Adding rudimentary OPAMP Driver

8 files changed, 724 insertions, 0 deletions

diff --git a/os/hal/hal.mk b/os/hal/hal.mk
index 377ffa9..f6b4edd 100644
--- a/os/hal/hal.mk
+++ b/os/hal/hal.mk
@@ -72,6 +72,9 @@ endif
 ifneq ($(findstring HAL_USE_COMP TRUE,$(HALCONF)),)

 HALSRC_CONTRIB += ${CHIBIOS_CONTRIB}/os/hal/src/hal_comp.c

 endif

+ifneq ($(findstring HAL_USE_OPAMP TRUE,$(HALCONF)),)

+HALSRC_CONTRIB += ${CHIBIOS_CONTRIB}/os/hal/src/hal_opamp.c

+endif

 else

 HALSRC_CONTRIB := ${CHIBIOS_CONTRIB}/os/hal/src/hal_community.c \

                   ${CHIBIOS_CONTRIB}/os/hal/src/hal_nand.c \

diff --git a/os/hal/include/hal_community.h b/os/hal/include/hal_community.h
index 83b1f02..f84e90a 100644
--- a/os/hal/include/hal_community.h
+++ b/os/hal/include/hal_community.h
@@ -75,6 +75,10 @@
 #define HAL_USE_COMP                        FALSE

 #endif

 

+#if !defined(HAL_USE_OPAMP)

+#define HAL_USE_OPAMP                        FALSE

+#endif

+

 /* Abstract interfaces.*/

 

 /* Shared headers.*/

@@ -87,6 +91,7 @@
 #include "hal_timcap.h"

 #include "hal_qei.h"

 #include "hal_comp.h"

+#include "hal_opamp.h"

 

 /* Complex drivers.*/

 #include "hal_onewire.h"

diff --git a/os/hal/include/hal_opamp.h b/os/hal/include/hal_opamp.h
new file mode 100644
index 0000000..383e928
--- /dev/null
+++ b/os/hal/include/hal_opamp.h
@@ -0,0 +1,110 @@
+/*
+    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.                                                         */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* 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_READY = 2,                    /**< Ready.                             */
+  OPAMP_ACTIVE = 3,                   /**< Active cycle phase.                */
+} opampstate_t;
+
+/**
+ * @brief   Type of a structure representing an OPAMP driver.
+ */
+typedef struct OPAMPDriver OPAMPDriver;
+
+#include "hal_opamp_lld.h"
+
+/*===========================================================================*/
+/* Driver macros.                                                            */
+/*===========================================================================*/
+
+/**
+ * @name    Macro Functions
+ * @{
+ */
+/**
+ * @brief   Enables the input capture.
+ *
+ * @param[in] opamp      pointer to the @p OPAMPDriver object
+ *
+ * @iclass
+ */
+#define opampEnableI(opamp) opamp_lld_enable(opamp)
+
+/**
+ * @brief   Disables the input capture.
+ *
+ * @param[in] opamp      pointer to the @p OPAMPDriver object
+ *
+ * @iclass
+ */
+#define opampDisableI(opamp) opamp_lld_disable(opamp)
+/** @} */
+
+
+/**
+ * @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_ */
diff --git a/os/hal/ports/STM32/LLD/OPAMPv1/driver.mk b/os/hal/ports/STM32/LLD/OPAMPv1/driver.mk
new file mode 100644
index 0000000..08dc0f4
--- /dev/null
+++ b/os/hal/ports/STM32/LLD/OPAMPv1/driver.mk
@@ -0,0 +1,9 @@
+ifeq ($(USE_SMART_BUILD),yes)

+ifneq ($(findstring HAL_USE_OPAMP TRUE,$(HALCONF)),)

+PLATFORMSRC_CONTRIB += ${CHIBIOS_CONTRIB}/os/hal/ports/STM32/LLD/OPAMPv1/hal_opamp_lld.c

+endif

+else

+PLATFORMSRC_CONTRIB += ${CHIBIOS_CONTRIB}/os/hal/ports/STM32/LLD/OPAMPv1/hal_opamp_lld.c

+endif

+

+PLATFORMINC_CONTRIB += ${CHIBIOS_CONTRIB}/os/hal/ports/STM32/LLD/OPAMPv1

diff --git a/os/hal/ports/STM32/LLD/OPAMPv1/hal_opamp_lld.c b/os/hal/ports/STM32/LLD/OPAMPv1/hal_opamp_lld.c
new file mode 100644
index 0000000..7251002
--- /dev/null
+++ b/os/hal/ports/STM32/LLD/OPAMPv1/hal_opamp_lld.c
@@ -0,0 +1,184 @@
+/*
+    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.
+*/
+
+
+/**
+ * @file    STM32/hal_opamp_lld.c
+ * @brief   STM32 Operational Amplifier subsystem low level driver header.
+ *
+ * @addtogroup OPAMP
+ * @{
+ */
+
+#include "hal.h"
+
+#if HAL_USE_OPAMP || defined(__DOXYGEN__)
+
+#include "hal_opamp.h"
+
+/*===========================================================================*/
+/* Driver local definitions.                                                 */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver exported variables.                                                */
+/*===========================================================================*/
+
+/**
+ * @brief   OPAMPD1 driver identifier.
+ * @note    The driver OPAMPD1 allocates the comparator OPAMP1 when enabled.
+ */
+#if STM32_OPAMP_USE_OPAMP1 || defined(__DOXYGEN__)
+OPAMPDriver OPAMPD1;
+#endif
+
+/**
+ * @brief   OPAMPD2 driver identifier.
+ * @note    The driver OPAMPD2 allocates the comparator OPAMP2 when enabled.
+ */
+#if STM32_OPAMP_USE_OPAMP2 || defined(__DOXYGEN__)
+OPAMPDriver OPAMPD2;
+#endif
+
+/**
+ * @brief   OPAMPD3 driver identifier.
+ * @note    The driver OPAMPD3 allocates the comparator OPAMP3 when enabled.
+ */
+#if STM32_OPAMP_USE_OPAMP3 || defined(__DOXYGEN__)
+OPAMPDriver OPAMPD3;
+#endif
+
+/**
+ * @brief   OPAMPD4 driver identifier.
+ * @note    The driver OPAMPD4 allocates the comparator OPAMP4 when enabled.
+ */
+#if STM32_OPAMP_USE_OPAMP4 || defined(__DOXYGEN__)
+OPAMPDriver OPAMPD4;
+#endif
+
+/*===========================================================================*/
+/* Driver local variables and types.                                         */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver local functions.                                                   */
+/*===========================================================================*/
+
+
+/*===========================================================================*/
+/* Driver interrupt handlers.                                                */
+/*===========================================================================*/
+
+
+/*===========================================================================*/
+/* Driver exported functions.                                                */
+/*===========================================================================*/
+
+/**
+ * @brief   Low level OPAMP driver initialization.
+ *
+ * @notapi
+ */
+void opamp_lld_init(void) {
+
+#if STM32_OPAMP_USE_OPAMP1
+  /* Driver initialization.*/
+  opampObjectInit(&OPAMPD1);
+  OPAMPD1.reg = OPAMP;
+  OPAMPD1.reg->CSR = 0;
+#endif
+
+#if STM32_OPAMP_USE_OPAMP2
+  /* Driver initialization.*/
+  opampObjectInit(&OPAMPD2);
+  OPAMPD2.reg = OPAMP2;
+  OPAMPD2.reg->CSR = 0;
+#endif
+
+#if STM32_OPAMP_USE_OPAMP3
+  /* Driver initialization.*/
+  opampObjectInit(&OPAMPD3);
+  OPAMPD3.reg = OPAMP3;
+  OPAMPD3.reg->CSR = 0;
+#endif
+
+#if STM32_OPAMP_USE_OPAMP4
+  /* Driver initialization.*/
+  opampObjectInit(&OPAMPD4);
+  OPAMPD4.reg = OPAMP4;
+  OPAMPD4.reg->CSR = 0;
+#endif
+
+}
+
+/**
+ * @brief   Configures and activates the OPAMP peripheral.
+ *
+ * @param[in] compp      pointer to the @p OPAMPDriver object
+ *
+ * @notapi
+ */
+void opamp_lld_start(OPAMPDriver *compp) {
+
+  // Apply CSR Execpt the enable bit.
+  compp->reg->CSR = compp->config->csr & ~OPAMP_CSR_OPAMPxEN;
+
+}
+
+/**
+ * @brief   Deactivates the comp peripheral.
+ *
+ * @param[in] compp      pointer to the @p OPAMPDriver object
+ *
+ * @notapi
+ */
+void opamp_lld_stop(OPAMPDriver *compp) {
+
+  if (compp->state == OPAMP_READY) {
+
+    compp->reg->CSR = 0;
+  }
+
+}
+
+/**
+ * @brief   Enables the output.
+ *
+ * @param[in] compp      pointer to the @p OPAMPDriver object
+ *
+ * @notapi
+ */
+void opamp_lld_enable(OPAMPDriver *compp) {
+
+   compp->reg->CSR |= OPAMP_CSR_OPAMPxEN; /* Enable */
+}
+
+/**
+ * @brief   Disables the output.
+ *
+ * @param[in] compp      pointer to the @p OPAMPDriver object
+ *
+ * @notapi
+ */
+void opamp_lld_disable(OPAMPDriver *compp) {
+
+  compp->reg->CSR &= ~OPAMP_CSR_OPAMPxEN; /* Disable */
+}
+
+#endif /* HAL_USE_OPAMP */
+
+/** @} */
diff --git a/os/hal/ports/STM32/LLD/OPAMPv1/hal_opamp_lld.h b/os/hal/ports/STM32/LLD/OPAMPv1/hal_opamp_lld.h
new file mode 100644
index 0000000..508cea7
--- /dev/null
+++ b/os/hal/ports/STM32/LLD/OPAMPv1/hal_opamp_lld.h
@@ -0,0 +1,257 @@
+/*
+    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.
+*/
+
+/**
+ * @file    STM32/opamp_lld.h
+ * @brief   STM32 Operational Amplifier subsystem low level driver header.
+ *
+ * @addtogroup OPAMP
+ * @{
+ */
+
+#ifndef HAL_OPAMP_LLD_H_
+#define HAL_OPAMP_LLD_H_
+
+#include "hal.h"
+
+#if HAL_USE_OPAMP || defined(__DOXYGEN__)
+
+/*===========================================================================*/
+/* Driver constants.                                                         */
+/*===========================================================================*/
+
+
+#define STM32_OPAMP_InvertingInput_IO1          ((uint32_t)0x00000000) /*!< IO1 (PC5 for OPAMP1 and OPAMP2, PB10 for OPAMP3 and OPAMP4)
+                                                                       connected to OPAMPx inverting input */
+#define STM32_OPAMP_InvertingInput_IO2          OPAMP_CSR_VMSEL_0      /*!< IO2 (PA3 for OPAMP1, PA5 for OPAMP2, PB2 for OPAMP3, PD8 for OPAMP4)
+                                                                       connected to OPAMPx inverting input */
+#define STM32_OPAMP_InvertingInput_PGA          OPAMP_CSR_VMSEL_1      /*!< Resistor feedback output connected to OPAMPx inverting input (PGA mode) */
+#define STM32_OPAMP_InvertingInput_Vout         OPAMP_CSR_VMSEL        /*!< Vout connected to OPAMPx inverting input (follower mode) */
+
+
+#define STM32_OPAMP_NonInvertingInput_IO1       ((uint32_t)0x00000000) /*!< IO1 (PA7 for OPAMP1, PD14 for OPAMP2, PB13 for OPAMP3, PD11 for OPAMP4)
+                                                                       connected to OPAMPx non inverting input */
+#define STM32_OPAMP_NonInvertingInput_IO2       OPAMP_CSR_VPSEL_0      /*!< IO2 (PA5 for OPAMP1, PB14 for OPAMP2, PA5 for OPAMP3, PB11 for OPAMP4)
+                                                                       connected to OPAMPx non inverting input */
+#define STM32_OPAMP_NonInvertingInput_IO3       OPAMP_CSR_VPSEL_1      /*!< IO3 (PA3 for OPAMP1, PB0 for OPAMP2, PA1 for OPAMP3, PA4 for OPAMP4)
+                                                                       connected to OPAMPx non inverting input */
+#define STM32_OPAMP_NonInvertingInput_IO4       OPAMP_CSR_VPSEL        /*!< IO4 (PA1 for OPAMP1, PA7 for OPAMP2, PB0 for OPAMP3, PB13 for OPAMP4)
+                                                                       connected to OPAMPx non inverting input */
+
+
+#define STM32_OPAMP_PGAGain_2                   ((uint32_t)0x00000000)
+#define STM32_OPAMP_PGAGain_4                   OPAMP_CSR_PGGAIN_0
+#define STM32_OPAMP_PGAGain_8                   OPAMP_CSR_PGGAIN_1
+#define STM32_OPAMP_PGAGain_16                  ((uint32_t)0x0000C000)
+
+#define STM32_OPAMP_PGAConnect_No               ((uint32_t)0x00000000)
+#define STM32_OPAMP_PGAConnect_IO1              OPAMP_CSR_PGGAIN_3
+#define STM32_OPAMP_PGAConnect_IO2              ((uint32_t)0x00030000)
+
+#define STM32_OPAMP_Input_Inverting             ((uint32_t)0x00000018) /*!< Inverting input */
+#define STM32_OPAMP_Input_NonInverting          ((uint32_t)0x00000013) /*!< Non inverting input */
+
+#define STM32_OPAMP_Vref_3VDDA                  ((uint32_t)0x00000000) /*!< OPMAP Vref = 3.3% VDDA */
+#define STM32_OPAMP_Vref_10VDDA                 OPAMP_CSR_CALSEL_0     /*!< OPMAP Vref = 10% VDDA  */
+#define STM32_OPAMP_Vref_50VDDA                 OPAMP_CSR_CALSEL_1     /*!< OPMAP Vref = 50% VDDA  */
+#define STM32_OPAMP_Vref_90VDDA                 OPAMP_CSR_CALSEL       /*!< OPMAP Vref = 90% VDDA  */
+
+#define STM32_OPAMP_Trimming_Factory            ((uint32_t)0x00000000) /*!< Factory trimming */
+#define STM32_OPAMP_Trimming_User               OPAMP_CSR_USERTRIM     /*!< User trimming */
+
+#define STM32_OPAMP_OutputLevel_High            OPAMP_CSR_OUTCAL
+#define STM32_OPAMP_OutputLevel_Low             ((uint32_t)0x00000000)
+
+
+#if defined(STM32F302xB) || defined(STM32F302xC) || defined(STM32F302xD) \
+|| defined(STM32F302xE) || defined(STM32F302xc) || defined(STM32F302xe) \
+|| defined(STM32L1XX) || defined(STM32L4XX) || defined(STM32H7XX)
+#define STM32_HAS_OPAMP1 TRUE
+#define STM32_HAS_OPAMP2 TRUE
+#define STM32_HAS_OPAMP3 FALSE
+#define STM32_HAS_OPAMP4 FALSE
+
+#elif defined(STM32F303xB) || defined(STM32F303xC) || defined(STM32F303xE) \
+|| defined(STM32F358xx) || defined(STM32F398xx)
+#define STM32_HAS_OPAMP1 TRUE
+#define STM32_HAS_OPAMP2 TRUE
+#define STM32_HAS_OPAMP3 TRUE
+#define STM32_HAS_OPAMP4 TRUE
+
+#else
+#define STM32_HAS_OPAMP1 FALSE
+#define STM32_HAS_OPAMP2 FALSE
+#define STM32_HAS_OPAMP3 FALSE
+#define STM32_HAS_OPAMP4 FALSE
+
+#endif
+
+
+/*===========================================================================*/
+/* Driver pre-compile time settings.                                         */
+/*===========================================================================*/
+
+/**
+ * @name    Configuration options
+ * @{
+ */
+
+/**
+ * @brief   OPAMPD1 driver enable switch.
+ * @details If set to @p TRUE the support for OPAMPD1 is included.
+ * @note    The default is @p FALSE.
+ */
+#if !defined(STM32_OPAMP_USE_OPAMP1) || defined(__DOXYGEN__)
+#define STM32_OPAMP_USE_OPAMP1                  FALSE
+#endif
+
+/**
+ * @brief   OPAMPD2 driver enable switch.
+ * @details If set to @p TRUE the support for OPAMPD2 is included.
+ * @note    The default is @p FALSE.
+ */
+#if !defined(STM32_OPAMP_USE_OPAMP2) || defined(__DOXYGEN__)
+#define STM32_OPAMP_USE_OPAMP2                  FALSE
+#endif
+
+/**
+ * @brief   OPAMPD3 driver enable switch.
+ * @details If set to @p TRUE the support for OPAMPD3 is included.
+ * @note    The default is @p FALSE.
+ */
+#if !defined(STM32_OPAMP_USE_OPAMP3) || defined(__DOXYGEN__)
+#define STM32_OPAMP_USE_OPAMP3                  FALSE
+#endif
+
+/**
+ * @brief   OPAMPD4 driver enable switch.
+ * @details If set to @p TRUE the support for OPAMPD4 is included.
+ * @note    The default is @p FALSE.
+ */
+#if !defined(STM32_OPAMP_USE_OPAMP4) || defined(__DOXYGEN__)
+#define STM32_OPAMP_USE_OPAMP4                  FALSE
+#endif
+
+
+/** @} */
+
+/*===========================================================================*/
+/* Derived constants and error checks.                                       */
+/*===========================================================================*/
+
+
+#if STM32_OPAMP_USE_OPAMP1 && !STM32_HAS_OPAMP1
+#error "OPAMP1 not present in the selected device"
+#endif
+
+#if STM32_OPAMP_USE_OPAMP2 && !STM32_HAS_OPAMP2
+#error "OPAMP2 not present in the selected device"
+#endif
+
+#if STM32_OPAMP_USE_OPAMP3 && !STM32_HAS_OPAMP3
+#error "OPAMP3 not present in the selected device"
+#endif
+
+#if STM32_OPAMP_USE_OPAMP4 && !STM32_HAS_OPAMP4
+#error "OPAMP4 not present in the selected device"
+#endif
+
+#if !STM32_OPAMP_USE_OPAMP1 && !STM32_OPAMP_USE_OPAMP2 &&                         \
+    !STM32_OPAMP_USE_OPAMP3 && !STM32_OPAMP_USE_OPAMP4
+#error "OPAMP driver activated but no OPAMP peripheral assigned"
+#endif
+
+/*===========================================================================*/
+/* Driver data structures and types.                                         */
+/*===========================================================================*/
+
+/**
+ * @brief   Driver configuration structure.
+ * @note    It could be empty on some architectures.
+ */
+typedef struct {
+  /**
+   * @brief OPAMP CSR register initialization data.
+   * @note  The value of this field should normally be equal to zero.
+   */
+  uint32_t                  csr;
+} OPAMPConfig;
+
+/**
+ * @brief   Structure representing an OPAMP driver.
+ */
+struct OPAMPDriver {
+  /**
+   * @brief Driver state.
+   */
+  opampstate_t                state;
+  /**
+   * @brief Current configuration data.
+   */
+  const OPAMPConfig           *config;
+#if defined(OPAMP_DRIVER_EXT_FIELDS)
+  OPAMP_DRIVER_EXT_FIELDS
+#endif
+  /* End of the mandatory fields.*/
+  /**
+   * @brief Pointer to the OPAMPx registers block.
+   */
+  OPAMP_TypeDef               *reg;
+};
+
+/*===========================================================================*/
+/* Driver macros.                                                            */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* External declarations.                                                    */
+/*===========================================================================*/
+
+#if STM32_OPAMP_USE_OPAMP1 && !defined(__DOXYGEN__)
+extern OPAMPDriver OPAMPD1;
+#endif
+
+#if STM32_OPAMP_USE_OPAMP2 && !defined(__DOXYGEN__)
+extern OPAMPDriver OPAMPD2;
+#endif
+
+#if STM32_OPAMP_USE_OPAMP3 && !defined(__DOXYGEN__)
+extern OPAMPDriver OPAMPD3;
+#endif
+
+#if STM32_OPAMP_USE_OPAMP4 && !defined(__DOXYGEN__)
+extern OPAMPDriver OPAMPD4;
+#endif
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+  void opamp_lld_init(void);
+  void opamp_lld_start(OPAMPDriver *compp);
+  void opamp_lld_stop(OPAMPDriver *compp);
+  void opamp_lld_enable(OPAMPDriver *compp);
+  void opamp_lld_disable(OPAMPDriver *compp);
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* HAL_USE_OPAMP */
+
+#endif /* _opamp_lld_H_ */
+
+/** @} */
diff --git a/os/hal/ports/STM32/STM32F3xx/platform.mk b/os/hal/ports/STM32/STM32F3xx/platform.mk
index f41da95..befe229 100644
--- a/os/hal/ports/STM32/STM32F3xx/platform.mk
+++ b/os/hal/ports/STM32/STM32F3xx/platform.mk
@@ -15,6 +15,7 @@ endif
 include ${CHIBIOS_CONTRIB}/os/hal/ports/STM32/LLD/CRCv1/driver.mk
 include ${CHIBIOS_CONTRIB}/os/hal/ports/STM32/LLD/TIMv1/driver.mk
 include ${CHIBIOS_CONTRIB}/os/hal/ports/STM32/LLD/COMPv1/driver.mk
+include ${CHIBIOS_CONTRIB}/os/hal/ports/STM32/LLD/OPAMPv1/driver.mk
 
 # Shared variables
 ALLCSRC += $(PLATFORMSRC_CONTRIB)
diff --git a/os/hal/src/hal_opamp.c b/os/hal/src/hal_opamp.c
new file mode 100644
index 0000000..ba718a7
--- /dev/null
+++ b/os/hal/src/hal_opamp.c
@@ -0,0 +1,155 @@
+/*
+    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.
+*/
+
+/**
+ * @file    hal_opamp.c
+ * @brief   OPAMP Driver code.
+ *
+ * @addtogroup OPAMP
+ * @{
+ */
+
+#include "hal_opamp.h"
+
+#if HAL_USE_OPAMP || defined(__DOXYGEN__)
+
+
+/*===========================================================================*/
+/* Driver local definitions.                                                 */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver exported variables.                                                */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver local variables and types.                                         */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver local functions.                                                   */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver exported functions.                                                */
+/*===========================================================================*/
+
+/**
+ * @brief   OPAMP Driver initialization.
+ * @note    This function is implicitly invoked by @p halInit(), there is
+ *          no need to explicitly initialize the driver.
+ *
+ * @init
+ */
+void opampInit(void) {
+
+  opamp_lld_init();
+}
+
+/**
+ * @brief   Initializes the standard part of a @p OPAMPDriver structure.
+ *
+ * @param[out] opampp     pointer to the @p OPAMPDriver object
+ *
+ * @init
+ */
+void opampObjectInit(OPAMPDriver *opampp) {
+
+  opampp->state  = OPAMP_STOP;
+  opampp->config = NULL;
+}
+
+/**
+ * @brief   Configures and activates the OPAMP peripheral.
+ *
+ * @param[in] opampp      pointer to the @p OPAMPDriver object
+ * @param[in] config    pointer to the @p OPAMPConfig object
+ *
+ * @api
+ */
+void opampStart(OPAMPDriver *opampp, const OPAMPConfig *config) {
+
+  osalDbgCheck((opampp != NULL) && (config != NULL));
+
+  osalSysLock();
+  osalDbgAssert((opampp->state == OPAMP_STOP) || (opampp->state == OPAMP_READY),
+              "invalid state");
+  opampp->config = config;
+  opamp_lld_start(opampp);
+  opampp->state = OPAMP_READY;
+  osalSysUnlock();
+}
+
+/**
+ * @brief   Deactivates the OPAMP peripheral.
+ *
+ * @param[in] opampp      pointer to the @p OPAMPDriver object
+ *
+ * @api
+ */
+void opampStop(OPAMPDriver *opampp) {
+
+  osalDbgCheck(opampp != NULL);
+
+  osalSysLock();
+  osalDbgAssert((opampp->state == OPAMP_STOP) || (opampp->state == OPAMP_READY),
+              "invalid state");
+  opamp_lld_stop(opampp);
+  opampp->state = OPAMP_STOP;
+  osalSysUnlock();
+}
+
+/**
+ * @brief   Activates the opamp.
+ *
+ * @param[in] opampp      pointer to the @p OPAMPDriver object
+ *
+ * @api
+ */
+void opampEnable(OPAMPDriver *opampp) {
+
+  osalDbgCheck(opampp != NULL);
+
+  osalSysLock();
+  osalDbgAssert(opampp->state == OPAMP_READY, "invalid state");
+  opamp_lld_enable(opampp);
+  opampp->state = OPAMP_ACTIVE;
+  osalSysUnlock();
+}
+
+/**
+ * @brief   Deactivates the opamp.
+ *
+ * @param[in] opampp      pointer to the @p OPAMPDriver object
+ *
+ * @api
+ */
+void opampDisable(OPAMPDriver *opampp) {
+
+  osalDbgCheck(opampp != NULL);
+
+  osalSysLock();
+  osalDbgAssert((opampp->state == OPAMP_READY) || (opampp->state == OPAMP_ACTIVE),
+             "invalid state");
+  opamp_lld_disable(opampp);
+  opampp->state = OPAMP_READY;
+  osalSysUnlock();
+}
+
+#endif /* HAL_USE_OPAMP */
+
+/** @} */