I'm working on a project that will eventually be a custom-fab PCB with an SD socket wired to the hardware SPI pins on the AVR (an ATmega328p). I've been doing some of the development work on the software on a Sparkfun Pro Micro, based on the m32u4. I got the project to work. I use the SD library in…

SD Library Inconsistency between Arduinos [SOLVED]

Coding_Badly April 8, 2014, 7:13am 2

...and we hear back nothing.

"Hear back nothing"? Are you expecting the processor to holler?