Add support for SAMV7 DACC module

configs/same70-xplained/src/Makefile

@@ -90,4 +90,8 @@ endif
 endif
 endif
 
+ifneq (,$(findstring y,$(CONFIG_SAMV7_DAC0) $(CONFIG_SAMV7_DAC1)))
+CSRCS += sam_dac.c
+endif
+
 include $(TOPDIR)/configs/Board.mk

configs/same70-xplained/src/sam_bringup.c

@@ -329,6 +329,14 @@ int sam_bringup(void)
     }
 #endif
 
+#if defined(CONFIG_SAMV7_DAC0) || defined(CONFIG_SAMV7_DAC1)
+  ret = sam_dacdev_initialize();
+  if (ret < 0)
+    {
+      _err("ERROR: Initialization of the DAC module failed: %d\n", ret);
+    }
+#endif
+
   /* If we got here then perhaps not all initialization was successful, but
    * at least enough succeeded to bring-up NSH with perhaps reduced
    * capabilities.

configs/same70-xplained/src/sam_dac.c

@@ -0,0 +1,123 @@
+/************************************************************************************
+ * configs/same70-xplained/src/sam_dac.c
+ *
+ *   Copyright (C) 2016 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * 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 <debug.h>
+#include <errno.h>
+
+#include <arch/board/board.h>
+
+#include "up_arch.h"
+#include "chip.h"
+#include "sam_dac.h"
+#include "same70-xplained.h"
+
+#if defined(CONFIG_SAMV7_DAC0) || defined(CONFIG_SAMV7_DAC1)
+
+/************************************************************************************
+ * Public Functions
+ ************************************************************************************/
+
+/************************************************************************************
+ * Name: sam_dacdev_initialize
+ *
+ * Description:
+ *   Called to configure DAC peripheral module and register DAC device driver
+ ************************************************************************************/
+
+int sam_dacdev_initialize(void)
+{
+    static bool initialized = false;
+    struct dac_dev_s *dac;
+    int ret;
+
+    /* Check if we have already initialized */
+
+    if (!initialized)
+      {
+#ifdef CONFIG_SAMV7_DAC0
+        /* Get an instance of the DAC0 interface */
+
+        dac = sam_dac_initialize(0);
+        if (dac == NULL)
+          {
+            aerr("ERROR:  Failed to get DAC0 interface\n");
+            return -ENODEV;
+          }
+
+        /* Register the DAC driver at "/dev/dac0" */
+
+        ret = dac_register("/dev/dac0", dac);
+        if (ret < 0)
+          {
+            aerr("ERROR: dac_register failed: %d\n", ret);
+            return ret;
+          }
+#endif
+
+#ifdef CONFIG_SAMV7_DAC1
+        /* Get an instance of the DAC1 interface */
+
+        dac = sam_dac_initialize(1);
+        if (dac == NULL)
+          {
+            aerr("ERROR:  Failed to get DAC1 interface\n");
+            return -ENODEV;
+          }
+
+        /* Register the DAC driver at "/dev/dac1" */
+
+        ret = dac_register("/dev/dac1", dac);
+        if (ret < 0)
+          {
+            aerr("ERROR: dac_register failed: %d\n", ret);
+            return ret;
+          }
+#endif
+        /* Now we are initialized */
+
+        initialized = true;
+      }
+    return OK;
+}
+
+#endif /* CONFIG_SAMV7_DAC0 || CONFIG_SAMV7_DAC1 */

configs/same70-xplained/src/same70-xplained.h

@@ -349,6 +349,18 @@ void sam_sdram_config(void);
 int sam_bringup(void);
 #endif
 
+/************************************************************************************
+ * Name: sam_dacdev_initialize
+ *
+ * Description:
+ *   Called to configure DAC peripheral module
+ *
+ ************************************************************************************/
+
+#if defined(CONFIG_SAMV7_DAC0) || defined(CONFIG_SAMV7_DAC1)
+int sam_dacdev_initialize(void);
+#endif
+
 /************************************************************************************
  * Name: sam_spidev_initialize
  *