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- /*
- * Arduino interface for the use of APA102 strip LEDs
- * Uses Adalight protocol and is compatible with Ambibox, Boblight, Prismatik etc...
- * "Magic Word" for synchronisation is 'Ada' followed by LED High, Low and Checksum
- * @library: FastLED v3.1.6
- */
- #include "FastLED.h"
- #define NUM_LEDS 140
- #define DATA_PIN 11
- #define CLOCK_PIN 12
- // Baudrate, higher rate allows faster refresh rate and more LEDs (defined in /etc/boblight.conf)
- #define serialRate 115200
- // 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;
- // Initialise LED-array
- CRGB leds[NUM_LEDS];
- void setup() {
- // 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);
- FastLED.addLeds<APA102, DATA_PIN, CLOCK_PIN>(leds, NUM_LEDS);
- Serial.begin(serialRate);
- // Send "Magic Word" string to host
- Serial.print("Ada\n");
- }
- 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();
- }
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