Getting STM32 CAD files, footprints and schematic objects, into EagleCAD.
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Navigate to https://www.st.com/
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Search the Resources section for the chip series, followed by "OrCad", like "STM32F3 orcad".
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Download the OrCad Symbol and Footprint files and unzip the file. 
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Navigate to https://www.ultralibrarian.com/products/online-reader and go to 'Convert BXLs Now'.
- Upload the desired chip model BXL file.
- Go straight to Download Now.
- In the CAD Format selection, find Eagle and check the box for v6+, and download.
- You now have an EagleCAD .scr script file.
- Open Eagle and go to File > New > Library.
- At this window now go to File > Execute Script...
- Once the script is opened you should see appear the schematic, footprint and device in the library. The library can now be saved.
