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esp-idf/examples/storage/sd_card/sdmmc/main/sd_card_example_main.c

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/* SD card and FAT filesystem example.
This example code is in the Public Domain (or CC0 licensed, at your option.)
Unless required by applicable law or agreed to in writing, this
software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
CONDITIONS OF ANY KIND, either express or implied.
*/
// This example uses SDMMC peripheral to communicate with SD card.
#include <string.h>
#include <sys/unistd.h>
#include <sys/stat.h>
#include "esp_vfs_fat.h"
#include "sdmmc_cmd.h"
#include "driver/sdmmc_host.h"
#include "sd_test_io.h"
#include "sd_pwr_ctrl_by_on_chip_ldo.h"
#define EXAMPLE_MAX_CHAR_SIZE 64
static const char *TAG = "example";
#define MOUNT_POINT "/sdcard"
#ifdef CONFIG_EXAMPLE_DEBUG_PIN_CONNECTIONS
const char* names[] = {"CLK", "CMD", "D0", "D1", "D2", "D3"};
const int pins[] = {CONFIG_EXAMPLE_PIN_CLK,
CONFIG_EXAMPLE_PIN_CMD,
CONFIG_EXAMPLE_PIN_D0
#ifdef CONFIG_EXAMPLE_SDMMC_BUS_WIDTH_4
,CONFIG_EXAMPLE_PIN_D1,
CONFIG_EXAMPLE_PIN_D2,
CONFIG_EXAMPLE_PIN_D3
#endif
};
const int pin_count = sizeof(pins)/sizeof(pins[0]);
#if CONFIG_EXAMPLE_ENABLE_ADC_FEATURE
const int adc_channels[] = {CONFIG_EXAMPLE_ADC_PIN_CLK,
CONFIG_EXAMPLE_ADC_PIN_CMD,
CONFIG_EXAMPLE_ADC_PIN_D0
#ifdef CONFIG_EXAMPLE_SDMMC_BUS_WIDTH_4
,CONFIG_EXAMPLE_ADC_PIN_D1,
CONFIG_EXAMPLE_ADC_PIN_D2,
CONFIG_EXAMPLE_ADC_PIN_D3
#endif
};
#endif //CONFIG_EXAMPLE_ENABLE_ADC_FEATURE
pin_configuration_t config = {
.names = names,
.pins = pins,
#if CONFIG_EXAMPLE_ENABLE_ADC_FEATURE
.adc_channels = adc_channels,
#endif
};
#endif //CONFIG_EXAMPLE_DEBUG_PIN_CONNECTIONS
static esp_err_t s_example_write_file(const char *path, char *data)
{
ESP_LOGI(TAG, "Opening file %s", path);
FILE *f = fopen(path, "w");
if (f == NULL) {
ESP_LOGE(TAG, "Failed to open file for writing");
return ESP_FAIL;
}
fprintf(f, data);
fclose(f);
ESP_LOGI(TAG, "File written");
return ESP_OK;
}
static esp_err_t s_example_read_file(const char *path)
{
ESP_LOGI(TAG, "Reading file %s", path);
FILE *f = fopen(path, "r");
if (f == NULL) {
ESP_LOGE(TAG, "Failed to open file for reading");
return ESP_FAIL;
}
char line[EXAMPLE_MAX_CHAR_SIZE];
fgets(line, sizeof(line), f);
fclose(f);
// strip newline
char *pos = strchr(line, '\n');
if (pos) {
*pos = '\0';
}
ESP_LOGI(TAG, "Read from file: '%s'", line);
return ESP_OK;
}
void app_main(void)
{
esp_err_t ret;
// Options for mounting the filesystem.
// If format_if_mount_failed is set to true, SD card will be partitioned and
// formatted in case when mounting fails.
esp_vfs_fat_sdmmc_mount_config_t mount_config = {
#ifdef CONFIG_EXAMPLE_FORMAT_IF_MOUNT_FAILED
.format_if_mount_failed = true,
#else
.format_if_mount_failed = false,
#endif // EXAMPLE_FORMAT_IF_MOUNT_FAILED
.max_files = 5,
.allocation_unit_size = 16 * 1024
};
sdmmc_card_t *card;
const char mount_point[] = MOUNT_POINT;
ESP_LOGI(TAG, "Initializing SD card");
// Use settings defined above to initialize SD card and mount FAT filesystem.
// Note: esp_vfs_fat_sdmmc/sdspi_mount is all-in-one convenience functions.
// Please check its source code and implement error recovery when developing
// production applications.
ESP_LOGI(TAG, "Using SDMMC peripheral");
// By default, SD card frequency is initialized to SDMMC_FREQ_DEFAULT (20MHz)
// For setting a specific frequency, use host.max_freq_khz (range 400kHz - 40MHz for SDMMC)
// Example: for fixed frequency of 10MHz, use host.max_freq_khz = 10000;
sdmmc_host_t host = SDMMC_HOST_DEFAULT();
/**
* On these chips, the SDMMC IO power is supplied externally
*/
#if CONFIG_EXAMPLE_SDMMC_IO_POWER_INTERNAL_LDO
sd_pwr_ctrl_ldo_config_t ldo_config = {
.ldo_chan_id = 4, // `LDO_VO4` is used as the SDMMC IO power
};
sd_pwr_ctrl_handle_t pwr_ctrl_handle = NULL;
ret = sd_pwr_ctrl_new_on_chip_ldo(&ldo_config, &pwr_ctrl_handle);
if (ret != ESP_OK) {
ESP_LOGE(TAG, "Failed to new an on-chip ldo power control driver");
return;
}
host.pwr_ctrl_handle = pwr_ctrl_handle;
#endif
// This initializes the slot without card detect (CD) and write protect (WP) signals.
// Modify slot_config.gpio_cd and slot_config.gpio_wp if your board has these signals.
sdmmc_slot_config_t slot_config = SDMMC_SLOT_CONFIG_DEFAULT();
// Set bus width to use:
#ifdef CONFIG_EXAMPLE_SDMMC_BUS_WIDTH_4
slot_config.width = 4;
#else
slot_config.width = 1;
#endif
// On chips where the GPIOs used for SD card can be configured, set them in
// the slot_config structure:
#ifdef CONFIG_SOC_SDMMC_USE_GPIO_MATRIX
slot_config.clk = CONFIG_EXAMPLE_PIN_CLK;
slot_config.cmd = CONFIG_EXAMPLE_PIN_CMD;
slot_config.d0 = CONFIG_EXAMPLE_PIN_D0;
#ifdef CONFIG_EXAMPLE_SDMMC_BUS_WIDTH_4
slot_config.d1 = CONFIG_EXAMPLE_PIN_D1;
slot_config.d2 = CONFIG_EXAMPLE_PIN_D2;
slot_config.d3 = CONFIG_EXAMPLE_PIN_D3;
#endif // CONFIG_EXAMPLE_SDMMC_BUS_WIDTH_4
#endif // CONFIG_SOC_SDMMC_USE_GPIO_MATRIX
// Enable internal pullups on enabled pins. The internal pullups
// are insufficient however, please make sure 10k external pullups are
// connected on the bus. This is for debug / example purpose only.
slot_config.flags |= SDMMC_SLOT_FLAG_INTERNAL_PULLUP;
ESP_LOGI(TAG, "Mounting filesystem");
ret = esp_vfs_fat_sdmmc_mount(mount_point, &host, &slot_config, &mount_config, &card);
if (ret != ESP_OK) {
if (ret == ESP_FAIL) {
ESP_LOGE(TAG, "Failed to mount filesystem. "
"If you want the card to be formatted, set the EXAMPLE_FORMAT_IF_MOUNT_FAILED menuconfig option.");
} else {
ESP_LOGE(TAG, "Failed to initialize the card (%s). "
"Make sure SD card lines have pull-up resistors in place.", esp_err_to_name(ret));
#ifdef CONFIG_EXAMPLE_DEBUG_PIN_CONNECTIONS
check_sd_card_pins(&config, pin_count);
#endif
}
return;
}
ESP_LOGI(TAG, "Filesystem mounted");
// Card has been initialized, print its properties
sdmmc_card_print_info(stdout, card);
// Use POSIX and C standard library functions to work with files:
// First create a file.
const char *file_hello = MOUNT_POINT"/hello.txt";
char data[EXAMPLE_MAX_CHAR_SIZE];
snprintf(data, EXAMPLE_MAX_CHAR_SIZE, "%s %s!\n", "Hello", card->cid.name);
ret = s_example_write_file(file_hello, data);
if (ret != ESP_OK) {
return;
}
const char *file_foo = MOUNT_POINT"/foo.txt";
// Check if destination file exists before renaming
struct stat st;
if (stat(file_foo, &st) == 0) {
// Delete it if it exists
unlink(file_foo);
}
// Rename original file
ESP_LOGI(TAG, "Renaming file %s to %s", file_hello, file_foo);
if (rename(file_hello, file_foo) != 0) {
ESP_LOGE(TAG, "Rename failed");
return;
}
ret = s_example_read_file(file_foo);
if (ret != ESP_OK) {
return;
}
// Format FATFS
#ifdef CONFIG_EXAMPLE_FORMAT_SD_CARD
ret = esp_vfs_fat_sdcard_format(mount_point, card);
if (ret != ESP_OK) {
ESP_LOGE(TAG, "Failed to format FATFS (%s)", esp_err_to_name(ret));
return;
}
if (stat(file_foo, &st) == 0) {
ESP_LOGI(TAG, "file still exists");
return;
} else {
ESP_LOGI(TAG, "file doesnt exist, format done");
}
#endif // CONFIG_EXAMPLE_FORMAT_SD_CARD
const char *file_nihao = MOUNT_POINT"/nihao.txt";
memset(data, 0, EXAMPLE_MAX_CHAR_SIZE);
snprintf(data, EXAMPLE_MAX_CHAR_SIZE, "%s %s!\n", "Nihao", card->cid.name);
ret = s_example_write_file(file_nihao, data);
if (ret != ESP_OK) {
return;
}
//Open file for reading
ret = s_example_read_file(file_nihao);
if (ret != ESP_OK) {
return;
}
// All done, unmount partition and disable SDMMC peripheral
esp_vfs_fat_sdcard_unmount(mount_point, card);
#if SOC_SDMMC_IO_POWER_EXTERNAL
ret = sd_pwr_ctrl_del_on_chip_ldo(pwr_ctrl_handle);
if (ret != ESP_OK) {
ESP_LOGE(TAG, "Failed to delete on-chip ldo power control driver");
return;
}
#endif
ESP_LOGI(TAG, "Card unmounted");
}
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