dygma/Raise: Adjust the red component of LED colors

It seems the red component in the LEDs is a tiny bit stronger than the others,
so lets adjust the component's value a little on the firmware side to make
colors come out right.

This is not the best solution, it should eventually be configurable, but until
then, this is the best workaround we could come up with.

Signed-off-by: Gergely Nagy <algernon@keyboard.io>

src/kaleidoscope/device/dygma/raise/Hand.cpp

@@ -1,7 +1,7 @@
 /* -*- mode: c++ -*-
  * kaleidoscope::device::dygma::Raise -- Kaleidoscope device plugin for Dygma Raise
  * Copyright (C) 2017-2019  Keyboard.io, Inc
- * Copyright (C) 2017-2019  Dygma Lab S.L.
+ * Copyright (C) 2017-2020  Dygma Lab S.L.
  *
  * This program is free software: you can redistribute it and/or modify it under
  * the terms of the GNU General Public License as published by the Free Software
@@ -230,6 +230,15 @@ void Hand::sendLEDBank(uint8_t bank) {
       c = 0;
 
     data[i + 1] = pgm_read_byte(&gamma8[c]);
+
+    // The Red component on the Raise hardware appears to get more voltage than
+    // the others, resulting in colors slightly off. Adjust for that here by
+    // reducing the red component a little.
+    //
+    // FIXME(@anyone): This should eventually be configurable someway.
+    if ((i + 1) % 3 == 1 && data[i + 1] >= 26) {
+      data[i + 1] -= 26;
+    }
   }
   uint8_t result = twi_.writeTo(data, ELEMENTS(data));
 }