Option to clear LEDs during esp8266 startup (#31)

platformio.ini

@@ -1,11 +1,12 @@
 ; You can adjust speed of the serial port communication by adjusting 'SERIALCOM_SPEED' variable in [env] section
+; Also you can force to clear LEDs on the esp8266 start up (-DCLEAR_LEDS=number_of_leds_to_clear)
 ; The pinout can not be changed for esp8266 board
 
 [platformio]
 default_envs = SK6812_RGBW_COLD, SK6812_RGBW_NEUTRAL, WS281x_RGB, SPI_APA102_SK9822_HD107, SPI_WS2801
 
 [env]
-build_flags = -DSERIALCOM_SPEED=2000000
+build_flags = -DSERIALCOM_SPEED=2000000 ;-DCLEAR_LEDS=24 ;remove leading semi-colon to uncomment
 extra_scripts = pre:extra_script.py
 platform = espressif8266
 board = d1_mini

src/main.cpp

@@ -38,6 +38,9 @@
 #define _XSTR2(x,y) _STR(x) _STR(y)
 #define VAR_NAME_VALUE2(var) #var " = " _XSTR2(var)
 
+#ifdef CLEAR_LEDS
+	#pragma message(VAR_NAME_VALUE(CLEAR_LEDS))
+#endif
 #ifdef NEOPIXEL_RGBW
 	#pragma message(VAR_NAME_VALUE(NEOPIXEL_RGBW))
 #endif
@@ -77,6 +80,18 @@ void setup()
 	Serial.begin(SERIALCOM_SPEED);
 	while (!Serial) continue;
 
+#ifdef CLEAR_LEDS
+	LED_DRIVER* _ledStrip = new LED_DRIVER(CLEAR_LEDS);
+	ColorDefinition _black(0);
+	_ledStrip->Begin();
+	for(int i = 0; i < CLEAR_LEDS; i++)
+		_ledStrip->SetPixelColor(i, _black);
+	_ledStrip->Dirty();
+	_ledStrip->Show(false);
+	delay(10);
+	delete _ledStrip;
+#endif
+
 	// Display config
 	Serial.println(HELLO_MESSAGE);