AP_RangeFinder_MaxsonarI2CXL: Take device semaphore before interacting with i2c device #31384
+75
−57
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This also introduces a base class for I2C rangefinders, which is what this branch was about.
Saved 16 bytes before adding the required take-semaphore.
I've tested that at least one other backend fits into the new framework well.
The last patch matches the PR title.