291 lines
8.4 KiB
C
291 lines
8.4 KiB
C
/**
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* @file lv_fs_fatfs.c
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*
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*/
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/*********************
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* INCLUDES
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*********************/
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#include "../../../../lvgl/lvgl.h"
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#if LV_USE_FS_FATFS
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#include "ff.h"
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/*********************
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* DEFINES
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*********************/
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#if LV_FS_FATFS_LETTER == '\0'
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#error "LV_FS_FATFS_LETTER must be an upper case ASCII letter"
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#endif
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/**********************
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* TYPEDEFS
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**********************/
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/**********************
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* STATIC PROTOTYPES
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**********************/
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static void fs_init(void);
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static void * fs_open(lv_fs_drv_t * drv, const char * path, lv_fs_mode_t mode);
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static lv_fs_res_t fs_close(lv_fs_drv_t * drv, void * file_p);
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static lv_fs_res_t fs_read(lv_fs_drv_t * drv, void * file_p, void * buf, uint32_t btr, uint32_t * br);
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static lv_fs_res_t fs_write(lv_fs_drv_t * drv, void * file_p, const void * buf, uint32_t btw, uint32_t * bw);
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static lv_fs_res_t fs_seek(lv_fs_drv_t * drv, void * file_p, uint32_t pos, lv_fs_whence_t whence);
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static lv_fs_res_t fs_tell(lv_fs_drv_t * drv, void * file_p, uint32_t * pos_p);
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static void * fs_dir_open(lv_fs_drv_t * drv, const char * path);
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static lv_fs_res_t fs_dir_read(lv_fs_drv_t * drv, void * dir_p, char * fn);
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static lv_fs_res_t fs_dir_close(lv_fs_drv_t * drv, void * dir_p);
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/**********************
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* STATIC VARIABLES
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**********************/
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/**********************
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* MACROS
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**********************/
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/**********************
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* GLOBAL FUNCTIONS
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**********************/
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void lv_fs_fatfs_init(void)
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{
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/*----------------------------------------------------
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* Initialize your storage device and File System
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* -------------------------------------------------*/
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fs_init();
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/*---------------------------------------------------
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* Register the file system interface in LVGL
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*--------------------------------------------------*/
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/*Add a simple drive to open images*/
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static lv_fs_drv_t fs_drv; /*A driver descriptor*/
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lv_fs_drv_init(&fs_drv);
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/*Set up fields...*/
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fs_drv.letter = LV_FS_FATFS_LETTER;
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fs_drv.cache_size = LV_FS_FATFS_CACHE_SIZE;
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fs_drv.open_cb = fs_open;
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fs_drv.close_cb = fs_close;
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fs_drv.read_cb = fs_read;
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fs_drv.write_cb = fs_write;
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fs_drv.seek_cb = fs_seek;
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fs_drv.tell_cb = fs_tell;
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fs_drv.dir_close_cb = fs_dir_close;
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fs_drv.dir_open_cb = fs_dir_open;
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fs_drv.dir_read_cb = fs_dir_read;
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lv_fs_drv_register(&fs_drv);
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}
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/**********************
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* STATIC FUNCTIONS
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**********************/
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/*Initialize your Storage device and File system.*/
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static void fs_init(void)
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{
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/*Initialize the SD card and FatFS itself.
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*Better to do it in your code to keep this library untouched for easy updating*/
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}
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/**
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* Open a file
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* @param drv pointer to a driver where this function belongs
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* @param path path to the file beginning with the driver letter (e.g. S:/folder/file.txt)
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* @param mode read: FS_MODE_RD, write: FS_MODE_WR, both: FS_MODE_RD | FS_MODE_WR
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* @return pointer to FIL struct or NULL in case of fail
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*/
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static void * fs_open(lv_fs_drv_t * drv, const char * path, lv_fs_mode_t mode)
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{
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LV_UNUSED(drv);
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uint8_t flags = 0;
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if(mode == LV_FS_MODE_WR) flags = FA_WRITE | FA_OPEN_ALWAYS;
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else if(mode == LV_FS_MODE_RD) flags = FA_READ;
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else if(mode == (LV_FS_MODE_WR | LV_FS_MODE_RD)) flags = FA_READ | FA_WRITE | FA_OPEN_ALWAYS;
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FIL * f = lv_mem_alloc(sizeof(FIL));
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if(f == NULL) return NULL;
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FRESULT res = f_open(f, path, flags);
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if(res == FR_OK) {
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return f;
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}
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else {
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lv_mem_free(f);
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return NULL;
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}
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}
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/**
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* Close an opened file
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* @param drv pointer to a driver where this function belongs
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* @param file_p pointer to a FIL variable. (opened with fs_open)
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* @return LV_FS_RES_OK: no error, the file is read
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* any error from lv_fs_res_t enum
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*/
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static lv_fs_res_t fs_close(lv_fs_drv_t * drv, void * file_p)
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{
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LV_UNUSED(drv);
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f_close(file_p);
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lv_mem_free(file_p);
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return LV_FS_RES_OK;
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}
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/**
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* Read data from an opened file
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* @param drv pointer to a driver where this function belongs
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* @param file_p pointer to a FIL variable.
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* @param buf pointer to a memory block where to store the read data
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* @param btr number of Bytes To Read
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* @param br the real number of read bytes (Byte Read)
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* @return LV_FS_RES_OK: no error, the file is read
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* any error from lv_fs_res_t enum
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*/
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static lv_fs_res_t fs_read(lv_fs_drv_t * drv, void * file_p, void * buf, uint32_t btr, uint32_t * br)
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{
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LV_UNUSED(drv);
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FRESULT res = f_read(file_p, buf, btr, (UINT *)br);
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if(res == FR_OK) return LV_FS_RES_OK;
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else return LV_FS_RES_UNKNOWN;
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}
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/**
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* Write into a file
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* @param drv pointer to a driver where this function belongs
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* @param file_p pointer to a FIL variable
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* @param buf pointer to a buffer with the bytes to write
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* @param btw Bytes To Write
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* @param bw the number of real written bytes (Bytes Written). NULL if unused.
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* @return LV_FS_RES_OK or any error from lv_fs_res_t enum
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*/
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static lv_fs_res_t fs_write(lv_fs_drv_t * drv, void * file_p, const void * buf, uint32_t btw, uint32_t * bw)
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{
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LV_UNUSED(drv);
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FRESULT res = f_write(file_p, buf, btw, (UINT *)bw);
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if(res == FR_OK) return LV_FS_RES_OK;
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else return LV_FS_RES_UNKNOWN;
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}
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/**
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* Set the read write pointer. Also expand the file size if necessary.
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* @param drv pointer to a driver where this function belongs
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* @param file_p pointer to a FIL variable. (opened with fs_open )
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* @param pos the new position of read write pointer
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* @param whence only LV_SEEK_SET is supported
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* @return LV_FS_RES_OK: no error, the file is read
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* any error from lv_fs_res_t enum
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*/
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static lv_fs_res_t fs_seek(lv_fs_drv_t * drv, void * file_p, uint32_t pos, lv_fs_whence_t whence)
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{
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LV_UNUSED(drv);
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switch(whence) {
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case LV_FS_SEEK_SET:
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f_lseek(file_p, pos);
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break;
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case LV_FS_SEEK_CUR:
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f_lseek(file_p, f_tell((FIL *)file_p) + pos);
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break;
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case LV_FS_SEEK_END:
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f_lseek(file_p, f_size((FIL *)file_p) + pos);
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break;
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default:
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break;
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}
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return LV_FS_RES_OK;
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}
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/**
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* Give the position of the read write pointer
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* @param drv pointer to a driver where this function belongs
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* @param file_p pointer to a FIL variable.
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* @param pos_p pointer to to store the result
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* @return LV_FS_RES_OK: no error, the file is read
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* any error from lv_fs_res_t enum
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*/
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static lv_fs_res_t fs_tell(lv_fs_drv_t * drv, void * file_p, uint32_t * pos_p)
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{
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LV_UNUSED(drv);
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*pos_p = f_tell((FIL *)file_p);
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return LV_FS_RES_OK;
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}
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/**
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* Initialize a 'DIR' variable for directory reading
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* @param drv pointer to a driver where this function belongs
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* @param path path to a directory
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* @return pointer to an initialized 'DIR' variable
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*/
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static void * fs_dir_open(lv_fs_drv_t * drv, const char * path)
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{
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LV_UNUSED(drv);
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DIR * d = lv_mem_alloc(sizeof(DIR));
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if(d == NULL) return NULL;
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FRESULT res = f_opendir(d, path);
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if(res != FR_OK) {
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lv_mem_free(d);
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d = NULL;
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}
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return d;
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}
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/**
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* Read the next filename from a directory.
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* The name of the directories will begin with '/'
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* @param drv pointer to a driver where this function belongs
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* @param dir_p pointer to an initialized 'DIR' variable
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* @param fn pointer to a buffer to store the filename
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* @return LV_FS_RES_OK or any error from lv_fs_res_t enum
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*/
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static lv_fs_res_t fs_dir_read(lv_fs_drv_t * drv, void * dir_p, char * fn)
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{
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LV_UNUSED(drv);
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FRESULT res;
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FILINFO fno;
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fn[0] = '\0';
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do {
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res = f_readdir(dir_p, &fno);
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if(res != FR_OK) return LV_FS_RES_UNKNOWN;
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if(fno.fattrib & AM_DIR) {
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fn[0] = '/';
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strcpy(&fn[1], fno.fname);
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}
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else strcpy(fn, fno.fname);
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} while(strcmp(fn, "/.") == 0 || strcmp(fn, "/..") == 0);
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return LV_FS_RES_OK;
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}
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/**
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* Close the directory reading
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* @param drv pointer to a driver where this function belongs
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* @param dir_p pointer to an initialized 'DIR' variable
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* @return LV_FS_RES_OK or any error from lv_fs_res_t enum
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*/
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static lv_fs_res_t fs_dir_close(lv_fs_drv_t * drv, void * dir_p)
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{
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LV_UNUSED(drv);
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f_closedir(dir_p);
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lv_mem_free(dir_p);
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return LV_FS_RES_OK;
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}
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#else /*LV_USE_FS_FATFS == 0*/
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#if defined(LV_FS_FATFS_LETTER) && LV_FS_FATFS_LETTER != '\0'
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#warning "LV_USE_FS_FATFS is not enabled but LV_FS_FATFS_LETTER is set"
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#endif
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#endif /*LV_USE_FS_POSIX*/
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