USB SER Driver for Windows
How to Install a USB SER Driver?
Whenever you want to connect your USB to a serial device, you need to ensure that you are using the right USB SER driver. To do this, you need to check whether you have installed the driver correctly and register the device with the USB-to-serial core.
Installing the driver:
Having a USB-to-serial adapter is a must if you plan on performing some level of communication with your device. If you are not sure how to go about it, the following tips should help.
The first step is to connect the USB-to-serial adapter to your PC via a USB port. If you are using a Windows PC, the “Power” LED should be on. Once you have connected your USB-to-serial adapter, it is time to install the requisite drivers. Fortunately, this task is not as daunting as it sounds. The following steps will get you up and running in no time.
Using a USB-to-serial cable may be the simplest solution. A USB-to-serial cable is a standardized, serial-bus-based interface between a computer and USB-enabled peripheral devices. As such, drivers are bundled with the product and can be installed with the click of a button.
Registering with the USB-to-serial core:
Using the USB core’s register function allows the driver to send early-initialize commands to the device, or download firmware. The function uses the struct usb_interface structure and a pointer to the USB device. The driver should call usb_register_dev before submitting the probe function to the USB core.
During the registration process, the USB core assigns a minor number to the device. This is valid only if the driver successfully registers the device with the core. If it is not claimed by the driver, the core will return a null value, which will cause the driver to abort the call.
The USB core uses the struct usb_device_id structure to match the device with the correct class. The usb_serial_device_type structure contains an alt setting array that defines the current interface setting. If a device is in high-bandwidth mode, the USB specification has details about the high-bandwidth mode.
Using function pointers to call functions in C is a good way to minimize code duplication and speed up your code. Although function pointers have received a bad rap for being confusing and oversimplified, they’re actually a powerful tool and can be used to great effect.
For example, let’s say you’re writing a simple C program that can sort any data type. One way to do this is by using the qsort function.
The qsort function can sort any array of structures in any order. However, this can be done in more elegant ways using function pointers.
So, the function pointer is the simplest way to call a function. A function pointer is a pointer to a function that has been defined in the function pointer structure.
Abort the call and notify the USB core that this device is not claimed by any drivers:
Typically, user-mode USB drivers are not allowed to perform I/O operations on devices that are not read-safe. However, there is a method that allows a user-mode driver to claim an interface for use by another driver. This method is not supported by all backends.
To claim an interface, an application can use the libusb_claim_interface function. This function is a non-blocking function that instructs the underlying operating system that the application wishes to claim an interface for use. The function will return a pointer to the device for which the interface has been claimed.
To claim an interface, the application must call libusb_claim_interface with the interface’s name. This function will also send a SET_INTERFACE control request. This control request will cause the majority of the device’s configuration to be reset.
Checking if USB SER drivers are installed correctly:
Using the Device Manager to check if your USB SER drivers are installed correctly is a good idea. The Windows operating system allows you to manually install drivers in a number of ways.
So, the best way to update your USB SER drivers is to go to the source. A number of peripheral companies offer updated drivers for download on their support pages. You can also take a look at your system’s bundled software to see if the driver is there. If not, you can uninstall it and then follow the manufacturer’s instructions to install it from scratch.
Alternatively, you can try to install the drivers using the built-in Windows installation program. So, this is a relatively straightforward process. If you opt to do it manually, you’ll have to be patient as it will take some time for Windows to install the drivers for you.