various fixes (#129)

* various fixes:
- add folder for firmware known as working with hyperion
- rs232: add debug message for close and do not repeat "port not found" message more than neccessary
- v4l2: fix grabber started on creation when set to disabled
- cmake: add new platform x86-dev - this as most code coverage and is usefull for test/development. This is not for release

* add hints for effect-args

assets/firmware/arduino/adalight/adalight.ino

@@ -0,0 +1,102 @@
+#include "FastLED.h"
+
+// How many leds in your strip?
+#define NUM_LEDS 240
+
+// For led chips like Neopixels, which have a data line, ground, and power, you just
+// need to define DATA_PIN.  For led chipsets that are SPI based (four wires - data, clock,
+// ground, and power), like the LPD8806 define both DATA_PIN and CLOCK_PIN
+#define DATA_PIN 6
+#define CLOCK_PIN 13
+
+#define COLOR_ORDER RGB
+
+// Adalight sends a "Magic Word" (defined in /etc/boblight.conf) before sending the pixel data
+uint8_t prefix[] = {'A', 'd', 'a'}, hi, lo, chk, i;
+
+// Baudrate, higher rate allows faster refresh rate and more LEDs (defined in /etc/boblight.conf)
+#define serialRate 460800
+
+// Define the array of leds
+CRGB leds[NUM_LEDS];
+
+void setup() {
+  // Uncomment/edit one of the following lines for your leds arrangement.
+  // FastLED.addLeds<TM1803, DATA_PIN, RGB>(leds, NUM_LEDS);
+  // FastLED.addLeds<TM1804, DATA_PIN, RGB>(leds, NUM_LEDS);
+  // FastLED.addLeds<TM1809, DATA_PIN, RGB>(leds, NUM_LEDS);
+  // FastLED.addLeds<WS2811, DATA_PIN, RGB>(leds, NUM_LEDS);
+  // FastLED.addLeds<WS2812, DATA_PIN, RGB>(leds, NUM_LEDS);
+  FastLED.addLeds<WS2812B, DATA_PIN, RGB>(leds, NUM_LEDS);
+  // FastLED.addLeds<NEOPIXEL, DATA_PIN>(leds, NUM_LEDS);
+  // FastLED.addLeds<UCS1903, DATA_PIN, RGB>(leds, NUM_LEDS);
+  // FastLED.addLeds<UCS1903B, DATA_PIN, RGB>(leds, NUM_LEDS);
+  // FastLED.addLeds<GW6205, DATA_PIN, RGB>(leds, NUM_LEDS);
+  // FastLED.addLeds<GW6205_400, DATA_PIN, RGB>(leds, NUM_LEDS);
+
+  // FastLED.addLeds<WS2801, RGB>(leds, NUM_LEDS);
+  // FastLED.addLeds<SM16716, RGB>(leds, NUM_LEDS);
+  // FastLED.addLeds<LPD8806, RGB>(leds, NUM_LEDS);
+
+  // FastLED.addLeds<WS2801, DATA_PIN, CLOCK_PIN, RGB>(leds, NUM_LEDS);
+  // FastLED.addLeds<SM16716, DATA_PIN, CLOCK_PIN, RGB>(leds, NUM_LEDS);
+  // FastLED.addLeds<LPD8806, DATA_PIN, CLOCK_PIN, RGB>(leds, NUM_LEDS);
+
+  // initial RGB flash
+  LEDS.showColor(CRGB(255, 0, 0));
+  delay(500);
+  LEDS.showColor(CRGB(0, 255, 0));
+  delay(500);
+  LEDS.showColor(CRGB(0, 0, 255));
+  delay(500);
+  LEDS.showColor(CRGB(0, 0, 0));
+
+  Serial.begin(serialRate);
+  Serial.print("Ada\n"); // Send "Magic Word" string to host
+
+}
+
+void loop() {
+  // wait for first byte of Magic Word
+  for (i = 0; i < sizeof prefix; ++i) {
+waitLoop: while (!Serial.available()) ;;
+    // Check next byte in Magic Word
+    if (prefix[i] == Serial.read()) continue;
+    // otherwise, start over
+    i = 0;
+    goto waitLoop;
+  }
+
+  // Hi, Lo, Checksum
+
+  while (!Serial.available()) ;;
+  hi = Serial.read();
+  while (!Serial.available()) ;;
+  lo = Serial.read();
+  while (!Serial.available()) ;;
+  chk = Serial.read();
+
+  // if checksum does not match go back to wait
+  if (chk != (hi ^ lo ^ 0x55))
+  {
+    i = 0;
+    goto waitLoop;
+  }
+
+  memset(leds, 0, NUM_LEDS * sizeof(struct CRGB));
+  // read the transmission data and set LED values
+  for (uint8_t i = 0; i < NUM_LEDS; i++) {
+    byte r, g, b;
+    while (!Serial.available());
+    r = Serial.read();
+    while (!Serial.available());
+    g = Serial.read();
+    while (!Serial.available());
+    b = Serial.read();
+    leds[i].r = r;
+    leds[i].g = g;
+    leds[i].b = b;
+  }
+  // shows new values
+  FastLED.show();
+}