This example demonstrates how to use the Mbed OS file system on target RHOMBIO_L476DMW1K together with a Rhombio uSD Holder module. The example is based on mbed official mbed-os-example-filesystem with minor modifications.
You can find more information about the Mbed OS file system and other related pieces of the Mbed OS storage stack in the storage overview: https://os.mbed.com/docs/latest/reference/storage.html
main.cpp
- Committer:
- galonso@rhomb.io
- Date:
- 2019-09-19
- Revision:
- 5:37e9573e91f6
- Parent:
- 0:91eeaf1003ac
File content as of revision 5:37e9573e91f6:
/* mbed Microcontroller Library * Copyright (c) 2006-2013 ARM Limited * * 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 <stdio.h> #include <errno.h> // Block devices //#include "SPIFBlockDevice.h" //#include "DataFlashBlockDevice.h" #include "SDBlockDevice.h" //#include "HeapBlockDevice.h" // File systems //#include "LittleFileSystem.h" #include "FATFileSystem.h" //----------------------------------------------------------------------- // RHOMB.IO CARRIER BOARDS // INDICATE THE CORRECT "CHIP SELECT" PIN TO BE USED: // SPI_A_CS0 if Rhombio uSD Holder module is assembled on Slave_socket_1 // SPI_A_CS1 if Rhombio uSD Holder module is assembled on Slave_socket_2 // uncommnt here the proper one: //#define SD_CS SPI_A_CS0 #define SD_CS SPI_A_CS1 //----------------------------------------------------------------------- // Physical block device, can be any device that supports the BlockDevice API SDBlockDevice blockDevice(SPI_MOSI, SPI_MISO, SPI_SCK, SD_CS); // mosi, miso, sck, cs // File system declaration FATFileSystem fileSystem("fs"); // Entry point for the example int main() { printf("--- Mbed OS filesystem example ---\n"); // Try to mount the filesystem printf("Mounting the filesystem... "); fflush(stdout); int err = fileSystem.mount(&blockDevice); printf("%s\n", (err ? "Fail :(" : "OK")); if (err) { // Reformat if we can't mount the filesystem // this should only happen on the first boot printf("No filesystem found, formatting... "); fflush(stdout); err = fileSystem.reformat(&blockDevice); printf("%s\n", (err ? "Fail :(" : "OK")); if (err) { error("error: %s (%d)\n", strerror(-err), err); } } // Open the numbers file printf("Opening \"/fs/numbers.txt\"... "); fflush(stdout); FILE* f = fopen("/fs/numbers.txt", "r+"); printf("%s\n", (!f ? "Fail :(" : "OK")); if (!f) { // Create the numbers file if it doesn't exist printf("No file found, creating a new file... "); fflush(stdout); f = fopen("/fs/numbers.txt", "w+"); printf("%s\n", (!f ? "Fail :(" : "OK")); if (!f) { error("error: %s (%d)\n", strerror(errno), -errno); } for (int i = 0; i < 10; i++) { printf("\rWriting numbers (%d/%d)... ", i, 10); fflush(stdout); err = fprintf(f, " %d\n", i); if (err < 0) { printf("Fail :(\n"); error("error: %s (%d)\n", strerror(errno), -errno); } } printf("\rWriting numbers (%d/%d)... OK\n", 10, 10); printf("Seeking file... "); fflush(stdout); err = fseek(f, 0, SEEK_SET); printf("%s\n", (err < 0 ? "Fail :(" : "OK")); if (err < 0) { error("error: %s (%d)\n", strerror(errno), -errno); } } // Go through and increment the numbers for (int i = 0; i < 10; i++) { printf("\rIncrementing numbers (%d/%d)... ", i, 10); fflush(stdout); // Get current stream position long pos = ftell(f); // Parse out the number and increment int32_t number; fscanf(f, "%ld", &number); number += 1; // Seek to beginning of number fseek(f, pos, SEEK_SET); // Store number fprintf(f, " %ld\n", number); // Flush between write and read on same file fflush(f); } printf("\rIncrementing numbers (%d/%d)... OK\n", 10, 10); // Close the file which also flushes any cached writes printf("Closing \"/fs/numbers.txt\"... "); fflush(stdout); err = fclose(f); printf("%s\n", (err < 0 ? "Fail :(" : "OK")); if (err < 0) { error("error: %s (%d)\n", strerror(errno), -errno); } // Display the root directory printf("Opening the root directory... "); fflush(stdout); DIR* d = opendir("/fs/"); printf("%s\n", (!d ? "Fail :(" : "OK")); if (!d) { error("error: %s (%d)\n", strerror(errno), -errno); } printf("root directory:\n"); while (true) { struct dirent* e = readdir(d); if (!e) { break; } printf(" %s\n", e->d_name); } printf("Closing the root directory... "); fflush(stdout); err = closedir(d); printf("%s\n", (err < 0 ? "Fail :(" : "OK")); if (err < 0) { error("error: %s (%d)\n", strerror(errno), -errno); } // Display the numbers file printf("Opening \"/fs/numbers.txt\"... "); fflush(stdout); f = fopen("/fs/numbers.txt", "r"); printf("%s\n", (!f ? "Fail :(" : "OK")); if (!f) { error("error: %s (%d)\n", strerror(errno), -errno); } printf("numbers:\n"); while (!feof(f)) { int c = fgetc(f); printf("%c", c); } printf("\rClosing \"/fs/numbers.txt\"... "); fflush(stdout); err = fclose(f); printf("%s\n", (err < 0 ? "Fail :(" : "OK")); if (err < 0) { error("error: %s (%d)\n", strerror(errno), -errno); } // Tidy up printf("Unmounting... "); fflush(stdout); err = fileSystem.unmount(); printf("%s\n", (err < 0 ? "Fail :(" : "OK")); if (err < 0) { error("error: %s (%d)\n", strerror(-err), err); } printf("Initializing the block device... "); fflush(stdout); err = blockDevice.init(); printf("%s\n", (err ? "Fail :(" : "OK")); if (err) { error("error: %s (%d)\n", strerror(-err), err); } printf("Erasing the block device... "); fflush(stdout); err = blockDevice.erase(0, blockDevice.size()); printf("%s\n", (err ? "Fail :(" : "OK")); if (err) { error("error: %s (%d)\n", strerror(-err), err); } printf("Deinitializing the block device... "); fflush(stdout); err = blockDevice.deinit(); printf("%s\n", (err ? "Fail :(" : "OK")); if (err) { error("error: %s (%d)\n", strerror(-err), err); } printf("\r\n"); printf("Mbed OS filesystem example done!\n"); }