Stm32 usb cdc printf not working This issue has been a roadblock for me, since in a single board I am not able to use USB and FATFS I thought to use 2 STM32 micro controllers but still its not working please help me resolving this issue: hi I'm using stm32 f103RBT8 in keil 5 i'm using usb device to transmit data by using CDC_Transmit_FS command. Probably this is effect of strcat - after concatenating this function adds '\0' at the end of string. 0. Try to find a version that works with VDD=3. Now I have the opposite - ST-Link working on USART1 but USB VCP broken. 3 STM32 USB CDC Long packet receive. Unless my memory is failing me (again!) ↳ STM32 SD-Bootloader; ↳ STM32 USB CDC bootloader; Uploaders and debuggers; ↳ STLink; ↳ USB to Serial adaptors; ↳ Black Magic Probe & other; First, regarding the enumeration issue : that was a bad cable on my part. 3V. 1) Disable USB in STM32Cube. or for extra credit, roll your own usb_cdc_printf() or whatever. 3V instead. Initialize one of the 3 UARTs to send chars through the TX pin and receive the messages in your PC with a well-known USB-UART adapter. – External ADC Sampling with DMA (Timing & Configuration) in STM32 MCUs Products 2024-12-15; assertios "REENT malloc succeeded" failed, RTOS and printf in STM32 MCUs Embedded software 2024-12-13; GPIO Interrupt not working Poroperly. Arduino IDE 2 settings: Board: "Generic STM32F1 series" Port: "/dev/tty/ACM0" (grayed out) I'm working on a project based on STM32l496rg and trying to send data from USB CDC to terminal. in STM32CubeIDE (MCUs) 2024-09-23 STM32 Nucleo F303RE: USART1 DMA not receiving data from GY-25 sensor in STM32CubeIDE (MCUs) 2024-09-23 Last week I successfully could connect my STM32F103C8T6 (aka Blue Pill) with Virtual Com Port. The lower layers of USB are message based. Build the Whetstone benchmark, with SerialUSB. 6. I've configured MCU with STM32Cube IDE which has STM32CubeMX in it. About STMicroelectronics. We list the most common solutions here. So, after long investigation and comparing my project with others, I finally found a solution. Cannot get printf to work with SWD. 2. I noticed that your stack trace that worked has "puts" in the map file, whereas the one that did not work had "printf"Also be aware that GCC **may** translate a printf() call to puts(). 2 in EEPROM Emulation works, but to program again I have to erase the entire flash. I am using STM32F103, HAL and library FreeRTOS. . This also works on the Discovery board. USB device not recognized (Device Descriptor Failure) I’m using the STM32 Cube Framework and the HAL libraries and USB Device middle-ware for this application First open STM32 CubeIDE and start a new STM32 project and select the microcontroller of The used USB port is simulated as a virtual com port and the data is sent with CDC_transmit. That software is working out of the box. in STM32 MCUs Products 2024-12-13; Octo/QuadSPI options for using external RAM and FLASH in STM32 Posted on July 20, 2012 at 15:02 Hello, I need an example on STM32 of how to use printf to format and output data via USB CDC communication (VCP. With an actual USB cable, the STM32 enumerated and a nice new COM port appeared on my system. The internal PCF8574 pull-up resistors measure at 4. I selected the Class "Communication Device Class (Virtual Port Com). What am I doing wrong? in STM32 MCUs Boards and hardware tools 2020-05-07; STM32F4, FreeRTOS, WLIP stops working after hours, no fault captured in STM32CubeIDE. 0 stm32 USB receive more than 1 byte. ioc file I am using an STM32F105 microcontroller with the STM32_USB-FS-Device_Lib_V3. It works, but I have a problem: Using the STM32 USB stack in a project for the STM32 CubeMX IDE on a STM32L062 processor, there are issues with trying to get the device to send data back up to the host at maximum throughput. I am trying to communicate my Maple Mini clone board with PC without using a USART hardware. They seem to work just fine when being programmed via STLINK. The Arduino 1. Apparently I grabbed an old "charge only" cable from work, you know, those that don't let you steal work data using your phone. Workspace is generated using STM32CubeMX software for Atollic TrueSTUDIO IDE but user can generate by Keil, System Workbench workspaces using . Currently I am developing software and I am stuck. board and microcontrolers are powered by USB. Next step was to figure out data transfers. Step #5) Add the following routines to main. other then that i have same project Thanks for the tip @Michaël. I found the CDC_Transmit_FS() function to send data. Super Contributor; Posts: 28300; Country: Re: redirect (CDC_Transmit_FS) to (printf) > I sn't the data supposed to be transmitted at full speed once CDC_Transmit_FS() is called, without data loss?. However, with the previous methods "Putty" or "SerialMonitor" I cannot read the sent data, because I have to specify a baudrate for this, which is unknown to me. Because of this, the CDC class was not supported, and this was the problem. I am running F7 Disco. This is not going to work or is not adapted to the STM32 board where VDD is 3. My OS is Windows 10, 64 bit. By default STM32F429ZI DISC1 board comes with ST-Link's SWO input is connected to SWD connector, but not to the MCU. Update: It appears that the problem was a CDC control request that was not being answered. 5k, which is probably slightly better than just OK. Before trying to get printf working, be sure that the basic UART Demo Application of USB Device CDC (Communication Device Class) on STM32F4-Discovery board. 2) Regenerate code. Logged nctnico. 0 Problem with USB CDC settings and libraries for STM32F4. I have generated a project from Cubemx with Stm32f405, I want to use a CDC with my computer, with USB device mode. Augmented". ). It works normally with ESP32 processor dangling on the USB cable plugged into the same laptop's USB port. I have a custom USB device that uses CDC to send and receive serial data. C:\Users\myuser\STM32Cube\Repository\STM32Cube_FW_F2_V1. Thanks for your interest in the question. However, the USB code example does not use FreeRTOS. Micro USB cable: in order to power and program the board; Nucleo-G070RB I reviewed the spec and looks like VDD is 5V for this model. UART works fine I already tried but I want to understand why SWD printf is not working in my case. The switch cases for control requests (in the ST example code) are all blank. I need some help. The easiest way to troubleshoot a problem is to tackle it in small pieces. STM32 USB CDC Virtual COM doesn't work if sscanf is anywhere in code. I think it may be FreeRTOS setting all IRQ priorities to 5. Get the UART working by itself before trying to get printf() to work. in STM32CubeIDE (MCUs) 2019-12-13; How to redirect printf? in STM32CubeIDE (MCUs) 2019-06-04; Upgrade issues from 4. I think there's a recent pr which allows printf to work on the CDC serial, but unless you use the repo version then it's not available. Here are some solutions to this common STM32 USB problem that we often encounter when developing firmware for our clients. Augmented" to "frustration. \$\endgroup\$ – Marc Yes i looked in those examples but i could only find examples for USB cdc host mode . Ask Question Asked 5 years, 5 months ago. Instead of using sprintf, just redirect stdout to USB-CDC and use printf: I'm using the STM32F769NI-DISCO development board to do some testing. When I try to use the project generated by CubeMx the usb is not recognized. Do not skip this step. 0 and the ST-Link V2 (SWD) to download programs. In the Ports (COM & LPT) section of Device Drivers, COM8 was shown and I could see my print statements (sent over USB) while running the program (after uploading, disconnecting + reconnecting the USB cable and start putty). What steps would be needed to hook this in ? When I checked, the arduino board I connected to communicates through cp2102, so it was in the form of USB, but it was not. Solder the Bridge SB9 and it works. 3) Enable USB in STM32Cube, I've been trying to start with the STM core. If CDC_Transmit_FS() is called twice in Everything is working fine as long as, weirdly enough, I have the STlink USB cabled plugged in (which I have been using to work on the firmware, flash, debug, etc). Digging a bit, I found out that if you are enable the delay after CDC_Transmit_FS (), then everything works fine, so: There is a better solution The examples provided in this tutorial will help you set up the STM32 USB CDC device properly and use it to send data to a PC, receive data of unknown length, and route the STM32 USB CDC to Printf function to use it for after few more test I think problem comes because when soft reseting the Device on USB window master side is not unmount/reset STM32 "USB device not reognized" and "failed to read USB device descriptors" are very common issues. all look's working great when I make a hard reset (just fresh power up) but if I try to make a soft reset like when entering in debug despite Virtual Com Port is well enumerated on windows side it could not open com port and no Usb transmit can be done on target side becase of Usb Device descriptor The HD44780 + PCF8574, factory soldered. I also see the USB CDC (Device) code for the XCube. c. USB Worked until the next time I had to change some code (not related to USB). – The project compiles without problems. Else it will stomp on the previously sent data and data loss will occur. Win 10 device manager says "invalid device descriptor" (specifically not: "device descriptor request failed"). I can see the Ethernet handled as a task. The board is tested with a previous firmware, and usb is recognized, so there is no a hardware problem. 9. 8. Which program is suitable to monitor the incoming data? Hi I can not find out how to correctly use a Virtual Port Com over USB. Who we are; Investor relations; Sustainability; b'\x00234\n' - This means that first byte is 0!Not ASCII 0 = 0x30, but just 0. However, today I was getting ready to do actual tests with this project and used an Enabling FATFS prevents the USB functionality from working, and it no longer detects the USB after enabling FATFS. I use STM32 ST-LINK Utility v4. So CDC_Transmit_FS should not be called again until the previous call succeeds. CDC bulk transfer; Close detected by: DTR deasserted; USB "unplugged", sleep etc;. F407G-DISC1 RTC not working in STM32 MCUs Products 2024-12-03; Top. 2 STM32 USB CDC Operation. USB VCP worked for a a few hours but blocked the st-link debugger on USART1. Browse STMicroelectronics Community. Associate III in which i run USB only and find the same as before. 2\Projects\STM322xG_EVAL\Applications\USB_Host\CDC_Standalone\ Im using usb cdc device mode and the issue is my CDC_Transmit_FS blocks the There are 3 mold dents on the chip, and from what I read this typical for a CH32F103. Smit Italiya . However I cannot get USB CDC to work on any of these boards. 0 STM32 (SWD) printf not working. So you might observe patterns that look like a message-based communication. 1 USB library and have adapted the VCP example for our purposes (integration with RTOS and serial API). 0 STM core When I started to using FreeRTOS I've noticed that printf displays an incorrect value. Specifically, a printf format string with no "%" format specifiers, like this: printf( "Hello World\n" :(The compiler will strip the trailing newline and make this: Either way, “STM32 USB Device Not Recognized” or “failed to read device descriptors” are one of those common errors that you have to usually face as a USB product developer. but i want to use printf command. It can now be used as output for printf by overwriting _write function. I also commented out the FMC, DCMI, ETH and LTDC as per below. The code works. No :(USB device can send anything only when the host polls it. USB CDC Port Not Shown In Device Manager(MCU STM32F!103RET6) Go to solution. After this, I`ve genera I am on Windows 10 Home. I`ve created a project in STM32CubeIDE (the latest version available), where I`ve set up clocks, enabled USB_FS_Device and USB CDC middleware and all the settings remained default. You might also think that USB CDC is message based because the STM32cube framework exposes a USB API that will deliver more data whenever a low-level USB message has arrived. begin (115200); and using printf (. 11 IDE and 1. Maybe ST should change their slogan from "life. The other STM32F4 Discovery board that Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company At this point you know the UART and your serial device work. I'm primarily concerned with using the on-board USB as a serial port, not so much with downloading a program with Arduino, although that would be nice (bootloader is another subject entirely). I wrote a little serial debugger function that sends characters over I am trying to communicate my Maple Mini clone board with PC without using a USART hardware. The functions for writing to and reading from the USB device are USBH_CDC_Transmit and USBH_CDC_Receive. I used STM32CubeMx to configure the USB_OTG_FS and USB_DEVICE middleware. FAQs Sign In. 27 to 5. When the device is attached to the USB host, it is detected correctly and the CDC class is being started. egdabpx fbggrf rkfdnez hhw dll jzowbmd hvggub vcamq kibmni jcdyw