system: rework stability counter

- remove public function from the header
- initial log for both states, log counted number
- fixup terminal reset triggering unstable state

code/espurna/system.cpp

@@ -164,43 +164,45 @@ void _systemRtcmemResetReason(CustomResetReason reason) {
 //
 // An unstable system will only have serial access, WiFi in AP mode and OTA
 
-bool _systemStable = true;
-
-void systemCheck(bool stable) {
-    uint8_t value = 0;
-
-    if (stable) {
-        value = 0;
-        DEBUG_MSG_P(PSTR("[MAIN] System OK\n"));
-    } else {
-        if (!rtcmemStatus()) {
-            systemStabilityCounter(1);
-            return;
-        }
-
-        value = systemStabilityCounter();
+constexpr unsigned char _systemCheckMin() {
+    return 0u;
+}
 
-        if (++value > SYSTEM_CHECK_MAX) {
-            _systemStable = false;
-            value = SYSTEM_CHECK_MAX;
-            DEBUG_MSG_P(PSTR("[MAIN] System UNSTABLE\n"));
-        }
-    }
+constexpr unsigned char _systemCheckMax() {
+    return SYSTEM_CHECK_MAX;
+}
 
-    systemStabilityCounter(value);
+constexpr unsigned long _systemCheckTime() {
+    return SYSTEM_CHECK_TIME;
 }
 
-bool systemCheck() {
-    return _systemStable;
+static_assert(_systemCheckMax() > 0, "");
+
+Ticker _system_stable_timer;
+bool _system_stable { true };
+
+void _systemStabilityInit() {
+    auto count = rtcmemStatus() ? systemStabilityCounter() : 1u;
+
+    _system_stable = (count < _systemCheckMax());
+    DEBUG_MSG_P(PSTR("[MAIN] System %s\n"), _system_stable ? "OK" : "UNSTABLE");
+
+    _system_stable_timer.once_ms_scheduled(_systemCheckTime(), []() {
+        DEBUG_MSG_P(PSTR("[MAIN] System stability counter %hhu / %hhu\n"),
+                _systemCheckMin(), _systemCheckMax());
+        systemStabilityCounter(_systemCheckMin());
+    });
+
+    auto next = count + 1u;
+    count = next > _systemCheckMax()
+        ? count
+        : next;
+
+    systemStabilityCounter(count);
 }
 
-void _systemCheckLoop() {
-    static bool checked = false;
-    if (!checked && (millis() > SYSTEM_CHECK_TIME)) {
-        // Flag system as stable
-        systemCheck(true);
-        checked = true;
-    }
+bool systemCheck() {
+    return _system_stable;
 }
 
 #endif
@@ -536,10 +538,6 @@ void systemLoop() {
         return;
     }
 
-#if SYSTEM_CHECK_ENABLED
-    _systemCheckLoop();
-#endif
-
     _systemUpdateLoadAverage();
 }
 
@@ -573,9 +571,8 @@ void systemSetup() {
         SPIFFS.begin();
     #endif
 
-    // Question system stability
     #if SYSTEM_CHECK_ENABLED
-        systemCheck(false);
+        _systemStabilityInit();
     #endif
 
     #if WEB_SUPPORT

code/espurna/system.h

@@ -146,7 +146,6 @@ uint32_t systemResetReason();
 uint8_t systemStabilityCounter();
 void systemStabilityCounter(uint8_t count);
 
-void systemCheck(bool stable);
 bool systemCheck();
 
 void customResetReason(CustomResetReason reason);

code/espurna/terminal.cpp

@@ -348,10 +348,11 @@ void _terminalInitCommands() {
     });
 
     terminalRegisterCommand(F("RESET"), [](const terminal::CommandContext& ctx) {
+        auto count = 1;
         if (ctx.argc == 2) {
-            auto arg = ctx.argv[1].toInt();
+            count = ctx.argv[1].toInt();
             if (arg < SYSTEM_CHECK_MAX) {
-                systemStabilityCounter(arg);
+                systemStabilityCounter(count);
             }
         }