example1.cpp

00001 #include "mbed.h"
00002 #include "FATFileSystem.h"
00003 #include "SDBlockDevice.h"
00004 #include <stdio.h>
00005 #include <errno.h>
00006 /* mbed_retarget.h is included after errno.h so symbols are mapped to
00007  * consistent values for all toolchains */
00008 #include "platform/mbed_retarget.h"
00009 
00010 
00011 SDBlockDevice sd(MBED_CONF_APP_SPI_MOSI, MBED_CONF_APP_SPI_MISO, MBED_CONF_APP_SPI_CLK, MBED_CONF_APP_SPI_CS);
00012 FATFileSystem fs("sd", &sd);
00013 
00014 void return_error(int ret_val){
00015   if (ret_val)
00016     printf("Failure. %d\n", ret_val);
00017   else
00018     printf("done.\n");
00019 }
00020 
00021 void errno_error(void* ret_val){
00022   if (ret_val == NULL)
00023     printf(" Failure. %d \n", errno);
00024   else
00025     printf(" done.\n");
00026 }
00027 
00028 int main()
00029 {
00030     int error = 0;
00031     printf("Welcome to the filesystem example.\n");
00032 
00033     printf("Opening a new file, numbers.txt.");
00034     FILE* fd = fopen("/sd/numbers.txt", "w+");
00035     errno_error(fd);
00036 
00037     for (int i = 0; i < 20; i++){
00038         printf("Writing decimal numbers to a file (%d/20)\r", i);
00039         fprintf(fd, "%d\n", i);
00040     }
00041     printf("Writing decimal numbers to a file (20/20) done.\n");
00042 
00043     printf("Closing file.");
00044     fclose(fd);
00045     printf(" done.\n");
00046 
00047     printf("Re-opening file read-only.");
00048     fd = fopen("/sd/numbers.txt", "r");
00049     errno_error(fd);
00050 
00051     printf("Dumping file to screen.\n");
00052     char buff[16] = {0};
00053     while (!feof(fd)){
00054         int size = fread(&buff[0], 1, 15, fd);
00055         fwrite(&buff[0], 1, size, stdout);
00056     }
00057     printf("EOF.\n");
00058 
00059     printf("Closing file.");
00060     fclose(fd);
00061     printf(" done.\n");
00062 
00063     printf("Opening root directory.");
00064     DIR* dir = opendir("/sd/");
00065     errno_error(fd);
00066 
00067     struct dirent* de;
00068     printf("Printing all filenames:\n");
00069     while((de = readdir(dir)) != NULL){
00070         printf("  %s\n", &(de->d_name)[0]);
00071     }
00072 
00073     printf("Closeing root directory. ");
00074     error = closedir(dir);
00075     return_error(error);
00076     printf("Filesystem Demo complete.\n");
00077 
00078     while (true) {}
00079 }
00080