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This is what I want mine to do. I am Working on one for a Xmas gift and I am 99% complete. Everything works including the power button on the NES. I am stuck on the shutdown I have everything soldered to the mausberry switch and I am using gpio 23 and gpio 24. on boot up i can see error erc/ line9, line 11 echo write error device not responding or busy.
In your code it appears you are using 23 24 and 25. could you send me a pic or diagram on how you have it wired.