Jeff Epler f22299d2b3 sdcardio: Use CMD25 across multiple writeblocks() calls ... This increases write rates (of gifio from #5490) from about 2.4fps to over 5fps by making more efficient use of the SD card protocol. Because of details of oofatfs, it usually manages 64 writes in a single CMD25, then two writes in a different area of the SD card (presumably, filesystem metadata). I couldn't find where to increase "64" to a higher number. This may depend on the allocation size of the filesystem. I tried preallocating too, but oddly it significantly lowered the write rate. Any trailing data is committed when the file is close()d, or when the `sync` method of the SDCard object is called.		2021-10-25 10:59:28 -05:00
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__init__.c	sdcardio: implement new library for SD card I/O	2020-06-26 11:50:23 -05:00
__init__.h	sdcardio: implement new library for SD card I/O	2020-06-26 11:50:23 -05:00
SDCard.c	sdcardio: Use CMD25 across multiple writeblocks() calls	2021-10-25 10:59:28 -05:00
SDCard.h	sdcardio: Use CMD25 across multiple writeblocks() calls	2021-10-25 10:59:28 -05:00