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diff --git a/include/gadc/options.h b/include/gadc/options.h
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+/*
+    ChibiOS/GFX - Copyright (C) 2012
+                 Joel Bodenmann aka Tectu <joel@unormal.org>
+
+    This file is part of ChibiOS/GFX.
+
+    ChibiOS/GFX 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 Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    ChibiOS/GFX is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+/**
+ * @file    include/gadc/options.h
+ * @brief   GADC - Periodic ADC subsystem options header file.
+ *
+ * @addtogroup GADC
+ * @{
+ */
+
+#ifndef _GADC_OPTIONS_H
+#define _GADC_OPTIONS_H
+
+/**
+ * @name    GADC Functionality to be included
+ * @{
+ */
+/**
+ * @}
+ *
+ * @name    GADC Optional Sizing Parameters
+ * @{
+ */
+	/**
+	 * @brief   The maximum simultaneous GADC low speed device conversions
+	 * @details	Defaults to 4
+	 * @note	This value must be less than the number of conversions that can occur
+	 * 			in a single high speed ADC cycle including the high speed ADC conversion.
+	 * 			For example, if the ADC can run at 132k samples per second and the high speed
+	 * 			virtual ADC is using 44kHz then GADC_MAX_LOWSPEED_DEVICES should be set to
+	 * 			132/44 - 1 = 2
+	 */
+	#ifndef GADC_MAX_LOWSPEED_DEVICES
+		#define GADC_MAX_LOWSPEED_DEVICES	4
+	#endif
+/** @} */
+
+#endif /* _GADC_OPTIONS_H */
+/** @} */