SAMD51 Datasheet MartinL Holy Grail Analog Comparator Example SAMD51 4 pin DMA multiplexing + ZeroDMA format ^99fd12 https://forum.arduino.cc/t/samd51-adc0-and-adc1-multiplexing-with-dma/1238002/5 Possible Issues With Datalogging + SD/SPI Adafruit SdFat might not be the move :( More SPI speedup stuff for the M0 SdFat - Adafruit Fork - Arduino Reference ^9eb02b GitHub - greiman/SdFat: Arduino FAT16/FAT32 exFAT Library