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diff --git a/src/gadc/sys_options.h b/src/gadc/sys_options.h
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+/*
+ * This file is subject to the terms of the GFX License. If a copy of
+ * the license was not distributed with this file, you can obtain one at:
+ *
+ *              http://ugfx.org/license.html
+ */
+
+/**
+ * @file    src/gadc/sys_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 GADC sample rate
+	 * @details	Defaults to 44000
+	 * @note	This value must be less than half the maximum sample rate allowed by the CPU.
+	 * 			This is to ensure there is time between high speed samples to perform low
+	 * 			speed device sampling.
+	 */
+	#ifndef GADC_MAX_HIGH_SPEED_SAMPLERATE
+		#define GADC_MAX_HIGH_SPEED_SAMPLERATE	44000
+	#endif
+/** @} */
+
+#endif /* _GADC_OPTIONS_H */
+/** @} */