Hi specialists,
I'm trying to understand how the axp209 on Banana Pi works with the A20.
In the Banana Pi schematics I see, that they are connected with only four lines. Two lines are used for I²C (TWSI), one is from axp209 PWROK to RESET# of A20 and another one is connected from axp209 IRQ and GPIO2 to NMI# of A20.
When system is off and I press my Power Button (K1) on the Pi, the system is booting. System is running and I long press the Power Button, System shuts down. But can anyone say whats happening? What does axp209 do with IRQ, GPIO2 and PWROK pins? Wich way does the A20 recognize, that it has to shutdown?
Yours Martin