Quadcopter Uses Bare Metal STM32

[Tim Schumacher] got a Crazepony Mini quadcopter and has been reprogramming it “bare metal” — that is to say he’s programming the STM32 without using an operating system or do-it-all environment. His post on the subject is a good reference for working with the STM32 and the quadcopter, too.
If you haven’t seen the quadcopter, it is basically a PC board with props. The firmware is open source but uses the Keil IDE. The CPU is an STM32 with 64K of program memory. In addition, the drone sports a wireless module, a digital compass, an altimeter, and a gyro with an

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