sd reader testing
Dependencies: BD_SD_DISCO_F746NG
main.cpp
- Committer:
- roykrikke
- Date:
- 2018-03-24
- Revision:
- 2:993735af824b
- Parent:
- 1:ffacc9d0b308
- Child:
- 3:7f991a3d4e71
File content as of revision 2:993735af824b:
/* Example file of using SD/MMC Block device Library for MBED-OS * Copyright 2017 Roy Krikke * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * */ #include "mbed.h" #include "FATFileSystem.h" #include "BD_SD_DISCO_F746NG.h" #include <stdio.h> #include <errno.h> DigitalOut led (LED1); // Instantiate the Block Device for sd card on DISCO-F746NG BD_SD_DISCO_F746NG bd; 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 () { Serial pc (SERIAL_TX, SERIAL_RX); pc.baud (115200); printf ("Start\n"); 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 ("Closeing root directory. "); error = closedir (dir); return_error (error); printf ("Filesystem Demo complete.\r\n"); // Blink led with 2 Hz while (true) { led = !led; wait (0.5); } }