nuttx/boards/arm/stm32/nucleo-f302r8/src/stm32_adc.c at 7bc9a4ff0724d0b8806530a6eed9ed132416eb67 · raiden00pl/nuttx · GitHub

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/****************************************************************************
 * boards/arm/stm32/nucleo-f302r8/src/stm32_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 <nuttx/debug.h>

#include <nuttx/analog/adc.h>

#include "stm32.h"

/****************************************************************************
 * Pre-processor Definitions
 ****************************************************************************/

#ifndef CONFIG_STM32_ADC1
#  error ADC1 support must be enabled
#endif

#ifndef CONFIG_STM32_ADC1_DMA
#  error ADC1 DMA support must be enabled
#endif

#define ADC1_NCHANNELS 4

/****************************************************************************
 * Private Data
 ****************************************************************************/

/* Use CN8 pins 35, 36, 37 and 38 */

static const uint8_t  g_adc1_chanlist[ADC1_NCHANNELS] =
{
  6, 7, 8, 9
};

static const uint32_t g_adc1_pinlist[ADC1_NCHANNELS]  =
{
  GPIO_ADC1_IN6_0,                /* PC0 */
  GPIO_ADC1_IN7_0,                /* PC1 */
  GPIO_ADC1_IN8_0,                /* PC2 */
  GPIO_ADC1_IN9_0,                /* PC3 */
};

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Name: stm32_adc_setup
 *
 * Description:
 *   Initialize ADC and register the ADC driver.
 *
 ****************************************************************************/

int stm32_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++)
    {
      stm32_configgpio(g_adc1_pinlist[i]);
    }

  /* Call stm32_adcinitialize() to get an instance of the ADC interface */

  adc = stm32_adcinitialize(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;
}