mbed-os-examples
/
mbed-os-example-fat-filesystem
.
main.cpp
- Committer:
- mbed_official
- Date:
- 2018-05-10
- Revision:
- 15:9b74f9eb0a51
- Parent:
- 14:49106ed7c2cf
File content as of revision 15:9b74f9eb0a51:
#include "mbed.h" #include "FATFileSystem.h" #include "HeapBlockDevice.h" #include <stdio.h> #include <errno.h> HeapBlockDevice bd(128 * 512, 512); FATFileSystem fs("fs"); void return_error(int ret_val){ if (ret_val) printf("Failure. %d\r\n", ret_val); else printf("done.\r\n"); } void errno_error(void* ret_val){ if (ret_val == NULL) printf(" Failure. %d \r\n", errno); else printf(" done.\r\n"); } int main() { int error = 0; printf("Welcome to the filesystem example.\r\n" "Formatting a FAT, RAM-backed filesystem. "); error = FATFileSystem::format(&bd); return_error(error); printf("Mounting the filesystem on \"/fs\". "); error = fs.mount(&bd); return_error(error); printf("Opening a new file, numbers.txt."); FILE* fd = fopen("/fs/numbers.txt", "w"); errno_error(fd); for (int i = 0; i < 20; i++){ printf("Writing decimal numbers to a file (%d/20)\r", i); fprintf(fd, "%d\r\n", i); } printf("Writing decimal numbers to a file (20/20) done.\r\n"); printf("Closing file."); fclose(fd); printf(" done.\r\n"); printf("Re-opening file read-only."); fd = fopen("/fs/numbers.txt", "r"); errno_error(fd); printf("Dumping file to screen.\r\n"); char buff[16] = {0}; while (!feof(fd)){ int size = fread(&buff[0], 1, 15, fd); fwrite(&buff[0], 1, size, stdout); } printf("EOF.\r\n"); printf("Closing file."); fclose(fd); printf(" done.\r\n"); printf("Opening root directory."); DIR* dir = opendir("/fs/"); errno_error(fd); struct dirent* de; printf("Printing all filenames:\r\n"); while((de = readdir(dir)) != NULL){ printf(" %s\r\n", &(de->d_name)[0]); } printf("Closing root directory. "); error = closedir(dir); return_error(error); printf("Filesystem Demo complete.\r\n"); while (true) {} }