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The driver enables the DMA interrupt regardless if the callback is enabled or not. DMA errors could be caused by DMA accessing unmapped memory or by starting an operation while the driver is still sending old data. Giovanni. 1. Introduction To SPI Communication. SPI is an acronym for (Serial Peripheral Interface) pronounced as "S-P-I" or "Spy". Which is an interface bus typically used for serial communication between microcomputer systems and other devices, memories, and sensors. Usually used to interface Flash Memories, ADC, DAC, RTC, LCD, SDcards, and.