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ADC & DMA disrupting SPI

Question asked by ressel.tim on Jun 13, 2018
Latest reply on Jun 14, 2018 by waclawek.jan


I have ADC & DMA working well, scanning 2 channels in circular mode using full and half full callback routines. It works swimmingly. I also have SPI transmissions happening off of a timer interrupt. The problem is the SPI transmissions are being disrupted by the ADC operation. I need the DAC timing to be solid, but is it jittery. If I disable the ADC by kiling the call to start the ADC-DMA cycle the SPI looks perfect, so I know its the ADC that is causing it. Is there a way to set priorities so the SPI dominates over the ADC system?