Show FINDA state as N/A if last received response is older than 1s.

Firmware/mmu.cpp

@@ -70,6 +70,7 @@ uint8_t mmu_extruder = MMU_FILAMENT_UNKNOWN;
 uint8_t tmp_extruder = MMU_FILAMENT_UNKNOWN;
 
 int8_t mmu_finda = -1;
+uint32_t mmu_last_finda_response = 0;
 
 int16_t mmu_version = -1;
 
@@ -264,6 +265,7 @@ void mmu_loop(void)
 		if (mmu_rx_ok() > 0)
 		{
 			fscanf_P(uart2io, PSTR("%hhu"), &mmu_finda); //scan finda from buffer
+			mmu_last_finda_response = _millis();
 			FDEBUG_PRINTF_P(PSTR("MMU => '%dok'\n"), mmu_finda);
 			puts_P(PSTR("MMU - ENABLED"));
 			mmu_enabled = true;
@@ -376,6 +378,7 @@ void mmu_loop(void)
 		if (mmu_rx_ok() > 0)
 		{
 			fscanf_P(uart2io, PSTR("%hhu"), &mmu_finda); //scan finda from buffer
+			mmu_last_finda_response = _millis();
 			FDEBUG_PRINTF_P(PSTR("MMU => '%dok'\n"), mmu_finda);
 			//printf_P(PSTR("Eact: %d\n"), int(e_active()));
 			if (!mmu_finda && CHECK_FSENSOR && fsensor_enabled) {

Firmware/mmu.h

@@ -14,6 +14,7 @@ extern uint8_t mmu_extruder;
 extern uint8_t tmp_extruder;
 
 extern int8_t mmu_finda;
+extern uint32_t mmu_last_finda_response;
 extern bool ir_sensor_detected;
 
 extern int16_t mmu_version;

Firmware/ultralcd.cpp

@@ -4016,7 +4016,8 @@ static void lcd_show_sensors_state()
 	uint8_t idler_state = STATE_NA;
 
 	pinda_state = READ(Z_MIN_PIN);
-	if (mmu_enabled) {
+	if (mmu_enabled && ((_millis() - mmu_last_finda_response) < 1000ul) )
+	{
 		finda_state = mmu_finda;
 	}
 	if (ir_sensor_detected) {