86 backlight doesnt turn off on the m5stickc plus2 #88
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Also: - update M5ez library dependency - disable IMU, mic and speaker - cleanup display rotation
The M5StickC Plus and Core devices use PWM to control backlight, unlike the M5StickC and M5StickCPlus. During lightSleep() PWM is inactive, so backlight control goes crazy, instead, reduce CPU frequency and just delay, avoid lightSleep. Enable compiler warnings, fix warnings.
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