Stm32 usb virtual com port example

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�TourStart here for a quick overview of the site�Help CenterDetailed answers to any questions you might have�MetaDiscuss the workings and policies of this site�About UsLearn more about Stack Overflow the company�BusinessLearn more about hiring developers or posting ads with us Announcing Stack Stj32 DocumentationWe virtuql with Q&A. Technical documentation is next, and we need your help.Whether you're a beginner ivrtual an experienced developer, you can contribute.Sign up and start helping >Learn more about Documentation > I've found large number of examples but nothing on how to do it "properly" from STM32MXCube.How to create skeleton from MX St32 for Examole CDC Virtual Com Port communication (if possible stm32f4 discovery)? A CubeMX project for discovery f4 with CDC as USB device should work out of the box.

assuming you use up to date cube mx and librarystart CubeMXSelect the board discoveryf4enable peripheral UBS_OTG_FS device only (leave over stuff uncheck)enable midlleware USB_Device Commun . .aka CDCIn the clock tab check the clk source is HSE HCLK shall give 168MHz HLCK and 48MHz in the 48Mhz (usb) check no red anywhere.save stm23 code (i used SW4STM32 tolchains)build (you may need to switch to internal cdt buidler vs gnu make )Now Add some porf to send data over the com and voila it should work .Actualy the tricky part is not try to make any "cdc" access until host usb connect (no cdc setup yet)hers is how i did it for quick emit testin usbd_cdc_if.c uint8_t CDC_Transmit_FS(uint8_t* Buf, uint16_t Len){uint8_t result = USBD_OK;/* USER CODE BEGIN 7 */if( hUsbDevice_0 ==NULL)return -1;USBD_CDC_SetTxBuffer(hUsbDevice_0, Buf, Len);result = USBD_CDC_TransmitPacket(hUsbDevice_0);/* USER CODE END 7 */return result;}static int8_t CDC_DeInit_FS(void){/* USER CODE BEGIN 4 */hUsbDevice_0=NULL;return viirtual USER CODE END 4 */}in main.c /* USER CODE BEGIN Includes */#include "usbd_cdc_if.h"/* USER CODE END Includes */./* USER CODE BEGIN WHILE */while (1){/* USER CODE END WHILE *//* USER CODE BEGIN 3 */uint8_t HiMsg[]="hello ";CDC_Transmit_FS(HiMsg,strlen(HiMsg));HAL_Delay(200);}as soon you plug the micro USB (CN5) cdc data will start to show on host terminalThat work i virtula see hello on terminal (you may need to install driver https://www.st.com/web/en/catalog/tools/PF257938)For reception it need to be first armed say started by a first call to USBD_CDC_ReceivePacket on good place for that exaple be CDC_Init_FSthen you can handle data as it arrives in CDC_Receive_FSand rearming reception again from here.that work form me static int8_t CDC_Receive_FS (uint8_t* Buf, uint32_t *Len){/* USER CODE BEGIN 6 */USBD_CDC_ReceivePacket(hUsbDevice_0);return (USBD_OK);/* USER CODE END 6 */}static int8_t CDC_Init_FS(void){hUsbDevice_0 = &hUsbDeviceFS;/* USER CODE BEGIN 3 *//* Set Application Buffers */USBD_CDC_SetTxBuffer(hUsbDevice_0, UserTxBufferFS, 0);USBD_CDC_SetRxBuffer(hUsbDevice_0, UserRxBufferFS);USBD_CDC_ReceivePacket(hUsbDevice_0);return (USBD_OK);/* USER CODE END 3 */} I would ask, how should we use CDC_Receive_FS() in main.c if this function declare as static?

shame for ST there is no good example of VCP using Cube or at least HAL Libraries.� Arturas Aleksandrovas Jan 28 at 15:09 Your fix worked to remove the yellow warning mark.I would like to mention that USB_HS_MAX_PACKET_SIZE is now in usbd_def.h andCDC_DATA_HS_MAX_PACKET_SIZE is in usbd_cdc.hI am using STM32CubeMX v4.11.0 STM32Cube v1.0 and the STM32F401C-DISCOOn further work, I now only have to set heap size to a larger value.I am setting it to 0x600 as I also have FreeRTOS enabled.

I am using IAR EWARMso the change is made in linker script stm32f401xc_flash.icf There are a number of STM32F4 Discovery boards supported by the STM32Cube software and you haven�t said which you�re using, but I�ve had exactly the same issue with the Discovery board with the F401VCT MCU.After installing the STM virtual COM port driver, Windows Device Manager showed a STMicroelectronics Virtual COM Port, but with a yellow warning mark.

The COM port was exmple accessible with a terminal appliaction (PUTTY).I eventually found that there is a problem with source code output from the STMCube program. But there is a simple fix:� Open a new STM32Cube project and enable the USB_OTG_FS as DeviceOnly and select CDC Virtual Oprt Com (sic) from the MiddleWaresUSB_Device drop-down.� Generate the source code with no other changes needed to any USB settings.� In vortual usbd_cdc_if.c, change #define USB_HS_MAX_PACKET_SIZE from 512 to 256.� In file usbd_cdc.c, change the #define CDC_DATA_HS_MAX_PACKET_SIZE ussb 512 to 256.After doing this, the yellow warning disappeared from Virual Manager and I can receive data at the CDC_Receive_FS function (in usbd_cdc_if.c file) when using PUTTY.Be aware that these definitions return to their incorrect values each time the STM32Cube generates code and I haven�t found a way around this yet.I hope this helps. protected by Community � May firtual at 7:48Thank yo� Home� STM32F4/29 Discovery� Use with Keil uVision� Use with CooCox� STM32F4 links� All STD libraries� STD Libraries API� All HAL libraries� HAL Libraries API� ESP8266� All tutorials� About� CV English version� CV Slovenian version This library provides Virtual COM port on USB OTG.

This means, that you don�t need external Viirtual converter (like FTDI) to communicate with computer. STM32F4xx will be seen to computer like COM port.Library can be used on all STM32F4xx devices. It has also features to support STM32F4- and STM32F429 Exam;le boards.To use USB with HAL, check my HAL USB library. Library Features� Enables USB VCP� Works in USB FS mode� Default for STM32F4-Discovery board� Works in USB HS in FS mode� Default for STM32F429-Discovery board� Version 1.2 � March 08, 2015� Added options to detect if user xeample changed parameters in terminal (baudrate, stop bits, data bits, parity) in case you are doing USB<->UART converterDependencies� CMSIS� STM32F4xx� STM32F4xx RCC� STM32F4xx GPIO� STM32F4xx EXTI� MISC� TM� defines.h � USB� USB CDC device stack provided by STMicroelectronics (included in library)PinoutAs 2 options can be used, there are 2 pinouts: Eample ModeHS in FS ModeDescriptionData +PA12PB15USB Stm32 usb virtual com port example lineData virtul Data- lineIDPA10PB12USB ID pinVBUSPA9PB13USB activateNotes:� STM32F4-Discovery has micro USB connected to USB FS mode� STM32F429-Discovery has micro USB connected to USB HS in FS mode� If you have USB->4 wires cable, you can connect ub boards in both ways, but then you don�t have fancy connected.� Clock for STM32F429 was set down to 168MHz, because you can not get 48MHz for USB with 180MHz core clockBy default, library is set in FS mode, so pins PA11 and PA12 are virtua, use.

If you are working with STM32F429 Discovery board dtm32 you want to use xeample connector instead of wires on pinheaders, then open your defines.h file and activate USB HS in FS mode: #define USB_VCP_RECEIVE_BUFFER_LENGTH 128When you connect board to USB to computer, there will be new COMx seen.

For that, you also need USB VCP drivers provided by STMicroelectronics.Note: In your terminal are options to set baudrate, stop bits, etc. Leave that at it is, these settings don�t care, because everything is configured by USB. Precompiled�versionsSome users viftual issues with setting project (example below) correctly (don�t know why) and I have precompile long time ago 2 versions of examplee for F4-Disco and F429-Discovery boards. This is now available here for download.These examples has positive feedbacks as they work ok.Download here.

Functions and enumerationsI have written some basic functions to work with data. /*** @defgroup TM_USB_VCP_Typedefs* @brief Library Typedefs* @{*//*** @brief VCP Result Enumerations*/typedef enum {TM_USB_VCP_OK, /*!< Xtm32 ok */TM_USB_VCP_ERROR, /*!< An error occurred */TM_USB_VCP_RECEIVE_BUFFER_FULL, /*!< Receive buffer stm32 usb virtual com port example full */TM_USB_VCP_DATA_OK, /*!< Data OK */TM_USB_VCP_DATA_EMPTY, /*!< Data empty */TM_USB_VCP_NOT_CONNECTED, /*!< Not connected to PC */TM_USB_VCP_CONNECTED, /*!< Connected to PC */TM_USB_VCP_DEVICE_SUSPENDED, /*!< Device is suspended */TM_USB_VCP_DEVICE_RESUMED /*!< Device is resumed */} TM_USB_VCP_Result;/*** @brief Structure for USART if you are working USB/UART converter with STM32F4xx*/typedef struct {uint32_t Baudrate; /*!< Baudrate, which is set by user on terminal.Value is number of bits per second, for example: 115200 */uint8_t Stopbits; /*!< Stop bits, which is set by user on terminal.Possible values:- 0: 1 stop bit- 1: 1.5 stop bits- 2: 2 stop bits */uint8_t DataBits; /*!< Data bits, which is set by user on virthal values:- 5: 5 data bits- 6: 6 data bits- 7: 7 data bits- 8: 8 data bits- 9: 9 data bits */uint8_t Parity; /*!< Parity, which is set by user on terminal.Possible values:- 0: No parity- 1: Odd parity- 2: Even parity- 3: Mark parity- 4: Space parity */uint8_t Changed; /*!< When you check for settings in my function,this will be set to 1 if user has changed parameters,so you can reinitialize USART peripheral if you need to.

*/} TM_USB_VCP_Settings_t;/*** @}*//*** @defgroup TM_USB_VCP_Functions* @brief Library Functions* @{*//*** @brief Initializes USB VCP* @param Stm32 usb virtual com port example @retval TM_USB_VCP_OK*/TM_USB_VCP_Result TM_USB_VCP_Init(void);/*** @brief Reads settings from user* @note These settings are set in terminal on PC* @param *Settings: Pointer to TM_USB_VCP_Settings_t structure where to save data* @retval TM_USB_VCP_OK*/TM_USB_VCP_Result TM_USB_VCP_GetSettings(TM_USB_VCP_Settings_t* Settings);/*** @brief Gets received character from internal buffer* @param *c: pointer to store pprt character to* @retval Character status:* - TM_USB_VCP_DATA_OK: Character is valid inside *c_str* - TM_USB_VCP_DATA_EMPTY: No character in *c*/TM_USB_VCP_Result TM_USB_VCP_Getc(uint8_t* c);/*** @brief Puts character to USB VCP* @param c: character to send over USB* @retval TM_USB_VCP_OK*/TM_USB_VCP_Result TM_USB_VCP_Putc(volatile char c);/*** @brief Vrtual string frTheSTM32 USB-FS-Device development kit is a complete firmware and softwarepackage including examples and demos for all USB transfer types(control, interrupt, bulk and isochronous)Thefirmware is compatible with major IDE toolsets for ARM core-basedmicrocontrollers and offers consistency in naming and variable accessto facilitate development and code maintenance.� Device firmware upgrade ( DFU) demo: Control transfer� Joystick mouse demo: Interrupttransfer� Custom HID demo: Interrupt transfer� Mass storage demo: Bulk transfer� Virtual COM port: Interrupt and bulktransfer� USB voice speaker demo (USB speaker):Isochronous transfer� USB audio streaming demo: Isochronoustransfe The SW library for: STM32F105/7, STM32F2 and STM32F4 USB on-the-go Host and device library (UM1021) is here .STM32F10x, STM32L1xx and STM32F3xx USB full speed device library (UM0424) is here.STM32L Continua USB certified stack for medical applications is here.The documentation ishere. The demo proposal is to use the STM32evaluation board as a USB-to-USART bridge and to provide communicationbetween a laptop (without RS-232 port) and a standard PC workstation asshown below.The PC application used in thecommunication is Windows HyperTerminal.

See below.Remember to instal on your PC ueb Virtual COM Port Driver that is here.My version of Virtual COM is here.Go here and download the:USB-VirtualCom-for-STM3210B-EVALthat is my tested SW for STM3210B-EVAL, I con KEIL cpm Cannot modify header information - headers already sent by (output started at /home/httpd/vhosts/pezzino.ch/httpdocs/wp-content/themes/sparkling/header.php:12) in /home/httpd/vhosts/pezzino.ch/httpdocs/wp-content/themes/sparkling/header.php on line 23Stm32f3-discovery USB Virtual Com Port � embedded � experiments Skip to main content IntroWell, after having a complete build and debug environment set up, the ckm thing that I usually want to do is to attach the device to a PC.

In the past I always had a USART port, which Pory connect through a USB-to-serial adaptor, or a FTDI or equivalent chip on the board. This means that the coding on the device is really straightforward. For the first time I have a microcontroller with integrated USB capabilities and it happen that for me it doesn�t fulfils my requirements out of the box (no demo software for a VCOM on that particular board). This is frustrating, because serial communication is what I consider a basic thing, but in the end cm any problem it force you and allows you to dig into pot problem and learn a lot of useful and interesting thing about a new world.

References� USB� usb device classes� USB Complete: The Developer�s Guide is a very good overview off all the aspects. The host part is focused on Windows, but it is enough to understand the required mechanism.Online intro to USB� USB in a NutShell� usbmadesimpleTraffic monitoringUSB sniffing on Linux.Some blogs suggest to do the following:mount -t debugfs / /sys/kernel/debugAs stated in the wireshark doc this is only needed for old kernels:For versions of the kernel prior to 2.6.21, the only USB traffic capture mechanism available is a text-based mechanism that limits the total amount of data captured for each raw Virrtual block to about 30 bytes.

There is no way to change this without patching the kernel.Don�t do it with newer kernel, because you will end up with an unstable system and you will have to reboot.With newer kernels you only need to mount the usb monitor driver:modprobe usbmonExample of a mouse left click and release with a mouse:pezzino@samarcanda:~$ lsusbBus 001 Device 002: ID 8087:0024 Intel Corp.

Integrated Rate Matching HubBus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Virtjal 001 Device 001: ID comm Linux Foundation 2.0 root hubBus 002 Device sym32 ID 1d6b:0002 Linux Foundation 2.0 root hubBus 001 Device 003: ID 1bcf:288a Sunplus Innovation Technology Inc.Bus 002 Device 003: ID 046d:c06c Logitech, Inc. Optical Mousepezzino@samarcanda:~$ sudo cat /sys/kernel/debug/usb/usbmon/2uffff88010dd140c0 1341942814 C Ii:2:003:1 0:8 4 = 01000000ffff88010dd140c0 1341942885 S Ii:2:003:1 -115:8 4 wiresharkAccessing USB data without root privileges.�Runtime� hack:chmod o=rw /dev/usbmon*Definitive hack:sudo setcap 'CAP_NET_RAW+eip CAP_NET_ADMIN+eip CAP_DAC_OVERRIDE+eip' /usr/bin/dumpcapUSBExcerpt stolen from USB Xom The Developer�s Guide.Each endpoint has a number, a direction, and a maximum number of data bytes the endpoint can send or receive in a transaction.Each USB transfer consists of one or more transactions that can carry data to or from an endpoint.

A USB 2.0 transaction begins when the host sends a token packet on the bus. The token packet contains the target endpoint number and direction. An IN token packet requests a data packet from the endpoint. An OUT token packet precedes a data packet from the host. In addition to data, each data packet contains error-checking bits and a Packet ID (PID) with a data-sequencing value. Many transactions also have a handshake packet where the receiver of the data reports success or failure of the transaction.USB supports examplle transfer types: control, bulk, interrupt, and isochronous.

In a control transfer, the host sends a defined request to the device. On device attachment, the host uses control transfers to request a series of data structures called descriptors from the device. The descriptors provide information about the device�s capabilities and help the host decide what driver to assign to the device. Examlle class specification or vendor can also define requests.Every device must have endpoint zero configured as a control endpoint.

USB set up on stm32f3 ST USB librarySTM32_USB-FS-Device_Driver+-- inc� +-- usb_core.h� +-- usb_def.h� +-- usb_init.h� +-- exampoe +-- usb_lib.h� +-- usb_mem.h� +-- usb_regs.h� +-- usb_sil.h� L-- virtal src+-- usb_core.c+-- usb_init.c+-- usb_int.c+-- usb_mem.c+-- usb_regs.cL-- usb_sil.cThe projectI�ve started with the demo that ships with the board and tried to adapt it from an HID device to a virtual com port.

From STM32_USB-FS-Device_Lib_V4.0.0 VirtualComport_Loopback example project I�ve stolen some files.� usb_desc.h� usb_desc.c� usb_prop.h� usb_prop.c� usb_endp.cTheSTM32F103C8T6&STM32F407VG ��������� ������������ ��� �����. ���������� ������ ����� ��� ���� STM32.����������� ���������:vcp driver https://www.st.com/web/en/catalog/tool.���������� ����� https://alipromo.com/redirect/cpa/o/o3.������������ SWD https://alipromo.com/redirect/cpa/o/o3. The Communication Device Class (CDC) is used for implementing virtual communication ports.

This example demonstrates a bridge between a Virtual COM Port on the USB Host Computer usv an UART port on the evaluation board.The following picture shows an exemplary connection of the development board and the USB Host Computer. The Abstract.txt file contained in the Documentation group of the Project window gives you more information on the general setup and the available I/O on the development board.

Build the "USB Device Virtual COM" ProjectOpen the example project in MDK. The �Vision Project window should display a similar project structure: Typical Project Structure of an USB VCOM Example Source Files� VirtualCOM.c contains the main C function that initializes the board hardware and the USB Device Component. Furthermore, it contains the code that exchanges the data internally between the USB and the UART port.� The USBD_User_CDC_0.c is an adapted code template that implements all necessary file access functions.

Refer to CDC: Communication Device Class (ACM) for details about these template functions.You may now build and download the example project to the evaluation board using the �Vision commands:� Project �> Build target (F7)� Flash �> Download (F8)After isb steps, the project should start executing on your evaluation kit.

Sfm32 case of errors, refer to the Evaluation Board User's Guide for configuration information. Using the "USB Device Virtual COM" Project Hardware SetupThe setup of the Evaluation Board hardware is described in the Abstract.txt file.� Verify all jumper settings on the target hardware.� Connect the UART on the development board to your PC (you might need an USB to serial RS232 adapter).

Use an USB cable to connect your development board to the Host PC and power up your board.� Virtuao Welcome to the Found New Hardware Wizard appears. Installation of the driver is described in detail in the Abstract.txt file.PC SoftwareThe USB Device Virtual COM example can be tested on a Windows PC using a terminal emulation st32. Since Hyperterminal in not part of Windows any more, please download an appropriate program for this purpose (such as PuTTY for example).

Open the two COM ports "COMx" and "COMy". Any data from "COMx" will be echoed on "COMy" and visa exzmple Virtual Com Port example doesn't work on device modeI have a uC card wtih stm32f107 which works host and FS mode, reads Flash disc. Now I am trying eval vcp example, I made ckm changes but it doesnt work even I put break points on main and systick. Something is wrong about VCP example with CL devices.My other question does VBus virtua, to be open manually for device mode?

Because on host mode we read flash disc by "USBH_USR_MSC_Application" event.Tags: usb vcpShare Post HiIt is unclear what you are trying to do."I have a uC card wtih stm32f107 which works host and FS mode, readsFlash disc. Now I am trying eval vcp example, I made necessary changesbut it doesnt work"The USB host example you have got is a USB Mass Storage device Stm32 usb virtual com port example Virtual Com Port" is the host (as in PC) driver for a USB CDC device.If you want to use USB serial exakple this is USB Communication Device Class.There is an example of USB device type CDC.This is a 'USB device' NOT a 'USB host'It is NOT possible to be both a Host and Device on the same USB peripheral.(Some other have been toying with doing both but on the 2 separate USB peripherals)Looking in the STM32_USB_HOST_Library directory for the USB example libraries, I do not see a Host example for a VCP.I do not know how you would adapt the MSC example into a VCP. I am trying cdc example on my card I have connect RS232 with hyperterminal it works I can see data i send.

But my card has a female usb socket. So to connect pc I find a male to male usb cable and plugged my pc. But I guess I need a virtual host for usb. Hyperterminal cant open a usb port thank you Hi"But I guess I need a virtual exampld for usb."Yes, you will need a VCP driver for windows which then makes a USB CDC look like a serial port.This is the one to use for ST parts:https://www.st.com/web/en/catalog/tools/PF257938You can poet use any terminal emulator you like HiUse Windows 'Device Manager'.Under 'Ports (COM & Ccom the driver is installed correctly, USB device enumerated correctly, it should be listed as a COM port (my gets listed as "STMicroelectronics Virtual COM Port (COM4)).(Sometimes the port number is large eg COM15 - it depends on how many COM devices the machine has seen!)In Hyperterminal - open that COM port.

If Hyperterm cannot select that port (I think it is limited to 4) - use another terminal program. HiWindows 'Device Manager'.Under 'Ports (COM & LPT)Should list all the available comm ports."After I install driver before I plug usb should i seee STMicroelectronics COM under device manager>COM&LPT?

"No.It should only appear after a USB CDC device is plugged in and correctly enumerates/installs."because I have no eval board just I am using its sw. thx"Only valid enumerated 'USB CDC devices' will be listed in the DeviceManager-Ports. Show Quoted MessagesShare PostSticky Discussion/_layouts/images/ST/MySTForums/StickyPost.PNGjavascript:window= '{SiteUrl}/_layouts/st/mystforum/stickypost.aspx?ItemId={ItemId}&ListId={ListId}&Source=' + window0x00x8List108110Edit in Browser/_layouts/images/icxddoc.gif/public/STe2ecommunities/mcu/_layouts/formserver.aspx?XsnLocation={ItemUrl}&OpenIn=Browser0x00x1FileTypexsn255Edit in Browser/_layouts/images/icxddoc.gif/public/STe2ecommunities/mcu/_layouts/formserver.aspx?XmlLocation={ItemUrl}&OpenIn=Browser0x00x1ProgIdInfoPath.Document255Edit in Browser/_layouts/images/icxddoc.gif/public/STe2ecommunities/mcu/_layouts/formserver.aspx?XmlLocation={ItemUrl}&OpenIn=Browser0x00x1ProgIdInfoPath.Document.2255Edit in Browser/_layouts/images/icxddoc.gif/public/STe2ecommunities/mcu/_layouts/formserver.aspx?XmlLocation={ItemUrl}&OpenIn=Browser0x00x1ProgIdInfoPath.Document.3255Edit in Browser/_layouts/images/icxddoc.gif/public/STe2ecommunities/mcu/_layouts/formserver.aspx?XmlLocation={ItemUrl}&OpenIn=Browser0x00x1ProgIdInfoPath.Document.4255View in Web Browser/_layouts/images/ichtmxls.gif/public/STe2ecommunities/mcu/_layouts/xlviewer.aspx?listguid={ListId}&itemid={ItemId}&DefaultItemOpen=10x00x1FileTypexlsx255View in Web Browser/_layouts/images/ichtmxls.gif/public/STe2ecommunities/mcu/_layouts/xlviewer.aspx?listguid={ListId}&itemid={ItemId}&DefaultItemOpen=10x00x1FileTypexlsb255Snapshot in Excel/_layouts/images/ewr134.gif/public/STe2ecommunities/mcu/_layouts/xlviewer.aspx?listguid={ListId}&itemid={ItemId}&Snapshot=10x00x1FileTypexlsx256Snapshot ush Excel/_layouts/images/ewr134.gif/public/STe2ecommunities/mcu/_layouts/xlviewer.aspx?listguid={ListId}&itemid={ItemId}&Snapshot=10x00x1FileTypexlsb256 Hi AllUnfortunately stm3 URL invalid now.

I've tried uxb examples fromhttps://my.st.com/st-extranet-web-active/active/en/catalog/tools/PF258224but unsuccessfully also.Could you please help me with those examples?Thanks in advance I've got it! Thanks a lot!I'm sorry for stupid questions but I'm newbie in STM32 programming.

Butmay be do virtyal know why the target clock has been set up on 8 MHz in alldemo?Could I change it to standard 72 MHz?Thanks in advance Depends on what you mean, the 8 MHz in the Keil target dialog means very little. The HSI (high speed internal) in the F3 is 8 MHz, the crystals used in the Discovery series boards is usually 8 MHz, and many of the Eval boards have a 25 MHz crystal.The PLL setting, which you should find in system_stm32f3xx.c stm32 usb virtual com port example get you to 72 MHz for the processor, and a 1.5 divider should get 48 MHz for the USB peripheral.Share Post Hi Clive,I've ported the VCP to F3DISCOVERY board but the one problem fxample been raised - application has broken SWD.

As fact reprogramming (from Keil) and debug is impossible.I'm getting error "Cannot access target. Shutdown debug session" when I'm trying start the application in debug pkrt. And I'm getting "Internal communication error" for any other attempts. After it any other deals with board via ST-LINK cirtual impossible due to following error: Target DLL has been cancelled. Debugger aborted !But the application is working properly and board can be reprogrammed via ST-LINK utility.

On the other hand ST-STUDIO doesn't wok also.How I can fix it? I have suspicion that application is using the wrong USB but I don't know how it can be checked.Thanks in advanceFrom: clive1Posted: Monday, Porh 20, 2014 9:42 PMSubject: STM32F3DISCOVERY Pory CDC (Virtual COM port) Example how do I port to stm32f3 discovery?

could you help me out with this?You look at the reference examples, and you adapt them to the specifics of the board you are using. If you don't know the differences, then start there.Share Post Good Morning. Thank you in advance for any advice.I would like to realize the communication USB CDC ( virtual com )the example set by St.creates the wtm32 device pirt the PC recognizes it. Stm23 how do I write in the virtual com port and send the data to my PC ? how do I read data coming back from the PC ?

I am a student of the University of Palermonovice with ARM. I can handle all of the board thanks to numerous examples given by ST. Except this communicationessential to con data udb my thesis. The alternative would implement UART and build a hardwar with max 232but I would avoidas poet card has the ability to communicate directly with the PC. Thanks in advance. The ideal sarebe to have an example of eco compossibly in keil . Show Quoted MessagesShare PostSticky Discussion/_layouts/images/ST/MySTForums/StickyPost.PNGjavascript:window= '{SiteUrl}/_layouts/st/mystforum/stickypost.aspx?ItemId={ItemId}&ListId={ListId}&Source=' + window0x00x8List108110Edit in Browser/_layouts/images/icxddoc.gif/public/STe2ecommunities/mcu/_layouts/formserver.aspx?XsnLocation={ItemUrl}&OpenIn=Browser0x00x1FileTypexsn255Edit in Browser/_layouts/images/icxddoc.gif/public/STe2ecommunities/mcu/_layouts/formserver.aspx?XmlLocation={ItemUrl}&OpenIn=Browser0x00x1ProgIdInfoPath.Document255Edit in Browser/_layouts/images/icxddoc.gif/public/STe2ecommunities/mcu/_layouts/formserver.aspx?XmlLocation={ItemUrl}&OpenIn=Browser0x00x1ProgIdInfoPath.Document.2255Edit in Browser/_layouts/images/icxddoc.gif/public/STe2ecommunities/mcu/_layouts/formserver.aspx?XmlLocation={ItemUrl}&OpenIn=Browser0x00x1ProgIdInfoPath.Document.3255Edit in Browser/_layouts/images/icxddoc.gif/public/STe2ecommunities/mcu/_layouts/formserver.aspx?XmlLocation={ItemUrl}&OpenIn=Browser0x00x1ProgIdInfoPath.Document.4255View in Web Browser/_layouts/images/ichtmxls.gif/public/STe2ecommunities/mcu/_layouts/xlviewer.aspx?listguid={ListId}&itemid={ItemId}&DefaultItemOpen=10x00x1FileTypexlsx255View in Web Browser/_layouts/images/ichtmxls.gif/public/STe2ecommunities/mcu/_layouts/xlviewer.aspx?listguid={ListId}&itemid={ItemId}&DefaultItemOpen=10x00x1FileTypexlsb255Snapshot in Excel/_layouts/images/ewr134.gif/public/STe2ecommunities/mcu/_layouts/xlviewer.aspx?listguid={ListId}&itemid={ItemId}&Snapshot=10x00x1FileTypexlsx256Snapshot in Excel/_layouts/images/ewr134.gif/public/STe2ecommunities/mcu/_layouts/xlviewer.aspx?listguid={ListId}&itemid={ItemId}&Snapshot=10x00x1FileTypexlsb256