roman strizhev
/
mbed-os-example-FatFS
example FatFS, LittleFileSystem, BlockDevice
main.cpp@0:08256a8320ed, 2022-01-22 (annotated)
- Committer:
- romanstrizhev
- Date:
- Sat Jan 22 18:01:37 2022 +0000
- Revision:
- 0:08256a8320ed
FatFS example
Who changed what in which revision?
User | Revision | Line number | New contents of line |
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romanstrizhev | 0:08256a8320ed | 1 | /* Licensed under the Apache License, Version 2.0 (the "License"); |
romanstrizhev | 0:08256a8320ed | 2 | * you may not use this file except in compliance with the License. |
romanstrizhev | 0:08256a8320ed | 3 | * You may obtain a copy of the License at |
romanstrizhev | 0:08256a8320ed | 4 | * |
romanstrizhev | 0:08256a8320ed | 5 | * http://www.apache.org/licenses/LICENSE-2.0 |
romanstrizhev | 0:08256a8320ed | 6 | * |
romanstrizhev | 0:08256a8320ed | 7 | * Unless required by applicable law or agreed to in writing, software |
romanstrizhev | 0:08256a8320ed | 8 | * distributed under the License is distributed on an "AS IS" BASIS, |
romanstrizhev | 0:08256a8320ed | 9 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
romanstrizhev | 0:08256a8320ed | 10 | * See the License for the specific language governing permissions and |
romanstrizhev | 0:08256a8320ed | 11 | * limitations under the License. |
romanstrizhev | 0:08256a8320ed | 12 | */ |
romanstrizhev | 0:08256a8320ed | 13 | // https://github.com/ARMmbed/mbed-os-example-filesystem/blob/master/main.cpp |
romanstrizhev | 0:08256a8320ed | 14 | // LittleFileSystem OK! |
romanstrizhev | 0:08256a8320ed | 15 | // FATFileSystem OK! |
romanstrizhev | 0:08256a8320ed | 16 | |
romanstrizhev | 0:08256a8320ed | 17 | #include "mbed.h" |
romanstrizhev | 0:08256a8320ed | 18 | #include <stdio.h> |
romanstrizhev | 0:08256a8320ed | 19 | #include <errno.h> |
romanstrizhev | 0:08256a8320ed | 20 | #include <functional> |
romanstrizhev | 0:08256a8320ed | 21 | #include "BlockDevice.h" |
romanstrizhev | 0:08256a8320ed | 22 | |
romanstrizhev | 0:08256a8320ed | 23 | // Maximum number of elements in buffer |
romanstrizhev | 0:08256a8320ed | 24 | #define BUFFER_MAX_LEN 10 |
romanstrizhev | 0:08256a8320ed | 25 | #define FORCE_REFORMAT true |
romanstrizhev | 0:08256a8320ed | 26 | // This will take the system's default block device |
romanstrizhev | 0:08256a8320ed | 27 | BlockDevice *bd = BlockDevice::get_default_instance();// OK |
romanstrizhev | 0:08256a8320ed | 28 | |
romanstrizhev | 0:08256a8320ed | 29 | // Можно создать файловую систему в ОЗУ(куча, heap) |
romanstrizhev | 0:08256a8320ed | 30 | // Instead of the default block device, you can define your own block device. |
romanstrizhev | 0:08256a8320ed | 31 | // For example: HeapBlockDevice with size of 2048 bytes, read size 1, write size 1 and erase size 512. |
romanstrizhev | 0:08256a8320ed | 32 | //#include "HeapBlockDevice.h" |
romanstrizhev | 0:08256a8320ed | 33 | //BlockDevice *bd = new HeapBlockDevice(2048, 1, 1, 512);//OK! создает, но 2048 будет мало для эксперимента |
romanstrizhev | 0:08256a8320ed | 34 | //BlockDevice *bd = new HeapBlockDevice(1024*72, 1, 1, 512);//32kByte хватает для создания небольшой ФС в ОЗУ! (LittleFS, для FATFS - мало, 72kB - OK ) |
romanstrizhev | 0:08256a8320ed | 35 | |
romanstrizhev | 0:08256a8320ed | 36 | // This example uses LittleFileSystem as the default file system |
romanstrizhev | 0:08256a8320ed | 37 | //#include "LittleFileSystem.h" |
romanstrizhev | 0:08256a8320ed | 38 | //LittleFileSystem fs("fs");// OK!! |
romanstrizhev | 0:08256a8320ed | 39 | |
romanstrizhev | 0:08256a8320ed | 40 | // Uncomment the following two lines and comment the previous two to use FAT file system. |
romanstrizhev | 0:08256a8320ed | 41 | #include "FATFileSystem.h" |
romanstrizhev | 0:08256a8320ed | 42 | FATFileSystem fs("fs"); |
romanstrizhev | 0:08256a8320ed | 43 | |
romanstrizhev | 0:08256a8320ed | 44 | // Set up the button to trigger an erase |
romanstrizhev | 0:08256a8320ed | 45 | InterruptIn irq(BUTTON1);//OK повесим прерывание на пользовательскую кнопку |
romanstrizhev | 0:08256a8320ed | 46 | void erase() { |
romanstrizhev | 0:08256a8320ed | 47 | printf("Initializing the block device... "); |
romanstrizhev | 0:08256a8320ed | 48 | fflush(stdout); |
romanstrizhev | 0:08256a8320ed | 49 | int err = bd->init(); |
romanstrizhev | 0:08256a8320ed | 50 | printf("%s\n", (err ? "Fail :(" : "OK")); |
romanstrizhev | 0:08256a8320ed | 51 | if (err) { |
romanstrizhev | 0:08256a8320ed | 52 | error("error: %s (%d)\n", strerror(-err), err); |
romanstrizhev | 0:08256a8320ed | 53 | } |
romanstrizhev | 0:08256a8320ed | 54 | |
romanstrizhev | 0:08256a8320ed | 55 | printf("Erasing the block device... "); |
romanstrizhev | 0:08256a8320ed | 56 | fflush(stdout); |
romanstrizhev | 0:08256a8320ed | 57 | err = bd->erase(0, bd->size()); |
romanstrizhev | 0:08256a8320ed | 58 | printf("%s\n", (err ? "Fail :(" : "OK")); |
romanstrizhev | 0:08256a8320ed | 59 | if (err) { |
romanstrizhev | 0:08256a8320ed | 60 | error("error: %s (%d)\n", strerror(-err), err); |
romanstrizhev | 0:08256a8320ed | 61 | } |
romanstrizhev | 0:08256a8320ed | 62 | |
romanstrizhev | 0:08256a8320ed | 63 | printf("Deinitializing the block device... "); |
romanstrizhev | 0:08256a8320ed | 64 | fflush(stdout); |
romanstrizhev | 0:08256a8320ed | 65 | err = bd->deinit(); |
romanstrizhev | 0:08256a8320ed | 66 | printf("%s\n", (err ? "Fail :(" : "OK")); |
romanstrizhev | 0:08256a8320ed | 67 | if (err) { |
romanstrizhev | 0:08256a8320ed | 68 | error("error: %s (%d)\n", strerror(-err), err); |
romanstrizhev | 0:08256a8320ed | 69 | } |
romanstrizhev | 0:08256a8320ed | 70 | } |
romanstrizhev | 0:08256a8320ed | 71 | |
romanstrizhev | 0:08256a8320ed | 72 | static auto erase_event = mbed_event_queue()->make_user_allocated_event(erase);//OK |
romanstrizhev | 0:08256a8320ed | 73 | |
romanstrizhev | 0:08256a8320ed | 74 | |
romanstrizhev | 0:08256a8320ed | 75 | DigitalOut led(LED1); |
romanstrizhev | 0:08256a8320ed | 76 | |
romanstrizhev | 0:08256a8320ed | 77 | #define WAIT_MS 1000 |
romanstrizhev | 0:08256a8320ed | 78 | void wait(int ms){ |
romanstrizhev | 0:08256a8320ed | 79 | wait_us(ms*WAIT_MS); |
romanstrizhev | 0:08256a8320ed | 80 | } |
romanstrizhev | 0:08256a8320ed | 81 | |
romanstrizhev | 0:08256a8320ed | 82 | int main() |
romanstrizhev | 0:08256a8320ed | 83 | { |
romanstrizhev | 0:08256a8320ed | 84 | printf("START_default_1\n"); |
romanstrizhev | 0:08256a8320ed | 85 | //========================================================================================// |
romanstrizhev | 0:08256a8320ed | 86 | printf("--- Mbed OS filesystem example ---\n"); |
romanstrizhev | 0:08256a8320ed | 87 | |
romanstrizhev | 0:08256a8320ed | 88 | // Setup the erase event on button press, use the event queue |
romanstrizhev | 0:08256a8320ed | 89 | // to avoid running in interrupt context |
romanstrizhev | 0:08256a8320ed | 90 | irq.fall(std::ref(erase_event)); |
romanstrizhev | 0:08256a8320ed | 91 | |
romanstrizhev | 0:08256a8320ed | 92 | // Try to mount the filesystem |
romanstrizhev | 0:08256a8320ed | 93 | printf("Mounting the filesystem... "); |
romanstrizhev | 0:08256a8320ed | 94 | fflush(stdout); |
romanstrizhev | 0:08256a8320ed | 95 | int err = fs.mount(bd); |
romanstrizhev | 0:08256a8320ed | 96 | printf("%s\n", (err ? "Fail :(" : "OK")); |
romanstrizhev | 0:08256a8320ed | 97 | if (err || FORCE_REFORMAT) { |
romanstrizhev | 0:08256a8320ed | 98 | // Reformat if we can't mount the filesystem |
romanstrizhev | 0:08256a8320ed | 99 | printf("No filesystem found, formatting... "); |
romanstrizhev | 0:08256a8320ed | 100 | fflush(stdout); |
romanstrizhev | 0:08256a8320ed | 101 | err = fs.reformat(bd); |
romanstrizhev | 0:08256a8320ed | 102 | printf("%s\n", (err ? "Fail :(" : "OK")); |
romanstrizhev | 0:08256a8320ed | 103 | if (err) { |
romanstrizhev | 0:08256a8320ed | 104 | error("error: %s (%d)\n", strerror(-err), err); |
romanstrizhev | 0:08256a8320ed | 105 | } |
romanstrizhev | 0:08256a8320ed | 106 | } |
romanstrizhev | 0:08256a8320ed | 107 | |
romanstrizhev | 0:08256a8320ed | 108 | // Open the numbers file |
romanstrizhev | 0:08256a8320ed | 109 | printf("Opening \"/fs/numbers.txt\"... "); |
romanstrizhev | 0:08256a8320ed | 110 | fflush(stdout); |
romanstrizhev | 0:08256a8320ed | 111 | FILE *f = fopen("/fs/numbers.txt", "r+"); |
romanstrizhev | 0:08256a8320ed | 112 | printf("%s\n", (!f ? "Fail :(" : "OK")); |
romanstrizhev | 0:08256a8320ed | 113 | if (!f) { |
romanstrizhev | 0:08256a8320ed | 114 | // Create the numbers file if it doesn't exist |
romanstrizhev | 0:08256a8320ed | 115 | printf("No file found, creating a new file... "); |
romanstrizhev | 0:08256a8320ed | 116 | fflush(stdout); |
romanstrizhev | 0:08256a8320ed | 117 | f = fopen("/fs/numbers.txt", "w+"); |
romanstrizhev | 0:08256a8320ed | 118 | printf("%s\n", (!f ? "Fail :(" : "OK")); |
romanstrizhev | 0:08256a8320ed | 119 | if (!f) { |
romanstrizhev | 0:08256a8320ed | 120 | error("error: %s (%d)\n", strerror(errno), -errno); |
romanstrizhev | 0:08256a8320ed | 121 | } |
romanstrizhev | 0:08256a8320ed | 122 | |
romanstrizhev | 0:08256a8320ed | 123 | for (int i = 0; i < 10; i++) { |
romanstrizhev | 0:08256a8320ed | 124 | printf("\rWriting numbers (%d/%d)... ", i, 10); |
romanstrizhev | 0:08256a8320ed | 125 | fflush(stdout); |
romanstrizhev | 0:08256a8320ed | 126 | err = fprintf(f, " %d\n", i); |
romanstrizhev | 0:08256a8320ed | 127 | if (err < 0) { |
romanstrizhev | 0:08256a8320ed | 128 | printf("Fail :(\n"); |
romanstrizhev | 0:08256a8320ed | 129 | error("error: %s (%d)\n", strerror(errno), -errno); |
romanstrizhev | 0:08256a8320ed | 130 | } |
romanstrizhev | 0:08256a8320ed | 131 | } |
romanstrizhev | 0:08256a8320ed | 132 | printf("\rWriting numbers (%d/%d)... OK\n", 10, 10); |
romanstrizhev | 0:08256a8320ed | 133 | |
romanstrizhev | 0:08256a8320ed | 134 | printf("Seeking file... "); |
romanstrizhev | 0:08256a8320ed | 135 | fflush(stdout); |
romanstrizhev | 0:08256a8320ed | 136 | err = fseek(f, 0, SEEK_SET); |
romanstrizhev | 0:08256a8320ed | 137 | printf("%s\n", (err < 0 ? "Fail :(" : "OK")); |
romanstrizhev | 0:08256a8320ed | 138 | if (err < 0) { |
romanstrizhev | 0:08256a8320ed | 139 | error("error: %s (%d)\n", strerror(errno), -errno); |
romanstrizhev | 0:08256a8320ed | 140 | } |
romanstrizhev | 0:08256a8320ed | 141 | } |
romanstrizhev | 0:08256a8320ed | 142 | |
romanstrizhev | 0:08256a8320ed | 143 | // Go through and increment the numbers |
romanstrizhev | 0:08256a8320ed | 144 | for (int i = 0; i < 10; i++) { |
romanstrizhev | 0:08256a8320ed | 145 | printf("\rIncrementing numbers (%d/%d)... ", i, 10); |
romanstrizhev | 0:08256a8320ed | 146 | fflush(stdout); |
romanstrizhev | 0:08256a8320ed | 147 | |
romanstrizhev | 0:08256a8320ed | 148 | // Get current stream position |
romanstrizhev | 0:08256a8320ed | 149 | long pos = ftell(f); |
romanstrizhev | 0:08256a8320ed | 150 | |
romanstrizhev | 0:08256a8320ed | 151 | // Parse out the number and increment |
romanstrizhev | 0:08256a8320ed | 152 | char buf[BUFFER_MAX_LEN]; |
romanstrizhev | 0:08256a8320ed | 153 | if (!fgets(buf, BUFFER_MAX_LEN, f)) { |
romanstrizhev | 0:08256a8320ed | 154 | error("error: %s (%d)\n", strerror(errno), -errno); |
romanstrizhev | 0:08256a8320ed | 155 | } |
romanstrizhev | 0:08256a8320ed | 156 | char *endptr; |
romanstrizhev | 0:08256a8320ed | 157 | int32_t number = strtol(buf, &endptr, 10); |
romanstrizhev | 0:08256a8320ed | 158 | if ( |
romanstrizhev | 0:08256a8320ed | 159 | (errno == ERANGE) || // The number is too small/large |
romanstrizhev | 0:08256a8320ed | 160 | (endptr == buf) || // No character was read |
romanstrizhev | 0:08256a8320ed | 161 | (*endptr && *endptr != '\n') // The whole input was not converted |
romanstrizhev | 0:08256a8320ed | 162 | ) { |
romanstrizhev | 0:08256a8320ed | 163 | continue; |
romanstrizhev | 0:08256a8320ed | 164 | } |
romanstrizhev | 0:08256a8320ed | 165 | number += 1; |
romanstrizhev | 0:08256a8320ed | 166 | |
romanstrizhev | 0:08256a8320ed | 167 | // Seek to beginning of number |
romanstrizhev | 0:08256a8320ed | 168 | fseek(f, pos, SEEK_SET); |
romanstrizhev | 0:08256a8320ed | 169 | |
romanstrizhev | 0:08256a8320ed | 170 | // Store number |
romanstrizhev | 0:08256a8320ed | 171 | fprintf(f, " %d\n", number); |
romanstrizhev | 0:08256a8320ed | 172 | |
romanstrizhev | 0:08256a8320ed | 173 | // Flush between write and read on same file |
romanstrizhev | 0:08256a8320ed | 174 | fflush(f); |
romanstrizhev | 0:08256a8320ed | 175 | } |
romanstrizhev | 0:08256a8320ed | 176 | printf("\rIncrementing numbers (%d/%d)... OK\n", 10, 10); |
romanstrizhev | 0:08256a8320ed | 177 | |
romanstrizhev | 0:08256a8320ed | 178 | // Close the file which also flushes any cached writes |
romanstrizhev | 0:08256a8320ed | 179 | printf("Closing \"/fs/numbers.txt\"... "); |
romanstrizhev | 0:08256a8320ed | 180 | fflush(stdout); |
romanstrizhev | 0:08256a8320ed | 181 | err = fclose(f); |
romanstrizhev | 0:08256a8320ed | 182 | printf("%s\n", (err < 0 ? "Fail :(" : "OK")); |
romanstrizhev | 0:08256a8320ed | 183 | if (err < 0) { |
romanstrizhev | 0:08256a8320ed | 184 | error("error: %s (%d)\n", strerror(errno), -errno); |
romanstrizhev | 0:08256a8320ed | 185 | } |
romanstrizhev | 0:08256a8320ed | 186 | |
romanstrizhev | 0:08256a8320ed | 187 | // Display the root directory |
romanstrizhev | 0:08256a8320ed | 188 | printf("Opening the root directory... "); |
romanstrizhev | 0:08256a8320ed | 189 | fflush(stdout); |
romanstrizhev | 0:08256a8320ed | 190 | DIR *d = opendir("/fs/"); |
romanstrizhev | 0:08256a8320ed | 191 | printf("%s\n", (!d ? "Fail :(" : "OK")); |
romanstrizhev | 0:08256a8320ed | 192 | if (!d) { |
romanstrizhev | 0:08256a8320ed | 193 | error("error: %s (%d)\n", strerror(errno), -errno); |
romanstrizhev | 0:08256a8320ed | 194 | } |
romanstrizhev | 0:08256a8320ed | 195 | |
romanstrizhev | 0:08256a8320ed | 196 | printf("root directory:\n"); |
romanstrizhev | 0:08256a8320ed | 197 | while (true) { |
romanstrizhev | 0:08256a8320ed | 198 | struct dirent *e = readdir(d); |
romanstrizhev | 0:08256a8320ed | 199 | if (!e) { |
romanstrizhev | 0:08256a8320ed | 200 | break; |
romanstrizhev | 0:08256a8320ed | 201 | } |
romanstrizhev | 0:08256a8320ed | 202 | |
romanstrizhev | 0:08256a8320ed | 203 | printf(" %s\n", e->d_name); |
romanstrizhev | 0:08256a8320ed | 204 | } |
romanstrizhev | 0:08256a8320ed | 205 | |
romanstrizhev | 0:08256a8320ed | 206 | printf("Closing the root directory... "); |
romanstrizhev | 0:08256a8320ed | 207 | fflush(stdout); |
romanstrizhev | 0:08256a8320ed | 208 | err = closedir(d); |
romanstrizhev | 0:08256a8320ed | 209 | printf("%s\n", (err < 0 ? "Fail :(" : "OK")); |
romanstrizhev | 0:08256a8320ed | 210 | if (err < 0) { |
romanstrizhev | 0:08256a8320ed | 211 | error("error: %s (%d)\n", strerror(errno), -errno); |
romanstrizhev | 0:08256a8320ed | 212 | } |
romanstrizhev | 0:08256a8320ed | 213 | |
romanstrizhev | 0:08256a8320ed | 214 | // Display the numbers file |
romanstrizhev | 0:08256a8320ed | 215 | printf("Opening \"/fs/numbers.txt\"... "); |
romanstrizhev | 0:08256a8320ed | 216 | fflush(stdout); |
romanstrizhev | 0:08256a8320ed | 217 | f = fopen("/fs/numbers.txt", "r"); |
romanstrizhev | 0:08256a8320ed | 218 | printf("%s\n", (!f ? "Fail :(" : "OK")); |
romanstrizhev | 0:08256a8320ed | 219 | if (!f) { |
romanstrizhev | 0:08256a8320ed | 220 | error("error: %s (%d)\n", strerror(errno), -errno); |
romanstrizhev | 0:08256a8320ed | 221 | } |
romanstrizhev | 0:08256a8320ed | 222 | |
romanstrizhev | 0:08256a8320ed | 223 | printf("numbers:\n"); |
romanstrizhev | 0:08256a8320ed | 224 | while (!feof(f)) { |
romanstrizhev | 0:08256a8320ed | 225 | int c = fgetc(f); |
romanstrizhev | 0:08256a8320ed | 226 | printf("%c", c); |
romanstrizhev | 0:08256a8320ed | 227 | } |
romanstrizhev | 0:08256a8320ed | 228 | |
romanstrizhev | 0:08256a8320ed | 229 | printf("\rClosing \"/fs/numbers.txt\"... "); |
romanstrizhev | 0:08256a8320ed | 230 | fflush(stdout); |
romanstrizhev | 0:08256a8320ed | 231 | err = fclose(f); |
romanstrizhev | 0:08256a8320ed | 232 | printf("%s\n", (err < 0 ? "Fail :(" : "OK")); |
romanstrizhev | 0:08256a8320ed | 233 | if (err < 0) { |
romanstrizhev | 0:08256a8320ed | 234 | error("error: %s (%d)\n", strerror(errno), -errno); |
romanstrizhev | 0:08256a8320ed | 235 | } |
romanstrizhev | 0:08256a8320ed | 236 | |
romanstrizhev | 0:08256a8320ed | 237 | // Tidy up |
romanstrizhev | 0:08256a8320ed | 238 | printf("Unmounting... "); |
romanstrizhev | 0:08256a8320ed | 239 | fflush(stdout); |
romanstrizhev | 0:08256a8320ed | 240 | err = fs.unmount(); |
romanstrizhev | 0:08256a8320ed | 241 | printf("%s\n", (err < 0 ? "Fail :(" : "OK")); |
romanstrizhev | 0:08256a8320ed | 242 | if (err < 0) { |
romanstrizhev | 0:08256a8320ed | 243 | error("error: %s (%d)\n", strerror(-err), err); |
romanstrizhev | 0:08256a8320ed | 244 | } |
romanstrizhev | 0:08256a8320ed | 245 | |
romanstrizhev | 0:08256a8320ed | 246 | printf("Mbed OS filesystem example done!\n"); |
romanstrizhev | 0:08256a8320ed | 247 | |
romanstrizhev | 0:08256a8320ed | 248 | //========================================================================================// |
romanstrizhev | 0:08256a8320ed | 249 | while(1) { |
romanstrizhev | 0:08256a8320ed | 250 | // моргаем встроенным светодиодом |
romanstrizhev | 0:08256a8320ed | 251 | led = !led; |
romanstrizhev | 0:08256a8320ed | 252 | wait(100); |
romanstrizhev | 0:08256a8320ed | 253 | } |
romanstrizhev | 0:08256a8320ed | 254 | } |
romanstrizhev | 0:08256a8320ed | 255 |