stm32f103-minimum: Add ADC support on stm32f103-minimum board

configs/stm32f103-minimum/src/Makefile

@@ -53,6 +53,10 @@ else
   CSRCS += stm32_userleds.c
 endif
 
+ifeq ($(CONFIG_ADC),y)
+CSRCS +=  stm32_adc.c
+endif
+
 ifeq ($(CONFIG_DEV_GPIO),y)
   CSRCS += stm32_gpio.c
 endif

configs/stm32f103-minimum/src/stm32_adc.c

@@ -0,0 +1,154 @@
+/************************************************************************************
+ * configs/stm32f103-minimum/src/stm32_adc.c
+ *
+ *   Copyright (C) 2017 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 <errno.h>
+#include <debug.h>
+
+#include <nuttx/board.h>
+#include <nuttx/analog/adc.h>
+#include <arch/board/board.h>
+
+#include "chip.h"
+#include "stm32_adc.h"
+#include "stm32f103_minimum.h"
+
+#ifdef CONFIG_ADC
+
+/************************************************************************************
+ * Pre-processor Definitions
+ ************************************************************************************/
+
+/* Configuration ********************************************************************/
+/* Up to 2 ADC interfaces are supported */
+
+#if STM32_NADC < 2
+#  undef CONFIG_STM32_ADC2
+#endif
+
+#if STM32_NADC < 1
+#  undef CONFIG_STM32_ADC1
+#endif
+
+#if defined(CONFIG_STM32_ADC1) || defined(CONFIG_STM32_ADC2)
+#ifndef CONFIG_STM32_ADC1
+#  warning "Channel information only available for ADC1"
+#endif
+
+/* The number of ADC channels in the conversion list */
+
+#define ADC1_NCHANNELS 1
+
+/************************************************************************************
+ * Private Data
+ ************************************************************************************/
+
+/* Identifying number of each ADC channel to be used with Variable Resistor (Pontentiometer)*/
+
+#ifdef CONFIG_STM32_ADC1
+static const uint8_t  g_chanlist[ADC1_NCHANNELS] = {0}; /* ADC12_IN0 */
+
+/* Configurations of pins used byte each ADC channels */
+
+static const uint32_t g_pinlist[ADC1_NCHANNELS]  = {GPIO_ADC12_IN0};
+#endif
+
+/************************************************************************************
+ * Public Functions
+ ************************************************************************************/
+
+/************************************************************************************
+ * Name: stm32_adc_setup
+ *
+ * Description:
+ *   Initialize ADC and register the ADC driver.
+ *
+ ************************************************************************************/
+
+int stm32_adc_setup(void)
+{
+#ifdef CONFIG_STM32_ADC1
+  static bool initialized = false;
+  struct adc_dev_s *adc;
+  int ret;
+  int i;
+
+  /* Check if we have already initialized */
+
+  if (!initialized)
+    {
+      /* Configure the pins as analog inputs for the selected channels */
+
+      for (i = 0; i < ADC1_NCHANNELS; i++)
+        {
+          stm32_configgpio(g_pinlist[i]);
+        }
+
+      /* Call stm32_adcinitialize() to get an instance of the ADC interface */
+
+      adc = stm32_adcinitialize(1, g_chanlist, ADC1_NCHANNELS);
+      if (adc == NULL)
+        {
+          aerr("ERROR: Failed to get ADC interface\n");
+          return -ENODEV;
+        }
+
+      /* Register the ADC driver at "/dev/adc0" */
+
+      ret = adc_register("/dev/adc0", adc);
+      if (ret < 0)
+        {
+          aerr("ERROR: adc_register failed: %d\n", ret);
+          return ret;
+        }
+
+      /* Now we are initialized */
+
+      initialized = true;
+    }
+
+  return OK;
+#else
+  return -ENOSYS;
+#endif
+}
+
+#endif /* CONFIG_STM32_ADC1 || CONFIG_STM32_ADC2 || CONFIG_STM32_ADC3 */
+#endif /* CONFIG_ADC */

configs/stm32f103-minimum/src/stm32_bringup.c

@@ -292,6 +292,16 @@ int stm32_bringup(void)
     }
 #endif
 
+#ifdef CONFIG_ADC
+  /* Initialize ADC and register the ADC driver. */
+
+  ret = stm32_adc_setup();
+  if (ret < 0)
+    {
+      syslog(LOG_ERR, "ERROR: stm32_adc_setup failed: %d\n", ret);
+    }
+#endif
+
 #if defined(CONFIG_WL_NRF24L01)
   /* Initialize the NRF24L01 wireless module */
 

configs/stm32f103-minimum/src/stm32f103_minimum.h

@@ -187,6 +187,18 @@ int stm32_bringup(void);
 int stm32_gpio_initialize(void);
 #endif
 
+/************************************************************************************
+ * Name: stm32_adc_setup
+ *
+ * Description:
+ *   Initialize ADC and register the ADC driver.
+ *
+ ************************************************************************************/
+
+#ifdef CONFIG_ADC
+int stm32_adc_setup(void);
+#endif
+
 /************************************************************************************
  * Name: stm32_spidev_initialize
  *