Johny Mattsson 4a47813e20 Reduced SPIFFS cache, freeing ~0.5k RAM.
Also made the cache on/off configurable via user_config.h. Uncached writes
are not a very good idea, but for read-only deployments a further ~0.5k RAM
can be gained by disabling the cache.

Tweaked the file.read() workhorse to read large chunks at a time rather
than use getc(), to compensate for potential unavailability of cache.
2015-07-31 18:15:18 +10:00
..