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I've been looking over the SD library that was installed as part of the chipKIT boards (ver 1.4.1) and I get the distinct impression that it implements the SPI protocol to the SD card using bit-banging, rather than a PIC32 SPI peripheral. Is this correct? Assuming so, are there any Arduino-compatible libraries for the Wi-FIRE that utilized the SPI peripherals? Assuming not, is my best be to go with MPLAB Harmony? (I'm an old MPLAB-X guy using version 2.10 and an old peripheral library)