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- ADDDING A VIRTUAL PORT WINDOWS 10 HOW TO
- ADDDING A VIRTUAL PORT WINDOWS 10 SERIAL
- ADDDING A VIRTUAL PORT WINDOWS 10 DRIVERS
For Windows, an INF file matches the driver to the device. Instead of a vendor-specific driver, the PC uses the USB communication devices class (CDC) driver included with Windows and other OSes.
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Device firmware manages USB communications and whatever other tasks the device is responsible for. The device can use a general-purpose microcontroller with an embedded USB controller or a CPU that interfaces to an external USB controller.
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The design doesn’t require a specific vendor’s USB controller or driver. The device I’ll describe takes a different approach. Other companies with UART bridge chips include MosChip Semiconductor Technology Ltd., Prolific Technology, and Silicon Laboratories.
ADDDING A VIRTUAL PORT WINDOWS 10 SERIAL
Many existing devices with asynchronous serial ports can use a USB UART to convert to USB with no firmware changes. These chips are a quick way to add a USB port to a design. A similar chip is FTDI’s FT245R USB FIFO, which has a parallel interface instead of the serial port.
ADDDING A VIRTUAL PORT WINDOWS 10 DRIVERS
FTDI provides drivers for Windows and other OSes. The chip handles all USB-specific communications in hardware and has an asynchronous serial port that can interface to a port on a microcontroller. One way to create a virtual COM-port device is to use a dedicated chip such as FTDI’s FT232R USB UART. Or a device might just read and store sensor data from an on-chip analog port and send the data to a PC via USB. Some virtual COM-port devices convert between USB and a parallel interface. Many USB virtual COM-port devices function as bridges that convert between USB and RS-232 or other asynchronous serial interfaces.īut a virtual COM port doesn’t have to have a serial interface at all. The application reads and writes to the port as needed and when finished communicating, closes the port to allow other applications access to it.Ī USB virtual COM port is a software interface that enables applications to access a USB device as if it were a built-in serial port. For many devices, an application can also get and set port parameters such as bit rate, number of data bits per word, and flow-control method. To communicate with a COM port, an application first reserves the resource by opening the port. Other COM-port devices support vendor-specific command sets for data acquisition, motor control, or other uses. A classic example is a modem that enables a PC to send and receive data over phone lines and responds to AT (Hayes modem) commands from the PC. The COM-port software interface provides a way for PCs to exchange data with devices for any purpose. The device uses standard USB class drivers included with Windows and other OSes.
ADDDING A VIRTUAL PORT WINDOWS 10 HOW TO
This article will show how to design and program a USB virtual COM-port device using a general-purpose microcontroller with an embedded or external USB controller. NET's SerialPort class or other COM-port APIs or libraries. But with the right firmware, a USB device can appear as a virtual COM port that applications can access using. Recent PCs often skip RS-232 in favor of USB. The traditional COM port on a PC is an RS-232 serial port on a motherboard or expansion card. This article originally appeared in Circuit Celler.ĬOM ports have long provided a convenient way for PCs and embedded systems to exchange information. Create a USB Virtual COM Port Create a USB Virtual COM Port