circuitpython/ports/esp32/esp32_nvs.c

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2021 by Thorsten von Eicken
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <string.h>
#include "py/runtime.h"
#include "py/mperrno.h"
#include "mphalport.h"
#include "modesp32.h"
#include "nvs_flash.h"
#include "nvs.h"
// This file implements the NVS (Non-Volatile Storage) class in the esp32 module.
// It provides simple access to the NVS feature provided by ESP-IDF.
// NVS python object that represents an NVS namespace.
typedef struct _esp32_nvs_obj_t {
mp_obj_base_t base;
nvs_handle_t namespace;
} esp32_nvs_obj_t;
// *esp32_nvs_new allocates a python NVS object given a handle to an esp-idf namespace C obj.
STATIC esp32_nvs_obj_t *esp32_nvs_new(nvs_handle_t namespace) {
esp32_nvs_obj_t *self = mp_obj_malloc(esp32_nvs_obj_t, &esp32_nvs_type);
self->namespace = namespace;
return self;
}
// esp32_nvs_print prints an NVS object, unfortunately it doesn't seem possible to extract the
// namespace string or anything else from the opaque handle provided by esp-idf.
STATIC void esp32_nvs_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
// esp32_nvs_obj_t *self = MP_OBJ_TO_PTR(self_in);
mp_printf(print, "<NVS namespace>");
}
// esp32_nvs_make_new constructs a handle to an NVS namespace.
STATIC mp_obj_t esp32_nvs_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *all_args) {
// Check args
mp_arg_check_num(n_args, n_kw, 1, 1, false);
// Get requested nvs namespace
const char *ns_name = mp_obj_str_get_str(all_args[0]);
nvs_handle_t namespace;
check_esp_err(nvs_open(ns_name, NVS_READWRITE, &namespace));
return MP_OBJ_FROM_PTR(esp32_nvs_new(namespace));
}
// esp32_nvs_set_i32 sets a 32-bit integer value
STATIC mp_obj_t esp32_nvs_set_i32(mp_obj_t self_in, mp_obj_t key_in, mp_obj_t value_in) {
esp32_nvs_obj_t *self = MP_OBJ_TO_PTR(self_in);
const char *key = mp_obj_str_get_str(key_in);
int32_t value = mp_obj_get_int(value_in);
check_esp_err(nvs_set_i32(self->namespace, key, value));
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_3(esp32_nvs_set_i32_obj, esp32_nvs_set_i32);
// esp32_nvs_get_i32 reads a 32-bit integer value
STATIC mp_obj_t esp32_nvs_get_i32(mp_obj_t self_in, mp_obj_t key_in) {
esp32_nvs_obj_t *self = MP_OBJ_TO_PTR(self_in);
const char *key = mp_obj_str_get_str(key_in);
int32_t value;
check_esp_err(nvs_get_i32(self->namespace, key, &value));
return mp_obj_new_int(value);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_2(esp32_nvs_get_i32_obj, esp32_nvs_get_i32);
// esp32_nvs_set_blob writes a buffer object into a binary blob value.
STATIC mp_obj_t esp32_nvs_set_blob(mp_obj_t self_in, mp_obj_t key_in, mp_obj_t value_in) {
esp32_nvs_obj_t *self = MP_OBJ_TO_PTR(self_in);
const char *key = mp_obj_str_get_str(key_in);
mp_buffer_info_t value;
mp_get_buffer_raise(value_in, &value, MP_BUFFER_READ);
check_esp_err(nvs_set_blob(self->namespace, key, value.buf, value.len));
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_3(esp32_nvs_set_blob_obj, esp32_nvs_set_blob);
// esp32_nvs_get_blob reads a binary blob value into a bytearray. Returns actual length.
STATIC mp_obj_t esp32_nvs_get_blob(mp_obj_t self_in, mp_obj_t key_in, mp_obj_t value_in) {
esp32_nvs_obj_t *self = MP_OBJ_TO_PTR(self_in);
const char *key = mp_obj_str_get_str(key_in);
// get buffer to be filled
mp_buffer_info_t value;
mp_get_buffer_raise(value_in, &value, MP_BUFFER_WRITE);
size_t length = value.len;
// fill the buffer with the value, will raise an esp-idf error if the length of
// the provided buffer (bytearray) is too small
check_esp_err(nvs_get_blob(self->namespace, key, value.buf, &length));
return MP_OBJ_NEW_SMALL_INT(length);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_3(esp32_nvs_get_blob_obj, esp32_nvs_get_blob);
// esp32_nvs_erase_key erases one key.
STATIC mp_obj_t esp32_nvs_erase_key(mp_obj_t self_in, mp_obj_t key_in) {
esp32_nvs_obj_t *self = MP_OBJ_TO_PTR(self_in);
const char *key = mp_obj_str_get_str(key_in);
check_esp_err(nvs_erase_key(self->namespace, key));
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_2(esp32_nvs_erase_key_obj, esp32_nvs_erase_key);
// esp32_nvs_commit commits any changes to flash.
STATIC mp_obj_t esp32_nvs_commit(mp_obj_t self_in) {
esp32_nvs_obj_t *self = MP_OBJ_TO_PTR(self_in);
check_esp_err(nvs_commit(self->namespace));
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(esp32_nvs_commit_obj, esp32_nvs_commit);
STATIC const mp_rom_map_elem_t esp32_nvs_locals_dict_table[] = {
{ MP_ROM_QSTR(MP_QSTR_get_i32), MP_ROM_PTR(&esp32_nvs_get_i32_obj) },
{ MP_ROM_QSTR(MP_QSTR_set_i32), MP_ROM_PTR(&esp32_nvs_set_i32_obj) },
{ MP_ROM_QSTR(MP_QSTR_get_blob), MP_ROM_PTR(&esp32_nvs_get_blob_obj) },
{ MP_ROM_QSTR(MP_QSTR_set_blob), MP_ROM_PTR(&esp32_nvs_set_blob_obj) },
{ MP_ROM_QSTR(MP_QSTR_erase_key), MP_ROM_PTR(&esp32_nvs_erase_key_obj) },
{ MP_ROM_QSTR(MP_QSTR_commit), MP_ROM_PTR(&esp32_nvs_commit_obj) },
};
STATIC MP_DEFINE_CONST_DICT(esp32_nvs_locals_dict, esp32_nvs_locals_dict_table);
MP_DEFINE_CONST_OBJ_TYPE(
esp32_nvs_type,
MP_QSTR_NVS,
MP_TYPE_FLAG_NONE,
esp32_nvs_make_new,
print, esp32_nvs_print,
locals_dict, &esp32_nvs_locals_dict
);