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Code Issues Releases Wiki Activity

[preferences] Use static storage for singletons and flash buffer (#13727)

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This commit is contained in:
J. Nick Koston
2026-02-03 04:03:52 +01:00
committed by GitHub
parent ae71f07abb
commit 9f1a427ce2
6 changed files with 34 additions and 28 deletions
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7
esphome/components/esp32/preferences.cpp
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@@ -203,10 +203,11 @@ class ESP32Preferences : public ESPPreferences {
}
};
static ESP32Preferences s_preferences; // NOLINT(cppcoreguidelines-avoid-non-const-global-variables)
void setup_preferences() {
auto *prefs = new ESP32Preferences(); // NOLINT(cppcoreguidelines-owning-memory)
prefs->open();
global_preferences = prefs;
s_preferences.open();
global_preferences = &s_preferences;
}
} // namespace esp32

17
esphome/components/esp8266/preferences.cpp
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@@ -17,10 +17,6 @@ namespace esphome::esp8266 {
static const char *const TAG = "esp8266.preferences";
static uint32_t *s_flash_storage = nullptr; // NOLINT(cppcoreguidelines-avoid-non-const-global-variables)
static bool s_prevent_write = false; // NOLINT(cppcoreguidelines-avoid-non-const-global-variables)
static bool s_flash_dirty = false; // NOLINT(cppcoreguidelines-avoid-non-const-global-variables)
static constexpr uint32_t ESP_RTC_USER_MEM_START = 0x60001200;
static constexpr uint32_t ESP_RTC_USER_MEM_SIZE_WORDS = 128;
static constexpr uint32_t ESP_RTC_USER_MEM_SIZE_BYTES = ESP_RTC_USER_MEM_SIZE_WORDS * 4;
@@ -43,6 +39,11 @@ static constexpr uint32_t ESP8266_FLASH_STORAGE_SIZE = 128;
static constexpr uint32_t ESP8266_FLASH_STORAGE_SIZE = 64;
#endif
static uint32_t
s_flash_storage[ESP8266_FLASH_STORAGE_SIZE]; // NOLINT(cppcoreguidelines-avoid-non-const-global-variables)
static bool s_prevent_write = false; // NOLINT(cppcoreguidelines-avoid-non-const-global-variables)
static bool s_flash_dirty = false; // NOLINT(cppcoreguidelines-avoid-non-const-global-variables)
static inline bool esp_rtc_user_mem_read(uint32_t index, uint32_t *dest) {
if (index >= ESP_RTC_USER_MEM_SIZE_WORDS) {
return false;
@@ -180,7 +181,6 @@ class ESP8266Preferences : public ESPPreferences {
uint32_t current_flash_offset = 0; // in words
void setup() {
s_flash_storage = new uint32_t[ESP8266_FLASH_STORAGE_SIZE]; // NOLINT
ESP_LOGVV(TAG, "Loading preferences from flash");
{
@@ -283,10 +283,11 @@ class ESP8266Preferences : public ESPPreferences {
}
};
static ESP8266Preferences s_preferences; // NOLINT(cppcoreguidelines-avoid-non-const-global-variables)
void setup_preferences() {
auto *pref = new ESP8266Preferences(); // NOLINT(cppcoreguidelines-owning-memory)
pref->setup();
global_preferences = pref;
s_preferences.setup();
global_preferences = &s_preferences;
}
void preferences_prevent_write(bool prevent) { s_prevent_write = prevent; }

7
esphome/components/host/preferences.cpp
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@@ -66,10 +66,11 @@ ESPPreferenceObject HostPreferences::make_preference(size_t length, uint32_t typ
return ESPPreferenceObject(backend);
};
static HostPreferences s_preferences; // NOLINT(cppcoreguidelines-avoid-non-const-global-variables)
void setup_preferences() {
auto *pref = new HostPreferences(); // NOLINT(cppcoreguidelines-owning-memory)
host_preferences = pref;
global_preferences = pref;
host_preferences = &s_preferences;
global_preferences = &s_preferences;
}
bool HostPreferenceBackend::save(const uint8_t *data, size_t len) {

7
esphome/components/libretiny/preferences.cpp
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@@ -189,10 +189,11 @@ class LibreTinyPreferences : public ESPPreferences {
}
};
static LibreTinyPreferences s_preferences; // NOLINT(cppcoreguidelines-avoid-non-const-global-variables)
void setup_preferences() {
auto *prefs = new LibreTinyPreferences(); // NOLINT(cppcoreguidelines-owning-memory)
prefs->open();
global_preferences = prefs;
s_preferences.open();
global_preferences = &s_preferences;
}
} // namespace libretiny

17
esphome/components/rp2040/preferences.cpp
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@@ -18,11 +18,12 @@ namespace rp2040 {
static const char *const TAG = "rp2040.preferences";
static bool s_prevent_write = false; // NOLINT(cppcoreguidelines-avoid-non-const-global-variables)
static uint8_t *s_flash_storage = nullptr; // NOLINT(cppcoreguidelines-avoid-non-const-global-variables)
static bool s_flash_dirty = false; // NOLINT(cppcoreguidelines-avoid-non-const-global-variables)
static constexpr uint32_t RP2040_FLASH_STORAGE_SIZE = 512;
static const uint32_t RP2040_FLASH_STORAGE_SIZE = 512;
static bool s_prevent_write = false; // NOLINT(cppcoreguidelines-avoid-non-const-global-variables)
static uint8_t
s_flash_storage[RP2040_FLASH_STORAGE_SIZE]; // NOLINT(cppcoreguidelines-avoid-non-const-global-variables)
static bool s_flash_dirty = false; // NOLINT(cppcoreguidelines-avoid-non-const-global-variables)
// Stack buffer size for preferences - covers virtually all real-world preferences without heap allocation
static constexpr size_t PREF_BUFFER_SIZE = 64;
@@ -91,7 +92,6 @@ class RP2040Preferences : public ESPPreferences {
RP2040Preferences() : eeprom_sector_(&_EEPROM_start) {}
void setup() {
s_flash_storage = new uint8_t[RP2040_FLASH_STORAGE_SIZE]; // NOLINT
ESP_LOGVV(TAG, "Loading preferences from flash");
memcpy(s_flash_storage, this->eeprom_sector_, RP2040_FLASH_STORAGE_SIZE);
}
@@ -149,10 +149,11 @@ class RP2040Preferences : public ESPPreferences {
uint8_t *eeprom_sector_;
};
static RP2040Preferences s_preferences; // NOLINT(cppcoreguidelines-avoid-non-const-global-variables)
void setup_preferences() {
auto *prefs = new RP2040Preferences(); // NOLINT(cppcoreguidelines-owning-memory)
prefs->setup();
global_preferences = prefs;
s_preferences.setup();
global_preferences = &s_preferences;
}
void preferences_prevent_write(bool prevent) { s_prevent_write = prevent; }

7
esphome/components/zephyr/preferences.cpp
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@@ -152,10 +152,11 @@ class ZephyrPreferences : public ESPPreferences {
}
};
static ZephyrPreferences s_preferences; // NOLINT(cppcoreguidelines-avoid-non-const-global-variables)
void setup_preferences() {
auto *prefs = new ZephyrPreferences(); // NOLINT(cppcoreguidelines-owning-memory)
global_preferences = prefs;
prefs->open();
global_preferences = &s_preferences;
s_preferences.open();
}
} // namespace zephyr