mbed-os-examples / Mbed OS mbed-os-example-mbed5-filesystem

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main.cpp@26:06d3aa3eff55, 2018-12-10 (annotated)

Committer:
mbed_official
Date:
Mon Dec 10 13:30:30 2018 +0000
Revision:
26:06d3aa3eff55
Parent:
25:65a9183a2178
Child:
28:bc8560ba955d
Use BlockDevice get_default_instance method to determine block device



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Commit copied from https://github.com/ARMmbed/mbed-os-example-filesystem

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 0:8e251d9511b8 1 /* mbed Microcontroller Library
mbed_official 0:8e251d9511b8 2 * Copyright (c) 2006-2013 ARM Limited
mbed_official 0:8e251d9511b8 3 *
mbed_official 0:8e251d9511b8 4 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 0:8e251d9511b8 5 * you may not use this file except in compliance with the License.
mbed_official 0:8e251d9511b8 6 * You may obtain a copy of the License at
mbed_official 0:8e251d9511b8 7 *
mbed_official 0:8e251d9511b8 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 0:8e251d9511b8 9 *
mbed_official 0:8e251d9511b8 10 * Unless required by applicable law or agreed to in writing, software
mbed_official 0:8e251d9511b8 11 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 0:8e251d9511b8 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 0:8e251d9511b8 13 * See the License for the specific language governing permissions and
mbed_official 0:8e251d9511b8 14 * limitations under the License.
mbed_official 0:8e251d9511b8 15 */
mbed_official 0:8e251d9511b8 16 #include "mbed.h"
mbed_official 0:8e251d9511b8 17 #include <stdio.h>
mbed_official 0:8e251d9511b8 18 #include <errno.h>
mbed_official 0:8e251d9511b8 19
mbed_official 26:06d3aa3eff55 20 #include "BlockDevice.h"
mbed_official 0:8e251d9511b8 21
mbed_official 0:8e251d9511b8 22 // File systems
mbed_official 0:8e251d9511b8 23 #include "LittleFileSystem.h"
mbed_official 0:8e251d9511b8 24 #include "FATFileSystem.h"
mbed_official 0:8e251d9511b8 25
mbed_official 0:8e251d9511b8 26
mbed_official 26:06d3aa3eff55 27 BlockDevice *bd = BlockDevice::get_default_instance();
mbed_official 0:8e251d9511b8 28
mbed_official 0:8e251d9511b8 29 // File system declaration
mbed_official 0:8e251d9511b8 30 LittleFileSystem fs("fs");
mbed_official 0:8e251d9511b8 31
mbed_official 0:8e251d9511b8 32
mbed_official 0:8e251d9511b8 33 // Set up the button to trigger an erase
mbed_official 0:8e251d9511b8 34 InterruptIn irq(BUTTON1);
mbed_official 0:8e251d9511b8 35 void erase() {
mbed_official 0:8e251d9511b8 36 printf("Initializing the block device... ");
mbed_official 0:8e251d9511b8 37 fflush(stdout);
mbed_official 26:06d3aa3eff55 38 int err = bd->init();
mbed_official 0:8e251d9511b8 39 printf("%s\n", (err ? "Fail :(" : "OK"));
mbed_official 0:8e251d9511b8 40 if (err) {
mbed_official 0:8e251d9511b8 41 error("error: %s (%d)\n", strerror(-err), err);
mbed_official 0:8e251d9511b8 42 }
mbed_official 0:8e251d9511b8 43
mbed_official 0:8e251d9511b8 44 printf("Erasing the block device... ");
mbed_official 0:8e251d9511b8 45 fflush(stdout);
mbed_official 26:06d3aa3eff55 46 err = bd->erase(0, bd->size());
mbed_official 0:8e251d9511b8 47 printf("%s\n", (err ? "Fail :(" : "OK"));
mbed_official 0:8e251d9511b8 48 if (err) {
mbed_official 0:8e251d9511b8 49 error("error: %s (%d)\n", strerror(-err), err);
mbed_official 0:8e251d9511b8 50 }
mbed_official 0:8e251d9511b8 51
mbed_official 0:8e251d9511b8 52 printf("Deinitializing the block device... ");
mbed_official 0:8e251d9511b8 53 fflush(stdout);
mbed_official 26:06d3aa3eff55 54 err = bd->deinit();
mbed_official 0:8e251d9511b8 55 printf("%s\n", (err ? "Fail :(" : "OK"));
mbed_official 0:8e251d9511b8 56 if (err) {
mbed_official 0:8e251d9511b8 57 error("error: %s (%d)\n", strerror(-err), err);
mbed_official 0:8e251d9511b8 58 }
mbed_official 0:8e251d9511b8 59 }
mbed_official 0:8e251d9511b8 60
mbed_official 0:8e251d9511b8 61
mbed_official 0:8e251d9511b8 62 // Entry point for the example
mbed_official 0:8e251d9511b8 63 int main() {
mbed_official 0:8e251d9511b8 64 printf("--- Mbed OS filesystem example ---\n");
mbed_official 0:8e251d9511b8 65
mbed_official 12:a07d0af60cc6 66 // Setup the erase event on button press, use the event queue
mbed_official 12:a07d0af60cc6 67 // to avoid running in interrupt context
mbed_official 12:a07d0af60cc6 68 irq.fall(mbed_event_queue()->event(erase));
mbed_official 0:8e251d9511b8 69
mbed_official 0:8e251d9511b8 70 // Try to mount the filesystem
mbed_official 0:8e251d9511b8 71 printf("Mounting the filesystem... ");
mbed_official 0:8e251d9511b8 72 fflush(stdout);
mbed_official 26:06d3aa3eff55 73 int err = fs.mount(bd);
mbed_official 0:8e251d9511b8 74 printf("%s\n", (err ? "Fail :(" : "OK"));
mbed_official 0:8e251d9511b8 75 if (err) {
mbed_official 0:8e251d9511b8 76 // Reformat if we can't mount the filesystem
mbed_official 0:8e251d9511b8 77 // this should only happen on the first boot
mbed_official 0:8e251d9511b8 78 printf("No filesystem found, formatting... ");
mbed_official 0:8e251d9511b8 79 fflush(stdout);
mbed_official 26:06d3aa3eff55 80 err = fs.reformat(bd);
mbed_official 0:8e251d9511b8 81 printf("%s\n", (err ? "Fail :(" : "OK"));
mbed_official 0:8e251d9511b8 82 if (err) {
mbed_official 0:8e251d9511b8 83 error("error: %s (%d)\n", strerror(-err), err);
mbed_official 0:8e251d9511b8 84 }
mbed_official 0:8e251d9511b8 85 }
mbed_official 0:8e251d9511b8 86
mbed_official 0:8e251d9511b8 87 // Open the numbers file
mbed_official 0:8e251d9511b8 88 printf("Opening \"/fs/numbers.txt\"... ");
mbed_official 0:8e251d9511b8 89 fflush(stdout);
mbed_official 0:8e251d9511b8 90 FILE *f = fopen("/fs/numbers.txt", "r+");
mbed_official 0:8e251d9511b8 91 printf("%s\n", (!f ? "Fail :(" : "OK"));
mbed_official 0:8e251d9511b8 92 if (!f) {
mbed_official 0:8e251d9511b8 93 // Create the numbers file if it doesn't exist
mbed_official 0:8e251d9511b8 94 printf("No file found, creating a new file... ");
mbed_official 0:8e251d9511b8 95 fflush(stdout);
mbed_official 0:8e251d9511b8 96 f = fopen("/fs/numbers.txt", "w+");
mbed_official 0:8e251d9511b8 97 printf("%s\n", (!f ? "Fail :(" : "OK"));
mbed_official 0:8e251d9511b8 98 if (!f) {
mbed_official 0:8e251d9511b8 99 error("error: %s (%d)\n", strerror(errno), -errno);
mbed_official 0:8e251d9511b8 100 }
mbed_official 0:8e251d9511b8 101
mbed_official 0:8e251d9511b8 102 for (int i = 0; i < 10; i++) {
mbed_official 0:8e251d9511b8 103 printf("\rWriting numbers (%d/%d)... ", i, 10);
mbed_official 0:8e251d9511b8 104 fflush(stdout);
mbed_official 0:8e251d9511b8 105 err = fprintf(f, " %d\n", i);
mbed_official 0:8e251d9511b8 106 if (err < 0) {
mbed_official 0:8e251d9511b8 107 printf("Fail :(\n");
mbed_official 0:8e251d9511b8 108 error("error: %s (%d)\n", strerror(errno), -errno);
mbed_official 0:8e251d9511b8 109 }
mbed_official 0:8e251d9511b8 110 }
mbed_official 0:8e251d9511b8 111 printf("\rWriting numbers (%d/%d)... OK\n", 10, 10);
mbed_official 0:8e251d9511b8 112
mbed_official 0:8e251d9511b8 113 printf("Seeking file... ");
mbed_official 0:8e251d9511b8 114 fflush(stdout);
mbed_official 0:8e251d9511b8 115 err = fseek(f, 0, SEEK_SET);
mbed_official 0:8e251d9511b8 116 printf("%s\n", (err < 0 ? "Fail :(" : "OK"));
mbed_official 0:8e251d9511b8 117 if (err < 0) {
mbed_official 0:8e251d9511b8 118 error("error: %s (%d)\n", strerror(errno), -errno);
mbed_official 0:8e251d9511b8 119 }
mbed_official 0:8e251d9511b8 120 }
mbed_official 0:8e251d9511b8 121
mbed_official 0:8e251d9511b8 122 // Go through and increment the numbers
mbed_official 0:8e251d9511b8 123 for (int i = 0; i < 10; i++) {
mbed_official 0:8e251d9511b8 124 printf("\rIncrementing numbers (%d/%d)... ", i, 10);
mbed_official 0:8e251d9511b8 125 fflush(stdout);
mbed_official 0:8e251d9511b8 126
mbed_official 0:8e251d9511b8 127 // Get current stream position
mbed_official 0:8e251d9511b8 128 long pos = ftell(f);
mbed_official 0:8e251d9511b8 129
mbed_official 0:8e251d9511b8 130 // Parse out the number and increment
mbed_official 0:8e251d9511b8 131 int32_t number;
mbed_official 0:8e251d9511b8 132 fscanf(f, "%d", &number);
mbed_official 0:8e251d9511b8 133 number += 1;
mbed_official 0:8e251d9511b8 134
mbed_official 0:8e251d9511b8 135 // Seek to beginning of number
mbed_official 0:8e251d9511b8 136 fseek(f, pos, SEEK_SET);
mbed_official 0:8e251d9511b8 137
mbed_official 0:8e251d9511b8 138 // Store number
mbed_official 0:8e251d9511b8 139 fprintf(f, " %d\n", number);
mbed_official 10:38d6b74b0eb7 140
mbed_official 10:38d6b74b0eb7 141 // Flush between write and read on same file
mbed_official 10:38d6b74b0eb7 142 fflush(f);
mbed_official 0:8e251d9511b8 143 }
mbed_official 0:8e251d9511b8 144 printf("\rIncrementing numbers (%d/%d)... OK\n", 10, 10);
mbed_official 0:8e251d9511b8 145
mbed_official 0:8e251d9511b8 146 // Close the file which also flushes any cached writes
mbed_official 0:8e251d9511b8 147 printf("Closing \"/fs/numbers.txt\"... ");
mbed_official 0:8e251d9511b8 148 fflush(stdout);
mbed_official 0:8e251d9511b8 149 err = fclose(f);
mbed_official 0:8e251d9511b8 150 printf("%s\n", (err < 0 ? "Fail :(" : "OK"));
mbed_official 0:8e251d9511b8 151 if (err < 0) {
mbed_official 0:8e251d9511b8 152 error("error: %s (%d)\n", strerror(errno), -errno);
mbed_official 0:8e251d9511b8 153 }
mbed_official 0:8e251d9511b8 154
mbed_official 0:8e251d9511b8 155 // Display the root directory
mbed_official 0:8e251d9511b8 156 printf("Opening the root directory... ");
mbed_official 0:8e251d9511b8 157 fflush(stdout);
mbed_official 0:8e251d9511b8 158 DIR *d = opendir("/fs/");
mbed_official 0:8e251d9511b8 159 printf("%s\n", (!d ? "Fail :(" : "OK"));
mbed_official 0:8e251d9511b8 160 if (!d) {
mbed_official 0:8e251d9511b8 161 error("error: %s (%d)\n", strerror(errno), -errno);
mbed_official 0:8e251d9511b8 162 }
mbed_official 0:8e251d9511b8 163
mbed_official 0:8e251d9511b8 164 printf("root directory:\n");
mbed_official 0:8e251d9511b8 165 while (true) {
mbed_official 0:8e251d9511b8 166 struct dirent *e = readdir(d);
mbed_official 0:8e251d9511b8 167 if (!e) {
mbed_official 0:8e251d9511b8 168 break;
mbed_official 0:8e251d9511b8 169 }
mbed_official 0:8e251d9511b8 170
mbed_official 0:8e251d9511b8 171 printf(" %s\n", e->d_name);
mbed_official 0:8e251d9511b8 172 }
mbed_official 0:8e251d9511b8 173
mbed_official 0:8e251d9511b8 174 printf("Closing the root directory... ");
mbed_official 0:8e251d9511b8 175 fflush(stdout);
mbed_official 0:8e251d9511b8 176 err = closedir(d);
mbed_official 0:8e251d9511b8 177 printf("%s\n", (err < 0 ? "Fail :(" : "OK"));
mbed_official 0:8e251d9511b8 178 if (err < 0) {
mbed_official 0:8e251d9511b8 179 error("error: %s (%d)\n", strerror(errno), -errno);
mbed_official 0:8e251d9511b8 180 }
mbed_official 0:8e251d9511b8 181
mbed_official 0:8e251d9511b8 182 // Display the numbers file
mbed_official 0:8e251d9511b8 183 printf("Opening \"/fs/numbers.txt\"... ");
mbed_official 0:8e251d9511b8 184 fflush(stdout);
mbed_official 0:8e251d9511b8 185 f = fopen("/fs/numbers.txt", "r");
mbed_official 0:8e251d9511b8 186 printf("%s\n", (!f ? "Fail :(" : "OK"));
mbed_official 0:8e251d9511b8 187 if (!f) {
mbed_official 0:8e251d9511b8 188 error("error: %s (%d)\n", strerror(errno), -errno);
mbed_official 0:8e251d9511b8 189 }
mbed_official 0:8e251d9511b8 190
mbed_official 0:8e251d9511b8 191 printf("numbers:\n");
mbed_official 0:8e251d9511b8 192 while (!feof(f)) {
mbed_official 0:8e251d9511b8 193 int c = fgetc(f);
mbed_official 0:8e251d9511b8 194 printf("%c", c);
mbed_official 0:8e251d9511b8 195 }
mbed_official 0:8e251d9511b8 196
mbed_official 0:8e251d9511b8 197 printf("\rClosing \"/fs/numbers.txt\"... ");
mbed_official 0:8e251d9511b8 198 fflush(stdout);
mbed_official 0:8e251d9511b8 199 err = fclose(f);
mbed_official 0:8e251d9511b8 200 printf("%s\n", (err < 0 ? "Fail :(" : "OK"));
mbed_official 0:8e251d9511b8 201 if (err < 0) {
mbed_official 0:8e251d9511b8 202 error("error: %s (%d)\n", strerror(errno), -errno);
mbed_official 0:8e251d9511b8 203 }
mbed_official 0:8e251d9511b8 204
mbed_official 0:8e251d9511b8 205 // Tidy up
mbed_official 0:8e251d9511b8 206 printf("Unmounting... ");
mbed_official 0:8e251d9511b8 207 fflush(stdout);
mbed_official 0:8e251d9511b8 208 err = fs.unmount();
mbed_official 0:8e251d9511b8 209 printf("%s\n", (err < 0 ? "Fail :(" : "OK"));
mbed_official 0:8e251d9511b8 210 if (err < 0) {
mbed_official 0:8e251d9511b8 211 error("error: %s (%d)\n", strerror(-err), err);
mbed_official 0:8e251d9511b8 212 }
mbed_official 0:8e251d9511b8 213
mbed_official 0:8e251d9511b8 214 printf("Mbed OS filesystem example done!\n");
mbed_official 0:8e251d9511b8 215 }
mbed_official 0:8e251d9511b8 216