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SD card extension for OpenFAT library

OpenFAT is an open-source FAT file system implementation for embedded systems. The original library is well written and documented. We recently came across this library while looking for a LibOpenCM3 support SD/MMC FAT file system library. At the initial review, we notice that this library does not maintain for the last ten years. Also, it does not provide support to the latest SD card types. After review the latest SD card specifications , we add SD card support to this library and release it with the same license. The updated library is available at the github.com/dilshan/sdfatlib . The testing of this library is carry on a popular STM32F103C8T6 blue pill development board. The suggested wiring layout is given, below. Wiring layout for the test setup. For the above test layout, we use a standard SD card adapter module (which comes without a built-in level-shifter and voltage regulator). Due to the 3.3V support of the STM32F103C8T6 , the wiring layout is straightforward. The CH34...