text: /****************************************************************************
   * boards/arm/stm32/nucleo-f334r8/src/stm32_adc.c
   *
   *   Copyright (C) 2017 Gregory Nutt. All rights reserved.
   *   Author: Mateusz Szafoni <raiden00@railab.me>
   *
   * 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 <stdbool.h>
  #include <errno.h>
  #include <debug.h>
  
  #include <nuttx/board.h>
  #include <nuttx/analog/adc.h>
  
  #include "stm32.h"
  
  #if defined(CONFIG_ADC) && (defined(CONFIG_STM32_ADC1) || defined(CONFIG_STM32_ADC2))
  
  /****************************************************************************
   * Pre-processor Definitions
   ****************************************************************************/
  
  /* Configuration ************************************************************/
  
  /* 1 or 2 ADC devices (DEV1, DEV2) */
  
  #if defined(CONFIG_STM32_ADC1)
  #  define DEV1_PORT 1
  #endif
  
  #if defined(CONFIG_STM32_ADC2)
  #  if defined(DEV1_PORT)
  #    define DEV2_PORT 2
  #  else
  #    define DEV1_PORT 2
  #  endif
  #endif
  
  /* The number of ADC channels in the conversion list */
  /* TODO DMA */
  
  #define ADC1_NCHANNELS 3
  #define ADC2_NCHANNELS 3
  
  /****************************************************************************
   * Private Function Prototypes
   ****************************************************************************/
  
  /****************************************************************************
   * Private Data
   ****************************************************************************/
  
  /* DEV 1 */
  
  #if DEV1_PORT == 1
  
  #define DEV1_NCHANNELS ADC1_NCHANNELS
  
  /* Identifying number of each ADC channel (even if NCHANNELS is less ) */
  
  static const uint8_t g_chanlist1[3] =
  {
    1,
    2,
    11
  };
  
  /* Configurations of pins used by each ADC channel */
  
  static const uint32_t g_pinlist1[3]  =
  {
    GPIO_ADC1_IN1,                /* PA0/A0 */
    GPIO_ADC1_IN2,                /* PA1/A1 */
    GPIO_ADC1_IN11,               /* PB0/A3 */
  };
  
  #elif DEV1_PORT == 2
  
  #define DEV1_NCHANNELS ADC2_NCHANNELS
  
  /* Identifying number of each ADC channel */
  
  static const uint8_t g_chanlist1[3] =
  {
    1,
    6,
    7
  };
  
  /* Configurations of pins used by each ADC channel */
  
  static const uint32_t g_pinlist1[3] =
  {
    GPIO_ADC2_IN1,                /* PA4/A2 */
    GPIO_ADC2_IN7,                /* PC1/A4 */
    GPIO_ADC2_IN6,                /* PC0/A5 */
  };
  
  #endif /* DEV1_PORT == 1 */
  
  #ifdef DEV2_PORT
  
  /* DEV 2 */
  
  #if DEV2_PORT == 2
  
  #define DEV2_NCHANNELS ADC2_NCHANNELS
  
  /* Identifying number of each ADC channel */
  
  static const uint8_t g_chanlist2[3] =
  {
    1,
    6,
    7
  };
  
  /* Configurations of pins used by each ADC channel */
  
  static const uint32_t g_pinlist2[3] =
  {
    GPIO_ADC2_IN1,                /* PA4/A2 */
    GPIO_ADC2_IN7,                /* PC1/A4 */
    GPIO_ADC2_IN6,                /* PC0/A5 */
  };
  
  #endif /* DEV2_PORT == 2 */
  #endif /* DEV2_PORT */
  
  /****************************************************************************
   * Private Functions
   ****************************************************************************/
  
  /****************************************************************************
   * Public Functions
   ****************************************************************************/
  
  /****************************************************************************
   * Name: stm32_adc_setup
   *
   * Description:
   *   Initialize ADC and register the ADC driver.
   *
   ****************************************************************************/
  
  int stm32_adc_setup(void)
  {
    static bool initialized = false;
    FAR struct adc_dev_s *adc;
    int ret;
    int i;
  
    /* Check if we have already initialized */
  
    if (!initialized)
      {
        /* DEV1 */
        /* Configure the pins as analog inputs for the selected channels */
  
        for (i = 0; i < DEV1_NCHANNELS; i++)
          {
            stm32_configgpio(g_pinlist1[i]);
          }
  
        /* Call stm32_adcinitialize() to get an instance of the ADC interface */
  
        adc = stm32_adcinitialize(DEV1_PORT, g_chanlist1, DEV1_NCHANNELS);
        if (adc == NULL)
          {
            aerr("ERROR: Failed to get ADC interface 1\n");
            return -ENODEV;
          }
  
        /* Register the ADC driver at "/dev/adc0" */
  
        ret = adc_register("/dev/adc0", adc);
        if (ret < 0)
          {
            aerr("ERROR: adc_register /dev/adc0 failed: %d\n", ret);
            return ret;
          }
  
  #ifdef DEV2_PORT
  
        /* DEV2 */
        /* Configure the pins as analog inputs for the selected channels */
  
        for (i = 0; i < DEV2_NCHANNELS; i++)
          {
            stm32_configgpio(g_pinlist2[i]);
          }
  
        /* Call stm32_adcinitialize() to get an instance of the ADC interface */
  
        adc = stm32_adcinitialize(DEV2_PORT, g_chanlist2, DEV2_NCHANNELS);
        if (adc == NULL)
          {
            aerr("ERROR: Failed to get ADC interface 2\n");
            return -ENODEV;
          }
  
        /* Register the ADC driver at "/dev/adc1" */
  
        ret = adc_register("/dev/adc1", adc);
        if (ret < 0)
          {
            aerr("ERROR: adc_register /dev/adc1 failed: %d\n", ret);
            return ret;
          }
  #endif
  
        initialized = true;
  
      }
  
    return OK;
  }
  
  #endif /* CONFIG_ADC && (CONFIG_STM32_ADC1 || CONFIG_STM32_ADC2) */
  