Dear sir,
I am a professional embedded audio developer with more than 3 years experience on spectral processing audio dsp algorithms. I have ported to numerous target platforms complex frequency domain signal processing algorithms, both real time and non real time. I also have experience working with stm32 arm microcontrollers as i currently work on a space mission embedded device where all the cpus used are stm32f4 and stm32l1 for the critical low power subsystems. I prefer using eclipse with gcc and i prefer using cube hal as the system drivers library. I also have already availiable the development board you are also using.
A simple spectrum scope is a task that i can easily design develop and explain in a short amount of time especially if no realtime requirements are needed which seems to be the case for your project.
I will be availiable from september 1st as i have a few other projects to complete till that time, but your project is of great interest to me and i ll be more than happy to assist you in accomplishing your goal in time.
Best regards
Aris