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Quadrotor from scratch
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quadrotor/abs.h

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Improve handling of arming, providing LED blink codes if the arming fails. Also, implement a software watchdog to make sure that the main real-time modules are actually being run. Provide a panic facility, also giving blink codes to indicate the panic reason.
12 years ago
/* abs.h */
#define abs(x) (((x) < 0)? (-(x)) : (x))