![](/media/cache/group/Mbed-100-mk2.png.50x50_q85.png)
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main.cpp
- Committer:
- mbed_official
- Date:
- 2019-11-22
- Revision:
- 33:3a0681d09e16
- Parent:
- 32:decaa56b2fd0
File content as of revision 33:3a0681d09e16:
/* mbed Microcontroller Library * Copyright (c) 2006-2019 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> #include "BlockDevice.h" // Maximum number of elements in buffer #define BUFFER_MAX_LEN 10 // This will take the system's default block device BlockDevice *bd = BlockDevice::get_default_instance(); // Instead of the default block device, you can define your own block device. // For example: HeapBlockDevice with size of 2048 bytes, read size 1, write size 1 and erase size 512. // #include "HeapBlockDevice.h" // BlockDevice *bd = new HeapBlockDevice(2048, 1, 1, 512); // This example uses LittleFileSystem as the default file system #include "LittleFileSystem.h" LittleFileSystem fs("fs"); // Uncomment the following two lines and comment the previous two to use FAT file system. // #include "FATFileSystem.h" // FATFileSystem fs("fs"); // Set up the button to trigger an erase InterruptIn irq(BUTTON1); void erase() { printf("Initializing the block device... "); fflush(stdout); int err = bd->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 = bd->erase(0, bd->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 = bd->deinit(); printf("%s\n", (err ? "Fail :(" : "OK")); if (err) { error("error: %s (%d)\n", strerror(-err), err); } } // Entry point for the example int main() { printf("--- Mbed OS filesystem example ---\n"); // Setup the erase event on button press, use the event queue // to avoid running in interrupt context irq.fall(mbed_event_queue()->event(erase)); // Try to mount the filesystem printf("Mounting the filesystem... "); fflush(stdout); int err = fs.mount(bd); 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 = fs.reformat(bd); 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 char buf[BUFFER_MAX_LEN]; if (!fgets(buf, BUFFER_MAX_LEN, f)) { error("error: %s (%d)\n", strerror(errno), -errno); } char *endptr; int32_t number = strtol(buf, &endptr, 10); if ( (errno == ERANGE) || // The number is too small/large (endptr == buf) || // No character was read (*endptr && *endptr != '\n') // The whole input was not converted ) { continue; } number += 1; // Seek to beginning of number fseek(f, pos, SEEK_SET); // Store number fprintf(f, " %d\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 = fs.unmount(); printf("%s\n", (err < 0 ? "Fail :(" : "OK")); if (err < 0) { error("error: %s (%d)\n", strerror(-err), err); } printf("Mbed OS filesystem example done!\n"); }