STM32F051 不能实现定时采集一路ADC电压值

张衍波 · 发表于 2015-6-14 17:04:00

我想通过通用定时2实现1KHZ的ADC采样。让定时器去驱动ADC采集（1ms一次），采集到的数据在通过DMA送到内存，当用数据传送的时候进入DMA中断，最终现象是定时器1ms中断正常。但是DMA中断就不正常了差不多20us就进入一次。搞不懂是不是那里配置错了。请各位帮一下忙看看
#include "adc.h"
#include "stm32f0xx.h"

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define ADC1_DR_Address             0x40012440
__IO uint16_t RegularConvData_Tab;

void ADC_Timer_Init()
{
TIM_TimeBaseInitTypeDef timer_init_structure;
NVIC_InitTypeDef nvic_init_structure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);          //????TIM2?±??

nvic_init_structure.NVIC_IRQChannel = TIM2_IRQn;             //????TIM2?????¨??
nvic_init_structure.NVIC_IRQChannelCmd = ENABLE;             //????TIM2????
nvic_init_structure.NVIC_IRQChannelPriority = 0;             //????????0
NVIC_Init(&nvic_init_structure);

TIM_DeInit(TIM2);                                              //????TIM2
TIM_TimeBaseStructInit(&timer_init_structure);                //??????TIMBASE?á????

timer_init_structure.TIM_ClockDivision = TIM_CKD_DIV1;       //?????±??????·?????48M
timer_init_structure.TIM_CounterMode = TIM_CounterMode_Up;    //?ò??????????
timer_init_structure.TIM_Period = 1000;                         //??1ms??·???????????????ADC
timer_init_structure.TIM_Prescaler = 48-1;                   //?????±???¤·?????f??1M??systick??1 uS
timer_init_structure.TIM_RepetitionCounter = 0x00;             //·??ú0+1??update?????ú?ú????
TIM_TimeBaseInit(TIM2, &timer_init_structure);

TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);                   //????TIM2????
TIM_SelectOutputTrigger(TIM2, TIM_TRGOSource_Update);          //????TIM2??update?????ü??????·???

TIM_Cmd(TIM2, ENABLE);                                        //????TIM2
}

void ADC1_DMA_Init(void)
{
  ADC_InitTypeDef    ADC_InitStruct;
  DMA_InitTypeDef    DMA_InitStruct;
      GPIO_InitTypeDef GPIO_InitStruct;
      NVIC_InitTypeDef NVIC_InitStruct;
      /* ADC1 DeInit */
  ADC_DeInit(ADC1);

      /* Enable  GPIOA clock */
      RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
  /* ADC1 Periph clock enable */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
  /* DMA1 clock enable */
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1 , ENABLE);

  /* Configure PA.00  as analog input */
  GPIO_InitStruct.GPIO_Pin = GPIO_Pin_0;
  GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AN;
      GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL ;
      GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;             //Fast speed
  GPIO_Init(GPIOA, &GPIO_InitStruct);                               //

      NVIC_InitStruct.NVIC_IRQChannel = DMA1_Channel1_IRQn ;
      NVIC_InitStruct.NVIC_IRQChannelPriority = 0x1;
      NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;
      NVIC_Init(&NVIC_InitStruct);

  /* DMA1 Channel1 Config */
  DMA_DeInit(DMA1_Channel1);
  DMA_InitStruct.DMA_PeripheralBaseAddr = (uint32_t)ADC1_DR_Address;
  DMA_InitStruct.DMA_MemoryBaseAddr = (uint32_t)&RegularConvData_Tab;
  DMA_InitStruct.DMA_DIR = DMA_DIR_PeripheralSRC;
  DMA_InitStruct.DMA_BufferSize =4;
  DMA_InitStruct.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
  DMA_InitStruct.DMA_MemoryInc = DMA_MemoryInc_Disable ;//??????·?????
  DMA_InitStruct.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
  DMA_InitStruct.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
  DMA_InitStruct.DMA_Mode = DMA_Mode_Circular;
  DMA_InitStruct.DMA_Priority = DMA_Priority_High;
  DMA_InitStruct.DMA_M2M = DMA_M2M_Disable;
  DMA_Init(DMA1_Channel1, &DMA_InitStruct);

DMA_ITConfig(DMA1_Channel1,DMA_IT_TC,ENABLE);//?????á???§???????è????????°?????????
            DMA_ClearITPendingBit(DMA_IT_TC);          //??????????????

  /* DMA1 Channel1 enable */
  DMA_Cmd(DMA1_Channel1, ENABLE);

// /* ADC DMA request in circular mode */
  ADC_DMARequestModeConfig(ADC1, ADC_DMAMode_Circular);

  /* Enable ADC_DMA */
  ADC_DMACmd(ADC1, ENABLE);

  /* Initialize ADC structure */
  ADC_StructInit(&ADC_InitStruct);

  /* Configure the ADC1 in continous mode withe a resolutuion equal to 12 bits  */
  ADC_InitStruct.ADC_Resolution = ADC_Resolution_12b;

      ADC_InitStruct.ADC_ContinuousConvMode = ENABLE;
  ADC_InitStruct.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConv_T2_TRGO; //??????·??è????TIM2
  ADC_InitStruct.ADC_DataAlign = ADC_DataAlign_Right;
  ADC_InitStruct.ADC_ScanDirection = ADC_ScanDirection_Backward;

  ADC_Init(ADC1, &ADC_InitStruct);

// /* Convert the ADC1 temperature sensor  with 55.5 Cycles as sampling time */
// ADC_ChannelConfig(ADC1, ADC_Channel_TempSensor , ADC_SampleTime_55_5Cycles);
// ADC_TempSensorCmd(ENABLE);

  /* Convert the ADC1 Vref  with 55.5 Cycles as sampling time */
  ADC_ChannelConfig(ADC1, ADC_Channel_0  , ADC_SampleTime_55_5Cycles);
ADC_VrefintCmd(ENABLE);

  /* ADC Calibration */
  ADC_GetCalibrationFactor(ADC1);

ADC_DMACmd(ADC1, ENABLE);

//ADC_ITConfig(ADC1, ADC_IT_EOC ,ENABLE);

  /* Enable ADC1 */
  ADC_Cmd(ADC1, ENABLE);

  /* Wait the ADCEN falg */
  while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_ADEN));

  /* ADC1 regular Software Start Conv */
  ADC_StartOfConversion(ADC1);
      ADC_Timer_Init();
}
/////////////////////下面是中断的代码/////////////////////////////////////
      void TIM2_IRQHandler()
      {
            if(TIM_GetITStatus(TIM2, TIM_IT_Update))                      //????·??úupdate????????
            {
                     TIM_ClearITPendingBit(TIM2, TIM_IT_Update);       //????update????????±ê??
            }
      }
#include "hal_led.h"
      void DMA1_Channel1_IRQHandler(void){
            static uint8_t ff ;
      if(DMA_GetITStatus(DMA1_IT_TC1))
      {
            if(ff == 0){
            GPIO_SetBits(LED1_PORT, LED1_PIN );
                     ff = 1 ;
            }else{
            GPIO_ResetBits(LED1_PORT, LED1_PIN );
                     ff = 0 ;
            }

      }
      DMA_ClearITPendingBit(DMA1_IT_GL1); //???????????ù??????
      }

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