Create AnalogRGBLedStrip_Arduino_FastLED.ino

AnalogRGBLedStrip_Arduino_FastLED/AnalogRGBLedStrip_Arduino_FastLED.ino

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+/*---------------------------------------------------------*\
+|                                                           |
+|   Analog RGB (FastLED) LED Strip Driver                   |
+|   for use with Keyboard Visualizer VCUI                   |
+|                                                           |
+|   Adam Honse (calcprogrammer1) 12/9/2016                  |
+|   Onur Coskun (onurcskun) 28/4/2019                       |
+|                                                           |
+\*---------------------------------------------------------*/
+#include "FastLED.h"
+
+#ifdef __AVR__
+  #include <avr/power.h>
+#endif
+
+#define PACKET_SZ 6
+#define REDPIN   A0
+#define GREENPIN A1
+#define BLUEPIN  A2
+
+unsigned char serial_buffer[PACKET_SZ];
+unsigned int head = 0;
+unsigned int start;
+unsigned int checksum_1;
+unsigned int checksum_0;
+
+void showAnalogRGB(int r, int g, int b){
+  analogWrite(REDPIN,   r );
+  analogWrite(GREENPIN, g );
+  analogWrite(BLUEPIN,  b );
+}
+
+void setup(){
+  Serial.begin(115200);
+}
+
+void loop(){
+  if (Serial.available()) {
+    serial_buffer[head] = Serial.read();
+
+    if (head >= (PACKET_SZ - 1)) {
+      start = 0;
+      checksum_1 = head;
+      checksum_0 = head - 1;
+      head = 0;
+    }
+    else {
+      start = head + 1;
+      checksum_1 = head;
+      if ( head == 0 ){
+        checksum_0 = PACKET_SZ - 1;
+      }
+      else {
+        checksum_0 = head - 1;
+      }
+      head++;
+    }
+
+    if (serial_buffer[start] == 0xAA) {
+      unsigned short sum = 0;
+
+      for (int i = 0; i < checksum_0; i++){
+        sum += serial_buffer[i];
+      }
+
+      if (start > 0) {
+        for (int i = start; i < PACKET_SZ; i++) {
+          sum += serial_buffer[i];
+        }
+      }
+
+      //Test if valid write packet
+      if ((((unsigned short)serial_buffer[checksum_0] << 8 ) | serial_buffer[checksum_1] ) == sum) {
+        noInterrupts();
+        int idx = start + 1;
+        int g = serial_buffer[idx];
+        int r = serial_buffer[idx+1];
+        int b = serial_buffer[idx+2];
+        showAnalogRGB(255-r, 255-g, 255-b);
+        interrupts();
+      }
+    }
+  }
+}