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NanoC6 / NanoH2: switch the RGB LED power on when the LEDs are first used - #389
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…used The RGB LED on these boards is powered through a switch controlled by a GPIO (NanoC6: GPIO19, NanoH2: GPIO10). The LED driver only configured the data pin, so M5.Led never lit anything. The switch pin is a new field of the RMT bus config (pin_power) and is driven high in the bus init, which runs on the first LED access, so a sketch that does not use the LEDs keeps them unpowered. A frame sent right after switching the supply on is lost (0 ms fails, 1 ms works on both boards), so the init waits 5 ms once. release() turns the supply off again.
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On NanoC6 and NanoH2 the RGB LED is powered through a switch controlled by a GPIO (NanoC6: GPIO19, NanoH2: GPIO10, documented in the PinMap of each board).
M5.Ledonly configured the WS2812 data pin, so the LED never lit on these boards.The switch pin is a new field of the RMT bus config (
pin_power). It is driven high in the bus init, which runs on the first LED access, so a sketch that does not use the LEDs keeps them unpowered (the WS2812 draws a quiescent current even when dark).release()turns the supply off again.A frame sent right after switching the supply on is lost — measured on both boards: 0 ms between the switch and the first frame fails, 1 ms works — so the init waits 5 ms once.
Verification:
M5.Ledas expected, starting from the first frame.