diff --git a/firmware/console/status_loop.cpp b/firmware/console/status_loop.cpp
index 110de37fe4..571fa79d52 100644
--- a/firmware/console/status_loop.cpp
+++ b/firmware/console/status_loop.cpp
@@ -412,8 +412,9 @@ static THD_WORKING_AREA(lcdThreadStack, UTILITY_THREAD_STACK_SIZE);
 
 /**
  * blinking thread to show that we are alive
+ * that's a trivial task - a smaller stack should work
  */
-static THD_WORKING_AREA(comBlinkingStack, UTILITY_THREAD_STACK_SIZE);
+static THD_WORKING_AREA(blinkingStack, 128);
 
 static OutputPin communicationPin;
 OutputPin checkEnginePin;
@@ -446,13 +447,8 @@ static void initialLedsBlink(void) {
 		leds[i]->setValue(0);
 }
 
-/**
- * error thread to show error condition (blinking LED means non-fatal error)
- */
-static THD_WORKING_AREA(errBlinkingStack, UTILITY_THREAD_STACK_SIZE);
-
 #if EFI_PROD_CODE || defined(__DOXYGEN__)
-static void comBlinkingThread(void *arg) {
+static void blinkingThread(void *arg) {
 	(void) arg;
 	chRegSetThreadName("communication blinking");
 
@@ -468,27 +464,19 @@ static void comBlinkingThread(void *arg) {
 		}
 
 		communicationPin.setValue(0);
+		warningPin.setValue(0);
 		chThdSleepMilliseconds(delay);
 
 		communicationPin.setValue(1);
+#if EFI_ENGINE_CONTROL || defined(__DOXYGEN__)
+		if (isTriggerDecoderError() || isIgnitionTimingError())
+			warningPin.setValue(1);
+#endif
 		chThdSleepMilliseconds(delay);
+
 	}
 }
 
-static void errBlinkingThread(void *arg) {
-	(void) arg;
-	chRegSetThreadName("err blinking");
-#if EFI_ENGINE_CONTROL || defined(__DOXYGEN__)
-	while (TRUE) {
-		int delay = 33;
-		if (isTriggerDecoderError() || isIgnitionTimingError())
-			warningPin.setValue(1);
-		chThdSleepMilliseconds(delay);
-		warningPin.setValue(0);
-		chThdSleepMilliseconds(delay);
-	}
-#endif /* EFI_ENGINE_CONTROL */
-}
 #endif /* EFI_PROD_CODE */
 
 static void lcdThread(Engine *engine) {
@@ -630,8 +618,7 @@ void startStatusThreads(Engine *engine) {
 	chThdCreateStatic(lcdThreadStack, sizeof(lcdThreadStack), NORMALPRIO, (tfunc_t) lcdThread, engine);
 	chThdCreateStatic(tsThreadStack, sizeof(tsThreadStack), NORMALPRIO, (tfunc_t) tsStatusThread, engine);
 #if EFI_PROD_CODE || defined(__DOXYGEN__)
-	chThdCreateStatic(comBlinkingStack, sizeof(comBlinkingStack), NORMALPRIO, (tfunc_t) comBlinkingThread, NULL);
-	chThdCreateStatic(errBlinkingStack, sizeof(errBlinkingStack), NORMALPRIO, (tfunc_t) errBlinkingThread, NULL);
+	chThdCreateStatic(blinkingStack, sizeof(blinkingStack), NORMALPRIO, (tfunc_t) blinkingThread, NULL);
 #endif /* EFI_PROD_CODE */
 }
 
diff --git a/firmware/controllers/core/EfiWave.cpp b/firmware/controllers/core/EfiWave.cpp
index 1c15012acb..a4d6e3f571 100644
--- a/firmware/controllers/core/EfiWave.cpp
+++ b/firmware/controllers/core/EfiWave.cpp
@@ -13,11 +13,11 @@ single_wave_s::single_wave_s() {
 	init(NULL);
 }
 
-single_wave_s::single_wave_s(int *ps) {
+single_wave_s::single_wave_s(pin_state_t *ps) {
 	init(ps);
 }
 
-void single_wave_s::init(int *pinStates) {
+void single_wave_s::init(pin_state_t *pinStates) {
 	this->pinStates = pinStates;
 }
 
diff --git a/firmware/controllers/core/EfiWave.h b/firmware/controllers/core/EfiWave.h
index 4c20d4127d..3208e776c5 100644
--- a/firmware/controllers/core/EfiWave.h
+++ b/firmware/controllers/core/EfiWave.h
@@ -12,15 +12,24 @@
 #define PWM_PHASE_MAX_COUNT 250
 #define PWM_PHASE_MAX_WAVE_PER_PWM 3
 
+/**
+ * int8_t is probably less efficient then int32_t but we need
+ * to reduce memory footprint
+ *
+ * todo: migrate to bit-array to same memory? but this would
+ * this would some CPU cycles. see std::vector<bool>
+ */
+typedef int8_t pin_state_t;
+
 /**
  * @brief   PWM configuration for the specific output pin
  */
 class single_wave_s {
 public:
 	single_wave_s();
-	single_wave_s(int *pinStates);
-	void init(int *pinStates);
-	int *pinStates;
+	single_wave_s(pin_state_t *pinStates);
+	void init(pin_state_t *pinStates);
+	pin_state_t *pinStates;
 };
 
 class TriggerShape;
diff --git a/firmware/controllers/system/pwm_generator_logic.cpp b/firmware/controllers/system/pwm_generator_logic.cpp
index 5ab1df7841..41e79ef11c 100644
--- a/firmware/controllers/system/pwm_generator_logic.cpp
+++ b/firmware/controllers/system/pwm_generator_logic.cpp
@@ -18,8 +18,8 @@
 #define ITERATION_LIMIT 1000
 
 SimplePwm::SimplePwm() {
-	wave.init(pinStates);
-	sr[0] = wave;
+	waveInstance.init(pinStates);
+	sr[0] = waveInstance;
 	init(_switchTimes, sr);
 }
 
@@ -148,7 +148,7 @@ static void timerCallback(PwmConfig *state) {
  * Incoming parameters are potentially just values on current stack, so we have to copy
  * into our own permanent storage, right?
  */
-void copyPwmParameters(PwmConfig *state, int phaseCount, float *switchTimes, int waveCount, int **pinStates) {
+void copyPwmParameters(PwmConfig *state, int phaseCount, float *switchTimes, int waveCount, pin_state_t **pinStates) {
 	state->phaseCount = phaseCount;
 
 	for (int phaseIndex = 0; phaseIndex < phaseCount; phaseIndex++) {
@@ -163,7 +163,7 @@ void copyPwmParameters(PwmConfig *state, int phaseCount, float *switchTimes, int
 }
 
 void PwmConfig::weComplexInit(const char *msg, int phaseCount, float *switchTimes, int waveCount,
-		int **pinStates, pwm_cycle_callback *cycleCallback, pwm_gen_callback *stateChangeCallback) {
+		pin_state_t **pinStates, pwm_cycle_callback *cycleCallback, pwm_gen_callback *stateChangeCallback) {
 
 	efiAssertVoid(periodNt != 0, "period is not initialized");
 	if (phaseCount == 0) {
diff --git a/firmware/controllers/system/pwm_generator_logic.h b/firmware/controllers/system/pwm_generator_logic.h
index cd69c1198e..e4f57fe745 100644
--- a/firmware/controllers/system/pwm_generator_logic.h
+++ b/firmware/controllers/system/pwm_generator_logic.h
@@ -46,7 +46,7 @@ public:
 	void init(float *switchTimes, single_wave_s *waves);
 
 	void weComplexInit(const char *msg,
-			int phaseCount, float *swithcTimes, int waveCount, int **pinStates,
+			int phaseCount, float *swithcTimes, int waveCount, pin_state_t **pinStates,
 			pwm_cycle_callback *cycleCallback,
 			pwm_gen_callback *callback);
 
@@ -87,13 +87,14 @@ class SimplePwm : public PwmConfig {
 public:
 	SimplePwm();
 	void setSimplePwmDutyCycle(float dutyCycle);
-	int pinStates[2];
-	single_wave_s wave;
+	pin_state_t pinStates[2];
 	single_wave_s sr[1];
 	float _switchTimes[2];
+private:
+	single_wave_s waveInstance;
 };
 
 void copyPwmParameters(PwmConfig *state, int phaseCount, float *switchTimes,
-		int waveCount, int **pinStates);
+		int waveCount, pin_state_t **pinStates);
 
 #endif /* PWM_GENERATOR_LOGIC_H_ */
diff --git a/firmware/controllers/trigger/trigger_emulator_algo.cpp b/firmware/controllers/trigger/trigger_emulator_algo.cpp
index 337b16114f..503a34189a 100644
--- a/firmware/controllers/trigger/trigger_emulator_algo.cpp
+++ b/firmware/controllers/trigger/trigger_emulator_algo.cpp
@@ -52,9 +52,9 @@ EXTERN_ENGINE;
  * todo: should we simply re-use instances used by trigger_decoder?
  * todo: since we are emulating same shape we are decoding
  */
-static int pinStates1[PWM_PHASE_MAX_COUNT];
-static int pinStates2[PWM_PHASE_MAX_COUNT];
-static int pinStates3[PWM_PHASE_MAX_COUNT];
+static pin_state_t pinStates1[PWM_PHASE_MAX_COUNT];
+static pin_state_t pinStates2[PWM_PHASE_MAX_COUNT];
+static pin_state_t pinStates3[PWM_PHASE_MAX_COUNT];
 static single_wave_s waves[PWM_PHASE_MAX_WAVE_PER_PWM] = { single_wave_s(pinStates1), single_wave_s(pinStates2),
 		single_wave_s(pinStates3) };
 static single_wave_s sr[PWM_PHASE_MAX_WAVE_PER_PWM] = { waves[0], waves[1], waves[2] };
@@ -96,7 +96,7 @@ static void updateTriggerShapeIfNeeded(PwmConfig *state) {
 		applyNonPersistentConfiguration(logger, engine);
 
 		TriggerShape *s = &engine->triggerShape;
-		int *pinStates[PWM_PHASE_MAX_WAVE_PER_PWM] = { s->wave.waves[0].pinStates, s->wave.waves[1].pinStates,
+		pin_state_t *pinStates[PWM_PHASE_MAX_WAVE_PER_PWM] = { s->wave.waves[0].pinStates, s->wave.waves[1].pinStates,
 				s->wave.waves[2].pinStates };
 		copyPwmParameters(state, s->getSize(), s->wave.switchTimes, PWM_PHASE_MAX_WAVE_PER_PWM, pinStates);
 		state->safe.periodNt = -1; // this would cause loop re-initialization
@@ -137,7 +137,7 @@ void initTriggerEmulatorLogic(Logging *sharedLogger, Engine *engine) {
 
 	TriggerShape *s = &engine->triggerShape;
 	setTriggerEmulatorRPM(engineConfiguration->bc.triggerSimulatorFrequency, engine);
-	int *pinStates[PWM_PHASE_MAX_WAVE_PER_PWM] = { s->wave.waves[0].pinStates, s->wave.waves[1].pinStates,
+	pin_state_t *pinStates[PWM_PHASE_MAX_WAVE_PER_PWM] = { s->wave.waves[0].pinStates, s->wave.waves[1].pinStates,
 			s->wave.waves[2].pinStates };
 	triggerSignal.weComplexInit("position sensor", s->getSize(), s->wave.switchTimes, PWM_PHASE_MAX_WAVE_PER_PWM,
 			pinStates, updateTriggerShapeIfNeeded, emulatorApplyPinState);
diff --git a/firmware/controllers/trigger/trigger_structure.h b/firmware/controllers/trigger/trigger_structure.h
index f3cd104491..ed0b7e2006 100644
--- a/firmware/controllers/trigger/trigger_structure.h
+++ b/firmware/controllers/trigger/trigger_structure.h
@@ -19,7 +19,7 @@ class TriggerShape;
 #define TRIGGER_CHANNEL_COUNT 3
 
 class trigger_shape_helper {
-	int pinStates[TRIGGER_CHANNEL_COUNT][PWM_PHASE_MAX_COUNT];
+	pin_state_t pinStates[TRIGGER_CHANNEL_COUNT][PWM_PHASE_MAX_COUNT];
 public:
 	trigger_shape_helper();
 
diff --git a/firmware/hw_layer/microsecond_timer.c b/firmware/hw_layer/microsecond_timer.c
index ce210c3d7c..6c89d2dae4 100644
--- a/firmware/hw_layer/microsecond_timer.c
+++ b/firmware/hw_layer/microsecond_timer.c
@@ -31,6 +31,12 @@ static volatile int timerRestartCounter = 0;
 
 schfunc_t globalTimerCallback;
 
+static THD_WORKING_AREA(mwThreadStack, UTILITY_THREAD_STACK_SIZE);
+
+static const char * msg;
+
+static char buff[32];
+
 /**
  * sets the alarm to the specified number of microseconds from now.
  * This function should be invoked under kernel lock which would disable interrupts.
@@ -72,29 +78,27 @@ static void callback(GPTDriver *gptp) {
 	globalTimerCallback(NULL);
 }
 
-static THD_WORKING_AREA(mwThreadStack, UTILITY_THREAD_STACK_SIZE);
+static void usTimerWatchDog(void) {
+	if (getTimeNowNt() >= lastSetTimerTimeNt + 2 * CORE_CLOCK) {
+		strcpy(buff, "no_event");
+		itoa10(&buff[8], lastSetTimerValue);
+		firmwareError(buff);
+		return;
+	}
 
-static const char * msg;
+	msg = isTimerPending ? "No_cb too long" : "Timer not awhile";
+	// 2 seconds of inactivity would not look right
+	efiAssert(getTimeNowNt() < lastSetTimerTimeNt + 2 * CORE_CLOCK, msg, -1);
 
-static char buff[32];
+}
 
 static msg_t mwThread(int param) {
 	(void)param;
 	chRegSetThreadName("timer watchdog");
 
-	while (TRUE) {
+	while (true) {
 		chThdSleepMilliseconds(1000); // once a second is enough
-
-		if (getTimeNowNt() >= lastSetTimerTimeNt + 2 * CORE_CLOCK) {
-			strcpy(buff, "no_event");
-			itoa10(&buff[8], lastSetTimerValue);
-			firmwareError(buff);
-			return -1;
-		}
-
-		msg = isTimerPending ? "No_cb too long" : "Timer not awhile";
-		// 2 seconds of inactivity would not look right
-		efiAssert(getTimeNowNt() < lastSetTimerTimeNt + 2 * CORE_CLOCK, msg, -1);
+		usTimerWatchDog();
 	}
 #if defined __GNUC__
 	return -1;
diff --git a/firmware/hw_layer/pwm_generator.cpp b/firmware/hw_layer/pwm_generator.cpp
index 02b27caaad..f9ed9d25b2 100644
--- a/firmware/hw_layer/pwm_generator.cpp
+++ b/firmware/hw_layer/pwm_generator.cpp
@@ -36,9 +36,9 @@ void startSimplePwm(PwmConfig *state, const char *msg, OutputPin *output, float
 	efiAssertVoid(dutyCycle >= 0 && dutyCycle <= 1, "dutyCycle");
 
 	float switchTimes[] = { dutyCycle, 1 };
-	int pinStates0[] = { 0, 1 };
+	pin_state_t pinStates0[] = { 0, 1 };
 
-	int *pinStates[1] = { pinStates0 };
+	pin_state_t *pinStates[1] = { pinStates0 };
 
 	state->outputPins[0] = output;
 
diff --git a/firmware/rusefi.cpp b/firmware/rusefi.cpp
index 56ba49b9e2..860bb959de 100644
--- a/firmware/rusefi.cpp
+++ b/firmware/rusefi.cpp
@@ -253,7 +253,7 @@ void firmwareError(const char *fmt, ...) {
 	}
 }
 
-static char UNUSED_RAM_SIZE[7500];
+static char UNUSED_RAM_SIZE[10500];
 
 static char UNUSED_CCM_SIZE[8000] CCM_OPTIONAL;