STM32

关于使用STM32F4定时器触发内部AD采集的问题

2019-07-14 22:23发布

站内问答 / STM32/STM8
5312 0 1010
我想通过定时器2，控制内部AD进行64点采样，感觉AD,定时器，DMA都已经配置好了，但是不知道什么原因总是读不出数据。（如果不适用定时器触发，可以通过串口读出AD采样结果），附上代码还请高手帮忙解答，谢谢。
void timer2_Configuration(void)
{
        TIM_TimeBaseInitTypeDef  TIM2_TimeBaseStructure;
        TIM_OCInitTypeDef TIM2_OCInitStructure;
       
        TIM_DeInit(TIM2);  
        RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE);
        TIM_TimeBaseStructInit(&TIM2_TimeBaseStructure)
        TIM2_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1
        TIM2_TimeBaseStructure.TIM_Prescaler = 42-1;
        TIM2_TimeBaseStructure.TIM_Period = 625-1;
         TIM2_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
         TIM_TimeBaseInit(TIM2,&TIM2_TimeBaseStructure);       
       
        TIM_SelectOutputTrigger(TIM2,TIM_TRGOSource_Update)
////////////////////////////////////////////////////////////////////
        TIM2_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1；
        TIM2_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable
        TIM2_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low
        TIM2_OCInitStructure.TIM_Pulse = CCR
       
        TIM_OC2Init(TIM2, & TIM2_OCInitStructure);
        TIM_OC2PreloadConfig(TIM2,TIM_OCPreload_Enable)
        TIM_ARRPreloadConfig(TIM2,ENABLE);                               
        TIM_Cmd(TIM2,ENABLE);                                                                                       
////////////////////////////////////////////////////////////////////////////////       
//        TIM_Cmd(TIM2,ENABLE);        //ÔÚÆô¶¯¶¨Ê±Æ÷º¯ÊýÀïÃæʹÄÜTIM2
//        TIM_InternalClockConfig(TIM2);//ÉèÖÃTIM2ÄÚ²¿Ê±ÖÓ
//        TIM_UpdateDisableConfig(TIM2,ENABLE);//ʧÄÜTIM2¸üÐÂʼþ
//        TIM_SelectOutputTrigger(TIM2,TIM_TRGOSource_Update);
        TIM_ITConfig(TIM2,TIM_IT_Update,ENABLE);                                                        
}

void ADC_IO_Configuration(void)
{
        GPIO_InitTypeDef GPIO_InitStructure;
       
        RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);  
        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;        /*Ñ¡ÔñÒª¿ØÖƵÄGPIOAÒý½Å*/               
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN; /*ÉèÖÃÒý½ÅģʽΪģÄâÊäÈë*/  

  GPIO_Init(GPIOA, &GPIO_InitStructure);/*µ÷Óÿ⺯Êý£¬³õʼ»¯GPIOA*/               
}
void ADC1_Mode_Configuration(void)
{       
        DMA_InitTypeDef DMA_InitStructure;
        NVIC_InitTypeDef NVIC_InitStructure;
        ADC_InitTypeDef ADC_InitStructure;
       
        RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);  
        DMA_DeInit(DMA2_Stream0);//³õʼ»¯¸÷¼Ä´æÆ÷ÅäÖÃ
        DMA_StructInit( &DMA_InitStructure);
        /* DMA2 Stream0 channel0 configuration **************************************/
        //Ñ¡È¡DMAͨµÀ0.Êý¾ÝÁ÷0
        DMA_InitStructure.DMA_Channel = DMA_Channel_0;   
        //ADCµØÖ·
  DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC1_DR_Address;  
        //ÄÚ´æµØÖ·
        DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&ADC_ConvertedValue;
  //·½Ïò ´ÓÄÚ´æµ½ÍâÉè.ÍâÉèÊÇÊý¾ÝÔ´
        DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;   
        //Êý¾Ý»º³åÇø
        DMA_InitStructure.DMA_BufferSize = 1000;  
        //ÍâÉèµØÖ·²»Ôö
        DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;  
        //ÄÚ´æµØÖ·Ôö¼Ó
        DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;   //DMA_MemoryInc_Enable DMA_MemoryInc_Disable
        //Êý¾ÝÀàÐÍΪ°ë×Ö
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; //ÍâÉèÊý¾Ýµ¥Î»  
        DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord; //ÄÚ´æÊý¾Ýµ¥Î»£º8b
       
        DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; //DMAģʽ£ºÑ­»·´«Êä
  DMA_InitStructure.DMA_Priority = DMA_Priority_High; //ÓÅÏȼ¶£ºÖÐ
        //²»Ê¹ÓÃFIFOģʽ
        DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;    //
        DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;  //
        DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;  //
        DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
        //½«ÒÔÉÏÉèÖÃÓ¦ÓÃÓÚDMA2£¬Í¨µÀ0£¬Êý¾ÝÁ÷0
  DMA_Init(DMA2_Stream0, &DMA_InitStructure);
        //ʹÄÜDMA
        DMA_Cmd(DMA2_Stream0, ENABLE);
       
       
       
        //Ñ¡ÔñDMA2ͨµÀÊý¾ÝÁ÷0
        NVIC_InitStructure.NVIC_IRQChannel=DMA2_Stream0_IRQn;//DMA2_Stream0_IRQHandler;
        //ÇÀÕ¼ÓÅÏȼ¶0
        NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=1;
        //ÏìÓ¦ÓÅÏȼ¶
        NVIC_InitStructure.NVIC_IRQChannelSubPriority=4;
        //ͨµÀʹÄÜ
        NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
        //½«ÒÔÉÏÅäÖÃÓ¦ÓÃÓÚNVIC
        NVIC_Init(&NVIC_InitStructure);
        //ʹÄÜDMA´«ÊäÍê³ÉÖжÏ
        DMA_ITConfig(DMA2_Stream0,DMA_IT_TC,ENABLE);

       
        /*        -----------------------------------------------------------------------
        ADCת»»Ê±¼ä:T = T1+T2 = 0.7us + 0.24us = 0.94us¡£´óÔ¼ÊÇ1us,ת»»ËÙÂʵÈÓÚ£º1M
        -----------------------------------------------------------------------*/       
        RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE); //ADC1ʹÓÃAPB2ʱÖÓ£ºHCLK2 = 84M¡£
        ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;    //ÉèÖÃ12λ·Ö±æÂÊ
        ADC_InitStructure.ADC_ScanConvMode = DISABLE;   //µ¥Í¨µÀ£º¹Ø±ÕɨÃèģʽ
        ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;      //Á¬ÐøģʽENABLE,¹Ø±ÕÑ­»·Ä£Ê½£¬²ÉÓö¨Ê±Æ÷´¥·¢
        ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_Rising;   //ÉÏÉýÑØ´¥·¢
        ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T2_TRGO;//TIMÒç³ö´¥·¢¡£ADC_ExternalTrigConv_T2_CC2;ADC_ExternalTrigConv_T2_TRGO
        ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;         //Êý¾ÝÓÒ¶ÔÆëģʽ
        ADC_InitStructure.ADC_NbrOfConversion = 1;  //ÉèÖÃADCת»»Í¨µÀÊý
        ADC_Init(ADC1,&ADC_InitStructure);

        //ʹÄÜADC1µÄÔÚDMAģʽÏÂÁ¬Ðøת»»
        ADC_DMARequestAfterLastTransferCmd(ADC1,ENABLE);
        ADC_DMACmd(ADC1, ENABLE);
        /* ADC3 regular channel2 configuration £º*/  
        ADC_RegularChannelConfig(ADC1, ADC_Channel_2, 1, ADC_SampleTime_3Cycles); //ÅäÖùæÔò×飬µÃ³öµ¥´Î×¥»»Ê±¼ä:T1 = (3+12)/21 = 0.7us
        /* Enable ADC1 DMA */  
  ADC_Cmd(ADC1,ENABLE);
        ADC_ExternalTrigInjectedConvConfig(ADC1, TIM_TRGOSource_Update);//TIM_CC1
//        ADTIM_SelectOutputTrigger(TIM3, TIM_TRGOSource_Update);
//  ADC_ExternalTrigConvCmd(ADC1, ENABLE);


}
void ADC1_Com_Configuration(void)
{
        ADC_CommonInitTypeDef ADC_CommonInitStructure;
       
        ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;//¶ÀÁ¢Ä£Ê½
/*        ---------------------------------------------------------------------
        STM32F439ÊÖ²á153Ò³£ºVDDAÔÚ2.4µ½3.6VÖ®¼äʱ£¬×¥»»ÆµÂÊ×î´ó36M£¬Îȶ¨ÊÇ30M¡£
        ---------------------------------------------------------------------*/
        ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div4;  //×¥»»ÆµÂÊ = HCLK2 / ADC_Prescaler_Div4 = 21M¡£
        //ʹÓÃADCµÄDMA¸´ÓÃ
        ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_2;//ADC_DMAAccessMode_2 ADC_DMAAccessMode_Disabled
  //Á½´Î×¥»»¼ä¸ôʱ¼äΪ5¸öADCʱÖÓÖÜÆÚ:T2 = 5/21 = 0.24us      
        ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
        //½«ÒÔÉÏÅäÖÃÓ¦ÓÃÓÚADC_CommonInitStructure
        ADC_CommonInit(&ADC_CommonInitStructure);
}
采集不出来数据，还请有高手指点。扣扣：1849962273

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