SAMDL: Added Analog Comparator headers and basic initialization

arch/arm/src/samdl/Make.defs

@@ -106,3 +106,7 @@ endif
 ifeq ($(CONFIG_SAMDL_EIC),y)
 CHIP_CSRCS += sam_eic.c
 endif
+
+ifeq ($(CONFIG_SAMDL_AC),y)
+CHIP_CSRCS += sam_ac.c
+endif

arch/arm/src/samdl/chip/samd_ac.h

+/********************************************************************************************
+ * arch/arm/src/samdl/chip/samd_ac.h
+ *
+ *   Copyright (C) 2018 Gregory Nutt. All rights reserved.
+ *   Author: Matt Thompson <matt@extent3d.com>
+ *
+ * References:
+ *   "Atmel SAM L21E / SAM L21G / SAM L21J Smart ARM-Based Microcontroller
+ *   Datasheet", Atmel-42385C-SAML21_Datasheet_Preliminary-03/20/15
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ********************************************************************************************/
+
+#ifndef __ARCH_ARM_SRC_SAMDL_CHIP_SAMD_AC_H
+#define __ARCH_ARM_SRC_SAMDL_CHIP_SAMD_AC_H
+
+/********************************************************************************************
+ * Included Files
+ ********************************************************************************************/
+
+#include <nuttx/config.h>
+
+#include "chip.h"
+
+#ifdef CONFIG_ARCH_FAMILY_SAMD21
+
+/********************************************************************************************
+ * Pre-processor Definitions
+ ********************************************************************************************/
+/* AC register offsets **********************************************************************/
+
+#define SAM_AC_CTRLA_OFFSET          0x0000 /* Control A Register */
+#define SAM_AC_CTRLB_OFFSET          0x0001 /* Control B Register */
+#define SAM_AC_EVCTRL_OFFSET         0x0002 /* Event Control Register */
+#define SAM_AC_INTENCLR_OFFSET       0x0004 /* Interrupt Enable Clear Register */
+#define SAM_AC_INTENSET_OFFSET       0x0005 /* Interrupt Enable Set Register */
+#define SAM_AC_INTFLAG_OFFSET        0x0006 /* Interrupt Flag Status and Clear Register */
+#define SAM_AC_STATUSA_OFFSET        0x0008 /* Status A Register */
+#define SAM_AC_STATUSB_OFFSET        0x0009 /* Status B Register */
+#define SAM_AC_STATUSC_OFFSET        0x000A /* Status C Register */
+#define SAM_AC_WINCTRL_OFFSET        0x000C /* Window Control Register */
+#define SAM_AC_COMPCTRL0_OFFSET      0x0010 /* Comparator 0 Control Register */
+#define SAM_AC_COMPCTRL1_OFFSET      0x0014 /* Comparator 1 Control Register */
+#define SAM_AC_SCALER0_OFFSET        0x0020 /* Scaler 0 Register */
+#define SAM_AC_SCALER1_OFFSET        0x0021 /* Scaler 1 Register */
+
+/* AC register addresses *******************************************************************/
+
+#define SAM_AC_CTRLA                 (SAM_AC_BASE+SAM_AC_CTRLA_OFFSET)
+#define SAM_AC_CTRLB                 (SAM_AC_BASE+SAM_AC_CTRLB_OFFSET)
+#define SAM_AC_EVCTRL                (SAM_AC_BASE+SAM_AC_EVCTRL_OFFSET)
+#define SAM_AC_INTENCLR              (SAM_AC_BASE+SAM_AC_INTENCLR_OFFSET)
+#define SAM_AC_INTENSET              (SAM_AC_BASE+SAM_AC_INTENSET_OFFSET)
+#define SAM_AC_INTFLAG               (SAM_AC_BASE+SAM_AC_INTFLAG_OFFSET)
+#define SAM_AC_STATUSA               (SAM_AC_BASE+SAM_AC_STATUSA_OFFSET)
+#define SAM_AC_STATUSB               (SAM_AC_BASE+SAM_AC_STATUSB_OFFSET)
+#define SAM_AC_STATUSC               (SAM_AC_BASE+SAM_AC_STATUSC_OFFSET)
+#define SAM_AC_WINCTRL               (SAM_AC_BASE+SAM_AC_WINCTRL_OFFSET)
+#define SAM_AC_COMPCTRL0             (SAM_AC_BASE+SAM_AC_COMPCTRL0_OFFSET)
+#define SAM_AC_COMPCTRL1             (SAM_AC_BASE+SAM_AC_COMPCTRL1_OFFSET)
+#define SAM_AC_SCALER0               (SAM_AC_BASE+SAM_AC_SCALER0_OFFSET)
+#define SAM_AC_SCALER1               (SAM_AC_BASE+SAM_AC_SCALER1_OFFSET)
+
+/* AC register bit definitions ************************************************************/
+
+/* Control A Register */
+
+#define AC_CTRLA_SWRTS               (1 << 0)  /* Bit 0:  Software reset */
+#define AC_CTRLA_ENABLE              (1 << 1)  /* Bit 1:  Enable AC */
+#define AC_CTRLA_RUNSTDBY            (1 << 2)  /* Bit 2:  Run in standby */
+#define AC_CTRLA_LPMUX               (1 << 7)  /* Bit 7:  Low-Power Mux */
+
+/* Control B Register */
+
+#define AC_CTRLB_START0              (1 << 0)  /* Bit 0:  Comparator 0 start */
+#define AC_CTRLB_START1              (1 << 1)  /* Bit 1:  Comparator 1 start */
+
+/* Event Control Register */
+
+#define AC_EVCTRL_COMPEO0            (1 << 0)  /* Bit 0:  Comparator 0 Event Output enable */
+#define AC_EVCTRL_COMPEO1            (1 << 1)  /* Bit 1:  Comparator 1 Event Output enable */
+#define AC_EVCTRL_WINEO0             (1 << 4)  /* Bit 4:  Window 0 Event Output enable */
+#define AC_EVCTRL_COMPEI0            (1 << 8)  /* Bit 8:  Comparator 0 Event Input enable */
+#define AC_EVCTRL_COMPEI1            (1 << 9)  /* Bit 9:  Comparator 1 Event Input enable */
+
+/* Common bit definitions for Interrupt Enable Clear Register, Interrupt Enable Set
+ * Register, and Interrupt Flag Status and Clear Register
+ */
+
+#define AC_INT_COMP0                 (1 << 0)  /* Bit 0:  Comparator 0 */
+#define AC_INT_COMP1                 (1 << 1)  /* Bit 1:  Comparator 1 */
+#define AC_INT_WIN0                  (1 << 4)  /* Bit 4:  Window 0 */
+#define AC_INT_ALL                   0x13
+
+/* Status A Register */
+
+#define AC_STATUSA_STATE0            (1 << 0)  /* Bit 0:  State 0 - Output state of comparator 0 */
+#define AC_STATUSA_STATE1            (1 << 1)  /* Bit 1:  State 1 - Output state of comparator 1 */
+#define AC_STATUSA_WSTATE_SHIFT      (4)
+#define AC_STATUSA_WSTATE_MASK       (3 << AC_STATUSA_WSTATE_SHIFT)
+#  define AC_STATUSA_WSTATE_ABOVE    (0 << AC_STATUSA_WSTATE_SHIFT)
+#  define AC_STATUSA_WSTATE_INSIDE   (1 << AC_STATUSA_WSTATE_SHIFT)
+#  define AC_STATUSA_WSTATE_BELOW    (2 << AC_STATUSA_WSTATE_SHIFT)
+
+/* Status B Register */
+
+#define AC_STATUSB_READY0            (1 << 0)  /* Bit 0:  Ready 0 - Comparator 0 ready status */
+#define AC_STATUSB_READY1            (1 << 1)  /* Bit 1:  Ready 1 - Comparator 1 ready status */
+#define AC_STATUSB_SYNCBUSY          (1 << 7)  /* Bit 7:  Synchronoziation ready */
+
+/* Status C Register */
+
+/* Window Control Register */
+
+#define AC_WINCTRL_WEN0              (1 << 0)  /* Bit 0:  Window enable (both comparators) */
+#define AC_WINCTRL_WINTSEL_SHIFT     (1)
+#define AC_WINCTRL_WINTSEL_MASK      (3 << AC_WINCTRL_WINTSEL_SHIFT)
+#  define AC_WINCTRL_WINTSEL_ABOVE   (0 << AC_WINCTRL_WINTSEL_SHIFT)
+#  define AC_WINCTRL_WINTSEL_INSIDE  (1 << AC_WINCTRL_WINTSEL_SHIFT)
+#  define AC_WINCTRL_WINTSEL_BELOW   (2 << AC_WINCTRL_WINTSEL_SHIFT)
+#  define AC_WINCTRL_WINTSEL_OUTSIDE (3 << AC_WINCTRL_WINTSEL_SHIFT)
+
+/* Comparator Control Registers */
+
+#define AC_COMPCTRL_ENABLE           (1 << 0)  /* Bit 0:  Enable Comparator */
+#define AC_COMPCTRL_SINGLE           (1 << 1)  /* Bit 1:  Single Shot Mode */
+#define AC_COMPCTRL_SPEED_SHIFT      (2)
+#define AC_COMPCTRL_SPEED_MASK       (3 << AC_COMPCTRL_SPEED_SHIFT)
+#  define AC_COMPCTRL_SPEED_LOW      (0 << AC_COMPCTRL_SPEED_SHIFT)
+#  define AC_COMPCTRL_SPEED_HIGH     (1 << AC_COMPCTRL_SPEED_SHIFT)
+#define AC_COMPCTRL_INTSEL_SHIFT     (5)
+#define AC_COMPCTRL_INTSEL_MASK      (3 << AC_COMPCTRL_INTSEL_SHIFT)
+#  define AC_COMPCTRL_INTSEL_TOGGLE  (0 << AC_COMPCTRL_INTSEL_SHIFT)
+#  define AC_COMPCTRL_INTSEL_RISING  (1 << AC_COMPCTRL_INTSEL_SHIFT)
+#  define AC_COMPCTRL_INTSEL_FALLING (2 << AC_COMPCTRL_INTSEL_SHIFT)
+#  define AC_COMPCTRL_INTSEL_EOC     (3 << AC_COMPCTRL_INTSEL_SHIFT)
+#define AC_COMPCTRL_MUXNEG_SHIFT     (8)
+#define AC_COMPCTRL_MUXNEG_MASK      (7 << AC_COMPCTRL_MUXNEG_SHIFT)
+#  define AC_COMPCTRL_MUXNEG_PIN0    (0 << AC_COMPCTRL_MUXNEG_SHIFT)
+#  define AC_COMPCTRL_MUXNEG_PIN1    (1 << AC_COMPCTRL_MUXNEG_SHIFT)
+#  define AC_COMPCTRL_MUXNEG_PIN2    (2 << AC_COMPCTRL_MUXNEG_SHIFT)
+#  define AC_COMPCTRL_MUXNEG_PIN3    (3 << AC_COMPCTRL_MUXNEG_SHIFT)
+#  define AC_COMPCTRL_MUXNEG_GND     (4 << AC_COMPCTRL_MUXNEG_SHIFT)
+#  define AC_COMPCTRL_MUXNEG_VSCALE  (5 << AC_COMPCTRL_MUXNEG_SHIFT)
+#  define AC_COMPCTRL_MUXNEG_BANDGAP (6 << AC_COMPCTRL_MUXNEG_SHIFT)
+#  define AC_COMPCTRL_MUXNEG_DAC     (7 << AC_COMPCTRL_MUXNEG_SHIFT)
+#define AC_COMPCTRL_MUXPOS_SHIFT     (12)
+#define AC_COMPCTRL_MUXPOS_MASK      (3 << AC_COMPCTRL_MUXPOS_SHIFT)
+#  define AC_COMPCTRL_MUXPOS_PIN0    (0 << AC_COMPCTRL_MUXPOS_SHIFT)
+#  define AC_COMPCTRL_MUXPOS_PIN1    (1 << AC_COMPCTRL_MUXPOS_SHIFT)
+#  define AC_COMPCTRL_MUXPOS_PIN2    (2 << AC_COMPCTRL_MUXPOS_SHIFT)
+#  define AC_COMPCTRL_MUXPOS_PIN3    (3 << AC_COMPCTRL_MUXPOS_SHIFT)
+#define AC_COMPCTRL_SWAP             (1 << 13)  /* Bit 13:  Swap Inputs and Invert */
+#define AC_COMPCTRL_OUT_SHIFT        (16)
+#define AC_COMPCTRL_OUT_MASK         (3 << AC_COMPCTRL_OUT_SHIFT)
+#  define AC_COMPCTRL_OUT_OFF        (0 << AC_COMPCTRL_OUT_SHIFT)
+#  define AC_COMPCTRL_OUT_ASYNC      (1 << AC_COMPCTRL_OUT_SHIFT)
+#  define AC_COMPCTRL_OUT_SYNC       (2 << AC_COMPCTRL_OUT_SHIFT)
+#define AC_COMPCTRL_HYST             (1 << 19)  /* Bit 19:  Hysteresis Enable */
+#define AC_COMPCTRL_FLEN_SHIFT       (24)
+#define AC_COMPCTRL_FLEN_MASK        (7 << AC_COMPCTRL_FLEN_SHIFT)
+#  define AC_COMPCTRL_FLEN_OFF       (0 << AC_COMPCTRL_FLEN_SHIFT)
+#  define AC_COMPCTRL_FLEN_MAJ3      (1 << AC_COMPCTRL_FLEN_SHIFT)
+#  define AC_COMPCTRL_FLEN_MAJ5      (2 << AC_COMPCTRL_FLEN_SHIFT)
+
+/* Scaler Registers */
+
+#define AC_COMPCTRL_SCALER_MASK      (0x3f)
+
+/********************************************************************************************
+ * Public Types
+ ********************************************************************************************/
+
+/********************************************************************************************
+ * Public Data
+ ********************************************************************************************/
+
+/********************************************************************************************
+ * Public Functions
+ ********************************************************************************************/
+
+#endif /* CONFIG_ARCH_FAMILY_SAMD21 */
+#endif /* __ARCH_ARM_SRC_SAMDL_CHIP_SAMD_AC_H */

arch/arm/src/samdl/sam_ac.c

+/****************************************************************************
+ * arch/arm/src/samdl/sam_ac.c
+ *
+ *   Copyright (C) 2018 Gregory Nutt. All rights reserved.
+ *   Author: Matt Thompson <matt@extent3d.com>
+ *
+ * References:
+ *   1. "Microchip SAM D21E / SAM D21G / SAM D21J Datasheet"
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <assert.h>
+#include <errno.h>
+
+#include "up_arch.h"
+
+#include "sam_config.h"
+
+#include "sam_pm.h"
+#include "sam_gclk.h"
+#include "sam_periphclks.h"
+#include "sam_ac.h"
+#include "sam_port.h"
+
+#include <nuttx/irq.h>
+#include <nuttx/arch.h>
+#include <arch/irq.h>
+
+#include <arch/board/board.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+static int sam_ac_isr(int irq, FAR void *context, FAR void *arg)
+{
+  return OK;
+}
+
+static void sam_ac_syncwait(void)
+{
+  while ((getreg8(SAM_AC_STATUSB) & AC_STATUSB_SYNCBUSY) != 0);
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: sam_ac_initialize
+ *
+ * Description:
+ *   Initialize the Analog Comparator (AC).
+ *
+ * Input Parameters:
+ *   gclkgen - GCLK Generator
+ *
+ * Returned Value:
+ *   None
+ *
+ ****************************************************************************/
+
+int sam_ac_initialize(uint8_t gclkgen)
+{
+  uint16_t regval;
+
+  sam_ac_enableperiph();
+
+  /* The Analog Comparators use two GCLKs */
+
+  /* Enable comparator digital GCLK which provides the sampling rate */
+
+  regval = GCLK_CLKCTRL_ID_ACDIG | GCLK_CLKCTRL_GEN(gclkgen) | GCLK_CLKCTRL_CLKEN;
+  putreg16(regval, SAM_GCLK_CLKCTRL);
+
+  /* Enable comparator analog GCLK */
+
+  regval = GCLK_CLKCTRL_ID_ACANA | GCLK_CLKCTRL_GEN(gclkgen) | GCLK_CLKCTRL_CLKEN;
+  putreg16(regval, SAM_GCLK_CLKCTRL);
+
+  putreg8(AC_CTRLA_ENABLE, SAM_AC_CTRLA);
+  sam_ac_syncwait();
+
+  irq_attach(SAM_IRQ_AC, sam_ac_isr, NULL);
+
+  up_enable_irq(SAM_IRQ_AC);
+
+  return OK;
+}
+
+int sam_ac_config(uint8_t channel, uint32_t compctrl)
+{
+  switch(channel)
+    {
+      case 0:
+        putreg32(compctrl, SAM_AC_COMPCTRL0);
+        break;
+      case 1:
+        putreg32(compctrl, SAM_AC_COMPCTRL1);
+        break;
+      default:
+        return -ENODEV;
+    }
+
+  sam_ac_syncwait();
+
+  return OK;
+}
+
+int sam_ac_enable(uint8_t channel, bool enable)
+{
+  uint32_t regval;
+  switch(channel)
+    {
+      case 0:
+        regval = getreg32(SAM_AC_COMPCTRL0);
+        if(enable == true)
+          regval |= AC_COMPCTRL_ENABLE;
+        else
+          regval &= ~AC_COMPCTRL_ENABLE;
+        putreg32(regval, SAM_AC_COMPCTRL0);
+        break;
+      case 1:
+        regval = getreg32(SAM_AC_COMPCTRL1);
+        if(enable == true)
+          regval |= AC_COMPCTRL_ENABLE;
+        else
+          regval &= ~AC_COMPCTRL_ENABLE;
+        putreg32(regval, SAM_AC_COMPCTRL1);
+        break;
+      default:
+        return -ENODEV;
+    }
+
+  sam_ac_syncwait();
+
+  return OK;
+}

arch/arm/src/samdl/sam_ac.h

+/****************************************************************************
+ * arch/arm/src/samdl/sam_ac.h
+ *
+ *   Copyright (C) 2018 Gregory Nutt. All rights reserved.
+ *   Author: Matt Thompson <matt@extent3d.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+#ifndef __ARCH_ARM_SRC_SAMDL_SAM_AC_H
+#define __ARCH_ARM_SRC_SAMDL_SAM_AC_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#include "sam_config.h"
+#include "sam_port.h"
+
+#if defined(CONFIG_ARCH_FAMILY_SAMD20) || defined(CONFIG_ARCH_FAMILY_SAMD21)
+#  include "chip/samd_ac.h"
+#elif defined(CONFIG_ARCH_FAMILY_SAML21)
+#  include "chip/saml_ac.h"
+#else
+#  error Unrecognized SAMD/L architecture
+#endif
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+int sam_ac_initialize(uint8_t gclkgen);
+int sam_ac_config(uint8_t channel, uint32_t compctrl);
+int sam_ac_enable(uint8_t channel, bool enable);
+
+#undef EXTERN
+#if defined(__cplusplus)
+#define EXTERN extern "C"
+extern "C"
+{
+#else
+#define EXTERN extern
+#endif
+
+
+#undef EXTERN
+#if defined(__cplusplus)
+}
+#endif
+#endif /* __ARCH_ARM_SRC_SAMDL_SAM_AC_H */