boards/thingy53: add ADC support

add ADC support for thingy53

Signed-off-by: raiden00pl <raiden00@railab.me>

boards/arm/nrf53/thingy53/src/CMakeLists.txt

@@ -50,6 +50,10 @@ if(CONFIG_RGBLED)
   list(APPEND SRCS nrf53_rgbled.c)
 endif()
 
+if(CONFIG_ADC)
+  list(APPEND SRCS nrf53_adc.c)
+endif()
+
 target_sources(board PRIVATE ${SRCS})
 
 if(CONFIG_ARCH_BOARD_COMMON)

boards/arm/nrf53/thingy53/src/Make.defs

@@ -52,6 +52,10 @@ ifeq ($(CONFIG_RGBLED),y)
 CSRCS += nrf53_rgbled.c
 endif
 
+ifeq ($(CONFIG_ADC),y)
+CSRCS += nrf53_adc.c
+endif
+
 DEPPATH += --dep-path board
 VPATH += :board
 CFLAGS += ${INCDIR_PREFIX}$(TOPDIR)$(DELIM)arch$(DELIM)$(CONFIG_ARCH)$(DELIM)src$(DELIM)board$(DELIM)board

boards/arm/nrf53/thingy53/src/nrf53_adc.c

@@ -0,0 +1,146 @@
+/****************************************************************************
+ * boards/arm/nrf53/thingy53/src/nrf53_adc.c
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * 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"
+
+#include "thingy53.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/* Only one channel supported if TIMER trigger enabled */
+
+#define ADC_NCHANNELS (1)
+
+/****************************************************************************
+ * Private data
+ ****************************************************************************/
+
+/* ADC pins configuration */
+
+static uint32_t g_adc_pins[ADC_NCHANNELS] =
+{
+  NRF53_ADC_CH0_PIN,            /* AIN2 */
+};
+
+/* ADC channels configuration */
+
+static struct nrf53_adc_channel_s g_adc_chanlist[ADC_NCHANNELS] =
+{
+  /* Channel 0 */
+
+  {
+    .p_psel  = NRF53_ADC_IN_IN2,         /* AIN2 / P0.06 - BAT_MEAS */
+    .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,
+  },
+};
+
+/****************************************************************************
+ * 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;
+
+  /* Enable battery measurement.
+   * TODO: this should be controlled by power management logic
+   */
+
+  nrf53_gpio_config(GPIO_BATT_EN);
+  nrf53_gpio_write(GPIO_BATT_EN, true);
+
+  /* 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/thingy53/src/nrf53_bringup.c

@@ -211,6 +211,7 @@ int nrf53_bringup(void)
 
 #if defined(CONFIG_RNDIS) && !defined(CONFIG_RNDIS_COMPOSITE)
   uint8_t mac[6];
+
   mac[0] = 0xa0; /* TODO */
   mac[1] = (CONFIG_NETINIT_MACADDR_2 >> (8 * 0)) & 0xff;
   mac[2] = (CONFIG_NETINIT_MACADDR_1 >> (8 * 3)) & 0xff;
@@ -248,6 +249,18 @@ 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
+
   /* Initialize on-board sensors */
 
   ret = nrf53_sensors_init();

boards/arm/nrf53/thingy53/src/thingy53.h

@@ -217,5 +217,17 @@ int nrf53_i2ctool(void);
 void nrf53_spidev_initialize(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_THINGY53_SRC_THINGY53_H */