spi.py:fix spi model_0 for read. data shift at negedge, sample at posedge. #244
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We noticed with CPOL=0 and CPHA=0 this did not work. With CPHA=0 we should be sampling on the positive edge, not the negative. Perhaps CPHA needs to be factored in here, too. In the meantime reversing the polarity of this check works.
