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feat: triple power-cycle factory reset (no FTDI needed)

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Power-cycle the device 3 times within 10 seconds to trigger factory reset:
- Clears WiFi credentials (SSID + password) in EEPROM
- Shows "FACTORY RESET / WiFi: TJ56654-Setup / Pass: 12345678" on display
- Reboots into WiFiManager AP mode for reconfiguration

Counter stored at EEPROM offset 480 (well past Config ~260 bytes).
Clears automatically after 10s of stable operation.

Prevents the need for FTDI/USB recovery when credentials are corrupted.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Alex Petrochenko
2026-05-18 20:25:32 +01:00
co-authored by Claude Sonnet 4.6
parent e9dc158a4e
commit 5b8a58715e
2 changed files with 85 additions and 0 deletions
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firmware/weather_clock/weather_clock.ino
+73
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@@ -110,6 +110,64 @@ void ICACHE_FLASH_ATTR safeStringCopy(const String& src, char* dest, size_t maxL
dest[maxLen - 1] = '\0';
}
// ============ Triple power-cycle factory reset ============
//
// How it works: on each boot we increment a counter in EEPROM.
// If the device runs for >10s the counter is cleared back to 0.
// 3 quick power cycles before the 10s window = factory reset:
// clears WiFi credentials, reboots into WiFiManager AP mode.
void ICACHE_FLASH_ATTR checkFactoryReset() {
EEPROM.begin(512);
ResetCounter rc;
EEPROM.get(RESET_COUNTER_ADDR, rc);
if (rc.magic != RESET_COUNTER_MAGIC) {
rc.magic = RESET_COUNTER_MAGIC;
rc.count = 0;
}
rc.count++;
Serial.printf("Boot counter: %d/%d (power-cycle %d more times within 10s to factory reset)\n",
rc.count, RESET_COUNTER_TRIPS, RESET_COUNTER_TRIPS - rc.count);
if (rc.count >= RESET_COUNTER_TRIPS) {
Serial.println("!!! FACTORY RESET triggered !!!");
rc.count = 0;
EEPROM.put(RESET_COUNTER_ADDR, rc);
EEPROM.commit();
EEPROM.end();
// Clear WiFi credentials only — keep other settings
memset(config.ssid, 0, sizeof(config.ssid));
memset(config.password, 0, sizeof(config.password));
saveConfig();
// Show reset screen
display.clearDisplay();
display.setTextColor(SSD1306_WHITE);
display.setTextSize(2);
display.setCursor(8, 4);
display.println("FACTORY");
display.setCursor(8, 24);
display.println("RESET!");
display.setTextSize(1);
display.setCursor(2, 48);
display.println("WiFi: TJ56654-Setup");
display.setCursor(2, 57);
display.println("Pass: 12345678");
display.display();
delay(4000);
ESP.restart();
return;
}
EEPROM.put(RESET_COUNTER_ADDR, rc);
EEPROM.commit();
EEPROM.end();
}
// ============ EEPROM functions ============
void ICACHE_FLASH_ATTR loadConfig() {
@@ -219,6 +277,9 @@ void setup() {
// Load configuration
loadConfig();
// Check for triple power-cycle factory reset (must be after display+config init)
checkFactoryReset();
// Setup WiFi
setupWiFi();
@@ -325,6 +386,18 @@ void loop() {
fetchWeatherAsync();
}
// Clear factory-reset boot counter after 10s of normal operation
static bool resetCounterCleared = false;
if (!resetCounterCleared && millis() > RESET_COUNTER_WINDOW) {
EEPROM.begin(512);
ResetCounter rc = { RESET_COUNTER_MAGIC, 0 };
EEPROM.put(RESET_COUNTER_ADDR, rc);
EEPROM.commit();
EEPROM.end();
resetCounterCleared = true;
Serial.println("Boot counter cleared — stable operation confirmed");
}
// Update weather periodically (static flag avoids millis() > 10000 rollover trap)
static bool weatherBootReady = false;
if (!weatherBootReady && millis() > 10000UL) weatherBootReady = true;