kopia lustrzana https://github.com/espressif/esp-idf
194 wiersze
6.4 KiB
C
194 wiersze
6.4 KiB
C
/* Example of FAT filesystem on external Flash.
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This example code is in the Public Domain (or CC0 licensed, at your option.)
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Unless required by applicable law or agreed to in writing, this
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software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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CONDITIONS OF ANY KIND, either express or implied.
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This sample shows how to store files inside a FAT filesystem.
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FAT filesystem is stored in a partition inside SPI flash, using the
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flash wear levelling library.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include "esp_flash.h"
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#include "esp_flash_spi_init.h"
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#include "esp_partition.h"
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#include "esp_vfs.h"
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#include "esp_vfs_fat.h"
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#include "esp_system.h"
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#include "soc/spi_pins.h"
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static const char *TAG = "example";
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// Handle of the wear levelling library instance
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static wl_handle_t s_wl_handle = WL_INVALID_HANDLE;
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// Mount path for the partition
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const char *base_path = "/extflash";
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static esp_flash_t* example_init_ext_flash(void);
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static const esp_partition_t* example_add_partition(esp_flash_t* ext_flash, const char* partition_label);
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static void example_list_data_partitions(void);
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static bool example_mount_fatfs(const char* partition_label);
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static void example_get_fatfs_usage(size_t* out_total_bytes, size_t* out_free_bytes);
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void app_main(void)
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{
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// Set up SPI bus and initialize the external SPI Flash chip
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esp_flash_t* flash = example_init_ext_flash();
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if (flash == NULL) {
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return;
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}
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// Add the entire external flash chip as a partition
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const char *partition_label = "storage";
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example_add_partition(flash, partition_label);
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// List the available partitions
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example_list_data_partitions();
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// Initialize FAT FS in the partition
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if (!example_mount_fatfs(partition_label)) {
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return;
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}
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// Print FAT FS size information
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size_t bytes_total, bytes_free;
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example_get_fatfs_usage(&bytes_total, &bytes_free);
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ESP_LOGI(TAG, "FAT FS: %d kB total, %d kB free", bytes_total / 1024, bytes_free / 1024);
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// Create a file in FAT FS
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ESP_LOGI(TAG, "Opening file");
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FILE *f = fopen("/extflash/hello.txt", "wb");
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if (f == NULL) {
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ESP_LOGE(TAG, "Failed to open file for writing");
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return;
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}
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fprintf(f, "Written using ESP-IDF %s\n", esp_get_idf_version());
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fclose(f);
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ESP_LOGI(TAG, "File written");
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// Open file for reading
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ESP_LOGI(TAG, "Reading file");
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f = fopen("/extflash/hello.txt", "rb");
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if (f == NULL) {
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ESP_LOGE(TAG, "Failed to open file for reading");
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return;
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}
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char line[128];
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fgets(line, sizeof(line), f);
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fclose(f);
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// strip newline
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char *pos = strchr(line, '\n');
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if (pos) {
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*pos = '\0';
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}
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ESP_LOGI(TAG, "Read from file: '%s'", line);
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}
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static esp_flash_t* example_init_ext_flash(void)
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{
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const spi_bus_config_t bus_config = {
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.mosi_io_num = VSPI_IOMUX_PIN_NUM_MOSI,
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.miso_io_num = VSPI_IOMUX_PIN_NUM_MISO,
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.sclk_io_num = VSPI_IOMUX_PIN_NUM_CLK,
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.quadhd_io_num = VSPI_IOMUX_PIN_NUM_HD,
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.quadwp_io_num = VSPI_IOMUX_PIN_NUM_WP,
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};
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const esp_flash_spi_device_config_t device_config = {
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.host_id = VSPI_HOST,
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.cs_id = 0,
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.cs_io_num = VSPI_IOMUX_PIN_NUM_CS,
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.io_mode = SPI_FLASH_DIO,
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.speed = ESP_FLASH_40MHZ,
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};
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ESP_LOGI(TAG, "Initializing external SPI Flash");
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ESP_LOGI(TAG, "Pin assignments:");
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ESP_LOGI(TAG, "MOSI: %2d MISO: %2d SCLK: %2d CS: %2d",
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bus_config.mosi_io_num, bus_config.miso_io_num,
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bus_config.sclk_io_num, device_config.cs_io_num
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);
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// Initialize the SPI bus
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ESP_ERROR_CHECK(spi_bus_initialize(VSPI_HOST, &bus_config, 1));
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// Add device to the SPI bus
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esp_flash_t* ext_flash;
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ESP_ERROR_CHECK(spi_bus_add_flash_device(&ext_flash, &device_config));
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// Probe the Flash chip and initialize it
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esp_err_t err = esp_flash_init(ext_flash);
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if (err != ESP_OK) {
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ESP_LOGE(TAG, "Failed to initialize external Flash: %s (0x%x)", esp_err_to_name(err), err);
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return NULL;
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}
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// Print out the ID and size
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uint32_t id;
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ESP_ERROR_CHECK(esp_flash_read_id(ext_flash, &id));
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ESP_LOGI(TAG, "Initialized external Flash, size=%d KB, ID=0x%x", ext_flash->size / 1024, id);
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return ext_flash;
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}
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static const esp_partition_t* example_add_partition(esp_flash_t* ext_flash, const char* partition_label)
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{
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ESP_LOGI(TAG, "Adding external Flash as a partition, label=\"%s\", size=%d KB", partition_label, ext_flash->size / 1024);
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const esp_partition_t* fat_partition;
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ESP_ERROR_CHECK(esp_partition_register_external(ext_flash, 0, ext_flash->size, partition_label, ESP_PARTITION_TYPE_DATA, ESP_PARTITION_SUBTYPE_DATA_FAT, &fat_partition));
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return fat_partition;
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}
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static void example_list_data_partitions(void)
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{
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ESP_LOGI(TAG, "Listing data partitions:");
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esp_partition_iterator_t it = esp_partition_find(ESP_PARTITION_TYPE_DATA, ESP_PARTITION_SUBTYPE_ANY, NULL);
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for (; it != NULL; it = esp_partition_next(it)) {
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const esp_partition_t *part = esp_partition_get(it);
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ESP_LOGI(TAG, "- partition '%s', subtype %d, offset 0x%x, size %d kB",
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part->label, part->subtype, part->address, part->size / 1024);
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}
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esp_partition_iterator_release(it);
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}
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static bool example_mount_fatfs(const char* partition_label)
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{
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ESP_LOGI(TAG, "Mounting FAT filesystem");
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const esp_vfs_fat_mount_config_t mount_config = {
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.max_files = 4,
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.format_if_mount_failed = true,
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.allocation_unit_size = CONFIG_WL_SECTOR_SIZE
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};
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esp_err_t err = esp_vfs_fat_spiflash_mount(base_path, partition_label, &mount_config, &s_wl_handle);
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if (err != ESP_OK) {
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ESP_LOGE(TAG, "Failed to mount FATFS (%s)", esp_err_to_name(err));
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return false;
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}
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return true;
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}
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static void example_get_fatfs_usage(size_t* out_total_bytes, size_t* out_free_bytes)
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{
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FATFS *fs;
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size_t free_clusters;
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int res = f_getfree("0:", &free_clusters, &fs);
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assert(res == FR_OK);
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size_t total_sectors = (fs->n_fatent - 2) * fs->csize;
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size_t free_sectors = free_clusters * fs->csize;
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// assuming the total size is < 4GiB, should be true for SPI Flash
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if (out_total_bytes != NULL) {
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*out_total_bytes = total_sectors * fs->ssize;
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}
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if (out_free_bytes != NULL) {
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*out_free_bytes = free_sectors * fs->ssize;
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}
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}
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