Hi Andrew, That's good to know that the bit banging method used the same pins on the same CPU. That makes my comments about the hardware connections between CPU B and DAC B less relevant. You mentioned originally that lowering the SPI frequency did not help: [quote userid="638758" url="~/support/data-converters-group/data-converters/f/data-converters-forum/1483806/dac8562-dac-not-responding-even-with-supposedly-correct-spi-signals"]We've tried different SPI speeds. No luck.[/quote] Did you try as low of a frequency as the bit banging method? Best, Katlynne Jones
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