关于STM32F405中ADC单通道采样 DAC+DMA产生正弦信号 ADC+DMA高频采样

STM32F405功能优势

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1、主频最高可达168MHz

2、3个12位AD，最高转换速度可达2.4MSPS

3、最高可达24通道，3通道同步采样可达7.2MSPS

DAC+DMA产生正弦信号程序配置

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采用DMA循环传输模式，触发源为TIM2的 DAC_Trigger_T2_TRGO

本程序采用20个数据，2M的转换频率，产生100KHz的正弦信号

const uint16_t Sine12bit[20] =

{  2681,3252,3705,3996,4095,3996,3705,3252,2681,

 2048,1415,844 ,391,100, 0,100, 391 , 844, 1415,2048};

void GPIO_Configuration(void)

{     

    GPIO_InitTypeDef GPIO_InitStructure;   

     /* Enable peripheral clocks ------------------------------------------------*/   

     /* GPIOA Periph clock enable */     

    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);    

    /* GPIOC Periph clock enable */  

     RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);

    /* DAC channel 1 & 2 (DAC_OUT1 = PA.4)(DAC_OUT2 = PA.5) configuration */   

     GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_5;   

     GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;   

     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;    

     GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;    

     GPIO_Init(GPIOA, &GPIO_InitStructure);

}

void DAC_Configuration(void)

{    

    DAC_InitTypeDef DAC_InitStructure;

    /* DAC Periph clock enable */     

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE);

    /* DAC channel1 Configuration */     

    DAC_InitStructure.DAC_Trigger = DAC_Trigger_T2_TRGO;    

    DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None;  

    DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Disable;     

    DAC_Init(DAC_Channel_1, &DAC_InitStructure);

     /* Enable DAC Channel1: Once the DAC channel1 is enabled, PA.04 is  

    automatically connected to the DAC converter. */    

    DAC_Cmd(DAC_Channel_1, ENABLE)