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diff --git a/os/hal/include/hal_opamp.h b/os/hal/include/hal_opamp.h
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+++ b/os/hal/include/hal_opamp.h
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+/*
+    ChibiOS - Copyright (C) 2006..2019 Giovanni Di Sirio
+              Copyright (C) 2019 Fabien Poussin (fabien.poussin (at) google's mail)
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+        http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+*/
+
+#ifndef HAL_OPAMP_H_
+#define HAL_OPAMP_H_
+
+#include "hal.h"
+
+#if (HAL_USE_OPAMP == TRUE) || defined(__DOXYGEN__)
+
+/*===========================================================================*/
+/* Driver constants.                                                         */
+/*===========================================================================*/
+
+#define OPAMP_P_BELOW_M (0U)
+#define OPAMP_M_BELOW_P (1U)
+
+/*===========================================================================*/
+/* Driver pre-compile time settings.                                         */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Derived constants and error checks.                                       */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver data structures and types.                                         */
+/*===========================================================================*/
+
+/**
+ * @brief   Driver state machine possible states.
+ */
+typedef enum {
+  OPAMP_UNINIT = 0,                   /**< Not initialized.                   */
+  OPAMP_STOP = 1,                     /**< Stopped.                           */
+  OPAMP_ACTIVE = 2,                   /**< Active.                            */
+  OPAMP_CALIBRATING = 3,              /**< Calibration in progress.           */
+} opampstate_t;
+
+/**
+ * @brief   Type of a structure representing an OPAMP driver.
+ */
+typedef struct OPAMPDriver OPAMPDriver;
+
+#include "hal_opamp_lld.h"
+
+/*===========================================================================*/
+/* Driver macros.                                                            */
+/*===========================================================================*/
+
+/**
+ * @brief   Calibrate opamps
+ * *
+ * @iclass
+ */
+#define opampCalibrate() opamp_lld_calibrate()
+/** @} */
+
+/**
+ * @name    Low Level driver helper macros
+ * @{
+ */
+
+/*===========================================================================*/
+/* External declarations.                                                    */
+/*===========================================================================*/
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+  void opampInit(void);
+  void opampObjectInit(OPAMPDriver *opamp);
+  void opampStart(OPAMPDriver *opamp, const OPAMPConfig *config);
+  void opampStop(OPAMPDriver *opamp);
+  void opampEnable(OPAMPDriver *opamp);
+  void opampDisable(OPAMPDriver *opamp);
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* HAL_USE_OPAMP */
+
+#endif /* HAL_OPAMP_H_ */