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SPI speedup Indeed

December 15, 2013

I am still planning to stick with a 400khz clock but I ran the avr code up to the fastest I could get – about 2mhz and it still worked fine.  The waveform on the oscilloscope looks good even with breadboards and long cables.  The SD card 400khz limit must be old news.

I may try setting it to 1mhz and leaving it there. That would still require a one instruction gap between SPI accesses but that should be no issue.

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