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For PI 2 and PI 3 you need to change the base address to this: #define BCM2708_PERI_BASE 0x3f000000For the PI 1 this was 0x20000000
Nowhere does it say which pin is the clock pin. From the code it looks like it is GPIO4 but I can't be sure. Can anyone confirm this? I can't be sure because all I am getting for data is mostly zeros and then some small noise at the end.
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