kopia lustrzana https://github.com/espressif/esp-idf
233 wiersze
7.3 KiB
C
233 wiersze
7.3 KiB
C
/* SD card and FAT filesystem example.
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This example uses SPI peripheral to communicate with SD card.
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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 <string.h>
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#include <sys/unistd.h>
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#include <sys/stat.h>
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#include "esp_vfs_fat.h"
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#include "sdmmc_cmd.h"
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#include "sd_test_io.h"
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#define EXAMPLE_MAX_CHAR_SIZE 64
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static const char *TAG = "example";
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#define MOUNT_POINT "/sdcard"
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#ifdef CONFIG_EXAMPLE_DEBUG_PIN_CONNECTIONS
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const char* names[] = {"CLK ", "MOSI", "MISO", "CS "};
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const int pins[] = {CONFIG_EXAMPLE_PIN_CLK,
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CONFIG_EXAMPLE_PIN_MOSI,
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CONFIG_EXAMPLE_PIN_MISO,
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CONFIG_EXAMPLE_PIN_CS};
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const int pin_count = sizeof(pins)/sizeof(pins[0]);
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#if CONFIG_EXAMPLE_ENABLE_ADC_FEATURE
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const int adc_channels[] = {CONFIG_EXAMPLE_ADC_PIN_CLK,
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CONFIG_EXAMPLE_ADC_PIN_MOSI,
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CONFIG_EXAMPLE_ADC_PIN_MISO,
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CONFIG_EXAMPLE_ADC_PIN_CS};
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#endif //CONFIG_EXAMPLE_ENABLE_ADC_FEATURE
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pin_configuration_t config = {
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.names = names,
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.pins = pins,
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#if CONFIG_EXAMPLE_ENABLE_ADC_FEATURE
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.adc_channels = adc_channels,
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#endif
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};
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#endif //CONFIG_EXAMPLE_DEBUG_PIN_CONNECTIONS
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// Pin assignments can be set in menuconfig, see "SD SPI Example Configuration" menu.
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// You can also change the pin assignments here by changing the following 4 lines.
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#define PIN_NUM_MISO CONFIG_EXAMPLE_PIN_MISO
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#define PIN_NUM_MOSI CONFIG_EXAMPLE_PIN_MOSI
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#define PIN_NUM_CLK CONFIG_EXAMPLE_PIN_CLK
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#define PIN_NUM_CS CONFIG_EXAMPLE_PIN_CS
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static esp_err_t s_example_write_file(const char *path, char *data)
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{
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ESP_LOGI(TAG, "Opening file %s", path);
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FILE *f = fopen(path, "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 ESP_FAIL;
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}
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fprintf(f, data);
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fclose(f);
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ESP_LOGI(TAG, "File written");
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return ESP_OK;
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}
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static esp_err_t s_example_read_file(const char *path)
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{
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ESP_LOGI(TAG, "Reading file %s", path);
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FILE *f = fopen(path, "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 ESP_FAIL;
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}
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char line[EXAMPLE_MAX_CHAR_SIZE];
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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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return ESP_OK;
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}
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void app_main(void)
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{
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esp_err_t ret;
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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
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// formatted in case when mounting fails.
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esp_vfs_fat_sdmmc_mount_config_t mount_config = {
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#ifdef CONFIG_EXAMPLE_FORMAT_IF_MOUNT_FAILED
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.format_if_mount_failed = true,
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#else
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.format_if_mount_failed = false,
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#endif // EXAMPLE_FORMAT_IF_MOUNT_FAILED
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.max_files = 5,
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.allocation_unit_size = 16 * 1024
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};
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sdmmc_card_t *card;
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const char mount_point[] = MOUNT_POINT;
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ESP_LOGI(TAG, "Initializing SD card");
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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/sdspi_mount is all-in-one convenience functions.
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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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ESP_LOGI(TAG, "Using SPI peripheral");
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// By default, SD card frequency is initialized to SDMMC_FREQ_DEFAULT (20MHz)
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// For setting a specific frequency, use host.max_freq_khz (range 400kHz - 20MHz for SDSPI)
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// Example: for fixed frequency of 10MHz, use host.max_freq_khz = 10000;
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sdmmc_host_t host = SDSPI_HOST_DEFAULT();
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spi_bus_config_t bus_cfg = {
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.mosi_io_num = PIN_NUM_MOSI,
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.miso_io_num = PIN_NUM_MISO,
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.sclk_io_num = PIN_NUM_CLK,
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.quadwp_io_num = -1,
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.quadhd_io_num = -1,
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.max_transfer_sz = 4000,
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};
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ret = spi_bus_initialize(host.slot, &bus_cfg, SDSPI_DEFAULT_DMA);
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if (ret != ESP_OK) {
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ESP_LOGE(TAG, "Failed to initialize bus.");
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return;
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}
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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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sdspi_device_config_t slot_config = SDSPI_DEVICE_CONFIG_DEFAULT();
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slot_config.gpio_cs = PIN_NUM_CS;
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slot_config.host_id = host.slot;
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ESP_LOGI(TAG, "Mounting filesystem");
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ret = esp_vfs_fat_sdspi_mount(mount_point, &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. "
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"If you want the card to be formatted, set the CONFIG_EXAMPLE_FORMAT_IF_MOUNT_FAILED menuconfig option.");
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} else {
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ESP_LOGE(TAG, "Failed to initialize the card (%s). "
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"Make sure SD card lines have pull-up resistors in place.", esp_err_to_name(ret));
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#ifdef CONFIG_EXAMPLE_DEBUG_PIN_CONNECTIONS
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check_sd_card_pins(&config, pin_count);
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#endif
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}
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return;
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}
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ESP_LOGI(TAG, "Filesystem mounted");
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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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const char *file_hello = MOUNT_POINT"/hello.txt";
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char data[EXAMPLE_MAX_CHAR_SIZE];
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snprintf(data, EXAMPLE_MAX_CHAR_SIZE, "%s %s!\n", "Hello", card->cid.name);
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ret = s_example_write_file(file_hello, data);
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if (ret != ESP_OK) {
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return;
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}
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const char *file_foo = MOUNT_POINT"/foo.txt";
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// Check if destination file exists before renaming
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struct stat st;
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if (stat(file_foo, &st) == 0) {
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// Delete it if it exists
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unlink(file_foo);
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}
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// Rename original file
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ESP_LOGI(TAG, "Renaming file %s to %s", file_hello, file_foo);
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if (rename(file_hello, file_foo) != 0) {
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ESP_LOGE(TAG, "Rename failed");
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return;
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}
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ret = s_example_read_file(file_foo);
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if (ret != ESP_OK) {
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return;
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}
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// Format FATFS
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#ifdef CONFIG_EXAMPLE_FORMAT_SD_CARD
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ret = esp_vfs_fat_sdcard_format(mount_point, card);
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if (ret != ESP_OK) {
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ESP_LOGE(TAG, "Failed to format FATFS (%s)", esp_err_to_name(ret));
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return;
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}
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if (stat(file_foo, &st) == 0) {
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ESP_LOGI(TAG, "file still exists");
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return;
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} else {
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ESP_LOGI(TAG, "file doesnt exist, format done");
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}
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#endif // CONFIG_EXAMPLE_FORMAT_SD_CARD
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const char *file_nihao = MOUNT_POINT"/nihao.txt";
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memset(data, 0, EXAMPLE_MAX_CHAR_SIZE);
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snprintf(data, EXAMPLE_MAX_CHAR_SIZE, "%s %s!\n", "Nihao", card->cid.name);
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ret = s_example_write_file(file_nihao, data);
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if (ret != ESP_OK) {
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return;
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}
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//Open file for reading
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ret = s_example_read_file(file_nihao);
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if (ret != ESP_OK) {
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return;
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}
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// All done, unmount partition and disable SPI peripheral
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esp_vfs_fat_sdcard_unmount(mount_point, card);
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ESP_LOGI(TAG, "Card unmounted");
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//deinitialize the bus after all devices are removed
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spi_bus_free(host.slot);
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}
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