blinkm: add initial support for BlinkM I2C controlled RGB LED

Signed-off-by: Ron Evans <ron@hybridgroup.com>

blinkm/registers.go

@@ -0,0 +1,23 @@
+package blinkm
+
+// Constants/addresses used for BlinkM.
+
+// The I2C address which this device listens to.
+const Address = 0x09
+
+// Registers, which in the case of the BlinkM are actually commands.
+const (
+	TO_RGB            = 0x6e
+	FADE_TO_RGB       = 0x63
+	FADE_TO_HSB       = 0x68
+	FADE_TO_RND_RGB   = 0x43
+	FADE_TO_RND_HSB   = 0x48
+	PLAY_LIGHT_SCRIPT = 0x70
+	STOP_SCRIPT       = 0x6f
+	SET_FADE          = 0x66
+	SET_TIME          = 0x74
+	GET_RGB           = 0x67
+	GET_ADDRESS       = 0x61
+	SET_ADDRESS       = 0x41
+	GET_FIRMWARE      = 0x5a
+)