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by halbritt 2668 days ago
Quadcopter pilots have been using STM32F3 for years. Check out: https://github.com/betaflight/betaflight one of the more popular flight control projects. They've been supporting STM32F4 and STM32F7 for quite some time.

A typical quad flight controller with an STM32F4 and a decent MPU will set you back less than $30.