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I am testing the VL53L0X ability to accurately measuring the distance to objects of different materials and different sizes. The sensor is in continuous mode and I am using VL53L)X_GetRangingMeasurmentData to read the distance and reflectivity value. The parameter I am reading for distance is RangeMilliMeter and the parameter I am using for reflectivity is SignalRateRtnMegaCps. I have found that as the SignalRateRtnMegaCps value goes up the distance error increases. At 25�? the distance reading to a large sheet of brown cardboard is about 25.5�? and the reflectivity reading is 122,316. But at the same distance, the distance reading to a piece of white cardboard is about 35.3�? and the reflectivity value is 58,675. Are large distance errors to be expected as the reflectivity value goes down? Is there anything that can be done to reduce this error? Is it possible to use the Reflectivity reading to reduce this error? I see this question has bee

Hello, I have series of questions related to the data implementations using SPAD zone settings. After reading of manuals i made conclusions how to use this feature of the sensor, but i'm not sure if my conclusions are correct.1. I'm interested in accuracy of data returned by sensor in different zones. I tested all center zones started from 16x16 and reducing it to 4x4 size array. And each redusing gave me differense almost in 1.5cm, so the difference between value that retured in 16x16 case and 4x4 case equals 7-8cm! I had clear conditions of the experiment: sensor was fixed vertically in front of plane wall. I just wondered why the zones with the same center have such differents in output value.2. The second quastions is about if there any possobility to define geometric locations of the zones. User manuals said that 16x16 array has 27 FoV, 8x8 -20 FoV, 4x4-15 FoV. So i'm really wondered how those zones geometricly exists, because the reducing of the FoV is not uniform (if it was unif

Dear Sir/Madame, I am using X-NUCLEO-NFC03A1 connected to our MCU (NXP Kinetis). The communication protocol used is SPI and it works well (sends and receives echo). Therefore, we would like to read a text on the smartphone in "NDEF tag emulator" mode, but in the reponses indicate that the NDEF file is not found.Our goal is to deesign an access control with an NFC reader that is accesser with a smartphone application.The commands used are extracted using the datasheet, page 78-81, D.1.5 Forum Tag Type 4A, and it works well until the commands after "Select Application" because it responds 0x6A 0x82 (file or application not found). The Select application responds 0x90 0x00 0xF1 0x00, but if I change the command to >>> CR95HFDLL_SENDRECV, 02 00 A4040007D276000085010100 28, it responds 0xF2 (I understand that the timeW is exceeded and I put the maximum value 0x60).Could you please help us to solve this situation?Thanks you and Best regards,José Manuel.-

Hi together,I have ADC reading issues with my STM32G431. I read the ADC with DMA. The readings are triggered by a burst of pulses (approx. 750 kHz) and the ADC buffer seems to get filled. However, the ADC readings are way to high.A 2.5 voltage regulator is connected to VDDA. As you can see in the appended Scope-Screenshot the analog signal which I feed into the ADC (CH2) is lower than the reference voltage of the VDDA (CH1). The bursts of pulses is shown on CH3. But all the reading (except a few readings at the beginning and a few readings at the end) are 4095. So I do not understand why it is so. All the time the analog signal is below the ref signal. The settings of the ADC is appended as well. I hope you guys can help me. I am out of ideas how to fix my problem.

I have been using stspin32f0602 based on evspin32f0602s1. But the evaluation kit uses external opamp and comparator ic. I am looking for a way to use the internal opamp and comparator for amp measurements for easier hardware and inventory management. please help me with this​.

The new release 5.Y of the STM32 Motor Control Software Development Kit (X-CUBE-MCDSK) offers the new SW tool “STM32 MC Motor Pilot�? (real data log capabilities thru customizable interface), support AC Induction Motor and new 6-step control for BLDC motors (as FW example) and many other new features in the FW library (Discontinuous PWM, Single shunt phase shift, Overmodulation, Circle limitation V2 (replacing Legacy Circle limitation).The STM32 Motor Control SDK 5.Y is a step in between the current legacy version (v5.4.6 ) and the coming V6.0 (planned for beginning 2022).We use a “Y�? in the naming as FW library is closer to the coming STM32 MC SDK 6.0 while the STM32 Motor Control Workbench, the configurator tool (GUI), is identical with the one present in the STM32 MC SDK4.5.6 (legacy version). Both versions are available at: https://www.st.com/en/embedded-software/x-cDo not hesitate to visite our FAQ.

Hello, I am using the ST25R3916 reader. looking at the schematic of the filter and matching circuit I notice that the cutoff of the filter is lower than 13.5 M. I would like to double-check the L and C of the filter : 270 nH and 680 pF , thanks

Hello all,I am having severe issues trying to compile and getting to work a blink LED example on Simulink using the STM32-MAT/Target version 5.6.At first, I was trying the example on the hands on documentation of the STM32-MAT/Target. Which is blinking a LED using Timers 1, 6, and the pushbutton on my Nucleo board (Nucleo-F767ZI). I was using version 1.6.1 of the STM32CubeIDE, version 6.2 of STMCubeMX, MATLAB/Simulink version 2020B and windows 10.I wasn't able to create a .project file for the IDE until I downloaded Java version 8.45 which correctly linked everything together I assume. However, when it came to building the project, I was getting several errors about undeclared functions and variables that I wasn't able to figure out.I decided to look deeper into the documentation for the STM32-MAT/Target and looked at the last supported software for it (version 5.6 of CubeMX , 1.3 of CubeIDE, and MATLAB/Simulink 2018B). I rolled back the software to those versions thinking it might sol

We are evaluating ST25R3911B  using the X-NUCLEO-NFC05A1 board, with our custom IMX6 system. We have tried RFAL with the nfc_poller_st25r3911 example. Initially, no tag was found. We determined that the problem was our long IRQ handling. Since we had connected the IRQ to an IO expander rather than directly to the CPU, IRQ response time was about 2 ms, and no tag was found. Apparently this is due to overlapping IRQs. After connecting IRQ directly to the CPU, IRQ response time was about 0.2 ms and tags are correctly found. Is this a known issue or limitation? Can it be solved in software/RFAL, or is it necessary to use "fast" IRQ pins?

CubeIDE: 1.51, FW: H7_V1.8.0​In the experience of using the F4 series, there is no problem in setting the CDC mode. But this time, the H743BGTx MCU setting cannot be successful, and the computer USB is not listed. The USB initialization is successful without any error message, but there is no response.I also try other usb device type but same problem. (without error but no response.)​Does anyone know how to solve it?

Hi,I'm measuring a buffered voltage using injected conversions, triggered by a timer. I've limited the frequency of the ADC to F_adc < F_adc_hclk/4 as mentioned in the reference manual. When I use the synchronous clock (ADC_CLOCK_SYNC_PCLK_DIV4) I get some erratic measurements when compared to the asynchronous clock (ADC_CLOCK_ASYNC_DIV4). I find this to be strange as both my AHB clock and SYSCLK are running at the same frequency (160MHz).I would like to use the synchronous clock as this is recommended by ST when using timers as ADC trigger. Does anyone have an idea how to fix/circumvent this problem?

When I set the tx power as 25 dBm in the application what would be output tolerance. What would be the output power accuracy?We understand that tolerance resolution would be the parameter to drive the step size. RegardsPrabhu

I would like to get an clear answer about how I can support an eMMC Flash with FatFS on an STM32 (F4xx, F7xx, H7xx).It seems that STM32CubeMX doesn't want to generate a driver when the SDMMC controller is configured in MMC mode.Maybe there is another way outside of STM32Cube? Does ST provide necessary driver code to do that?

Dear Sir/Madame,I'm currently using ST25R95 for a design and I have a question from my software colleagues. Is the device capable of writing on Tags with a protected acess (by password for example)  ? We are using NFC TAGs Type 1.We would like to garantee that we can read and write the memory of the tags but without the possibility to copy what we are reading. We would like to ensure that no other reader than our can access to the memory of the tags.Thx in advance, Sincerely,S.T

Hello everyone,I just want to make sure that there is no OTP (one time programmable memory) in the STM32H745zi, I could not fine it in this device. Can someone confirm this?RegardsAlan

Hi,due to global shortage of MCU components we need to migrate our originally STM32G030K6 based application to alternative MCU. We have identified that following MCUs are compatible with original MCU (i.e when importing the configuration from STM32G030K6 to these listed MCUs no issues are reported by STM32CubeMX).STM32G030K8STM32G031K6STM32G031K8STM32G041K6STM32G041K8Based on RM0454 document (Reference manual for STM32G0x0 based MCUs) I assume that the binary compiled for STM32G030K6 can be programmed also to STM32G030K8 as the memory map seems to be identical. Is my assumption correct?The other listed MCUs are listed in the RM0444 document (Reference manual for STM32G0x1 based MCUs). This document lists the same memory map structure for the peripherals that we are using on the original STM32G030K6 MCU. Can I assume that the binary compiled for the STM32G030K6 MCU works also for STM32G0x1 based MCUs?

I've to count till 30ms, but i've to restart the count if a signal goes above a threshold. So i want to use analog watchdog as trigger source for the timer. I set up the timer in "slave reset mode" and with "ETR1 through ADC" as Trigger Source. I've also set ETR remap capabilities for TIM! in the correct way. The problem is that the timer never reset so it count to 30 ms every time. Anyone have any advice?Thanks, Marco

Hi,I have an STM32G0 with VBATT input for the RTC. When I restart the circuit, the time is reset.At the power On I write this instruction :  HAL_RTCEx_BKUPRead(&hrtc, RTC_BKP_DR1);Before of the Power Off :HAL_RTCEx_BKUPWrite(&hrtc, RTC_BKP_DR1, 0x32F2);Thanks for your Help.Pascal

Hello all,is there any example how to communicate with M7 and M4 in a STM32H745zi? Or any example how it is done communication with ST Cube would be great.Thanks in advanceAlan

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I'm running Ubuntu 18.04 and recently purchased the STEVAL-MKI109V3 motherboard and STEVAL-MKI207V1 adapter. I downloaded and successfully installed Unico STSW-MKI109L according to the user manual.In Unico, I select Device Type iNemo Intertial Modules, and from Device Name I select STEVAL-MKI207V1 and the Select Device button. When the popup dialog says "Port not open," I select ttyACM0 from the dropdown box (as shown by dmesg) and when I connect, the error dialog says:"ERROR: The board does not respond. The device selected might be not supported by the motherboard.Motherboard:       ProfiMEMSToolFirmware version:  V2.18.6Unico version:     9.9.0.0Device selected:   STEVAL-MKI207V1 (ISM330DHCX)Setdb command:   *setdb207v1Please check motherboard and firmware version.For firmware upgrade, please follow instructions on the motherboard user manual."The st.com website says the STEVAL-MKI207V

Hi,I'm working on STM32MP157A-DK1. By following this linkhttps://wiki.st.com/stm32mpu/wiki/STM32MP1_Distribution_Package tried building the image for STM32MP157A-DK1 but i facing the error ERROR: icu-66.1-r0 do_compile: oe_runmake failed during build. attached build log.i tried to resolve with the command "bitbake -c cleanall icu-native" and build still it fails. if i separately build "bitbake icu-native" it build fine but if i run command bitbake st-image-westonthe error comes up.

I have decided to implement my firmware in C++ on an STM32 Arm Cortex M4 microcontroller. However, I find it difficult to get started. I lack good examples and learning tools.Does anyone know good examples of firmware in C++?

Hello ST Community and Experts, I have an STM32STM32H745ZI and i have programmed it to send and receive some CAN messages from an other STM32 F446RE Nucleo Board. I would like to know if i can use STM32STM32H745ZI to connect to a different CAN Busnoperated at 24 Volts? I was unable to find the details in the technical specification regarding the above point. Thanks Krishna

I'm using a nucleo-f7 development board as the basis for a data logger. The logger is using three spi slaves with DMA to grab data streaming from a sensor suite and write it to a USB flash drive with occasional data headers. The problem I'm having is that I'm getting an occasional very long write time. I'm writing data from three separate A2Ds to three separate files. Normally the time it takes to f_write data to the USB flash drive is around 600 ms, but occasionally this will jump to 1800 ms. Currently, the system uses DMA TC interrupt that writes data from the smaller 4096 byte DMA buffer to a significantly larger 90 kilobyte circular "data buffer". I've made these data buffers as large as I can to help account for random write delays, but this occasional 1200 ms delay for a single modality is too much and will cause the system to overrun each data buffer. Here are the main functions that control the file system and controls the DMA buffer transfers. I'm hoping for some advice on lim