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        • C
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      • PIC32
        • C
          • NECTO Studio
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        • Basic
          • mikroBasic PRO for PIC32
        • Pascal
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        • Additional Software
          • CODEGRIP WiFi license
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          • Visual TFT
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          • Package Manager
          • mikroBootloader
          • CAN calculator
          • GLCD Font Creator
          • Timer Calculator
          • MikroPlot
      • ARM
        • C
          • NECTO Studio
          • mikroC PRO for ARM
        • Basic
          • mikroBasic PRO for ARM
        • Pascal
          • mikroPascal PRO for ARM
        • Additional Software
          • CODEGRIP WiFi license
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          • Visual TFT
          • Visual TFT AI
          • Visual GLCD
          • Package Manager
          • mikroBootloader
          • CAN calculator
          • GLCD Font Creator
          • Timer Calculator
          • MikroPlot
      • AVR
        • C
          • NECTO Studio
          • mikroC PRO for AVR
        • Basic
          • mikroBasic PRO for AVR
        • Pascal
          • mikroPascal PRO for AVR
        • Additional Software
          • CODEGRIP WiFi license
          • CODEGRIP SSL license
          • Visual TFT
          • Visual GLCD
          • Package Manager
          • mikroBootloader
          • CAN calculator
          • GLCD Font Creator
          • Timer Calculator
          • MikroPlot
      • FT90x
        • C
          • mikroC PRO for FT90x
        • Basic
          • mikroBasic PRO for FT90x
        • Pascal
          • mikroPascal PRO for FT90x
        • Additional Software
          • CODEGRIP WiFi license
          • CODEGRIP SSL license
          • Visual TFT
          • Visual GLCD
          • Package Manager
          • mikroBootloader
          • CAN calculator
          • GLCD Font Creator
          • Timer Calculator
          • MikroPlot
      • 8051
        • C
          • mikroC PRO for 8051
        • Basic
          • mikroBasic PRO for 8051
        • Pascal
          • mikroPascal PRO for 8051
        • Additional Software
          • CODEGRIP WiFi license
          • CODEGRIP SSL license
          • Visual TFT
          • Visual GLCD
          • Package Manager
          • mikroBootloader
          • CAN calculator
          • GLCD Font Creator
          • Timer Calculator
          • MikroPlot
    • Dev Boards
      • PIC (8-bit)
        • 8th Generation
          • Fusion for PIC v8
          • EasyPIC PRO v8
          • EasyPIC PRO v8 over USB-C
          • EasyPIC v8
          • EasyPIC v8 over USB-C
          • UNI-DS v8
          • UNI-DS v8 over USB-C
        • 7th Generation
          • EasyPIC PRO v7a
          • PICPLC16 v7a
          • EasyPIC v7a
          • EasyPIC PRO v7
          • EasyPIC v7
        • 6th Generation
          • PICPLC16 v6
      • dsPIC/PIC24 (16-bit)
        • 8th Generation
          • EasyPIC v8 PIC24/dsPIC33
          • EasyPIC v8 for dsPIC30
          • EasyPIC v8 for dsPIC30 over USB-C
          • Fusion for PIC v8
          • UNI-DS v8
          • UNI-DS v8 over USB-C
        • 7th Generation
          • EasyPIC Fusion v7
          • EasyPIC v7 for dsPIC30
        • 6th Generation
          • Easy24-33 v6
      • PIC32 (32-bit)
        • 8th Generation
          • Fusion for PIC32
          • Fusion for PIC32 over USB-C
          • Fusion for PIC v8
          • UNI-DS v8
          • UNI-DS v8 over USB-C
        • 7th Generation
          • EasyPIC Fusion v7
      • ARM (32-bit)
        • 8th Generation
          • Fusion for ARM v8
          • Fusion for ARM v8 over USB-C
          • Fusion for STM32 v8
          • Fusion for STM32 over USB-C
          • Fusion for KINETIS v8
          • Fusion for Kinetis v8 over USB-C
          • Fusion for TIVA v8
          • Fusion for TIVA v8 over USB-C
          • UNI-DS v8
          • UNI-DS v8 over USB-C
        • 7th Generation
          • EasyMx PRO v7a STM32
          • EasyMx PRO v7 STM32
          • EasyMx PRO v7 Tiva
      • AVR (8-bit)
        • 8th Generation
          • EasyAVR v8
          • EasyAVR PRO v8
          • EasyAVR PRO v8 over USB-C
          • UNI-DS v8
          • UNI-DS v8 over USB-C
        • 7th Generation
          • EasyAVR v7
        • 6th Generation
          • AVRPLC16 v6
      • 8051 (8-bit)
        • 7th generation
          • BIG8051
        • 6th Generation
          • Easy8051 v6
      • PSoC (8-bit)
        • 6th Generation
          • UNI-DS6 Development System
      • RISC-V (32bit)
        • 8th Generation
          • UNI-DS v8
          • UNI-DS v8 over USB-C
      • Universal Boards
        • 8th Generation
          • UNI-DS v8
          • UNI-DS v8 over USB-C
          • Fusion for PIC v8
          • Fusion for ARM v8
        • 7th Generation
          • EasyPIC Fusion v7
        • 6th Generation
          • UNI-DS6
          • mikroBoard for PIC 80-pin
          • mikroBoard for AVR
          • mikroBoard for dsPIC
          • mikroBoard for PSoC
          • mikroBoard for 8051
          • mikroBoard for PIC 40-pin
          • mikroBoard for ARM
          • mikroBoard for ARM 144-pin
      • IoT - Wearable
        • Hexiwear
          • Hexiwear
          • Hexiwear Power User Pack
          • Hexiwear Docking Station
          • Hexiwear Battery Pack
          • Hexiwear Color Pack
          • Hexiwear Workstation
      • Analog Boards
        • 7th Generation
          • Analog System Lab Kit PRO
    • Starter Boards
      • PIC (8-bit)
        • Clicker
          • PIC clicker
        • Clicker 2
          • Clicker 2 for PIC18FJ
          • Clicker 2 for PIC18FK
        • Clicker 4
          • Clicker 4 for PIC18F
          • UNI Clicker
        • Ready
          • Ready for PIC Board
          • Ready for PIC (DIP28)
          • PIC-Ready2 Board
          • MMC Ready Board
        • StartUSB
          • StartUSB for PIC
      • dsPIC/PIC24 (16-bit)
        • Clicker 2
          • Clicker 2 for PIC24
          • Clicker 2 for dsPIC33
        • Clicker 4
          • UNI Clicker
        • Ready
          • dsPIC-Ready1 Board
          • dsPIC-Ready2 Board
          • DsPIC-Ready3 Board
          • dsPIC-Ready4 Board
      • PIC32 (32-bit)
        • Clicker
          • PIC32MX clicker
          • 6LoWPAN Clicker
          • PIC32MZ clicker
        • Clicker 2
          • Clicker 2 for PIC32MX
          • Clicker 2 for PIC32MZ
        • Clicker 4
          • UNI Clicker
        • MINI
          • MINI-32 Board
          • MINI-32 for PIC32MZ
        • Flip&Click
          • Flip&Click PIC32MZ
      • ARM (32-bit)
        • Clicker
          • RA4M1 Clicker
          • Kinetis Clicker
          • MSP432 Clicker
          • CEC1702 clicker
          • CEC1302 Clicker
          • STM32 M4 clicker
        • Clicker 2
          • Clicker 2 for STM32
          • Clicker 2 for Kinetis
          • Clicker 2 for CEC1702
          • Clicker 2 for MSP432
          • Clicker 2 for CEC1302
          • Clicker 2 for PSoC 6
        • Clicker 4
          • Clicker 4 for STM32F745VG
          • Clicker 4 for STM32F4
          • Clicker 4 for TMPM3H
          • Clicker 4 for TMPM4K
          • Clicker 4 for STM32
          • UNI Clicker
        • MINI
          • MINI-M4 for STM32
          • MINI-M4 For Kinetis
          • MINI-M4 for Tiva
          • MINI-M4 for Stellaris
          • MINI-M4 for MSP432
          • MINI-M0 for STM32
        • Flip&Click
          • Flip&Click SAM3X
      • AVR (8-bit)
        • Clicker 4
          • UNI Clicker
        • MINI
          • MINI-AT Board - 3.3V
          • MINI-AT Board - 5V
        • Ready
          • Ready for AVR Board
          • Ready For XMEGA
          • mikroXMEGA Board
          • AVR-Ready2 Board
        • StartUSB
          • StartUSB for AVR
      • 8051 (8-bit)
        • Ready
          • 8051-Ready Board
      • FT90x (32-bit)
        • Clicker 2
          • Clicker 2 for FT90x
      • Miscellaneous
        • USB
          • USB Wizard
          • Quail
          • FlowPaw Kit
      • Universal Boards
        • Clicker 4
          • UNI Clicker
    • Prog-Debug
      • PIC (8-bit)
        • CODEGRIP
          • UNI CODEGRIP
          • UNI CODEGRIP - USB-C
          • CODEGRIP for PIC
          • CODEGRIP for PIC USB-C
        • mikroProg
          • mikroProg for PIC
      • dsPIC/PIC24 (16-bit)
        • CODEGRIP
          • UNI CODEGRIP
          • UNI CODEGRIP - USB-C
          • CODEGRIP for PIC
        • mikroProg
          • mikroProg for dsPIC
      • PIC32 (32-bit)
        • CODEGRIP
          • UNI CODEGRIP
          • UNI CODEGRIP - USB-C
          • CODEGRIP for PIC
          • CODEGRIP for PIC USB-C
        • mikroProg
          • mikroProg for PIC32
      • ARM (32-bit)
        • CODEGRIP
          • UNI CODEGRIP
          • UNI CODEGRIP USB-C
          • CODEGRIP for ARM
          • CODEGRIP for ARM USB-C
          • CODEGRIP for STM32
          • CODEGRIP for KINETIS
          • CODEGRIP for Tiva
          • CODEGRIP for Tiva USB-C
        • mikroProg
          • mikroProg for STM32
          • mikroProg for Tiva
          • mikroProg for Kinetis
          • mikroProg for CEC
          • mikroProg for MSP432
          • mikroProg for PSoC 5LP
      • AVR (8-bit)
        • CODEGRIP
          • CODEGRIP for AVR
          • CODEGRIP for AVR - USB-C
          • UNI CODEGRIP
          • UNI CODEGRIP - USB-C
        • mikroProg
          • mikroProg for AVR
      • 8051 (8-bit)
        • mikroProg
          • mikroProg for 8051
      • FT90x (32-bit)
        • mikroProg
          • mikroProg for FT90x
    • Smart Displays
      • 2.8"
        • ARM (32-bit)
        • AVR (8-bit)
        • dsPIC/PIC24 (16-bit)
        • PIC (8-bit)
        • PIC32 (32-bit)
      • 3.5"
        • ARM (32-bit)
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        • PIC (8-bit)
        • PIC32 (32-bit)
      • 4.3"
        • ARM (32-bit)
        • FT90x (32-bit)
        • PIC (8-bit)
        • PIC32 (32-bit)
      • 5"
        • ARM (32-bit)
        • FT90x (32-bit)
        • PIC32 (32-bit)
      • 7"
        • ARM (32-bit)
        • FT90x (32-bit)
    • MCU Cards
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        • 8th Generation
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      • PIC32 (32-bit)
        • 8th Generation
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      • ARM (32-bit)
        • 8th Generation
        • 7th Generation
      • AVR (8-bit)
        • 8th Generation
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        • 8th Generation
    • Accessories
      • TFT Displays
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MikroElektronika white logo
  • Products
    • click boards icon Click Boards
      • Wireless Connectivity
        • GPS/GNSS
        • GSM/LTE
        • LTE IoT
        • BT/BLE
        • WiFi
        • RFID/NFC
        • GSM+GPS
        • 6LoWPAN
        • ZigBee
        • UWB
        • SigFox
        • Sub-1 GHz Transceievers
        • 2.4 GHz Trancevers
        • LoRa
        • WiFi+BLE
      • Sensors
        • Biometrics
        • Gas
        • Magnetic
        • Motion
        • Optical
        • Pressure
        • Proximity
        • Temperature & humidity
        • Current sensor
        • Miscellaneous
        • Environmental
        • Force
        • Inductance
        • RF meter
        • Click Shields
        • Click Bundles
      • Interface
        • Adapter
        • CAN
        • Port expander
        • RS485
        • USB
        • 1-Wire
        • RS232
        • Ethernet
        • LIN
        • PWM
        • Current
        • DALI
        • I2C
        • Fiber optics
        • SPI
        • DMX
        • CXPI
        • Click Shields
        • Click Bundles
      • Display & LED
        • LED Drivers
        • LED Matrix
        • LED Segment
        • OLED
        • LCD
        • TFT
        • Click Shields
        • Click Bundles
      • Miscellaneous
        • Relay
        • Optocoupler
        • ID
        • Proto
        • Encryption
        • Click Shields
        • Click Bundles
      • Mixed Signal
        • ADC
        • Measurements
        • DAC
        • Digital potentiometer
        • ADC-DAC
        • Click Shields
        • Click Bundles
      • Storage
        • EEPROM
        • FLASH
        • FRAM
        • microSD
        • MRAM
        • SRAM
        • EERAM
        • ReRAM
        • DRAM
        • Click Shields
        • Click Bundles
      • Motor Control
        • Brushed
        • Brushless
        • Servo
        • Stepper
        • Click Shields
        • Click Bundles
      • Audio & Voice
        • Amplifier
        • Microphone
        • Speakers
        • Signal Processing
        • Speech recognition
        • FM
        • MP3
        • Click Shields
        • Click Bundles
      • HMI
        • Capacitive
        • Pushbutton/Switches
        • Potentiometers
        • Rotary encoder
        • Haptic
        • Fingerprint
        • Click Shields
        • Click Bundles
      • Clock & Timing
        • RTC
        • Clock generator
        • Click Shields
        • Click Bundles
      • Power Management
        • Battery charger
        • Boost
        • Buck
        • Linear
        • Buck-Boost
        • Wireless Charging
        • Power Switch
        • USB-C PD
        • Click Shields
        • Click Bundles
      • Click Bundles
      • Click Shields
    • necto icon NECTO
      • NECTO Studio
    • compilers icon Compilers
      • PIC
        • C
          • NECTO Studio
          • mikroC PRO for PIC
        • Basic
          • mikroBasic PRO for PIC
        • Pascal
          • mikroPascal PRO for PIC
        • Additional Software
          • CODEGRIP WiFi license
          • CODEGRIP SSL license
          • Visual TFT
          • Visual TFT AI
          • Visual GLCD
          • Package Manager
          • mikroBootloader
          • CAN calculator
          • GLCD Font Creator
          • Timer Calculator
          • MikroPlot
      • dsPIC/PIC24
        • C
          • NECTO Studio
          • mikroC PRO for dsPIC
        • Basic
          • mikroBasic PRO for dsPIC
        • Pascal
          • mikroPascal PRO for dsPIC
        • Additional Software
          • CODEGRIP WiFi license
          • CODEGRIP SSL license
          • Visual TFT
          • Visual GLCD
          • Package Manager
          • mikroBootloader
          • CAN calculator
          • GLCD Font Creator
          • Timer Calculator
          • MikroPlot
      • PIC32
        • C
          • NECTO Studio
          • mikroC PRO for PIC32
        • Basic
          • mikroBasic PRO for PIC32
        • Pascal
          • mikroPascal PRO for PIC32
        • Additional Software
          • CODEGRIP WiFi license
          • CODEGRIP SSL license
          • Visual TFT
          • Visual GLCD
          • Package Manager
          • mikroBootloader
          • CAN calculator
          • GLCD Font Creator
          • Timer Calculator
          • MikroPlot
      • ARM
        • C
          • NECTO Studio
          • mikroC PRO for ARM
        • Basic
          • mikroBasic PRO for ARM
        • Pascal
          • mikroPascal PRO for ARM
        • Additional Software
          • CODEGRIP WiFi license
          • CODEGRIP SSL license
          • Visual TFT
          • Visual TFT AI
          • Visual GLCD
          • Package Manager
          • mikroBootloader
          • CAN calculator
          • GLCD Font Creator
          • Timer Calculator
          • MikroPlot
      • AVR
        • C
          • NECTO Studio
          • mikroC PRO for AVR
        • Basic
          • mikroBasic PRO for AVR
        • Pascal
          • mikroPascal PRO for AVR
        • Additional Software
          • CODEGRIP WiFi license
          • CODEGRIP SSL license
          • Visual TFT
          • Visual GLCD
          • Package Manager
          • mikroBootloader
          • CAN calculator
          • GLCD Font Creator
          • Timer Calculator
          • MikroPlot
      • FT90x
        • C
          • mikroC PRO for FT90x
        • Basic
          • mikroBasic PRO for FT90x
        • Pascal
          • mikroPascal PRO for FT90x
        • Additional Software
          • CODEGRIP WiFi license
          • CODEGRIP SSL license
          • Visual TFT
          • Visual GLCD
          • Package Manager
          • mikroBootloader
          • CAN calculator
          • GLCD Font Creator
          • Timer Calculator
          • MikroPlot
      • 8051
        • C
          • mikroC PRO for 8051
        • Basic
          • mikroBasic PRO for 8051
        • Pascal
          • mikroPascal PRO for 8051
        • Additional Software
          • CODEGRIP WiFi license
          • CODEGRIP SSL license
          • Visual TFT
          • Visual GLCD
          • Package Manager
          • mikroBootloader
          • CAN calculator
          • GLCD Font Creator
          • Timer Calculator
          • MikroPlot
    • dev boards icon Dev Boards
      • PIC (8-bit)
        • 8th Generation
          • Fusion for PIC v8
          • EasyPIC PRO v8
          • EasyPIC PRO v8 over USB-C
          • EasyPIC v8
          • EasyPIC v8 over USB-C
          • UNI-DS v8
          • UNI-DS v8 over USB-C
        • 7th Generation
          • EasyPIC PRO v7a
          • PICPLC16 v7a
          • EasyPIC v7a
          • EasyPIC PRO v7
          • EasyPIC v7
        • 6th Generation
          • PICPLC16 v6
      • dsPIC/PIC24 (16-bit)
        • 8th Generation
          • EasyPIC v8 PIC24/dsPIC33
          • EasyPIC v8 for dsPIC30
          • EasyPIC v8 for dsPIC30 over USB-C
          • Fusion for PIC v8
          • UNI-DS v8
          • UNI-DS v8 over USB-C
        • 7th Generation
          • EasyPIC Fusion v7
          • EasyPIC v7 for dsPIC30
        • 6th Generation
          • Easy24-33 v6
      • PIC32 (32-bit)
        • 8th Generation
          • Fusion for PIC32
          • Fusion for PIC32 over USB-C
          • Fusion for PIC v8
          • UNI-DS v8
          • UNI-DS v8 over USB-C
        • 7th Generation
          • EasyPIC Fusion v7
      • ARM (32-bit)
        • 8th Generation
          • Fusion for ARM v8
          • Fusion for ARM v8 over USB-C
          • Fusion for STM32 v8
          • Fusion for STM32 over USB-C
          • Fusion for KINETIS v8
          • Fusion for Kinetis v8 over USB-C
          • Fusion for TIVA v8
          • Fusion for TIVA v8 over USB-C
          • UNI-DS v8
          • UNI-DS v8 over USB-C
        • 7th Generation
          • EasyMx PRO v7a STM32
          • EasyMx PRO v7 STM32
          • EasyMx PRO v7 Tiva
      • AVR (8-bit)
        • 8th Generation
          • EasyAVR v8
          • EasyAVR PRO v8
          • EasyAVR PRO v8 over USB-C
          • UNI-DS v8
          • UNI-DS v8 over USB-C
        • 7th Generation
          • EasyAVR v7
        • 6th Generation
          • AVRPLC16 v6
      • 8051 (8-bit)
        • 7th generation
          • BIG8051
        • 6th Generation
          • Easy8051 v6
      • PSoC (8-bit)
        • 6th Generation
          • UNI-DS6 Development System
      • RISC-V (32bit)
        • 8th Generation
          • UNI-DS v8
          • UNI-DS v8 over USB-C
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  1. Home
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  3. Virtual COM Ports

Virtual COM Ports

Published: 05/05/2016 | Post categories: Communication Interfaces, Learn

| Views:10816

Virtual COM Ports

Virtual COM ports are great for those projects when you need to establish communication with an embedded project, and have no UART peripheral on your board, besides the USB you programmed with. The USB Communications Device Class ( CDC ) can be used to make a USB device look like a RS-232 connection, enabling the user to communicate through USB, transmitting and receiving data through the serial port, to a terminal.

MikroElektronika has an easy-to-use library for USB devices that allows the user to make the USB device look as a Communications Device, Human Interface Device( HID ), or Mass Storage Device( MSD ). Today we will be talking about the CDC class when developing with a Virtual COM port.

USB Devices

USB can be used for many different types of devices such as audio, video, debugging, imaging or printers. The point of creating the Universal Serial Bus was to make a communication bus for all peripherals. USB is fast, reliable, supported by all operating systems, and requires no configuration or setup by the user. The idea for USB was plug n' play, that way USB could be used for any kind of peripheral on any computer and the user would not need to do any searching for drivers. Some things needed for developing a project with a USB device are a host that can support USB, a device driver on the host side along with your code on the projects' side, and you have to know what type of device class you are trying to emulate with your USB connection. On the host side, the computer must find a device driver for the type of device you are attempting to look like, as well as manage data flow, and sometimes provide power. On the device side, you must detect communications from the computer or other device, and be able to respond using standard protocols.

usb_cable

Virtual COM

The MikroE library uses USB protocols and disguises itself as a COM port to enable communication through the terminal using standard USART communication.  The first step is disguising your USB connection using the USB_Device_CDClass. The next thing you must do is initialize the USB device library and setup an interrupt for when you have data received from the computer. Initializing the CDC class sends a device descriptor, configuration descriptor and a string descriptor. The descriptor file is used to tell the USB device what it is going to act like, and what it is going to look like, so that the computer sees it that way and treats it as such. After the computer receives this information, it recognizes the USB as a communication device and begins communication. Here is an example of the setup while attempting to use your USB as a virtual COM port.

#include 

// Buffer of 64 bytes
char buffer[64];

// USB interrupt service routine
void USB0Interrupt() iv IVT_INT_OTG_FS{

  // Call library interrupt handler routine
  USBDev_IntHandler();
}

void USBDev_CDCParamsChanged(){

}

void USBDev_CDCDataReceived(uint16_t size){
  // Prepare receive buffer
  USBDev_CDCSetReceiveBuffer(buffer);
  // Send back received packet
  USBDev_CDCSendData(buffer, size);
}

void main() {

  // Initialize CDC Class
  USBDev_CDCInit();
  
  // Initialize USB device module
  USBDev_Init();
 
  // Enable USB device interrupt
  NVIC_IntEnable(IVT_INT_OTG_FS);

  // Wait until device is configured (enumeration is successfully finished)
  while(USBDev_GetDeviceState() != _USB_DEV_STATE_CONFIGURED)
    ;
 
  // Set receive buffer where received data is stored
  USBDev_CDCSetReceiveBuffer(buffer);

  // Infinite loop
  while(1){
 
  }

}

This example simply receives any data from the computer and sends exactly what is received back to the terminal to be displayed.  It uses the interrupt from the USB to receive and send data using the USB Device library. All you have to do is set a receiving buffer, and handle what you'd like to do with the received data in the USBDev_CDCDataReceived function.

To receive and transmit data on the computer side, simply use a program like PuTTY to interface with serial ports. The baud rate of the virtual COM port is auto-baud, so the baud does not need to be set and can be set to any normal baud rate, for example 9600.

Communication Device Class

The Communication Device Class (CDC) can be used in many different ways. For all the specifications on the many different ways you can use this class you can visit usb.org. CDC has many different ways of being initialized, but in the case of MikroElektronikas' library for virtual COM ports, we use 3 specific descriptors for initialization. One descriptor that is very important is called the USB_CDC_cfg_descriptor, which contains the configuration descriptor, interface descriptors, and endpoint descriptors for all of the interfaces. Here is an example of this descriptor:

const uint8_t USB_CDC_cfg_descriptor[_USB_CDC_CONFIG_DESC_SIZ] = {

    // Configuration Descriptor
    0x09,   //  bLength: Configuration Descriptor size
    0x02,   //  bDescriptorType: Configuration
    _USB_CDC_CONFIG_DESC_SIZ,       //  wTotalLength: number of returned bytes
    _USB_CDC_CONFIG_DESC_SIZ >> 8,
    0x02,   //  bNumInterfaces: 2 interfaces
    0x01,   //  bConfigurationValue: Configuration value
    0x00,   //  iConfiguration: Index of string descriptor describing the configuration
    0xC0,   //  bmAttributes: self powered
    0x32,   //  bMaxPower: 100 mA

    // Interface Descriptor
    0x09,   //  bLength: Interface Descriptor size
    _USB_DEV_DESCRIPTOR_TYPE_INTERFACE,  //  bDescriptorType: Interface
    0x00,   //  bInterfaceNumber: Number of Interface
    0x00,   //  bAlternateSetting: Alternate setting
    0x01,   //  bNumEndpoints: One endpoint used
    0x02,   //  bInterfaceClass: Communication Interface Class
    0x02,   //  bInterfaceSubClass: Abstract Control Model
    0x01,   //  bInterfaceProtocol: AT commands
    0x00,   //  iInterface: string descriptor index

    // Header Functional Descriptor
    0x05,   //  bLength: Descriptor size
    0x24,   //  bDescriptorType: CS_INTERFACE
    0x00,   //  bDescriptorSubtype: Header Functional Descriptor
    0x10,   //  bcdCDC: specification release number
    0x01,

    // Call Management Functional Descriptor
    0x05,   //  bFunctionLength: Descriptor size
    0x24,   //  bDescriptorType: CS_INTERFACE
    0x01,   //  bDescriptorSubtype: Call Management Functional descriptor
    0x00,   //  bmCapabilities: Device does not handle call management itself
    0x01,   //  bDataInterface: 1

    // Abstract Control Management Functional Descriptor
    0x04,   //  bFunctionLength: Descriptor size
    0x24,   //  bDescriptorType: CS_INTERFACE
    0x02,   //  bDescriptorSubtype: Abstract Control Management descriptor
    0x02,   //  bmCapabilities:  Device supports the request combination of
            //  Set_Line_Coding, Set_Control_Line_State,
            //  Get_Line_Coding, and the notification Serial_State

    // Union Functional Descriptor
    0x05,   //  bFunctionLength: Descriptor size
    0x24,   //  bDescriptorType: CS_INTERFACE
    0x06,   //  bDescriptorSubtype: Union functional descriptor
    0x00,   //  bMasterInterface: Communication class interface
    0x01,   //  bSlaveInterface0: Data Class Interface

    // Interrupt IN Endpoint Descriptor
    0x07,   //  bLength: Endpoint Descriptor size
    _USB_DEV_DESCRIPTOR_TYPE_ENDPOINT,   //  bDescriptorType: Endpoint
    0x80 | _USB_CDC_INT_EP_IN,           //  bEndpointAddress
    0x03,   //  bmAttributes: Interrupt
    0x08,   //  wMaxPacketSize
    0x00,
    0xFF,   //  bInterval

    // Data class interface descriptor
    0x09,   //  bLength: Endpoint Descriptor size
    _USB_DEV_DESCRIPTOR_TYPE_INTERFACE,  //  bDescriptorType:
    0x01,   //  bInterfaceNumber: Number of Interface
    0x00,   //  bAlternateSetting: Alternate setting
    0x02,   //  bNumEndpoints: Two endpoints used
    0x0A,   //  bInterfaceClass: CDC
    0x00,   //  bInterfaceSubClass
    0x00,   //  bInterfaceProtocol
    0x00,   //  iInterface
deo, debugging, imaging or printers. The point of creating the Universal Serial Bus was to make a communication bus for all peripherals. USB is fast, reliable, supported by all operating systems, and requires no configuration or setup by the user. The idea for USB was plug n' play, that way USB could be used for any kind of peripheral on any computer and the user would not need to do any searching for drivers. Some things needed for developing a project with a USB device are a host that can support USB, a device driver on the host side along with your code on the projects' side, and you have to know what type of device class you are trying to emulate with your USB connection. On the host side, the computer must find a device driver for the type of device you are emulating, as well as manage data flow, and sometimes provide power. Your device must detect communications from the computer or other device, and be able to respond using standard protocols.


    // Bulk OUT Endpoint Descriptor
    0x07,   //  bLength: Endpoint Descriptor size
    _USB_DEV_DESCRIPTOR_TYPE_ENDPOINT,   //  bDescriptorType: Endpoint
    _USB_CDC_BULK_EP_OUT,                //  bEndpointAddress
    0x02,   //  bmAttributes: Bulk
    64,     //  wMaxPacketSize
    0x00,
    0x00,   //  bInterval: ignore for Bulk transfer

    // Bulk IN Endpoint Descriptor
    0x07,   //  bLength: Endpoint Descriptor size
    _USB_DEV_DESCRIPTOR_TYPE_ENDPOINT,   //  bDescriptorType: Endpoint
    0x80 | _USB_CDC_BULK_EP_IN,          //  bEndpointAddress
    0x02,   //  bmAttributes: Bulk
    64,     //  wMaxPacketSize
    0x00,
    0x00    //  bInterval
};

How To Use

When using the VCP library it is very easy to establish a disguise for your USB and initialize communication. There are 2  things that you must have:

  1. interrupt handler to call the USBDev_IntHandler()
  2. a function used to set the receiving buffer.

The library is then controlled by the interrupt that is waiting for the USB interrupt to be triggered that represent the data from the computer into the receive buffer for the application. After programming your board the library will start working and the PC connected will recognize the USB as a Communications Device and can begin communication. Simply open up your terminal application, like PuTTY. Find out what serial port your USB device is on by opening up the device manage in windows and looking under Ports (COM & LPT). Your device should come up as USB Serial Port followed by what COM number it is. Place that in the text box in PuTTY and set the baud rate to a normal baud rate like 9600. Click Open at the bottom right of PuTTY and begin typing. It might look like you are just typing into the terminal, but actually that is what is being sent back to the terminal from your device.

Pretty cool huh? And it was pretty painless too.

Summary

Virtual COM ports can be very useful in those rare cases where your project just doesn't have a port for UART communication, and you have to improvise and trick the computer into thinking that you do. There are many different ways to use the USB_Device library to fit your projects needs, and have been made very easy by the MikroE library. Go try this out on our Clicker 2 with the STM32, it works great!

References

USB Class Specifications http://www.usb.org/developers/docs/devclass_docs/ 2016

USB in a NutShell http://www.beyondlogic.org/usbnutshell/usb1.shtml 2010

USB Descriptors http://www.beyondlogic.org/usbnutshell/usb5.shtml#DeviceDescriptors 2010

MikroE USB Device Library https://libstock.mikroe.com/projects/view/568/usb-device-library 1998-2016

PuTTY Download 2016

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