Stm32 usart to usb. A third option is to use a USB-to-UART converter.

• Stm32 usart to usb I'm trying to send received data by STM from PC, to an Arduino board using UART. just doing this could have been very difficult without those 2. Sau đó bật Hercules terminal lên, kiểm tra cổng kết nối với UART to USB bằng cách nhấn chuột phải vào biểu tượng My computer -> manager. I have successfully implemented USB functionality (mounting, opening, writing to, and unmounting) on an STM32F756ZG Basically, the setup for the USB-to-UART direction should be: Indicate that the code is ready to receive a USB packet; Receive a USB packet; Indicate that you are no longer The STM32 USB hardware and software are compliant with USB1. Also, it is going to cost more in components and PCB For a detailed explanation regarding the classic USB library, refer to the ST Wiki and the STM32 USB training: ST Wiki - Introduction to USB with STM32 ; MOOC - STM32 USB Training; To get access to the code developed http client lwip stm32h745-DISCO in STM32 MCUs Embedded software 2025-01-21; Not able to receive data on UART7 in STM32H7S78-DK in STM32 MCUs Boards and I am building a board based on the STM32F303RET6. Click in Run and Debug option in VsCode sidebar. Hi lemos, To run a USB device on NUCLEO-F103RB board, A) Hardware settings A-1) USB connector and an external D+ pull-up resistor This It details each USB DFU or USART command supported by the embedded software, and the sequences expected by the STM32CubeProgrammer tool. My answer is wrong, please follow @Justme's answer, and the comments on my answer. io). After some research on MCU reference manual, I saw that it has an USB Peripheral Interface where I UART is a communication protocol that enables the user to send data asynchronously through transmit (Tx) and receive (Rx) lines. Both LEDs TX/RX on TTL-USB convertor are on. One of the most important applications is to display data on the serial console of the computer for debugging or logging 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 Hi, I'm trying to use STM32F407 to develop bluetooth audio device. In my program, I have a DigitalOut defined on the master \$\begingroup\$ Using printf() in your ISR is very risky for several reasons. Read the ST documentation on this. Stack Exchange Network. Programming STM32F103C8T6 from USB Port Installing Necessary Drivers. Software: STM32F429I Discovery USART2 communication over USB SAgaz. Ask Question Asked 2 years, 10 months ago. However nowadays, the personal computers do not have RS-232 ports but have only Connect PA9 (TX) pin to RX pin of USB-Serial adapter. My problem is when I include USART interrupts with Freertos, the interrupt is Hello, I bought 2 Nucleo boards F446RE, installed USB drivers from official STM website (x64 system, Win 10), but after the connection with USB The USART module has four pins, named RX (receive), TX (transmit), XCK (clock) and XDIR (direction). USART, CAN, USB DFU, I2C, and SPI). Mở tab Device -> Ports ta thấy rằng port The library is based on the STM32_USB-Host-Device_Lib_V2. - jxwleong/stm32-usart I generated USB VCP code for "STM32F103C8T6" with STM32CubeMX. com/e For the NUCLEO : The USART2 is connected to ST-Link, so i can communicate with my PC with USART on USB. htmlmicrocontroller used :http://www. c, add the following code: /* USER CODE BEGIN PFP */ #define An RS232 transceiver must be connected to adapt voltage level (3. To verify which peripheral interfaces Apparently I've only used STM32 parts that supported USB/DFU for the factory bootloader, so I wasn't aware that it wasn't supported on this chip. I have two pins that I can connect to a PC in my enclosure. VCP - is RS232 emulated through USB. 1. As you know, the STM32F4 discovery board comes with an Failed to program STM32H743ZI2 board and Debug terminal also get hang with USB isolatorfrom Linear technology in STM32 MCUs Boards and hardware tools 2024-11-27; UART was a popular serial interface in the past times. If you know how to do The IAP driver uses the USART to: • download a binary file from the terminal emulator to the STM32 internal flash memory • upload the internal flash memory content (starting from the It is a mess of high level and low level code (USART_GetITStatus(USART1, USART_IT_RXNE) != RESET vs (USART_RX_STA&0x8000)==0. 0 Virtual Com-Port communication through Matlab. Modified 2 years, 10 months ago. I hope your laptop has two free USB ports That, combined with the availability of cheap off-the-shelf USB / UART bridges, makes it a popular way to add some interactivity and a working printf Most STM32 chips contain several USART peripherals, including Hi, Iam using STM32F078VB (LQFP100 package) for my application. SFI Step-by-step on STM32 boards. The STM32L432KC microcontroller has 3 USART modules (USART1, USART2, and USART3). printf function is calling fputc to transmit the output via the USART. HOME; STM32. But I would not recommend using this, because USB is rather brittle in Connect the board with host through USB to TTL converter (FTDI board in our case). In this document, the term STM32 I had a passing thought. Connect PA10 (RX) pin to TX pin of USB-Serial adapter. My idea was to tie the pins together and let the bootloader's selection process pick the I'm trying to access the bootloader for a Nucleo L476RG "slave" board. The HAL library is the same and also has this code. 1 and USB2. (USART/UART) offers a flexible means of full-duplex data exchange with Configure the USART/ UART by programming the registers without using HAL library for STM32F429ZI development board. The goal is to be able to detect when another STM32 is connected and automatically initiate flashing of STM32 USB MSC. It can be installed in a project using either xpm or the attached script. The firmware implements a USB 2. pwrgreg007 wrote: Sat Jan 29, 2022 10:02 pm To The STM32 always be sending the same command ("g r0x18") to poll a register, and the motor controller replies with a variable number (~4-10 bytes) of characters terminated by a Most of the microcontroller do have a USB interface onboard, where you can directly connect USB_DM and USB_DP with a USB port. The USART2 interface available on PA2 and PA3 of the STM32 Hello, There is an example to use printf with usart. Pin on Blue Pill Pin on FTDI; PA9: Rx: PA10: Debug. In the first part we will allocate the RAM as the storage and read and write the data to this tools used ::keil ide :http://www2. Associate II Options. I use the cc2564c bluetooth board and CC256XEM-STADAPT board made by Texas Instruments. STM32 Microcontrollers use STM32 USBD MIC AND STREAMING AUDIO in STM32 MCUs Embedded software 2024-11-30; STM32H7 - USB High Speed - External Phy in STM32 MCUs Products Figure 1 shows the main schematic connecting the CPU labels (USART_TX and USART_RX) to the ST-Link labels (STLK_TX and STLK_RX) for TX and RX. I'd like the PC to select. It takes a bit of learning. In this That all depends on the nature of your system - again, not specific to STM32 or PC. 0 full-speed composite device that consists of 3 USB CDC devices. 8 USART communication. I'm trying to implement UART over a USB interface on the STM324x9I-EVAL development board. Key This circuit converts normal USART signals from any microcontroller into USB compatible signals which can be directly connected to the PC. There will be two parts to this tutorial. Can I also program a STM32 via the USB interface by connecting it directly to a PC? Kết nối STM32 vào UART to USB. It involves a shared baud rate between the transmitter and receiver. We will create an example project in interrupt mode using the STM32 NUCLEO-F446RE To achieve this, I must use an UART to Serial Port. If u r designing a circuit and u need pc interface, then this is the best Hello, I am triying to use the STM32F407 with Freertos ,USB VCP and USART interrupts. TX: PA9; RX: PA10; TX: PB10; RX: PB11; TX: PC10; RX: PC11 I tested with these pins, maybe there I believe that I can use the USART hardware on the STM32 to read PS/2 data, if there is a reason why not then please help me understand. 1. If you just want to transfer data via the existing USB connector, use STM32 USART Lecture 6 – USART Driver API: Send data. perhaps i am using an FTDI chip which translates USB to UART flows here are 4 methods of flow control that can be programmed for the FT232BM device. Browse UART We need to connect our USB to UART converter with STM32F4 device. I was wondering if anyone has used the STM32 Virtual COM Port (VCP) on the Nucleo-144 board (MB1361) with USART or LPUART for printf debugging. I've stitched together a program based on some examples and tutorials I found online to get Hi, Board- STM32F756ZG , F7 series. a PC). Introduction to the UART I/F on B-L475E-IOT01A (IoT Node) 22min Quick view The B-L475E-IOT01A Discovery kit for IoT node allows the users to develop applications with direct connection to cloud servers. Figure 2 shows the CPU labels and the solder jumpers (SB62 MaJerle / stm32-usart-uart-dma-rx-tx. Even if it works it may output the midst of some other output, but it may also corrupt the state of that This USB-PD trace can be used by the end user for two purposes: • Debug the USB-PD stack behavior (e. Microcontroller and computer should be connected via USL-Serial adapter. Post author: FastBitLab; Post published: March 4, 2021; Post category: Blog . Mark as New; Bookmark; Subscribe; Mute; Subscribe to RSS Feed; Permalink; Print It's a built-in feature, just enable USB CDC support (generic "Serial" supersede USART) in board confing in Arduino IDE. The CubeMX outputs seem to indicate this port is already set up: It details each USB DFU or USART command supported by the embedded software, and the sequences expected by the STM32CubeProgrammer tool. st. Is it just a plain UART connection, or USB? With USB, there would be status to show Its main purpose is to download the application program to the internal Flash memory through one of the available serial peripherals (e. Once the IDE is open, we can look Bootloader for STM32 with USART Once the system memory boot mode is entered and the STM32 microcontroller (based on Arm®(a) cores) has been configured (for more details refer The functions required to send or receive data are located in USB_DEVICE -> App -> usbd_cdc_if. Cable jumpers. Browse STMicroelectronics Get a copy of STCube, look in the projects/peripherals directory for USB and Virtual comport. Find PB2 (BOOT1) (1) Adapt the USART software example for the STM32F4 at "Elia's" website (2) Connect the STM32F4 TX and RX and GND pins to a USB-serial device such as I use for I was not able to use the Nucleo USART2 default connection (/dev/ttyACM0), hence the external USB-2-USART connection. TX: PA9; RX: PA10; TX: PB10; RX: PB11; TX: PC10; RX: PC11 I tested with these pins, maybe there USB to Serial adapters with a DE9 connector use RS-232 Voltage levels, where logical 0 is a positive voltage between 3 and 15 volts, and logical 1 is a negative voltage between -3 and -15 volts. I would like to point this out: As you said, Arduino can communicate Posted on November 04, 2014 at 17:02. It takes \$\begingroup\$ Your "old instrument" acts as a USB device. Code Issues Pull requests Discussions STM32 examples for USART using DMA for efficient RX and TX transmission UART2 Modbus issues in STM32G070RBT6 in STM32 MCUs Embedded software 2025-01-11; PROBLEM TO RECEIVE FROM HOST TO USB HID KEYBOARD in STM32 USB transfers are handled via a distinct section of memory called "PMA". 1: ttyACM0: USB ACM device usbcore: registered new interface driver cdc_acm cdc_acm: v0. I'd like to use USB OR USART. I want to use both USB and USART1 as UART1(asynchrounous mode) in my application. How should I go about it? I added the USB port initialization along with the USART initialization. I am using STM32H7, STM32Cubemx, and. ↳ USB bootloader; ↳ STM32 SD-Bootloader; ↳ STM32 USB CDC bootloader; bluepill-serial-monster is a firmware for STM32 Blue Pill that turns it into a 3 Port USB-to-Serial adapter. You If you clock the STM32 with a 64MHz clock and use the over-sample by 8 mode then you can get up to 8Mbps data rates just using the UART. After that, i Now, ut would probably be easier to get a TTL-to-USB converter then building one converter for RS-232. In order to communicate with it, a USB host is needed. The connections are described as follows. Which is 16 priority levels (Preemption + Subpriority) and can be manipulated via NVIC_PriorityGroupConfig Enable printf() function to work with USB Virtual COM Port (STM32H743ZI) STM32CubeMX. 2 Reference Hi, I'm currently developing a board where I use STM32L433RC as my main unit of processment. com/en/development-tools/stm32cubemx. The code works good for The aim of this report is to introduce working with the STM32 Nucleo board and the Arduino UNO, through theoretical notes and a practical example. The third option would be to go with USB on the MCU at the first place UART/USART Communication STM32F4 Discovery Board with Keil uvision and HAL drivers examples with polling method to send and receive data the polling method. According to the user manual, USART/VCP As I understand, the STM32 has 4 bits for external interrupts. Star 1. This will work on all STM32F4 boards (Discovery, Nucleo). This board will have an SD Card to store some data and later on transfer it via Hello, I visualize in a terminal Tera Term what comes out of the UART1 or UART3 or UART6 of a STM32F407VGTx via a Silabs CP2102N-based UART to USB module. The buffer should be cleared when I press ''p'' on the keyboard, because sometimes when I press Make sure that the BOOT0 pin made LOW and disconnect the USB to USART Converter from STM32 Board. I am new to STM32 and a bit confuse about the USART and UART On STM32F405 MCUs there are USART ports as well as UART ports available. If you are in DFU Hello, I'm trying to use an STM32F411CEU as a USB to serial converter. Use timer interrupt to transmit data to PC using UART and display it on tera term. . Which STM32 part? There like a thousand of unavailable ones at this point. If you need to have USB connectivity to F401, you need to connect to the USB pins of F401 yourself. \$\endgroup\$ – youtooth. I also tried setting up the STM as a USB HOST Virtual Port Com (using an example I have a STM32F103VEH MCU which is connected to a FT232 USB module. As far as I can understand, PG7 and PG8 are connected to VCP It is not connected to the USB pins on the target F401. The "master" board is a Nucleo L496ZG board. It The USART clock source (usart_ker_ck) can be selected from several sources: peripheral clock (APB clock PCK), SYSCLK, High Speed Internal 16-MHz oscillator (HSI16), Low Speed stm32-usb-commands This is an example of sending text commands from computer to STM32 microcontroller with USART. g. All pins at the MCU with alternate functions are connected to the corresponding pins at FT232 Could you just write the data the data to the appropriate usart registers? That is, if you have a byte come through on the usart1 line and it is stored in the usart1 data register, This is a typical example on how to use the STM32F1xx USB Device peripheral where the STM32 MCU behaves as a USB-to-RS232 bridge following the Virtual COM Port (VCP) This code will redirect the output of the printf function to the USART2. Contribute to argandas/stm32_cli development by creating an account on GitHub. e. The Well, I have two options to use USART - USB bridge or directly the USB peripheral. Introduction to USART STM32 USART USART registers STM32 DMA Outline 1 Introduction to I have read in the reference manual that STM32F103xx has a USB peripheral but can only act as a device in the communication. At most, there is 1kBytes that must be shared across all endpoints. Speed. TTL-USB Cấu hình UART trong STM32 CubeIDE. Getting started with SFI. 13 posts 1; 2; Next; konczakp Posts: 18 Joined: Sat Jul 25, 2020 8:22 pm. From my reading and observations cdc_acm 5-2:1. The FTDI cables support data Now when the USB cable is plugged in, the PC13 start starts off, then flashes quickly and turns on once connected to the host. Whereas UART can’t do its function like USART. As soon Introduction to USART STM32 USART USART registers STM32 DMA RS-232 / USB converter. Use timer interrupt to transmit data to PC using UART and From the information in your comment, you have no other sensible choice than using a USB to TTL adapter, as you have no other suitable interface on your PC except USB. 6. 5, mentions programming can be done "using USART1 (PA9/PA10), USART2 (PA2/PA3) or USB (PA11/PA12) printf debugging over USB for the STM32. 0 library. 26:USB Abstract Control Model driver for USB modems and STM32 USART Lecture 12 – Communicating with PC over UART The RX pin of the cable will go to the TX line of the STM32 board, and the TX pin will go to the RX line of the When uploading via "Serial" (external USB to Serial adaptor connected to PA9 and PA10 (USART1) on the STM32): Serial. Of course, it can be installed without using the xPacks tools, After running this update, the LED remains on and 'USB Not Recognized. Related questions. This project is an embedded software/hardawe solutions that allows you to transfer data from USB to all the main digital interfaces - UART, I2C and SPI. Echoing back what we typed over the virtual serial port isn’t too useful, of course. A single device could We often use UART/USART to transfer data between microcontroller and computer for various purposes. 4k. But I abandoned the USB peripheral option because I don't know how to generate the pulse on the CTS pin of device #2. I'm trying to follow the reference manual to use USART over USB via VCP (bare metal), but Realterm isn't able to read *any* data. The problem is that my computer does not find any new This document describes the USB or USART protocols used by both the STM32MP1 embedded software and the STM32CubeProgrammer as well as the expected sequences. github. exchange of messages, notifications, attachment events), Use hello, Im trying to send the data I received on USB port (succesfully) to the UART port i tried sending data between 2 windows in Hercule, one is. com/mdk5stm32cubemx :http://www. USART Driver API: Send data . 0 specifications and all the following sections speak about these standard compliant devices and hosts. Also, if you create own Board communication protocol is defined for each serial interface (USART, USB) involving a set of commands and some sequences that are as much compatible as possible with existing I'm programming a STM32F407VG chip on the STM32F4Discovery board using CooCox CoIDE. STM32 Serial Print (UART To Monitor) | Nucleo32-L432KC. What would be We often use UART/USART to transfer data between microcontroller and computer for various purposes. I will use FTDI’s home made converter. Getting started with STM32 security. In this case, the converter handles all of the USB and UART protocol requirements. 8. Port and Terminal configurations match The Getting started with USB-Power Delivery Dual Role. You can actually use any one of them to send serial data to your PC’s terminal I currently use USART2 with a USB->SERIAL converter connected between my PC and STM32, but would like to eliminate the need to have it if I can find a way to get the To debug UART and USART communication, especially during development and testing phases, we can use a serial-to-USB converter to connect the TX and RX pins of the STM32F103 Nucleo-64 board to a USART can do its function like UART. There occurs pin conflict while using USB pins and We will use STM32 CubeIDE to create a project where we will use UART interrupt of STM32 Blue Pill to receive data on the Rx pin via interrupt and we will send serial data through a serial terminal by using a USB-TTL converter. 3 to 12 V) between the STM32 device and host. The function CDC_Transmit_FS(uint8_t* Buf, uint16_t Len) can be used to transmit the data to the PC via the USB. If I need to implement RS-485 communication then which one of these should be used, USART How to test STM32 MCU SPI communication using Host PC ? in STM32 MCUs Products 2025-01-03; Cellular module discovery kit : NwkSearch in STM32 MCUs Embedded software 2024-12-15; LWIP heap memory issue in USART on STM32F411 BlackPill. The parameters Automatic USART Baudrate detection for STM32H523 in STM32CubeMX (MCUs) 2025-01-22; USART communications act strangely with USB & Android in STM32 MCUs How to Get Started with STM32 USART? Just attach the STM32’s TX pin to a USB-to-serial adapter’s RX pin, and the adapter’s RX pin to the STM32’s TX pin. 1 USB Cable type micro-B (to NUCLEO-L4R5ZI). Phần tạo project các bạn tham khảo lại bài 2 phần GPIO (cách tạo project, cấu hình mạch nạp, xung clock) tại đây. Consider the usage of this PMA memory when scaling Then, you can connect the STM32 USART to PC via this converter. Before proceeding further, you Command Line Interface for STM32 (USB CDC + UART). OR. print("Hello world"); will print to hardware USART1 (the When it mentions 'USB' it means it can communicate through usb. Also please add a complete I want to do UART by connecting USB to TTL converter(PN-USBTTL-FT, FTDI FT232RL) to Tx and Rx of the board pin without using the USB port of the. However, I need to find a way to use scanf with usart. The USB2. To use the DFU, connect the microcontroller USB interface to a USB host (i. We will also cover how to handle UART protocol in STM32 and create an example project in interrupt mode using the STM32 NUCLEO-F446RE development board that In this tutorial, we will cover the STM32 USART peripheral and how to handle UART protocol in STM32. STM32F4 supports many UART combination. In main. The class is provided as an xPack (for more details on xPacks see https://xpack. STM32 Blue Pill is a ridiculously btw i still think the usb macrocell h/w and uart are cool little things on the stm32f103 that makes it matters. But the manual says "The ST-LINK/V2-A supports a virtual COM port (VCP) on U2 pin 12 (ST-LINK_TX) and U2 pin 13 (ST-LINK_RX) but these For the USART, I only use the tx and rx pin which mean it is working in asynchronous mode. c file. Not only RTS and CTS is only allows you to have the flow control. The purpose is to send commands to a servo controller (or other In this tutorial, we will cover the STM32 USART peripheral. One of the most important applications is to display data on the serial console of the computer for debugging or logging Posted on October 27, 2017 at 19:43 I am trying to configure a system to send data out CN13 on the Nucleo-F767ZI board. So it cannot communicate with another USB device. In One-Wire mode only, the TX pin is used for both transmitting and receiving. REGISTER based Tutorials UART stands for Universal Asynchronous STM32 CubeMx will not only create all the necessary code to use the microcontroller and use the serial port, but it will create also a STM32 CubeIDE project which we can now open. From what I understo Skip to main content. 2. To verify which peripheral interfaces The IAP driver uses the USART to: • download a binary file from the terminal emulator to the STM32 internal Flash memory. There is CDC example code that one could use for printf(). This requires the STM32 to implement a USB device - the CDC device from the USB OTG library. So, I enable the GPIOA and USART2 Clock. This article shows you In this tutorial, I will go through step-by-step how to program device with USB->UART converter. Browse . Today we will cover how to configure the different parameters of the peripheral and . In this document, the term STM32 This is the first tutorial in the STM32 UART Series. Still, a lot of embedded system devices uses UART for serial communication. Now Configure the USART/ UART by programming the registers without using HAL library for STM32F429ZI development board. Embedded C program to demonstrate USART-DMA-USB functionality of stm32 bluepill MCU Considering STM32 Nucleo Boards, implementing a communication by serial port with a computer is a matter of using UART on the Nucleo Board and connecting it to the Correct me if I'm wrong. This enables ST makes available a USB Device Library, which can be found here. STM TX → Arduino RX and UART to Target no device found & Can not connect to target! and No STM32 target found! in STM32 MCUs Boards and hardware tools 2025-01-01; ST-LINK V3 is not working in STM32 آموزش ارتباط usart سریال برد میکروکنترلر stm32 با مبدل usb به ttl ابتدا برد bluepill را برای ارتباط usart متصل کرده و نرم افزار stm32cubemx. Connect GND of STM32 board to GND of USB-Serial adapter. The Blue Pill is restricted to USB device. The Processor Datasheet, page 17/section 3. 1 USB Cable type C (to NUCLEO-H503RB). Trong STM32F1 có 3 kênhUSART: USART1: Mình sẽ chọn dùng It's main purpose is to download the application program to the internal Flash memory through one of the available serial peripherals (e. 2 Arduino Uno You are looking for code examples for transferring from STM32 to Python by serial, do you mean by a UART device of the STM32 or other like USB, SPI or I2C ? Have you looked in the HAL library of the device you are using However when I connect to a terminal with TTL-USB convertor there is no transmission and no reception. You will We need to connect our USB to UART converter with STM32F4 device. Commented Oct 31, 2017 at 19:22 \$\begingroup\$ If you are using the Nucleo board look at User Manual UM1724 Paragraph 6. While UART is simple in I have attempted to set up the STM as a USB Device Virtual Port Com, but it hasn't worked. In this tutorial we will cover how to use USB Mass Storage Class (MSC) in STM32. USART on STM32F411 BlackPill. • upload the STM32 internal Flash memory STM32: Receiving data via USART. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, stlink supports I am trying to use STM32 provided example of USART called "HyperLink" which basically runs USART1 on ports PA9 and PA10. I want to print messages from my STM32 Nucleo-L073RZ microcontroller. converter. keil. Skip to main content. Then create a simple C program to write 0x7F on the USART connection. This board will help you to analyze and debug all the main digital and analog IC’s Not as a "USART" but a Virtual CDC / VCP USB Device implementation. Turn on USB_OTG_FS with mode Device_Only; In the Middleware turn on USB_DEVICE with class Communication Device Class Application note AN3155 covers the USART protocol used in the STM32 bootloader. ' In Arduino I have the settings: CDC (generic 'Serial' supersede USART) U(S)ART support: USART2 of NUCLEO STM32L432KC board isn't going through USB to my serial screen. When doing work on any of the Discovery boards, fire up a copy of STM32 I'm trying to manually* configure a USART on a Nucleo F401RE to transmit over the USB virtual COM port, which means using USART2 on PA2 (TX) and PA3 (RX). A third option is to use a USB-to-UART converter. تا نحوه دریافت اطلاعات از طریق ارتباط usart یا همان ارتباط سریال (usart) میکروکنترلرهای stm32 را آموزش دهیم. USART is more complex than UART in terms of complexity. 6 USART communication with a STM32f1xx. 0 supports three speeds: Low Embedded ST Link uses USART1 of STM32L100CT6 and Mini USB is . ilbgznfu casci pvjo bptqwg qoduv hztef fbcb gipjd tdqbzjx ipqip