diff --git a/firmware/controllers/engine_controller.cpp b/firmware/controllers/engine_controller.cpp
index f503dcf99b..36d11ed84d 100644
--- a/firmware/controllers/engine_controller.cpp
+++ b/firmware/controllers/engine_controller.cpp
@@ -163,6 +163,7 @@ int getTimeNowSeconds(void) {
 }
 
 static void onEvenyGeneralMilliseconds(void *arg) {
+	(void)arg;
 	/**
 	 * We need to push current value into the 64 bit counter often enough so that we do not miss an overflow
 	 */
@@ -191,6 +192,7 @@ static void initPeriodicEvents(void) {
 }
 
 static void fuelPumpOff(void *arg) {
+	(void)arg;
 	if (getOutputPinValue(FUEL_PUMP_RELAY))
 		scheduleMsg(&logger, "fuelPump OFF at %s%d", hwPortname(boardConfiguration->fuelPumpPin));
 	turnOutputPinOff(FUEL_PUMP_RELAY);
diff --git a/firmware/controllers/idle_thread.cpp b/firmware/controllers/idle_thread.cpp
index 324d761565..5803353a83 100644
--- a/firmware/controllers/idle_thread.cpp
+++ b/firmware/controllers/idle_thread.cpp
@@ -80,6 +80,7 @@ static void setIdleValvePwm(int value) {
 }
 
 static msg_t ivThread(int param) {
+	(void)param;
 	chRegSetThreadName("IdleValve");
 
 	int currentIdleValve = -1;
diff --git a/firmware/controllers/system/SingleTimerExecutor.cpp b/firmware/controllers/system/SingleTimerExecutor.cpp
index b125bec626..685d47f839 100644
--- a/firmware/controllers/system/SingleTimerExecutor.cpp
+++ b/firmware/controllers/system/SingleTimerExecutor.cpp
@@ -28,6 +28,7 @@ static Executor instance;
 extern schfunc_t globalTimerCallback;
 
 static void executorCallback(void *arg) {
+	(void)arg;
 	instance.onTimerCallback();
 }
 
diff --git a/firmware/controllers/trigger/rpm_calculator.cpp b/firmware/controllers/trigger/rpm_calculator.cpp
index 5fc193635d..e7320bec83 100644
--- a/firmware/controllers/trigger/rpm_calculator.cpp
+++ b/firmware/controllers/trigger/rpm_calculator.cpp
@@ -152,6 +152,7 @@ static void onTdcCallback(void) {
  * This trigger callback schedules the actual physical TDC callback in relation to trigger synchronization point.
  */
 static void tdcMarkCallback(trigger_event_e ckpSignalType, uint32_t index0, void *arg) {
+	(void)ckpSignalType;
 	bool isTriggerSynchronizationPoint = index0 == 0;
 	if (isTriggerSynchronizationPoint) {
 		int revIndex2 = getRevolutionCounter() % 2;
diff --git a/firmware/controllers/trigger/trigger_central.cpp b/firmware/controllers/trigger/trigger_central.cpp
index 44dd94648e..49099028fa 100644
--- a/firmware/controllers/trigger/trigger_central.cpp
+++ b/firmware/controllers/trigger/trigger_central.cpp
@@ -222,6 +222,7 @@ float getTriggerDutyCycle(int index) {
 }
 
 void initTriggerCentral(Engine *engine) {
+	// todo: use 'engine' parameter and eliminate 'extern'
 	strcpy((char*) shaft_signal_msg_index, "_");
 
 #if EFI_WAVE_CHART
diff --git a/firmware/controllers/trigger/trigger_decoder.h b/firmware/controllers/trigger/trigger_decoder.h
index 5c7a0ccae5..1cbfdb0043 100644
--- a/firmware/controllers/trigger/trigger_decoder.h
+++ b/firmware/controllers/trigger/trigger_decoder.h
@@ -45,7 +45,7 @@ public:
 	/**
 	 * Total time result for previous trigger cycle
 	 */
-	int prevTotalTime[PWM_PHASE_MAX_WAVE_PER_PWM];
+	uint32_t prevTotalTime[PWM_PHASE_MAX_WAVE_PER_PWM];
 	int expectedTotalTime[PWM_PHASE_MAX_WAVE_PER_PWM];
 
 private:
@@ -53,15 +53,15 @@ private:
 	/**
 	 * index within trigger revolution, from 0 to trigger event count
 	 */
-	int current_index;
+	uint32_t current_index;
 	/**
 	 * Number of actual events within current trigger cycle
 	 * see trigger_shape_s
 	 */
-	int eventCount[PWM_PHASE_MAX_WAVE_PER_PWM];
+	uint32_t eventCount[PWM_PHASE_MAX_WAVE_PER_PWM];
 	uint64_t timeOfPreviousEvent[PWM_PHASE_MAX_WAVE_PER_PWM];
 	uint64_t totalEventCountBase;
-	int totalRevolutionCounter;
+	uint32_t totalRevolutionCounter;
 	bool isFirstEvent;
 	uint64_t prevCycleDuration;
 	uint64_t startOfCycle;
diff --git a/firmware/hw_layer/io_pins.c b/firmware/hw_layer/io_pins.c
index a0a1430049..e09bda4b60 100644
--- a/firmware/hw_layer/io_pins.c
+++ b/firmware/hw_layer/io_pins.c
@@ -78,6 +78,7 @@ void setDefaultPinState(io_pin_e pin, pin_output_mode_e *outputMode) {
 }
 
 static void comBlinkingThread(void *arg) {
+	(void)arg;
 	chRegSetThreadName("communication blinking");
 	while (TRUE) {
 		int delay;
@@ -105,6 +106,7 @@ static void comBlinkingThread(void *arg) {
 int isTriggerDecoderError(void);
 
 static void errBlinkingThread(void *arg) {
+	(void)arg;
 	chRegSetThreadName("err blinking");
 #if EFI_ENGINE_CONTROL
 	while (TRUE) {
diff --git a/firmware/hw_layer/microsecond_timer.c b/firmware/hw_layer/microsecond_timer.c
index 7429321447..460277d47b 100644
--- a/firmware/hw_layer/microsecond_timer.c
+++ b/firmware/hw_layer/microsecond_timer.c
@@ -52,6 +52,7 @@ void setHardwareUsTimer(int32_t timeUs) {
 }
 
 static void callback(GPTDriver *gptp) {
+	(void)gptp;
 	timerCallbackCounter++;
 	if (globalTimerCallback == NULL) {
 		firmwareError("NULL globalTimerCallback");
@@ -78,6 +79,7 @@ static const char * msg;
 static char buff[32];
 
 static msg_t mwThread(int param) {
+	(void)param;
 	chRegSetThreadName("timer watchdog");
 
 	while (TRUE) {