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Hi,We are using NFC reader IC: CR95HF using uart communication with our micro-controller.We are using external antenna for antenna, Is there any way to detect NFC antenna is connected to CR95HF ?Thank you in advance,Jignesh Patel

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I have a STM8/128-MCKIT motor control starter kit. I am following hardware configuration specifications, but I keep getting the 'Under Voltage' fault. I am using the default BLDC motor and board configuration with an external power supply. Thanks ahead of time for any assistance. If there is any extra documentation for this device, that would be great. A video showing the setup process would also be great.

Hi,I am working on linux kernel v4.19 to bring up the cr95hf via SPI, there is a existing driver called st95hf, I enabled it, and it can be probed. can get ECHO back. when I used nfc neard to test the driver, it always gives errors like below:[ 501.027260] spi_geni 988000.spi: Zero length transfer[ 501.027307] st95hf spi1.0: SPI transfer failed: -22[ 501.027393] spi_master spi1: failed to transfer one message from queue[ 501.027436] st95hf spi1.0: spi_recv_resp, data read error = -22[ 501.027471] st95hf spi1.0: spi error from st95hf_spi_recv_response(), err = 0xffffffea[ 501.027506] nfc nfc0: protocol sel send field off, err = 0xffffffea[ 501.036499] digital: digital_in_configure_hw: in_configure_hw failed: -22[ 501.037971] spi_geni 988000.spi: Zero length transfer[ 501.038042] st95hf spi1.0: SPI transfer failed: -22[ 501.038181] spi_master spi1: failed to transfer one message from queue[ 501.038246] st95hf spi1.0: spi_recv_resp, d

Hi every oneI'm developing a project on STM32F746BGT6 custom board which will use USB port for store Data on USB key AND firmware updating purposes (In the Field updating), cause I am newbie on USB things, I am googling about firmware update through USB key but there is dozens of articles and videos about updating via SD card.My questions is: Is updating firmware through SD card and USB key the same as each other, In other words can I tailored SD card implementations to USB Key for updating via Flash drive?Based on my researches, It has to be a Bootloader for make the update possible in the Application, But my MCU suffers for lack of Flash space, Is it possible to put the bootloader (or maybe the part of main application) in the external flash section (with some linker file modifying)? (I am implementing QSPI protocol for External flash)I am completely out of ballpark in USB implementation, So is there some articles or examples for this purposes to help me better understanding of USB F

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Hi ~I've designed custom board of STM32MP157C. 1. I created my own device tree using CubeMX refer to the below article.   https://wiki.st.com/stm32mpu/wiki/How_to_create_your_board_device_tree2. I also created own machine refer to the below article.   https://wiki.st.com/stm32mpu/wiki/How_to_create_your_own_machine3. st-image-weston build was successful.4. so now, I want to modify the linux kernel device tree.   and I finded article below ..  https://wiki.st.com/stm32mpu/wiki/How_to_cross-compile_with_the_Distribution_Package  Run "devtool modify virtual/kernel" command.   workspace directory was created successfully.   but I can not find my device tree in path below.  ./workspace/sources/linux-stm32mp/arch/arm/boot/dts My device tree files placed at "layers/meta-st/meta-st-stm32mp-addons/mx".How to solve it ?Thanks.

Hi !I'm using the stm32l452RE mcu and I use the shutdown mode. I also use the watchdog (IWDG) to reset the system if an error occurs. This IWDG is set to 4s. When I go in shutdown mode, accordly to the docs, IWDG should be off because it is clocked with LSI which is off.Despite this, the device resets exactly after 4s.If I change IWDG to 10s, device reset after 10s. That's why I'm sure IWDG continues working even when my device goes in shutdown mode.The only thing I'm not sure is if I really enter in shutdown. Here below is what I do to enter in shutdown mode :HAL_PWR_EnableWakeUpPin(PWR_WAKEUP_PIN1_LOW); HAL_PWR_DisableWakeUpPin(PWR_WAKEUP_PIN1); /* Clear flag */ __HAL_PWR_CLEAR_FLAG(PWR_FLAG_SB); __HAL_PWR_CLEAR_FLAG(PWR_FLAG_WUF1); __HAL_PWR_CLEAR_FLAG(PWR_FLAG_WUFI); HAL_PWREx_EnterSHUTDOWNMode();For the IWDG set up, here is what I do :void MX_IWDG_Init(void) { hiwdg.Instance = IWDG; hiwdg.Init.Prescaler = IWDG_PRESCALER_32; hiwdg.Init.Window = IWDG_WINDOW_DISABLE; hiwdg.Init

Hello - just trying to make a sanity connection to AWS IOT, unsecured port 1883, but it fails with a very non-specific error like not connected. I changed the demo app to use unsecure port 1883 and it connects and successfully sends the MQTT messages to the mosquito as well as the hivemq test server. But when I plug in my AWS IOT endpoint for MQTT_BROKER_NAME it does not connect. Any hints or tips or tricks?On a side note, when I undefined the secure connect variables (NX_SECURE_ENABLE and NXD_MQTT_REQUIRE_TLS) there was a bit of work to do to make it compile (and thereby connect in unsecure mode). It was not a big deal, but it would be nice if it was already done for the sake of sanity for the MQTT / IOT newbie.

Here is the code: if (constx8 == 0) // calculate constants one time. { uint64_t num = (((uint64_t)(((uint32_t)(R21 + R22))) * VREFINT_CAL_VREF) * (*VREFINT_CAL_ADDR)) << 8; uint32_t denom = (uint32_t)4095 * R22; constx8 = (uint32_t)(num / denom); // 8 times actual value. if (isDebug(DEBUG_encoder_voltage_calc)) { char buf[150]; sprintf(buf,"Const calc: num: %llu, denom: %lu, constx8: %lu\r\n", num, denom, constx8); print_debug_str(buf); } }and it prints "Const calc: num: lu, denom: 2454134784, constx8: 2646"

I was using the preloaded demo for the STM32L476 Discovery board and everything was working, and then I followed the steps on the Getting started with STM32CubeL4 MCU Package user manual to try and run the first example. I followed the steps and once I uploaded the code nothing happened I pressed the reset button on the board, but then the LCD screen turned off and the preloaded demo is gone. The LD1 and LD2 still come on when the USB ST-Link is plugged in but nothing else happens and when I try and upload more code to it the LD1 flashed red and green but nothing else happens. I'm not sure if I accidentally got the board in standby mode or shutdown mode or if there is something else. Is there any way to just reset the whole board back to its original form? Thank you!

I bought a second-hand stm32f429 discovery board, here is its image. I found 4 schematics on ST website (MB1075b~MB1075e), but I can't confirm which one corresponding to my discovery board. Accroding to the information shown on board , my board is DISC1. But on ST website DISC1's PCB is blue while mine is green, I'm not sure about my board's version.

Hi,I got a question about the design of the antenna for NFC. On my PCB, I'm copying the antenna that there is on the ANT7-T-M24SR. But the difference is that my PCB is 1.6mm of thickness (instead of 0.8mm of the dev board).Moreover, I've read (I think it was on that forum) that the value of L decrease of 0.4µH with a PCB of 1.6mm of thickness compared with a PCB of 0.8mm of thickness.So, how can I be sure that my antenna is well designed ?For now, I've added a capacitor in parallel of AC0/AC1 to adjust Ctuning if needed.I've found some information on edesign to design one layer antenna but nothing about two layers antenna. Where can I find some documentation about that ?Thank you in advance;Fabrice

Hi, I wanted to read and implement the secure boot on STM32MPU157C-DK2 board. But this page gives permission error. It seems that need to be fixed:wiki.st.com/stm32mpu/wiki/STM32MP15_secure_bootThanks.

Hi everyone,I just bought and received an ST-EVALMKI109V3 + ST-EVAL212V1 according to this webinar. All my software tools seem to be on the latest revisions.I updated the board with the last firmware using this videoMeanwhile I get this error that says it does not know the chip id when I select the MKI212V1 as shown in the screenshot above.I also joined the picture of both boards.Could anyone help me please on that weird issue ?Thanks in advance for your help.Best regardsThierry

Hello everyone once again, i am trying to split the main flash memory (just by using the .ld file) to put in each one a specific code (bootloader, DFU, app), i did what you can see in the image below, but i am not sure why the DFU and FLASH sections are not empty...do i left something else to do? They are not empty:Thanks in advance

Hi everybody,I'm working on NFC tag. I'm using a ANT7-T-M24SR deb board. This one communicates in I2C with an ESP32.First, I tried to read the dev board with a cellphone, and it worked well (URL : st.com)Then I tried to write "Hello world" in the NDEF memory of M24SR and it was written into the memory, and I succeded to read it (only one time) with my cell phone.So now, I have written another message, I think it's well writed into the memory (please see picture below) but I cannot read it with my cellphone.I have one question :After that I closed the I2C session, does I need to do something to reactivate the RF ? Because, by reading the System file, I see that the byte (offset = 0x0006) is sometimes at 0x09 (RF enabled) and sometimes at 0x00.I hope my resquest is enough clear, please find below the different questions/answers between µc and M24SR. 

The Flash of the chip can't be programmed. Mostly the error is that writing the first byte failed. But sometimes it is able to write a few bytes. It even worked like 3 times. The behavior is consistent over STM32CubeProgrammer and ST-Link Utility, and JTAG and SWD. There are some side effects:STM32CubeProgrammer does not report the Flash size correctly. It reports 1M instead of 515K, ST-Link Utility reports correctlyErasing the Flash does not always workSometimes the flash changes its content. Mostly switching between 2 or 3 valuesThank you for your help.

I want to follow the video (https://www.youtube.com/watch?v=Eg_GLvLHM1o&ab_channel=STMicroelectronics) to set up the SWV Viewer, but I am not able to configure the debug configuration, as it is grayed out (like in the picture) and then also the configuration in the SWV Viewers does not appear.I am using the following system: CubeMX v6.6.0CubeIDE v1.10.0STM32Cube FW_G0 v1.5.0Chip STM32G0xxDoes my chip even support this feature or why is it grayed out?

if (SW1Pressed_F && (!SW1ActionTaken_F)) {   DesiredSpeed = 10;    DesiredDirection = LEFT;   } if (SW1Pressed_F && (!SW1ActionTaken_F)) {   DesiredSpeed = 10;    DesiredDirection = LEFT;   }

We're working on a projekt with different µC and some so called "Common-Modules".These commons are located side by side our projects and shall simply been linked to these. All this could be done, but on building the project, we noticed, that no modules were built, if the include pathes were relative to the project file. Only if the path is given as an absolute path (for example like "C:\work\thiswork\module1\...") the compilation will be successfull.As the projects will be built local and on a remote server too, absolute paths are no choice for us.Are there any solutions to solve this?Best Regards

I use STM32H753 and USART1 with DMA to receive data of unknown length (Min: 8 bytes Max: 512 bytes) from PC. Data will be sent in burst after every one second. My baud rate is 9600. So approx 1ms per byte.So, maximum, I'm going to get all the data in 512 ms and I'm free to analyze the data for another 488 ms.So, I want some algorithm so that I can parse all data (Min: 8 bytes Max: 512 Bytes) on DMA after all data received.I am using follwoing methods.1) Receiving without DMA and interrupt on every byte.-> Working fine. But the more CPU interference required. 2) Receiving with Half and Full transfer interrupt with DMA.-> Working fine but sometime we need to wait for one second (or more than that, depending upon buffer size) till the filling the buffer (HALF or FULL). It makes the communication process slower.3) Receiving with DMA_CIRCULAR with DMA and keep eye on NDTR of DMA Stream.-> Working fine but sometime we get error because NDTR updates first after receiving data in

I'm trying to use printf with SWV.I'm using a nucleo-wl55jc1 board (stm32wl55). I have soldered SB8 to connect SWO to stlink.I have made all the config but the it doesn't show any trace.this is my setup:Create an empty STM32 project for the NUCLEO-WL55JC1Initialize all peripherals with their default configuration: NoIn CubeMX: Set Debug/Trace: JTAG and Trace: Trace asynchronous swCLK config:debug config:SWV settings:and i click on the red button after thatCODE:override write function:and then printf in main functionAnd ITM_sendchar(*ptr) is being executed, but no printf ouput in console.also i checked with the oscilloscope the signals while debugging : I can see that SWDIO and SWCLK toggle and SWO is at 3.3V

Hello,I would like to disable the LPUART in my project to save power consumption. I am programming a point to point network with LoRa modem. My project is based on the ping pong subghz example.Curently, my board consumes around 107 µA in sleep with the stop mode 2 enabled. I would like to reach a consumption in the range of 1 µA.I think the excessive consumption comes from the LPUART I use to debug. But when I disable the LPUART in CubeMX in the .ioc file and I generate the code, I get compilation errors in stm32_lpm_if.c with vcom_Resume function because usart_if.c does not exist yet.In fact in .ioc file in the subghz phy middleware section, in platform settings tab, the VCOM section is still present with USART Undefined and No solution. So is this middleware configurable without UART ?I am using a custom board with the LoRa E5 STM32WL5EJC module embedded and the STM32WL package.Thanks you in advanceRegardsEDIT : problem solved but I can't delete my post

 The same Part Number: L99DZ100GTR, but one part marking is L99DZ100G while another is L99DZ100G AA. What is the difference between them? Are they both commercial samples?