Is the LED on the board controllable via GPIO?
If yes, any document?
Is the LED on board controllable?
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Good question!
As far as I can see, there are even two LEDs.
The green LED is the power indicator and is constantly on and the other one is red. I used my multimeter to find out which side of the LED is connected to ground, then I tested the other side against all lines of the GPIO connector.
Pin 8 GPIO4_C4 DEBUG_TXD
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The green LED is the power indicator and is constantly on. It is not controllable via GPIO. While the red LED is controllable.
The two LED series circuits are connected as follows.
+5V — Resistance(1K) — Green LED — GND
RK3399(GPIO3_D5 pin) — Resistance(1K) — Red LED — GND
To operate the GPIO, see https://wiki.radxa.com/Rockpi4/hardware/gpio
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