107 lines
3.5 KiB
C
107 lines
3.5 KiB
C
/* SD card and FAT filesystem example.
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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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*/
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#include <stdio.h>
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#include <string.h>
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#include <sys/unistd.h>
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#include <sys/stat.h>
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#include "esp_err.h"
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#include "esp_log.h"
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#include "esp_vfs_fat.h"
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#include "driver/sdmmc_host.h"
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#include "driver/sdmmc_defs.h"
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#include "sdmmc_cmd.h"
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static const char* TAG = "example";
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void app_main(void)
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{
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ESP_LOGI(TAG, "Initializing SD card");
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sdmmc_host_t host = SDMMC_HOST_DEFAULT();
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// To use 1-line SD mode, uncomment the following line:
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// host.flags = SDMMC_HOST_FLAG_1BIT;
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// This initializes the slot without card detect (CD) and write protect (WP) signals.
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// Modify slot_config.gpio_cd and slot_config.gpio_wp if your board has these signals.
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sdmmc_slot_config_t slot_config = SDMMC_SLOT_CONFIG_DEFAULT();
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// Options for mounting the filesystem.
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// If format_if_mount_failed is set to true, SD card will be partitioned and formatted
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// in case when mounting fails.
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esp_vfs_fat_sdmmc_mount_config_t mount_config = {
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.format_if_mount_failed = false,
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.max_files = 5
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};
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// Use settings defined above to initialize SD card and mount FAT filesystem.
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// Note: esp_vfs_fat_sdmmc_mount is an all-in-one convenience function.
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// Please check its source code and implement error recovery when developing
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// production applications.
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sdmmc_card_t* card;
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esp_err_t ret = esp_vfs_fat_sdmmc_mount("/sdcard", &host, &slot_config, &mount_config, &card);
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if (ret != ESP_OK) {
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if (ret == ESP_FAIL) {
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ESP_LOGE(TAG, "Failed to mount filesystem. If you want the card to be formatted, set format_if_mount_failed = true.");
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} else {
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ESP_LOGE(TAG, "Failed to initialize the card (%d). Make sure SD card lines have pull-up resistors in place.", ret);
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}
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return;
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}
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// Card has been initialized, print its properties
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sdmmc_card_print_info(stdout, card);
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// Use POSIX and C standard library functions to work with files.
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// First create a file.
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ESP_LOGI(TAG, "Opening file");
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FILE* f = fopen("/sdcard/hello.txt", "w");
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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, "Hello %s!\n", card->cid.name);
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fclose(f);
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ESP_LOGI(TAG, "File written");
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// Check if destination file exists before renaming
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struct stat st;
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if (stat("/sdcard/foo.txt", &st) == 0) {
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// Delete it if it exists
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unlink("/sdcard/foo.txt");
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}
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// Rename original file
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ESP_LOGI(TAG, "Renaming file");
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if (rename("/sdcard/hello.txt", "/sdcard/foo.txt") != 0) {
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ESP_LOGE(TAG, "Rename failed");
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return;
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}
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// Open renamed file for reading
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ESP_LOGI(TAG, "Reading file");
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f = fopen("/sdcard/foo.txt", "r");
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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[64];
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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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// All done, unmount partition and disable SDMMC host peripheral
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esp_vfs_fat_sdmmc_unmount();
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ESP_LOGI(TAG, "Card unmounted");
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}
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