[quote userid="47378" url="~/support/microcontrollers/msp-low-power-microcontrollers-group/msp430/f/msp-low-power-microcontroller-forum/1074411/msp432p401r-problem-with-spi/3976176#3976176"]What is the purpose of wiggling SCK and MOSI at startup?[/quote] What do you mean by that? What line exactly? [quote userid="47378" url="~/support/microcontrollers/msp-low-power-microcontrollers-group/msp430/f/msp-low-power-microcontroller-forum/1074411/msp432p401r-problem-with-spi/3976176#3976176"]More generally: What is your symptom exactly? You mentioned that the waveforms look correct.[/quote] The symptom is that the DDS can not be programmed with UCB1, but it can with UCB0
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