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Andrew Tridgell
ff37fde6f1
The constructor called set_rotation() before register_compass() had assigned the backend instance, so it wrote the rotation of compass instance 0. Every AF9838 probe on an external bus constructs a backend, so on boards without an AF9838 each failed probe cleared the rotation of whichever compass was already registered as instance 0. An external IST8310 lost its PITCH_180 rotation this way.