boards/nrf5340-dk: add ADC configuration

boards/arm/nrf53/nrf5340-dk/configs/adc_cpuapp/defconfig

@@ -0,0 +1,52 @@
+#
+# 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_NSH_DISABLE_IFCONFIG is not set
+# CONFIG_NSH_DISABLE_PS is not set
+# CONFIG_STANDARD_SERIAL is not set
+CONFIG_ADC=y
+CONFIG_ANALOG=y
+CONFIG_ARCH="arm"
+CONFIG_ARCH_BOARD="nrf5340-dk"
+CONFIG_ARCH_BOARD_NRF5340_DK=y
+CONFIG_ARCH_CHIP="nrf53"
+CONFIG_ARCH_CHIP_NRF5340=y
+CONFIG_ARCH_CHIP_NRF5340_CPUAPP=y
+CONFIG_ARCH_CHIP_NRF53=y
+CONFIG_ARCH_STACKDUMP=y
+CONFIG_ARCH_STDARG_H=y
+CONFIG_BOARD_LOOPSPERMSEC=5500
+CONFIG_BUILTIN=y
+CONFIG_EXAMPLES_ADC=y
+CONFIG_EXAMPLES_ADC_NSAMPLES=4
+CONFIG_EXAMPLES_ADC_SWTRIG=y
+CONFIG_EXPERIMENTAL=y
+CONFIG_FAT_LCNAMES=y
+CONFIG_FAT_LFN=y
+CONFIG_FS_FAT=y
+CONFIG_INIT_ENTRYPOINT="nsh_main"
+CONFIG_INTELHEX_BINARY=y
+CONFIG_MM_REGIONS=2
+CONFIG_NRF53_SAADC=y
+CONFIG_NRF53_UART0=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=524288
+CONFIG_RAM_START=0x20000000
+CONFIG_RAW_BINARY=y
+CONFIG_RR_INTERVAL=200
+CONFIG_SCHED_WAITPID=y
+CONFIG_START_DAY=26
+CONFIG_START_MONTH=3
+CONFIG_SYMTAB_ORDEREDBYNAME=y
+CONFIG_SYSTEM_NSH=y
+CONFIG_TASK_NAME_SIZE=0
+CONFIG_UART0_SERIAL_CONSOLE=y

boards/arm/nrf53/nrf5340-dk/include/board.h

@@ -141,4 +141,18 @@
 #define NRF53_PWM0_CH2_PIN (GPIO_MCUSEL_APP | GPIO_OUTPUT | GPIO_PORT1 | GPIO_PIN(12))
 #define NRF53_PWM0_CH3_PIN (GPIO_MCUSEL_APP | GPIO_OUTPUT | GPIO_PORT1 | GPIO_PIN(13))
 
+/* ADC Pins *****************************************************************/
+
+/* ADC
+ *   ADC CH0 - P0.04 - AIN1
+ *   ADC CH1 - P0.05 - AIN2
+ *   ADC CH2 - P0.06 - AIN4
+ *   ADC CH3 - P0.07 - AIN5
+ */
+
+#define NRF53_ADC_CH0_PIN (GPIO_MCUSEL_APP | GPIO_INPUT | GPIO_PORT0 | GPIO_PIN(4))
+#define NRF53_ADC_CH1_PIN (GPIO_MCUSEL_APP | GPIO_INPUT | GPIO_PORT0 | GPIO_PIN(5))
+#define NRF53_ADC_CH2_PIN (GPIO_MCUSEL_APP | GPIO_INPUT | GPIO_PORT0 | GPIO_PIN(6))
+#define NRF53_ADC_CH3_PIN (GPIO_MCUSEL_APP | GPIO_INPUT | GPIO_PORT0 | GPIO_PIN(7))
+
 #endif /* __BOARDS_ARM_NRF53_NRF5340_DK_INCLUDE_BOARD_H */

boards/arm/nrf53/nrf5340-dk/src/Makefile

@@ -46,4 +46,8 @@ ifeq ($(CONFIG_PWM),y)
 CSRCS += nrf53_pwm.c
 endif
 
+ifeq ($(CONFIG_ADC),y)
+CSRCS += nrf53_adc.c
+endif
+
 include $(TOPDIR)/boards/Board.mk

boards/arm/nrf53/nrf5340-dk/src/nrf5340-dk.h

@@ -106,5 +106,17 @@ int nrf53_timer_driver_setup(const char *devpath, int timer);
 int nrf53_pwm_setup(void);
 #endif
 
+/****************************************************************************
+ * Name: nrf53_adc_setup
+ *
+ * Description:
+ *   Initialize ADC driver.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_ADC
+int nrf53_adc_setup(void);
+#endif
+
 #endif /* __ASSEMBLY__ */
 #endif /* __BOARDS_ARM_NRF53_NRF5340_DK_SRC_NRF53_NRF5340_DK_H */

boards/arm/nrf53/nrf5340-dk/src/nrf53_adc.c

@@ -0,0 +1,200 @@
+/****************************************************************************
+ * boards/arm/nrf53/nrf5340-dk/src/nrf53_adc.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 <stdint.h>
+#include <errno.h>
+#include <debug.h>
+
+#include <nuttx/analog/adc.h>
+#include <arch/board/board.h>
+
+#include "nrf53_gpio.h"
+#include "nrf53_adc.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/* Only one channel supported if TIMER triger enabled */
+
+#ifdef CONFIG_NRF53_SAADC_TIMER
+#  define ADC_NCHANNELS (1)
+#else
+#  define ADC_NCHANNELS (4)
+#endif
+
+/****************************************************************************
+ * Private data
+ ****************************************************************************/
+
+/* ADC pins configuration */
+
+static uint32_t g_adc_pins[ADC_NCHANNELS] =
+{
+  NRF53_ADC_CH0_PIN,            /* AIN1 */
+#if (ADC_NCHANNELS == 4)
+  NRF53_ADC_CH1_PIN,            /* AIN2 */
+  NRF53_ADC_CH2_PIN,            /* AIN4 */
+  NRF53_ADC_CH3_PIN,            /* AIN5 */
+#endif
+};
+
+/* ADC channels configuration */
+
+static struct nrf53_adc_channel_s g_adc_chanlist[ADC_NCHANNELS] =
+{
+  /* Channel 0 */
+
+  {
+    .p_psel  = NRF53_ADC_IN_IN1,
+    .n_psel  = 0,
+#ifdef CONFIG_NRF53_SAADC_LIMITS
+    .limith = 0,
+    .limitl = 0,
+#endif
+    .resp   = NRF53_ADC_RES_BYPASS,
+    .resn   = NRF53_ADC_RES_BYPASS,
+    .gain   = NRF53_ADC_GAIN_1,
+    .refsel = NRF53_ADC_REFSEL_INTERNAL,
+    .tacq   = NRF53_ADC_TACQ_40US,
+    .mode   = NRF53_ADC_MODE_SE,
+    .burst  = NRF53_ADC_BURST_DISABLE,
+  },
+
+#if (ADC_NCHANNELS == 4)
+  /* Channel 1 */
+
+  {
+    .p_psel  = NRF53_ADC_IN_IN2,
+    .n_psel  = 0,
+#ifdef CONFIG_NRF53_SAADC_LIMITS
+    .limith = 0,
+    .limitl = 0,
+#endif
+    .resp   = NRF53_ADC_RES_BYPASS,
+    .resn   = NRF53_ADC_RES_BYPASS,
+    .gain   = NRF53_ADC_GAIN_1,
+    .refsel = NRF53_ADC_REFSEL_INTERNAL,
+    .tacq   = NRF53_ADC_TACQ_40US,
+    .mode   = NRF53_ADC_MODE_SE,
+    .burst  = NRF53_ADC_BURST_DISABLE,
+  },
+
+  /* Channel 2 */
+
+  {
+    .p_psel  = NRF53_ADC_IN_IN4,
+    .n_psel  = 0,
+#ifdef CONFIG_NRF53_SAADC_LIMITS
+    .limith = 0,
+    .limitl = 0,
+#endif
+    .resp   = NRF53_ADC_RES_BYPASS,
+    .resn   = NRF53_ADC_RES_BYPASS,
+    .gain   = NRF53_ADC_GAIN_1,
+    .refsel = NRF53_ADC_REFSEL_INTERNAL,
+    .tacq   = NRF53_ADC_TACQ_40US,
+    .mode   = NRF53_ADC_MODE_SE,
+    .burst  = NRF53_ADC_BURST_DISABLE,
+  },
+
+  /* Channel 3 */
+
+  {
+    .p_psel  = NRF53_ADC_IN_IN5,
+    .n_psel  = 0,
+#ifdef CONFIG_NRF53_SAADC_LIMITS
+    .limith = 0,
+    .limitl = 0,
+#endif
+    .resp   = NRF53_ADC_RES_BYPASS,
+    .resn   = NRF53_ADC_RES_BYPASS,
+    .gain   = NRF53_ADC_GAIN_1,
+    .refsel = NRF53_ADC_REFSEL_INTERNAL,
+    .tacq   = NRF53_ADC_TACQ_40US,
+    .mode   = NRF53_ADC_MODE_SE,
+    .burst  = NRF53_ADC_BURST_DISABLE,
+  }
+#endif
+};
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: nrf53_adc_setup
+ *
+ * Description:
+ *   Initialize ADC and register the ADC device.
+ *
+ ****************************************************************************/
+
+int nrf53_adc_setup(void)
+{
+  static bool       initialized = false;
+  struct adc_dev_s *adc         = NULL;
+  int               ret         = OK;
+  int               i           = 0;
+
+  /* Have we already initialized? */
+
+  if (!initialized)
+    {
+      /* Configure ADC pins */
+
+      for (i = 0; i < ADC_NCHANNELS; i += 1)
+        {
+          nrf53_gpio_config(g_adc_pins[i]);
+        }
+
+      /* Call nrf53_adcinitialize() to get an instance of the ADC interface */
+
+      adc = nrf53_adcinitialize(g_adc_chanlist, ADC_NCHANNELS);
+      if (!adc)
+        {
+          aerr("ERROR: Failed to get the NRF53 ADC lower half\n");
+          ret = -ENODEV;
+          goto errout;
+        }
+
+      /* Register the ADC driver at "/dev/adc0" */
+
+      ret = adc_register("/dev/adc0", adc);
+      if (ret < 0)
+        {
+          aerr("ERROR: adc_register failed: %d\n", ret);
+          goto errout;
+        }
+
+      /* Now we are initialized */
+
+      initialized = true;
+    }
+
+errout:
+  return ret;
+}

boards/arm/nrf53/nrf5340-dk/src/nrf53_bringup.c

@@ -111,6 +111,18 @@ int nrf53_bringup(void)
     }
 #endif
 
+#ifdef CONFIG_ADC
+  /* Configure ADC driver */
+
+  ret = nrf53_adc_setup();
+  if (ret < 0)
+    {
+      syslog(LOG_ERR,
+             "ERROR: Failed to initialize ADC driver: %d\n",
+             ret);
+    }
+#endif
+
 #ifdef CONFIG_NRF53_SOFTDEVICE_CONTROLLER
   ret = nrf53_sdc_initialize();