ESP32F030 FLASH 模拟eeprom代码

对于ESP32F030，可以使用内部闪存来实现类似EEPROM的功能。以下是使用ESP-IDF的示例代码：

#include "esp_system.h"
#include "nvs_flash.h"
#include "nvs.h"

#define EEPROM_NAMESPACE "eeprom"

void eeprom_init()
{
    esp_err_t err = nvs_flash_init();
    if (err == ESP_ERR_NVS_NO_FREE_PAGES || err == ESP_ERR_NVS_NEW_VERSION_FOUND) {
        ESP_ERROR_CHECK(nvs_flash_erase());
        err = nvs_flash_init();
    }
    ESP_ERROR_CHECK(err);
}

void eeprom_write(uint16_t address, uint8_t data)
{
    nvs_handle_t handle;
    ESP_ERROR_CHECK(nvs_open(EEPROM_NAMESPACE, NVS_READWRITE, &handle));
    ESP_ERROR_CHECK(nvs_set_u8(handle, address, data));
    ESP_ERROR_CHECK(nvs_commit(handle));
    nvs_close(handle);
}

uint8_t eeprom_read(uint16_t address)
{
    uint8_t data;
    nvs_handle_t handle;
    ESP_ERROR_CHECK(nvs_open(EEPROM_NAMESPACE, NVS_READONLY, &handle));
    ESP_ERROR_CHECK(nvs_get_u8(handle, address, &data));
    nvs_close(handle);
    return data;
}

void eeprom_erase_all()
{
    nvs_flash_erase();
}

void eeprom_erase(uint16_t address)
{
    nvs_handle_t handle;
    ESP_ERROR_CHECK(nvs_open(EEPROM_NAMESPACE, NVS_READWRITE, &handle));
    ESP_ERROR_CHECK(nvs_erase_key(handle, address));
    ESP_ERROR_CHECK(nvs_commit(handle));
    nvs_close(handle);
}

在初始化时，需要调用eeprom_init()函数。写入和读取数据的函数分别是eeprom_write()和eeprom_read()。擦除单个地址的函数是eeprom_erase()，擦除所有数据的函数是eeprom_erase_all()。

使用示例：

#include "eeprom.h"

void app_main()
{
    eeprom_init();

    //写入数据
    eeprom_write(0, 0x11);
    eeprom_write(1, 0x22);
    eeprom_write(2, 0x33);

    //读取数据
    uint8_t data = eeprom_read(1);

    //擦除单个地址
    eeprom_erase(1);

    //擦除所有数据
    eeprom_erase_all();
}