diff options
| -rw-r--r-- | firmware/common/file.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/firmware/common/file.c b/firmware/common/file.c index a5d9443aeb..9d18c613bf 100644 --- a/firmware/common/file.c +++ b/firmware/common/file.c @@ -24,6 +24,15 @@ #include "dir.h" #include "debug.h" +/* + These functions provide a roughly POSIX-compatible file IO API. + + Since the fat32 driver only manages sectors, we maintain a one-sector + cache for each open file. This way we can provide byte access without + having to re-read the sector each time. + The penalty is the RAM used for the cache and slightly more complex code. +*/ + #define MAX_OPEN_FILES 4 struct filedesc { |