boards/arm/samv7/same70-xplained: add support for AFEC (ADC) driver

This commit adds board level support for Analog Front End driver to
SAME70 Xplained boaed. Example application can be run via adc
configuration.

Signed-off-by: Michal Lenc <michallenc@seznam.cz>

boards/arm/samv7/same70-xplained/README.txt

@@ -1311,6 +1311,12 @@ NOTES:
 Configuration sub-directories
 -----------------------------
 
+  adc
+
+    This is a basic nsh configuration (se below) with added example for
+    ADC (AFEC) driver. Data can be read through channel AFE0_AD0 by
+    running application "adc" in NuttShell.
+
   mrf24j40-starhub
 
     This configuration implements a hub node in a 6LoWPAN start network.

boards/arm/samv7/same70-xplained/configs/adc/defconfig

@@ -0,0 +1,84 @@
+#
+# This file is autogenerated: PLEASE DO NOT EDIT IT.
+#
+# You can use "make menuconfig" to make any modifications to the installed .config file.
+# You can then do "make savedefconfig" to generate a new defconfig file that includes your
+# modifications.
+#
+# CONFIG_ARCH_RAMFUNCS is not set
+# CONFIG_MMCSD_MMCSUPPORT is not set
+# CONFIG_MMCSD_SPI is not set
+# CONFIG_SAMV7_SDRAMHEAP is not set
+# CONFIG_SAMV7_UART0 is not set
+# CONFIG_SAMV7_UART2 is not set
+# CONFIG_SAMV7_UART4 is not set
+CONFIG_ADC=y
+CONFIG_ANALOG=y
+CONFIG_ARCH="arm"
+CONFIG_ARCH_BOARD="same70-xplained"
+CONFIG_ARCH_BOARD_SAME70_XPLAINED=y
+CONFIG_ARCH_BUTTONS=y
+CONFIG_ARCH_CHIP="samv7"
+CONFIG_ARCH_CHIP_SAME70=y
+CONFIG_ARCH_CHIP_SAME70Q21=y
+CONFIG_ARCH_CHIP_SAME70Q=y
+CONFIG_ARCH_CHIP_SAMV7=y
+CONFIG_ARCH_INTERRUPTSTACK=2048
+CONFIG_ARCH_IRQBUTTONS=y
+CONFIG_ARCH_STACKDUMP=y
+CONFIG_ARMV7M_DCACHE=y
+CONFIG_ARMV7M_ICACHE=y
+CONFIG_ARMV7M_LAZYFPU=y
+CONFIG_AT24XX_ADDR=0x57
+CONFIG_AT24XX_EXTENDED=y
+CONFIG_AT24XX_EXTSIZE=160
+CONFIG_AT24XX_SIZE=2
+CONFIG_BOARD_LOOPSPERMSEC=51262
+CONFIG_BUILTIN=y
+CONFIG_EXAMPLES_ADC=y
+CONFIG_EXAMPLES_ADC_GROUPSIZE=1
+CONFIG_EXAMPLES_ADC_NSAMPLES=1000
+CONFIG_EXAMPLES_ADC_SWTRIG=y
+CONFIG_FAT_LCNAMES=y
+CONFIG_FAT_LFN=y
+CONFIG_FS_FAT=y
+CONFIG_FS_PROCFS=y
+CONFIG_I2CTOOL_MAXBUS=0
+CONFIG_MMCSD_MULTIBLOCK_DISABLE=y
+CONFIG_MMCSD_SDIO=y
+CONFIG_MTD=y
+CONFIG_MTD_AT24XX=y
+CONFIG_MTD_AT25=y
+CONFIG_MTD_CONFIG=y
+CONFIG_NSH_ARCHINIT=y
+CONFIG_NSH_BUILTIN_APPS=y
+CONFIG_NSH_FILEIOSIZE=512
+CONFIG_NSH_LINELEN=64
+CONFIG_NSH_READLINE=y
+CONFIG_PREALLOC_TIMERS=4
+CONFIG_RAM_SIZE=393216
+CONFIG_RAM_START=0x20400000
+CONFIG_RAW_BINARY=y
+CONFIG_RR_INTERVAL=200
+CONFIG_SAMV7_AFEC0=y
+CONFIG_SAMV7_GPIOA_IRQ=y
+CONFIG_SAMV7_GPIOC_IRQ=y
+CONFIG_SAMV7_GPIO_IRQ=y
+CONFIG_SAMV7_HSMCI0=y
+CONFIG_SAMV7_SDRAMC=y
+CONFIG_SAMV7_SDRAMSIZE=2097152
+CONFIG_SAMV7_TWIHS0=y
+CONFIG_SAMV7_USART1=y
+CONFIG_SAMV7_XDMAC=y
+CONFIG_SCHED_HPWORK=y
+CONFIG_SCHED_WAITPID=y
+CONFIG_SDCLONE_DISABLE=y
+CONFIG_SDIO_BLOCKSETUP=y
+CONFIG_START_DAY=10
+CONFIG_START_MONTH=3
+CONFIG_START_YEAR=2014
+CONFIG_SYSTEM_I2CTOOL=y
+CONFIG_SYSTEM_NSH=y
+CONFIG_SYSTEM_RAMTEST=y
+CONFIG_USART1_SERIAL_CONSOLE=y
+CONFIG_USER_ENTRYPOINT="nsh_main"

boards/arm/samv7/same70-xplained/src/Makefile

@@ -81,6 +81,10 @@ endif
 endif
 endif
 
+ifeq ($(CONFIG_SAMV7_AFEC),y)
+CSRCS += sam_afec.c
+endif
+
 ifneq (,$(findstring y,$(CONFIG_SAMV7_DAC0) $(CONFIG_SAMV7_DAC1)))
 CSRCS += sam_dac.c
 endif

boards/arm/samv7/same70-xplained/src/sam_afec.c

@@ -0,0 +1,121 @@
+/****************************************************************************
+ * boards/arm/samv7/same70-xplained/src/sam_afec.c
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you 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.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <errno.h>
+#include <debug.h>
+
+#include <nuttx/board.h>
+#include <nuttx/analog/adc.h>
+#include <arch/board/board.h>
+
+#include "chip.h"
+#include "arm_arch.h"
+
+#include "sam_afec.h"
+#include "same70-xplained.h"
+
+#ifdef CONFIG_SAMV7_AFEC
+
+#define ADC0_NCHANNELS 3
+#define ADC1_NCHANNELS 4
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+#ifdef CONFIG_SAMV7_AFEC0
+static const uint8_t g_chanlist0[ADC0_NCHANNELS] =
+  {
+    0, 6, 8
+  };
+#endif
+
+#ifdef CONFIG_SAMV7_AFEC1
+static const uint8_t g_chanlist1[ADC1_NCHANNELS] =
+  {
+    1, 3, 5, 6
+  };
+#endif
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: sam_afecinitialize
+ *
+ * Description:
+ *   Initialize and register the ADC driver.
+ *
+ ****************************************************************************/
+
+int sam_afec_setup(void)
+{
+  struct adc_dev_s *adc;
+  int ret;
+
+  /* Call sam_adc_initialize() to get an instance of the ADC interface */
+
+  #ifdef CONFIG_SAMV7_AFEC0
+      adc = sam_afec_initialize(0, g_chanlist0, ADC0_NCHANNELS);
+      if (adc == NULL)
+        {
+          aerr("ERROR: Failed to get ADC1 interface\n");
+          return -ENODEV;
+        }
+
+      /* Register the ADC driver at "/dev/adc0" */
+
+      ret = adc_register("/dev/adc0", adc);
+      if (ret < 0)
+        {
+          aerr("ERROR: adc_register adc0 failed: %d\n", ret);
+          return ret;
+        }
+
+  #endif
+  #ifdef CONFIG_SAMV7_AFEC1
+      adc = sam_afec_initialize(1, g_chanlist1, ADC1_NCHANNELS);
+      if (adc == NULL)
+        {
+          aerr("ERROR: Failed to get ADC2 interface\n");
+          return -ENODEV;
+        }
+
+      /* Register the ADC driver at "/dev/adc1" */
+
+      ret = adc_register("/dev/adc1", adc);
+      if (ret < 0)
+        {
+          aerr("ERROR: adc_register adc1 failed: %d\n", ret);
+          return ret;
+        }
+  #endif
+
+  return OK;
+}
+
+#endif /* CONFIG_SAMV7_AFEC */

boards/arm/samv7/same70-xplained/src/sam_bringup.c

@@ -342,6 +342,16 @@ int sam_bringup(void)
     }
 #endif
 
+#ifdef CONFIG_SAMV7_AFEC
+  /* Initialize AFEC and register the ADC driver. */
+
+  ret = sam_afec_setup();
+  if (ret < 0)
+    {
+      syslog(LOG_ERR, "ERROR: sam_afec_initialize failed: %d\n", ret);
+    }
+#endif
+
 #if defined(CONFIG_SAMV7_DAC0) || defined(CONFIG_SAMV7_DAC1)
   ret = sam_dacdev_initialize();
   if (ret < 0)

boards/arm/samv7/same70-xplained/src/same70-xplained.h

@@ -450,6 +450,18 @@ void sam_sdram_config(void);
 int sam_bringup(void);
 #endif
 
+/****************************************************************************
+ * Name: sam_afec_initialize
+ *
+ * Description:
+ *   Initialize and register the ADC driver.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_SAMV7_AFEC
+int sam_afec_setup(void);
+#endif
+
 /****************************************************************************
  * Name: sam_dacdev_initialize
  *