STM32F429 ADC采样，测试可以获取正确值

xhzheng 提问时间：2017-1-18 16:33 /

main.c
MX_ADC1_Init();
uhADCxConvertedValue=Get_Adc_Average(ADC_CHANNEL_10,20);

adc.c

/**
  ******************************************************************************
  * File Name       : ADC.c
  * Description       : This file provides code for the configuration
  *                   of the ADC instances.
  ******************************************************************************
  *
  * COPYRIGHT(c) 2016 STMicroelectronics
  *
  * 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 of STMicroelectronics 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 HOLDER 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.
  *
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "adc.h"

#include "gpio.h"

/* USER CODE BEGIN 0 */

/* USER CODE END 0 */

ADC_HandleTypeDef hadc1;
ADC_ChannelConfTypeDef sConfig;
/* ADC1 init function */
void MX_ADC1_Init(void)
{
  //ADC_ChannelConfTypeDef sConfig;

/**Configure the global features of the ADC (Clock, Resolution, Data Alignment and number of conversion)
*/
hadc1.Instance=ADC1;
hadc1.Init.ClockPrescaler=ADC_CLOCK_SYNC_PCLK_DIV4;
hadc1.Init.Resolution=ADC_RESOLUTION_12B;
hadc1.Init.DataAlign=ADC_DATAALIGN_RIGHT;
hadc1.Init.ScanConvMode=DISABLE;
hadc1.Init.EOCSelection=DISABLE;
hadc1.Init.ContinuousConvMode=DISABLE;
hadc1.Init.NbrOfConversion=1;
hadc1.Init.DiscontinuousConvMode=DISABLE;
hadc1.Init.NbrOfDiscConversion=0;
hadc1.Init.ExternalTrigConv=ADC_SOFTWARE_START;
hadc1.Init.ExternalTrigConvEdge=ADC_EXTERNALTRIGCONVEDGE_NONE;
hadc1.Init.DMAContinuousRequests=DISABLE;

  if (HAL_ADC_Init(&hadc1) != HAL_OK)
  {
Error_Handler();
  }

/**Configure for the selected ADC regular channel its corresponding rank in the sequencer and its sample time.
*/
  sConfig.Channel = ADC_CHANNEL_10;
  sConfig.Rank = 1;
  sConfig.SamplingTime = ADC_SAMPLETIME_3CYCLES;
sConfig.Offset    = 0;
  if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
  {
Error_Handler();
  }
}

void HAL_ADC_MspInit(ADC_HandleTypeDef* adcHandle)
{
GPIO_InitTypeDef       GPIO_InitStruct;
  if(adcHandle->Instance==ADC1)
  {
  /* USER CODE BEGIN ADC1_MspInit 0 */

  /* USER CODE END ADC1_MspInit 0 */
/* Peripheral clock enable */
__HAL_RCC_ADC1_CLK_ENABLE();
__HAL_RCC_GPIOC_CLK_ENABLE();

/**ADC1 GPIO Configuration
PC0    ------> ADC1_IN10
*/
GPIO_InitStruct.Pin = GPIO_PIN_0;
GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
GPIO_InitStruct.Pull = GPIO_NOPULL;
HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
  }
}

void HAL_ADC_MspDeInit(ADC_HandleTypeDef* adcHandle)
{
/*##-1- Reset peripherals ##################################################*/
  __HAL_RCC_ADC_FORCE_RESET();
  __HAL_RCC_ADC_RELEASE_RESET();

  /*##-2- Disable peripherals and GPIO Clocks ################################*/
  /* De-initialize the ADC Channel GPIO pin */
  HAL_GPIO_DeInit(GPIOC, GPIO_PIN_0);

}

/* USER CODE BEGIN 1 */

//ADC Value;
//ch: channel 0~16;
//return: adc single value;
double Get_Adc(uint32_t ch)
{
ADC_ChannelConfTypeDef ADC1_ChanConf;

ADC1_ChanConf.Channel=ch;
ADC1_ChanConf.Rank=1;
ADC1_ChanConf.SamplingTime=ADC_SAMPLETIME_480CYCLES;       //sampling time
ADC1_ChanConf.Offset=0;
HAL_ADC_ConfigChannel(&hadc1,&ADC1_ChanConf);

HAL_ADC_Start(&hadc1);                            //start adc

HAL_ADC_PollForConversion(&hadc1,10);

return (uint16_t)HAL_ADC_GetValue(&hadc1);
}

//Get ADC average value;
//times:sampling times;
//return: average value;
uint16_t Get_Adc_Average(uint32_t ch,uint8_t times)
{
uint32_t temp_val=0;
uint8_t t;
for(t=0;t<times;t++)
{
temp_val+=Get_Adc(ch);
//delay_ms(5);
HAL_Delay(5);
}
return temp_val/times;
}

/* USER CODE END 1 */

/**
  * @}
  */

/**
  * @}
  */

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/