first commit for opensource

first commit for opensource

examples/fatfs/fatfs_sample.c

@@ -0,0 +1,57 @@
+#include "tos.h"
+#include "tos_hal.h"
+#include "ff.h"
+
+char workbuf[4096];
+
+void application_entry(void *arg)
+{
+    FRESULT res;
+    uint32_t length;
+    FIL file;
+    FATFS sd_fatfs;
+
+    res = f_mount(&sd_fatfs, "1:", 1);
+    if (res != FR_OK) {
+        printf("unknown fs. res = %d\ndo disk format....\n", res);
+        res = f_mkfs("1:", FM_ANY, 0, workbuf, sizeof(workbuf));
+        if (res == FR_OK) {
+            f_setlabel("0:sample");
+            res = f_mount(&sd_fatfs, "1:", 1);
+        } else {
+            printf("format error %d\n\r", res);
+        }
+    }
+
+    res = f_open(&file, "1://test_file.txt", FA_CREATE_ALWAYS | FA_WRITE);
+    if (res != FR_OK) {
+        printf("open file error:%d\n\r",res);
+    }
+
+    res = f_write(&file, "fatfs sample content", strlen("fatfs sample content"), &length);
+    if (res == FR_OK) {
+        printf("write ok: %d\n", length);
+        printf("write data:\n%s\n", "fatfs sample content");
+    } else {
+        printf("write error: %d\n", res);
+    }
+    f_close(&file);
+
+    res = f_open(&file, "1://test_file.txt", FA_OPEN_EXISTING | FA_READ);
+    if (res != FR_OK) {
+        printf("open file error: %d\n", res);
+    }
+
+    memset(workbuf, 0, sizeof(workbuf));
+    res = f_read(&file, workbuf, sizeof(workbuf), &length);
+    if (res == FR_OK) {
+        printf("read ok: %d\n",length);
+        printf("read data:\n%s\n", workbuf);
+    } else {
+        printf("read error: %d\n", res);
+    }
+    f_close(&file);
+		
+    f_sync(&file);
+}
+