After fault finding and fixing the Dev Interface PWA, the testing of the RX-Modulus doesn't involve that might in terms of equipment. You just require a PC and a STLINK V3 Mini. The image below shows everything you need and even showing the short term fix from the earlier post.

The first and probably most criteria task was to try the USB interface. To help with the configuration of the STM32 core used we started with STM32CubeMX. Now I cannot tell you how amazingly useful this software package is.

The most useful features are:

• Allows to easy pin defines and setup
• Shows any pin conflicts that are normally hidden in datasheet pin tables.
• Highlights features that cannot be used if certain pins are used.
• Easy code generation to open in Cube IDE or Keil MDK.

The incorporation of STM32CubeMX is really recommended at the beginning stages of the circuit schematic stages. This give you a good starting point to achieve a right first time prototype. In the next post I'll be talking about the USB HID stack and how I achieved a working USB HID Collection.