text: /*******************************************************************************
   * boards/arm/stm32l4/nucleo-l432kc/src/stm32_adc.c
   *
   *   Copyright (C) 2014, 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 <errno.h>
  #include <debug.h>
  
  #include <nuttx/board.h>
  #include <nuttx/analog/adc.h>
  #include <arch/board/board.h>
  
  #include "chip.h"
  #include "up_arch.h"
  
  #include "stm32l4_adc.h"
  #include "nucleo-l432kc.h"
  
  #ifdef CONFIG_STM32L4_ADC1
  
  /*******************************************************************************
   * Pre-processor Definitions
   ******************************************************************************/
  
  /* The number of ADC channels in the conversion list */
  
  #ifdef CONFIG_STM32L4_ADC1_DMA
  #  define ADC1_NCHANNELS 2
  #else
  #  define ADC1_NCHANNELS 1
  #endif
  
  /*******************************************************************************
   * Private Data
   ******************************************************************************/
  /* Identifying number of each ADC channel. */
  
  #ifdef CONFIG_STM32L4_ADC1_DMA
  
  static const uint8_t  g_adc1_chanlist[ADC1_NCHANNELS] = {11, 12};
  
  /* Configurations of pins used byte each ADC channels */
  
  static const uint32_t g_adc1_pinlist[ADC1_NCHANNELS]  =
  {
    GPIO_ADC1_IN11, GPIO_ADC1_IN12
  };
  
  #else
  /* Without DMA, only a single channel can be supported */
  
  static const uint8_t  g_adc1_chanlist[ADC1_NCHANNELS] = {11};
  
  /* Configurations of pins used byte each ADC channels */
  
  static const uint32_t g_adc1_pinlist[ADC1_NCHANNELS]  = {GPIO_ADC1_IN11};
  
  #endif /* CONFIG_STM32L4_ADC1_DMA */
  
  /*******************************************************************************
   * Private Functions
   ******************************************************************************/
  
  /*******************************************************************************
   * Public Functions
   ******************************************************************************/
  
  /*******************************************************************************
   * Name: stm32l4_adc_setup
   *
   * Description:
   *   Initialize ADC and register the ADC driver.
   *
   ******************************************************************************/
  
  int stm32l4_adc_setup(void)
  {
    struct adc_dev_s *adc;
    int ret;
    int i;
  
    /* Configure the pins as analog inputs for the selected channels */
  
    for (i = 0; i < ADC1_NCHANNELS; i++)
      {
        stm32l4_configgpio(g_adc1_pinlist[i]);
      }
  
    /* Call stm32l4_adc_initialize() to get an instance of the ADC interface */
  
    adc = stm32l4_adc_initialize(1, g_adc1_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;
      }
  
    return OK;
  }
  
  #endif /* CONFIG_STM32L4_ADC1 */
  