Fix IMU not work in some compiled environments

Compatible with ESP32 up to 2.0.0

Update COM_LTE.ino

Prevent double declaration

Prevent double declaration

0.3.9

0.3.9

Merge pull request m5stack#267 from Tinyu-Zhao/master

fix some error

Merge pull request m5stack#260 from Tinyu-Zhao/master

Add some examples

Merge pull request m5stack#258 from Tinyu-Zhao/master

Add some annotation

Merge pull request m5stack#256 from Tinyu-Zhao/master

add some Example&explain

Merge branch 'master' of github.com:m5stack/M5Stack