Example of Mbed filesystem using HeapBlockDevice
Dependents: TemperatureButtonFile AccelleratorRead
Diff: main.cpp
- Revision:
- 0:8e251d9511b8
- Child:
- 1:2bfc377bcc2a
diff -r 000000000000 -r 8e251d9511b8 main.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/main.cpp Wed Dec 13 16:20:24 2017 +0000 @@ -0,0 +1,220 @@ +/* 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 "SDBlockDevice.h" +#include "HeapBlockDevice.h" + +// File systems +#include "LittleFileSystem.h" +#include "FATFileSystem.h" + + +// Physical block device, can be any device that supports the BlockDevice API +SPIFBlockDevice bd( + MBED_CONF_SPIF_DRIVER_SPI_MOSI, + MBED_CONF_SPIF_DRIVER_SPI_MISO, + MBED_CONF_SPIF_DRIVER_SPI_CLK, + MBED_CONF_SPIF_DRIVER_SPI_CS); + +// File system declaration +LittleFileSystem 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 irq in case we want to use it + irq.fall(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 + int32_t number; + fscanf(f, "%d", &number); + number += 1; + + // Seek to beginning of number + fseek(f, pos, SEEK_SET); + + // Store number + fprintf(f, " %d\n", number); + } + 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"); +} +