mirror of https://github.com/esphome/esphome.git
273 lines
7.7 KiB
C++
273 lines
7.7 KiB
C++
#ifdef USE_ESP8266
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#include <c_types.h>
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extern "C" {
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#include "spi_flash.h"
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}
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#include "preferences.h"
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#include <cstring>
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#include "esphome/core/preferences.h"
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#include "esphome/core/helpers.h"
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#include "esphome/core/log.h"
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#include "esphome/core/defines.h"
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namespace esphome {
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namespace esp8266 {
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static const char *const TAG = "esp8266.preferences";
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static bool s_prevent_write = false; // NOLINT(cppcoreguidelines-avoid-non-const-global-variables)
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static uint32_t *s_flash_storage = nullptr; // NOLINT(cppcoreguidelines-avoid-non-const-global-variables)
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static bool s_flash_dirty = false; // NOLINT(cppcoreguidelines-avoid-non-const-global-variables)
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static const uint32_t ESP_RTC_USER_MEM_START = 0x60001200;
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#define ESP_RTC_USER_MEM ((uint32_t *) ESP_RTC_USER_MEM_START)
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static const uint32_t ESP_RTC_USER_MEM_SIZE_WORDS = 128;
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static const uint32_t ESP_RTC_USER_MEM_SIZE_BYTES = ESP_RTC_USER_MEM_SIZE_WORDS * 4;
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#ifdef USE_ESP8266_PREFERENCES_FLASH
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static const uint32_t ESP8266_FLASH_STORAGE_SIZE = 128;
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#else
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static const uint32_t ESP8266_FLASH_STORAGE_SIZE = 64;
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#endif
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static inline bool esp_rtc_user_mem_read(uint32_t index, uint32_t *dest) {
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if (index >= ESP_RTC_USER_MEM_SIZE_WORDS) {
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return false;
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}
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*dest = ESP_RTC_USER_MEM[index]; // NOLINT(performance-no-int-to-ptr)
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return true;
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}
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static inline bool esp_rtc_user_mem_write(uint32_t index, uint32_t value) {
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if (index >= ESP_RTC_USER_MEM_SIZE_WORDS) {
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return false;
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}
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if (index < 32 && s_prevent_write) {
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return false;
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}
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auto *ptr = &ESP_RTC_USER_MEM[index]; // NOLINT(performance-no-int-to-ptr)
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*ptr = value;
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return true;
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}
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extern "C" uint32_t _SPIFFS_end; // NOLINT
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static uint32_t get_esp8266_flash_sector() {
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union {
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uint32_t *ptr;
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uint32_t uint;
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} data{};
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data.ptr = &_SPIFFS_end;
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return (data.uint - 0x40200000) / SPI_FLASH_SEC_SIZE;
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}
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static uint32_t get_esp8266_flash_address() { return get_esp8266_flash_sector() * SPI_FLASH_SEC_SIZE; }
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template<class It> uint32_t calculate_crc(It first, It last, uint32_t type) {
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uint32_t crc = type;
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while (first != last) {
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crc ^= (*first++ * 2654435769UL) >> 1;
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}
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return crc;
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}
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static bool save_to_flash(size_t offset, const uint32_t *data, size_t len) {
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for (uint32_t i = 0; i < len; i++) {
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uint32_t j = offset + i;
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if (j >= ESP8266_FLASH_STORAGE_SIZE)
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return false;
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uint32_t v = data[i];
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uint32_t *ptr = &s_flash_storage[j];
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if (*ptr != v)
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s_flash_dirty = true;
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*ptr = v;
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}
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return true;
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}
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static bool load_from_flash(size_t offset, uint32_t *data, size_t len) {
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for (size_t i = 0; i < len; i++) {
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uint32_t j = offset + i;
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if (j >= ESP8266_FLASH_STORAGE_SIZE)
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return false;
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data[i] = s_flash_storage[j];
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}
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return true;
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}
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static bool save_to_rtc(size_t offset, const uint32_t *data, size_t len) {
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for (uint32_t i = 0; i < len; i++) {
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if (!esp_rtc_user_mem_write(offset + i, data[i]))
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return false;
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}
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return true;
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}
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static bool load_from_rtc(size_t offset, uint32_t *data, size_t len) {
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for (uint32_t i = 0; i < len; i++) {
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if (!esp_rtc_user_mem_read(offset + i, &data[i]))
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return false;
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}
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return true;
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}
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class ESP8266PreferenceBackend : public ESPPreferenceBackend {
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public:
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size_t offset = 0;
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uint32_t type = 0;
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bool in_flash = false;
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size_t length_words = 0;
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bool save(const uint8_t *data, size_t len) override {
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if ((len + 3) / 4 != length_words) {
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return false;
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}
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std::vector<uint32_t> buffer;
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buffer.resize(length_words + 1);
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memcpy(buffer.data(), data, len);
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buffer[buffer.size() - 1] = calculate_crc(buffer.begin(), buffer.end() - 1, type);
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if (in_flash) {
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return save_to_flash(offset, buffer.data(), buffer.size());
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} else {
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return save_to_rtc(offset, buffer.data(), buffer.size());
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}
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}
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bool load(uint8_t *data, size_t len) override {
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if ((len + 3) / 4 != length_words) {
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return false;
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}
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std::vector<uint32_t> buffer;
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buffer.resize(length_words + 1);
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bool ret;
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if (in_flash) {
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ret = load_from_flash(offset, buffer.data(), buffer.size());
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} else {
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ret = load_from_rtc(offset, buffer.data(), buffer.size());
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}
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if (!ret)
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return false;
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uint32_t crc = calculate_crc(buffer.begin(), buffer.end() - 1, type);
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if (buffer[buffer.size() - 1] != crc) {
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return false;
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}
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memcpy(data, buffer.data(), len);
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return true;
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}
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};
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class ESP8266Preferences : public ESPPreferences {
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public:
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uint32_t current_offset = 0;
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uint32_t current_flash_offset = 0; // in words
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void setup() {
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s_flash_storage = new uint32_t[ESP8266_FLASH_STORAGE_SIZE]; // NOLINT
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ESP_LOGVV(TAG, "Loading preferences from flash...");
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{
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InterruptLock lock;
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spi_flash_read(get_esp8266_flash_address(), s_flash_storage, ESP8266_FLASH_STORAGE_SIZE * 4);
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}
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}
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ESPPreferenceObject make_preference(size_t length, uint32_t type, bool in_flash) override {
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uint32_t length_words = (length + 3) / 4;
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if (in_flash) {
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uint32_t start = current_flash_offset;
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uint32_t end = start + length_words + 1;
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if (end > ESP8266_FLASH_STORAGE_SIZE)
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return {};
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auto *pref = new ESP8266PreferenceBackend(); // NOLINT(cppcoreguidelines-owning-memory)
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pref->offset = start;
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pref->type = type;
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pref->length_words = length_words;
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pref->in_flash = true;
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current_flash_offset = end;
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return {pref};
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}
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uint32_t start = current_offset;
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uint32_t end = start + length_words + 1;
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bool in_normal = start < 96;
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// Normal: offset 0-95 maps to RTC offset 32 - 127,
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// Eboot: offset 96-127 maps to RTC offset 0 - 31 words
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if (in_normal && end > 96) {
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// start is in normal but end is not -> switch to Eboot
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current_offset = start = 96;
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end = start + length_words + 1;
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in_normal = false;
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}
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if (end > 128) {
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// Doesn't fit in data, return uninitialized preference obj.
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return {};
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}
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uint32_t rtc_offset = in_normal ? start + 32 : start - 96;
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auto *pref = new ESP8266PreferenceBackend(); // NOLINT(cppcoreguidelines-owning-memory)
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pref->offset = rtc_offset;
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pref->type = type;
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pref->length_words = length_words;
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pref->in_flash = false;
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current_offset += length_words + 1;
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return pref;
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}
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ESPPreferenceObject make_preference(size_t length, uint32_t type) override {
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#ifdef USE_ESP8266_PREFERENCES_FLASH
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return make_preference(length, type, true);
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#else
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return make_preference(length, type, false);
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#endif
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}
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bool sync() override {
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if (!s_flash_dirty)
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return true;
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if (s_prevent_write)
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return false;
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ESP_LOGD(TAG, "Saving preferences to flash...");
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SpiFlashOpResult erase_res, write_res = SPI_FLASH_RESULT_OK;
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{
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InterruptLock lock;
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erase_res = spi_flash_erase_sector(get_esp8266_flash_sector());
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if (erase_res == SPI_FLASH_RESULT_OK) {
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write_res = spi_flash_write(get_esp8266_flash_address(), s_flash_storage, ESP8266_FLASH_STORAGE_SIZE * 4);
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}
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}
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if (erase_res != SPI_FLASH_RESULT_OK) {
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ESP_LOGV(TAG, "Erase ESP8266 flash failed!");
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return false;
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}
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if (write_res != SPI_FLASH_RESULT_OK) {
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ESP_LOGV(TAG, "Write ESP8266 flash failed!");
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return false;
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}
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s_flash_dirty = false;
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return true;
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}
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};
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void setup_preferences() {
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auto *pref = new ESP8266Preferences(); // NOLINT(cppcoreguidelines-owning-memory)
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pref->setup();
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global_preferences = pref;
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}
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void preferences_prevent_write(bool prevent) { s_prevent_write = prevent; }
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} // namespace esp8266
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ESPPreferences *global_preferences; // NOLINT(cppcoreguidelines-avoid-non-const-global-variables)
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} // namespace esphome
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#endif // USE_ESP8266
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