Which SPI clock phase type are you?
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afiak it started with slave devices using any of the four modes before it was even called SPI. Just the four sane ways of 1/
hooking up a shift register to a serial interface. None better than the others. Then Motorola made a host controller that 2/
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could talk to all those existing devices and called the whole thing SPI. Other than I2C there is no "SPI standard". 3/
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The whole CPOL and CPHA nomenclature just comes from the way that fairly universal controller used to be configured. 4/4
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