Many products feature USB to facilitate communication between various devices, to transfer files easily, support hardware peripherals or add other features. While working on embedded systems, we have developed a variety of devices that utilize USB in these ways.<\/p>\n\n\n\n
The ease of implementation of USB largely depends on the hardware and software infrastructure that the microcontroller manufacturer provides. As of release 5.12.0, ARM Mbed OS began supporting USB device for several targets. This provides a nice layer of abstraction between the various manufacturers\u2019 USB implementations and the USB class code. There are a variety of USB classes that are supported by default: USB MSD, USB HID, and USB Audio.<\/p>\n\n\n\n
In this blog, I\u2019m going to try out this new USB device support and create a USB Mouse out of an old joystick.<\/p>\n\n\n\n
I want to test out the USB HID class which will allow the device to interface with the PC as a USB mouse. I am going to start by creating a basic ARM Mbed OS<\/strong> project. If you have never done that before, take a look at this guide.<\/a><\/p>\n\n\n\n For this project, I am using a NUCLEO_F429ZI<\/strong> development board which is one of the supported targets for using mbed\u2019s USB device. I set the target in my project by using the command \u201cmbed target NUCLEO_F429ZI\u201d.<\/strong> Make sure that your compiler is also set correctly according to the compiler that you have installed.<\/p>\n\n\n\n For the test, I am going to copy-and-paste the example main from the file mbed\/usb\/device\/USBHID\/USBMouse.h.<\/p>\n\n\n\n