这个工程主要是简单的显示SD卡的文件目录。
, |& r% w& {& j$ vThis project implements a simple file explorer that displays the directory structure on the SD card.The included CircleOs binary include a SDIO driver and a Fat12/16/32 implementation based on DosFS. This a demo project to show usage of the SD card.
This project is aimed to be a demo project about how to use the CircleOS filesystem. It can display PRM (converted BMP, JPG, etc) images with a sample viewer.
Included in this project an application to convert BMP, JPG, etc files to PRM with the functionality to scale the image to a desired resolution.
5 U  B+ A- {0 W, M: `# K Current layout of PRM image file:
 8byte header:
- byte 0: height
- byte 1: width
- 6 bytes for future use
- pixel data (2 bytes per pixel)
 FS interface functions:
u32 FS_Mount(enum STORAGE_device device);
, L( h" @  q8 \u32 FS_Unmount(enum STORAGE_device device);
u32 FS_OpenFile(PVOLINFO volinfo, u8 *path, u8 mode, PFILEINFO fileinfo);
: o, `) f' X( E1 o- H7 L$ [u32 FS_ReadFile(PFILEINFO fileinfo,  u8 *buffer, u32 *successcount, u32 len);
u32 FS_WriteFile(PFILEINFO fileinfo,  u8 *buffer, u32 *successcount, u32 len);
u32 FS_Close(PFILEINFO fileinfo);
1 _' b$ {0 W( Z2 f  h: s$ U- avoid FS_Seek(PFILEINFO fileinfo, u32 offset);
u32 FS_Delete(PVOLINFO volinfo, u8 *path);
u32 FS_GetNextEntry(PVOLINFO volinfo, PDIRINFO dirinfo, PDIRENT dirent);
& y' X/ V+ `" m) A9 o& q2 ^; Fu32 FS_OpenDirectory(PVOLINFO volinfo,u8 *dirname, PDIRINFO dirinfo);
8 U" R( S7 v1 Cu32 FS_GetVolumeInfo(u8 unit,  u32 startsector, PVOLINFO volinfo);
' K: }" d( ^6 _ 
 
6 ~# u* k! b& E# m+ sThis is a snapshot of my current work in progress with partially integrated jpg decompressor
; @  S/ G; n1 {. e: F0 M