone help me if I need to do anything in firmware or do I need to have any change in hardware.