Update LED.MD

LED.MD

@@ -47,3 +47,34 @@ void SetLed(unsigned char ledid,unsigned char status)
 
 SetLed(LED_1_GREEN, LED_STATUS_ON);
 ```
+
+Notes:  
+
+In the CP's drivers, the LED were addressed in a funny ways:
+
+```
+int _SetLedState(int led,int state)
+
+{
+  char led_id;
+  int ret;
+  char cmdRed [3];
+  char cmdGreen [3];
+  
+  ret = -1;
+  if (led - 1U < 3) 
+  {
+    led_id = (char)led * '\x02';
+    cmdRed[2] = (led_id + -1) * '\x10' | (byte)state & 1;
+    cmdGreen[2] = (led_id + -2) * '\x10' | (byte)((uint)state >> 1) & 1;
+    cmdGreen[0] = '\x1b';
+    cmdGreen[1] = 'L';
+    cmdRed[0] = '\x1b';
+    cmdRed[1] = 'L';
+    SendCommand(fd,cmdGreen,3);
+    SendCommand(fd,cmdRed,3);
+    ret = 0;
+  }
+  return ret;
+}
+```