esp-idf/examples/storage/partition_api/partition_ops/main/main.c

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/* Finding Partitions 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.
*/
#include <string.h>
#include <assert.h>
#include "esp_partition.h"
#include "spi_flash_mmap.h"
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#include "esp_log.h"
static const char *TAG = "example";
void app_main(void)
{
/*
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* This example uses the partition table from ../partitions_example.csv. For reference, its contents are as follows:
*
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* nvs, data, nvs, 0x9000, 0x6000,
* phy_init, data, phy, 0xf000, 0x1000,
* factory, app, factory, 0x10000, 1M,
* storage, data, , , 0x40000,
*/
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// Find the partition map in the partition table
const esp_partition_t *partition = esp_partition_find_first(ESP_PARTITION_TYPE_DATA, ESP_PARTITION_SUBTYPE_ANY, "storage");
assert(partition != NULL);
static char store_data[] = "ESP-IDF Partition Operations Example (Read, Erase, Write)";
static char read_data[sizeof(store_data)];
// Erase entire partition
memset(read_data, 0xFF, sizeof(read_data));
ESP_ERROR_CHECK(esp_partition_erase_range(partition, 0, partition->size));
// Write the data, starting from the beginning of the partition
ESP_ERROR_CHECK(esp_partition_write(partition, 0, store_data, sizeof(store_data)));
ESP_LOGI(TAG, "Written data: %s", store_data);
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// Read back the data, checking that read data and written data match
ESP_ERROR_CHECK(esp_partition_read(partition, 0, read_data, sizeof(read_data)));
assert(memcmp(store_data, read_data, sizeof(read_data)) == 0);
ESP_LOGI(TAG, "Read data: %s", read_data);
// Erase the area where the data was written. Erase size shoud be a multiple of SPI_FLASH_SEC_SIZE
// and also be SPI_FLASH_SEC_SIZE aligned
ESP_ERROR_CHECK(esp_partition_erase_range(partition, 0, SPI_FLASH_SEC_SIZE));
// Read back the data (should all now be 0xFF's)
memset(store_data, 0xFF, sizeof(read_data));
ESP_ERROR_CHECK(esp_partition_read(partition, 0, read_data, sizeof(read_data)));
assert(memcmp(store_data, read_data, sizeof(read_data)) == 0);
ESP_LOGI(TAG, "Erased data");
ESP_LOGI(TAG, "Example end");
}